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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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How to Apply These Terms to Your New Programs
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For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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# Fish Fight Back
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[![Donate via Patreon](https://img.shields.io/badge/dynamic/json?color=%23e85b46&label=Patreon&query=data.attributes.patron_count&suffix=%20patrons&url=https%3A%2F%2Fwww.patreon.com%2Fapi%2Fcampaigns%2F5252223)](https://www.patreon.com/rocketnine)
[Bullet hell](https://en.wikipedia.org/wiki/Shoot_%27em_up#Bullet_hell) video game featuring fishy revenge
This game was created for the [Mini Jam 108](https://itch.io/jam/mini-jam-108-seaside) game jam.
## Play
### Browser
[**Play in your browser**](https://rocketnine.itch.io/fishfightback)
### Compile
**Note:** The following assets are required to compile Fish Fight Back:
- [Cozy Fishing](https://shubibubi.itch.io/cozy-fishing) at `/asset/image/cozy-fishing/`
- [Cozy People](https://shubibubi.itch.io/cozy-people) at `/asset/image/cozy-people/`
These assets are not free, and are not included in this repository.
Install the dependencies listed for [your platform](https://github.com/hajimehoshi/ebiten/blob/main/README.md#platforms),
then run the following command:
`go install code.rocketnine.space/tslocum/fishfightback@latest`
Run `~/go/bin/fishfightback` to play.
## Support
Please share issues and suggestions [here](https://code.rocketnine.space/tslocum/fishfightback/issues).
## Credits
- [Trevor Slocum](https://rocketnine.space) - Game design and programming
- [node punk](https://open.spotify.com/artist/15eFpWQPNRxB89PnFNWvjU?si=z-jfVwYHTxugaC-BGZiyNg) - Music
## Dependencies
- [ebiten](https://github.com/hajimehoshi/ebiten) - Game engine
- [gohan](https://code.rocketnine.space/tslocum/gohan) - Entity Component System framework

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asset/asset.go Normal file
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package asset
import (
"bytes"
"embed"
"image"
"image/color"
_ "image/png"
"io"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/audio"
"github.com/hajimehoshi/ebiten/v2/audio/vorbis"
"github.com/hajimehoshi/ebiten/v2/audio/wav"
)
const sampleRate = 44100
//go:embed image
var FS embed.FS
var ImgWhiteSquare = ebiten.NewImage(8, 8)
var ImgBlackSquare = ebiten.NewImage(8, 8)
var (
ImgBat = FishImage(7)
ImgBatBroken1 = FishTileAt(1)
ImgBatBroken2 = FishTileAt(2)
ImgWater = newWaterImage()
ImgFish = LoadImage("image/cozy-fishing/global.png")
ImgFishParrot = FishImage(1)
ImgFishMackarel = FishImage(2)
ImgFishClown = FishImage(3)
ImgFishPlaice = FishImage(4)
)
func init() {
ImgWhiteSquare.Fill(color.White)
ImgBlackSquare.Fill(color.Black)
}
func newWaterImage() *ebiten.Image {
img := ebiten.NewImage(16, 16)
img.Fill(color.RGBA{96, 160, 168, 255})
return img
}
func LoadSounds(ctx *audio.Context) {
// TODO
}
func LoadImage(p string) *ebiten.Image {
f, err := FS.Open(p)
if err != nil {
panic(err)
}
defer f.Close()
baseImg, _, err := image.Decode(f)
if err != nil {
panic(err)
}
return ebiten.NewImageFromImage(baseImg)
}
func LoadBytes(p string) []byte {
b, err := FS.ReadFile(p)
if err != nil {
panic(err)
}
return b
}
func LoadWAV(context *audio.Context, p string) *audio.Player {
f, err := FS.Open(p)
if err != nil {
panic(err)
}
defer f.Close()
stream, err := wav.DecodeWithSampleRate(sampleRate, f)
if err != nil {
panic(err)
}
player, err := context.NewPlayer(stream)
if err != nil {
panic(err)
}
// Workaround to prevent delays when playing for the first time.
player.SetVolume(0)
player.Play()
player.Pause()
player.Rewind()
player.SetVolume(1)
return player
}
func LoadOGG(context *audio.Context, p string, loop bool) *audio.Player {
b := LoadBytes(p)
stream, err := vorbis.DecodeWithSampleRate(sampleRate, bytes.NewReader(b))
if err != nil {
panic(err)
}
var s io.Reader
if loop {
s = audio.NewInfiniteLoop(stream, stream.Length())
} else {
s = stream
}
player, err := context.NewPlayer(s)
if err != nil {
panic(err)
}
// Workaround to prevent delays when playing for the first time.
player.SetVolume(0)
player.Play()
player.Pause()
player.Rewind()
player.SetVolume(1)
return player
}
func FishTileAt(i int) *ebiten.Image {
const tileSize = 16
const tilesetWidth = 56
x, y := i%tilesetWidth, i/tilesetWidth
r := image.Rect(x*tileSize, y*tileSize, (x+1)*tileSize, (y+1)*tileSize)
return ImgFish.SubImage(r).(*ebiten.Image)
}
func FishTileXY(x, y int) *ebiten.Image {
const tileSize = 16
const tilesetWidth = 56
r := image.Rect(x*tileSize, y*tileSize, (x+1)*tileSize, (y+1)*tileSize)
return ImgFish.SubImage(r).(*ebiten.Image)
}
func FishImage(i int) *ebiten.Image {
const tileSize = 16
const fishTilesetWidth = 10
x, y := i%fishTilesetWidth, i/fishTilesetWidth
x += 46
r := image.Rect(x*tileSize, y*tileSize, (x+1)*tileSize, (y+1)*tileSize)
return ImgFish.SubImage(r).(*ebiten.Image)
}

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component/creep.go Normal file
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package component
import (
"math/rand"
)
type Creep struct {
Type int
Active bool
Health int
FireAmount int
FireRate int // In ticks
FireTicks int //Ticks until next action
Movement int
Movements [][3]float64 // X, Y, pre-delay in ticks
MovementTicks int // Ticks until next action
DamageTicks int
Rand *rand.Rand
}
const (
CreepSnowblower = iota + 1
CreepSmallRock
CreepMediumRock
CreepLargeRock
)

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package component
type CreepBullet struct {
Invulnerable bool // Invulnerable to hazards
}

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package component
type PlayerBullet struct {
}

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component/position.go Normal file
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package component
type Position struct {
X, Y float64
Z int
}

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component/rail.go Normal file
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package component
// Rail is a component added to all entities which should move along the rail with the camera.
type Rail struct {
}

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component/sprite.go Normal file
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package component
import (
"time"
"github.com/hajimehoshi/ebiten/v2"
)
type Sprite struct {
Image *ebiten.Image
HorizontalFlip bool
VerticalFlip bool
DiagonalFlip bool // TODO unimplemented
Angle float64
Overlay *ebiten.Image
OverlayX, OverlayY float64 // Overlay offset
Frame int
Frames []*ebiten.Image
FrameTime time.Duration
LastFrame time.Time
NumFrames int
DamageTicks int
OverrideColorScale bool
ColorScale float64
}

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component/velocity.go Normal file
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package component
type Velocity struct {
X, Y float64
}

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component/weapon.go Normal file
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package component
type Weapon struct {
Equipped bool
Damage int
// In ticks
FireRate int
NextFire int
BulletSpeed float64
}

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entity/creep.go Normal file
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package entity
import (
"math/rand"
"sync"
"code.rocketnine.space/tslocum/fishfightback/asset"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/level"
"code.rocketnine.space/tslocum/gohan"
)
var newestCreepID int64
var creepIDLock sync.Mutex
func newCreepID() int64 {
creepIDLock.Lock()
defer creepIDLock.Unlock()
newestCreepID++
return newestCreepID
}
func NewCreep(creepType int, x, y float64) gohan.Entity {
creepID := newCreepID()
creep := gohan.NewEntity()
creep.AddComponent(&component.Position{
X: x,
Y: y,
Z: level.LayerCreep,
})
creep.AddComponent(&component.Sprite{
Image: asset.ImgBat,
})
creep.AddComponent(&component.Rail{})
creep.AddComponent(&component.Creep{
Type: creepType,
Health: 32,
FireAmount: 2,
FireRate: 144 * 1,
Rand: rand.New(rand.NewSource(creepID)),
})
return creep
}

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entity/creepbullet.go Normal file
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package entity
import (
"code.rocketnine.space/tslocum/fishfightback/asset"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/level"
"code.rocketnine.space/tslocum/gohan"
)
func NewCreepBullet(x, y, xSpeed, ySpeed float64) gohan.Entity {
bullet := gohan.NewEntity()
bullet.AddComponent(&component.Position{
X: x,
Y: y,
Z: level.LayerBullet,
})
bullet.AddComponent(&component.Velocity{
X: xSpeed,
Y: ySpeed,
})
bullet.AddComponent(&component.Sprite{
Image: asset.ImgWhiteSquare,
})
bullet.AddComponent(&component.CreepBullet{})
return bullet
}

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entity/player.go Normal file
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package entity
import (
"code.rocketnine.space/tslocum/fishfightback/asset"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/level"
"code.rocketnine.space/tslocum/gohan"
)
func NewPlayer() gohan.Entity {
player := gohan.NewEntity()
player.AddComponent(&component.Position{
Z: level.LayerPlayer,
})
player.AddComponent(&component.Velocity{})
weapon := &component.Weapon{
Damage: 1,
FireRate: 144 / 16,
BulletSpeed: 8,
}
player.AddComponent(weapon)
player.AddComponent(&component.Sprite{
Image: asset.ImgBat,
})
player.AddComponent(&component.Rail{})
return player
}

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entity/playerbullet.go Normal file
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package entity
import (
"code.rocketnine.space/tslocum/fishfightback/asset"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/level"
"code.rocketnine.space/tslocum/gohan"
)
func NewPlayerBullet(x, y, xSpeed, ySpeed float64) gohan.Entity {
bullet := gohan.NewEntity()
bullet.AddComponent(&component.Position{
X: x,
Y: y,
Z: level.LayerBullet,
})
bullet.AddComponent(&component.Velocity{
X: xSpeed,
Y: ySpeed,
})
bullet.AddComponent(&component.Sprite{
Image: asset.ImgBlackSquare,
})
bullet.AddComponent(&component.PlayerBullet{})
return bullet
}

31
flags.go Normal file
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//go:build !js || !wasm
// +build !js !wasm
package main
import (
"flag"
"code.rocketnine.space/tslocum/fishfightback/world"
"github.com/hajimehoshi/ebiten/v2"
)
func parseFlags() {
var (
fullscreen bool
noSplash bool
)
flag.BoolVar(&fullscreen, "fullscreen", false, "run in fullscreen mode")
flag.BoolVar(&noSplash, "no-splash", false, "skip splash screen")
flag.IntVar(&world.World.Debug, "debug", 0, "print debug information")
flag.Parse()
if fullscreen {
ebiten.SetFullscreen(true)
}
if noSplash || world.World.Debug > 0 {
world.StartGame()
//world.World.MessageVisible = false
}
}

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flags_web.go Normal file
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//go:build js && wasm
// +build js,wasm
package main
import (
"code.rocketnine.space/tslocum/fishfightback/world"
"github.com/hajimehoshi/ebiten/v2"
)
func parseFlags() {
world.World.DisableEsc = true
ebiten.SetFullscreen(true)
}

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game/game.go Normal file
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package game
import (
"image/color"
"math/rand"
"os"
"sync"
"time"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/entity"
"code.rocketnine.space/tslocum/gohan"
"code.rocketnine.space/tslocum/fishfightback/asset"
"code.rocketnine.space/tslocum/fishfightback/system"
"code.rocketnine.space/tslocum/fishfightback/world"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/audio"
)
const sampleRate = 44100
// game is an isometric demo game.
type game struct {
audioContext *audio.Context
op *ebiten.DrawImageOptions
disableEsc bool
debugMode bool
cpuProfile *os.File
movementSystem *system.MovementSystem
addedSystems bool
nextSectionX float64
sectionA *world.Section
sectionB *world.Section
firstSectionB bool
sync.Mutex
}
// NewGame returns a new isometric demo game.
func NewGame() (*game, error) {
g := &game{
audioContext: audio.NewContext(sampleRate),
op: &ebiten.DrawImageOptions{},
}
err := g.loadAssets()
if err != nil {
panic(err)
}
const numEntities = 5000 // TODO tweak
gohan.Preallocate(numEntities)
g.sectionA = world.NewSection(0, 0)
g.sectionB = world.NewSection(0, 0)
return g, nil
}
func (g *game) tileToGameCoords(x, y int) (float64, float64) {
return float64(x) * 32, float64(y) * 32
}
// Layout is called when the game's layout changes.
func (g *game) Layout(_, _ int) (int, int) {
return world.ScreenWidth, world.ScreenHeight
}
func (g *game) Update() error {
if ebiten.IsWindowBeingClosed() {
g.Exit()
return nil
}
if world.World.ResetGame {
world.Reset()
if !g.addedSystems {
g.addSystems()
g.addedSystems = true
if world.World.Player == 0 {
world.World.Player = entity.NewPlayer()
}
const playerStartOffset = 128
const camStartOffset = 480
/* w := float64(world.World.Map.Width * world.World.Map.TileWidth)
h := float64(world.World.Map.Height * world.World.Map.TileHeight)*/
world.World.Player.With(func(position *component.Position) {
//position.X, position.Y = w/2, h-playerStartOffset
position.X, position.Y = 200, 3500
})
world.World.CamX, world.World.CamY = 1, 3700-camStartOffset
}
// TODO Seed is configurable
rand.Seed(time.Now().UnixNano())
world.World.ResetGame = false
world.World.GameOver = false
}
world.World.Tick++
// Generate next section by repositioning and regenerating previous section.
if world.World.CamX+world.ScreenWidth >= g.nextSectionX {
s := g.sectionA
if g.firstSectionB {
s = g.sectionB
}
s.SetPosition(g.nextSectionX, world.World.CamY)
s.Regenerate()
g.nextSectionX += world.SectionWidth
g.firstSectionB = !g.firstSectionB
}
err := gohan.Update()
if err != nil {
return err
}
return nil
}
func (g *game) Draw(screen *ebiten.Image) {
err := gohan.Draw(screen)
if err != nil {
panic(err)
}
}
func (g *game) addSystems() {
g.movementSystem = system.NewMovementSystem()
gohan.AddSystem(system.NewPlayerMoveSystem(world.World.Player, g.movementSystem))
gohan.AddSystem(system.NewplayerFireSystem())
gohan.AddSystem(g.movementSystem)
gohan.AddSystem(system.NewCreepSystem())
gohan.AddSystem(system.NewCameraSystem())
gohan.AddSystem(system.NewRailSystem())
const layers = 8
for i := 0; i > -layers; i-- {
gohan.AddSystem(system.NewRenderSystem(i))
}
gohan.AddSystem(system.NewRenderMessageSystem())
gohan.AddSystem(system.NewRenderDebugTextSystem(world.World.Player))
gohan.AddSystem(system.NewProfileSystem(world.World.Player))
}
func (g *game) loadAssets() error {
asset.ImgWhiteSquare.Fill(color.White)
asset.LoadSounds(g.audioContext)
return nil
}
func (g *game) Exit() {
os.Exit(0)
}

23
go.mod Normal file
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module code.rocketnine.space/tslocum/fishfightback
go 1.17
require (
code.rocketnine.space/tslocum/gohan v0.0.0-20220611080547-c66dd322f959
github.com/hajimehoshi/ebiten/v2 v2.3.3
github.com/lafriks/go-tiled v0.7.0
)
require (
github.com/go-gl/glfw/v3.3/glfw v0.0.0-20220516021902-eb3e265c7661 // indirect
github.com/gofrs/flock v0.8.1 // indirect
github.com/hajimehoshi/oto/v2 v2.1.0 // indirect
github.com/jezek/xgb v1.0.1 // indirect
github.com/jfreymuth/oggvorbis v1.0.3 // indirect
github.com/jfreymuth/vorbis v1.0.2 // indirect
golang.org/x/exp/shiny v0.0.0-20220609121020-a51bd0440498 // indirect
golang.org/x/image v0.0.0-20220601225756-64ec528b34cd // indirect
golang.org/x/mobile v0.0.0-20220518205345-8578da9835fd // indirect
golang.org/x/sync v0.0.0-20220601150217-0de741cfad7f // indirect
golang.org/x/sys v0.0.0-20220610221304-9f5ed59c137d // indirect
)

105
go.sum Normal file
View File

@ -0,0 +1,105 @@
code.rocketnine.space/tslocum/gohan v0.0.0-20220611080547-c66dd322f959 h1:gxih+XUGSZbhDAedXqrtJPBBHODDQMl9mBKbHmhFr4Y=
code.rocketnine.space/tslocum/gohan v0.0.0-20220611080547-c66dd322f959/go.mod h1:Z8otqLKIINu0nowsu2IidBFe6M0GkVmGBhP2T4FNKQY=
github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/disintegration/imaging v1.6.2/go.mod h1:44/5580QXChDfwIclfc/PCwrr44amcmDAg8hxG0Ewe4=
github.com/go-gl/glfw/v3.3/glfw v0.0.0-20220320163800-277f93cfa958/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
github.com/go-gl/glfw/v3.3/glfw v0.0.0-20220516021902-eb3e265c7661 h1:1bpooddSK2996NWM/1TW59cchQOm9MkoV9DkhSJH1BI=
github.com/go-gl/glfw/v3.3/glfw v0.0.0-20220516021902-eb3e265c7661/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
github.com/gofrs/flock v0.8.1 h1:+gYjHKf32LDeiEEFhQaotPbLuUXjY5ZqxKgXy7n59aw=
github.com/gofrs/flock v0.8.1/go.mod h1:F1TvTiK9OcQqauNUHlbJvyl9Qa1QvF/gOUDKA14jxHU=
github.com/hajimehoshi/bitmapfont/v2 v2.2.0/go.mod h1:Llj2wTYXMuCTJEw2ATNIO6HbFPOoBYPs08qLdFAxOsQ=
github.com/hajimehoshi/ebiten/v2 v2.3.3 h1:v72UzprVvWGE+HGcypkLI9Ikd237fqzpio5idPk9KNI=
github.com/hajimehoshi/ebiten/v2 v2.3.3/go.mod h1:vxwpo0q0oSi1cIll0Q3Ui33TVZgeHuFVYzIRk7FwuVk=
github.com/hajimehoshi/file2byteslice v0.0.0-20210813153925-5340248a8f41/go.mod h1:CqqAHp7Dk/AqQiwuhV1yT2334qbA/tFWQW0MD2dGqUE=
github.com/hajimehoshi/go-mp3 v0.3.3/go.mod h1:qMJj/CSDxx6CGHiZeCgbiq2DSUkbK0UbtXShQcnfyMM=
github.com/hajimehoshi/oto v0.6.1/go.mod h1:0QXGEkbuJRohbJaxr7ZQSxnju7hEhseiPx2hrh6raOI=
github.com/hajimehoshi/oto/v2 v2.1.0 h1:/h+UkbKzhD7xBHOQlWgKUplBPZ+J4DK3P2Y7g2UF1X4=
github.com/hajimehoshi/oto/v2 v2.1.0/go.mod h1:9i0oYbpJ8BhVGkXDKdXKfFthX1JUNfXjeTp944W8TGM=
github.com/jakecoffman/cp v1.1.0/go.mod h1:JjY/Fp6d8E1CHnu74gWNnU0+b9VzEdUVPoJxg2PsTQg=
github.com/jezek/xgb v1.0.0/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
github.com/jezek/xgb v1.0.1 h1:YUGhxps0aR7J2Xplbs23OHnV1mWaxFVcOl9b+1RQkt8=
github.com/jezek/xgb v1.0.1/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
github.com/jfreymuth/oggvorbis v1.0.3 h1:MLNGGyhOMiVcvea9Dp5+gbs2SAwqwQbtrWnonYa0M0Y=
github.com/jfreymuth/oggvorbis v1.0.3/go.mod h1:1U4pqWmghcoVsCJJ4fRBKv9peUJMBHixthRlBeD6uII=
github.com/jfreymuth/vorbis v1.0.2 h1:m1xH6+ZI4thH927pgKD8JOH4eaGRm18rEE9/0WKjvNE=
github.com/jfreymuth/vorbis v1.0.2/go.mod h1:DoftRo4AznKnShRl1GxiTFCseHr4zR9BN3TWXyuzrqQ=
github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/lafriks/go-tiled v0.7.0 h1:xb1iVYtPpjpHx9i/LjqHwoS2xdfrihCsFRKOFn7fOBU=
github.com/lafriks/go-tiled v0.7.0/go.mod h1:xy+4iO8AKWpFNBWeqBqnq+Cb3Oirm5oin/irP/jPx6A=
github.com/pkg/browser v0.0.0-20210911075715-681adbf594b8/go.mod h1:HKlIX3XHQyzLZPlr7++PzdhaXEj94dEiJgZDTsxEqUI=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/yuin/goldmark v1.4.0/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
github.com/yuin/goldmark v1.4.1/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56/go.mod h1:JhuoJpWY28nO4Vef9tZUw9qufEGTyX1+7lmHxV5q5G4=
golang.org/x/exp/shiny v0.0.0-20220609121020-a51bd0440498 h1:mJjyic/dxHcz1W6IUE8zf6+RltuO8+9mS45tTtb4F6k=
golang.org/x/exp/shiny v0.0.0-20220609121020-a51bd0440498/go.mod h1:VjAR7z0ngyATZTELrBSkxOOHhhlnVUxDye4mcjx5h/8=
golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
golang.org/x/image v0.0.0-20211028202545-6944b10bf410/go.mod h1:023OzeP/+EPmXeapQh35lcL3II3LrY8Ic+EFFKVhULM=
golang.org/x/image v0.0.0-20220321031419-a8550c1d254a/go.mod h1:023OzeP/+EPmXeapQh35lcL3II3LrY8Ic+EFFKVhULM=
golang.org/x/image v0.0.0-20220601225756-64ec528b34cd h1:9NbNcTg//wfC5JskFW4Z3sqwVnjmJKHxLAol1bW2qgw=
golang.org/x/image v0.0.0-20220601225756-64ec528b34cd/go.mod h1:doUCurBvlfPMKfmIpRIywoHmhN3VyhnoFDbvIEWF4hY=
golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
golang.org/x/mobile v0.0.0-20190415191353-3e0bab5405d6/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
golang.org/x/mobile v0.0.0-20220518205345-8578da9835fd h1:x1GptNaTtxPAlTVIAJk61fuXg0y17h09DTxyb+VNC/k=
golang.org/x/mobile v0.0.0-20220518205345-8578da9835fd/go.mod h1:pe2sM7Uk+2Su1y7u/6Z8KJ24D7lepUjFZbhFOrmDfuQ=
golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3/go.mod h1:3p9vT2HGsQu2K1YbXdKPJLVgG5VJdoTa1poYQBtP1AY=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/net v0.0.0-20210805182204-aaa1db679c0d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20220601150217-0de741cfad7f h1:Ax0t5p6N38Ga0dThY21weqDEyz2oklo4IvDkpigvkD8=
golang.org/x/sync v0.0.0-20220601150217-0de741cfad7f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190429190828-d89cdac9e872/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20210616045830-e2b7044e8c71/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20211019181941-9d821ace8654/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220408201424-a24fb2fb8a0f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220610221304-9f5ed59c137d h1:Zu/JngovGLVi6t2J3nmAf3AoTDwuzw85YZ3b9o4yU7s=
golang.org/x/sys v0.0.0-20220610221304-9f5ed59c137d/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.1.8-0.20211022200916-316ba0b74098/go.mod h1:LGqMHiF4EqQNHR1JncWGqT5BVaXmza+X+BDGol+dOxo=
golang.org/x/tools v0.1.10/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

29
goreleaser.yml Normal file
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@ -0,0 +1,29 @@
project_name: fishfightback
builds:
-
id: fishfightback
goos:
- js
- linux
- windows
goarch:
- amd64
- wasm
archives:
-
id: fishfightback
builds:
- fishfightback
replacements:
386: i386
format_overrides:
- goos: js
format: zip
- goos: windows
format: zip
files:
- ./*.md
- LICENSE
checksum:
name_template: 'checksums.txt'

12
level/level.go Normal file
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@ -0,0 +1,12 @@
package level
const (
LayerDefault = 0 - iota
LayerSea
LayerLand
LayerBuilding
LayerDecoration
LayerCreep
LayerBullet
LayerPlayer
)

48
main.go Normal file
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@ -0,0 +1,48 @@
package main
import (
"log"
"os"
"os/signal"
"syscall"
"code.rocketnine.space/tslocum/fishfightback/game"
"code.rocketnine.space/tslocum/fishfightback/world"
"github.com/hajimehoshi/ebiten/v2"
)
func main() {
ebiten.SetWindowTitle("Fish Fight Back")
ebiten.SetWindowResizable(true)
// ebiten.SetFullscreen(true) // TODO
ebiten.SetWindowSize(world.ScreenWidth, world.ScreenHeight)
ebiten.SetMaxTPS(144)
ebiten.SetRunnableOnUnfocused(true) // Note - this currently does nothing in ebiten
ebiten.SetWindowClosingHandled(true)
ebiten.SetFPSMode(ebiten.FPSModeVsyncOn)
ebiten.SetCursorMode(ebiten.CursorModeHidden)
g, err := game.NewGame()
if err != nil {
log.Fatal(err)
}
parseFlags()
sigc := make(chan os.Signal, 1)
signal.Notify(sigc,
syscall.SIGINT,
syscall.SIGTERM)
go func() {
<-sigc
g.Exit()
}()
world.StartGame()
err = ebiten.RunGame(g)
if err != nil {
log.Fatal(err)
}
}

42
system/camera.go Normal file
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@ -0,0 +1,42 @@
package system
import (
"math"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/world"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
)
const CameraMoveSpeed = 0.25
type CameraSystem struct {
Weapon *component.Weapon
Position *component.Position
}
func NewCameraSystem() *CameraSystem {
s := &CameraSystem{}
return s
}
func (s *CameraSystem) Update(e gohan.Entity) error {
if !world.World.GameStarted || world.World.GameOver {
return nil
}
world.World.CamMoving = world.World.CamX > 0
if world.World.CamMoving {
world.World.CamX += CameraMoveSpeed
} else {
world.SetMessage("GAME OVER\n\nYOU WIN!", math.MaxInt)
world.World.GameOver = true
}
return nil
}
func (_ *CameraSystem) Draw(_ gohan.Entity, _ *ebiten.Image) error {
return gohan.ErrUnregister
}

109
system/creep.go Normal file
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@ -0,0 +1,109 @@
package system
import (
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/entity"
"code.rocketnine.space/tslocum/fishfightback/world"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
)
// pause time, screen X, screen Y
type CreepSystem struct {
Creep *component.Creep
Position *component.Position
Sprite *component.Sprite `gohan:"?"`
Weapon *component.Weapon `gohan:"?"`
}
func NewCreepSystem() *CreepSystem {
s := &CreepSystem{}
return s
}
func (s *CreepSystem) Update(e gohan.Entity) error {
if !world.World.GameStarted {
return nil
}
creep := s.Creep
position := s.Position
if creep.Health <= 0 {
return nil
}
// Skip inactive creeps.
sx, sy := world.LevelCoordinatesToScreen(position.X, position.Y)
inactive := sx < 0 || sy < 0 || sx > float64(world.ScreenWidth) || sy > float64(world.ScreenHeight)
if creep.Active != !inactive {
creep.Active = !inactive
}
if inactive {
return nil
}
l := len(creep.Movements)
if l > creep.Movement {
if creep.MovementTicks == 0 {
m := creep.Movements[creep.Movement]
position.X, position.Y = m[0], m[1]
creep.Movement++
creep.MovementTicks = int(m[2])
}
creep.MovementTicks--
}
randVelocity := func() (float64, float64) {
for {
vx := creep.Rand.Float64()*0.5 + (0.5 - creep.Rand.Float64())
vy := creep.Rand.Float64()*0.5 + (0.5 - creep.Rand.Float64())
if vx > 0.5 || vx < -0.5 || vy > 0.5 || vy < -0.5 {
return vx, vy
}
}
}
if creep.FireTicks == 0 {
for i := 0; i < creep.FireAmount; i++ {
vx, vy := randVelocity()
if creep.Rand.Intn(2) == 0 {
vx *= -1
}
if creep.Rand.Intn(2) == 0 {
vy *= -1
}
entity.NewCreepBullet(position.X, position.Y, vx, vy)
}
creep.FireTicks = creep.FireRate
}
creep.FireTicks--
if creep.DamageTicks > 0 {
creep.DamageTicks--
sprite := s.Sprite
if sprite != nil {
if creep.DamageTicks > 0 {
if creep.DamageTicks%2 == 0 {
sprite.ColorScale = 100
} else {
sprite.ColorScale = .01
}
sprite.OverrideColorScale = true
} else {
sprite.OverrideColorScale = false
}
}
}
return nil
}
func (_ *CreepSystem) Draw(_ gohan.Entity, _ *ebiten.Image) error {
return gohan.ErrUnregister
}

49
system/input_fire.go Normal file
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@ -0,0 +1,49 @@
package system
import (
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/entity"
"code.rocketnine.space/tslocum/fishfightback/world"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
)
const (
fireSpeed = 1.5
)
type playerFireSystem struct {
Position *component.Position
Velocity *component.Velocity
Weapon *component.Weapon
Sprite *component.Sprite
}
func NewplayerFireSystem() *playerFireSystem {
return &playerFireSystem{}
}
func (s *playerFireSystem) Update(e gohan.Entity) error {
if !world.World.GameStarted || world.World.GameOver {
return nil
}
position := s.Position
weapon := s.Weapon
if ebiten.IsKeyPressed(ebiten.KeyZ) || ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
if weapon.NextFire == 0 {
entity.NewPlayerBullet(position.X-8, position.Y-8, 0, -weapon.BulletSpeed)
entity.NewPlayerBullet(position.X+8, position.Y-8, 0, -weapon.BulletSpeed)
weapon.NextFire = weapon.FireRate
}
}
if weapon.NextFire > 0 {
weapon.NextFire--
}
return nil
}
func (s *playerFireSystem) Draw(_ gohan.Entity, _ *ebiten.Image) error {
return gohan.ErrUnregister
}

117
system/input_move.go Normal file
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@ -0,0 +1,117 @@
package system
import (
"os"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/world"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/inpututil"
)
const (
moveSpeed = 1.0
)
type playerMoveSystem struct {
Position *component.Position
Velocity *component.Velocity
Weapon *component.Weapon
Sprite *component.Sprite
player gohan.Entity
movement *MovementSystem
lastWalkDirL bool
rewindTicks int
nextRewindTick int
}
func NewPlayerMoveSystem(player gohan.Entity, m *MovementSystem) *playerMoveSystem {
return &playerMoveSystem{
player: player,
movement: m,
}
}
func (s *playerMoveSystem) Update(e gohan.Entity) error {
if ebiten.IsKeyPressed(ebiten.KeyEscape) && !world.World.DisableEsc {
os.Exit(0)
return nil
}
if ebiten.IsKeyPressed(ebiten.KeyControl) && inpututil.IsKeyJustPressed(ebiten.KeyV) {
v := 1
if ebiten.IsKeyPressed(ebiten.KeyShift) {
v = 2
}
if world.World.Debug == v {
world.World.Debug = 0
} else {
world.World.Debug = v
}
return nil
}
if ebiten.IsKeyPressed(ebiten.KeyControl) && inpututil.IsKeyJustPressed(ebiten.KeyN) {
world.World.NoClip = !world.World.NoClip
return nil
}
if !world.World.GameStarted {
if ebiten.IsKeyPressed(ebiten.KeyEnter) || ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
world.StartGame()
}
return nil
}
if world.World.GameOver {
if inpututil.IsKeyJustPressed(ebiten.KeyEnter) {
world.World.ResetGame = true
}
return nil
}
pressLeft := ebiten.IsKeyPressed(ebiten.KeyLeft) || ebiten.IsKeyPressed(ebiten.KeyA)
pressRight := ebiten.IsKeyPressed(ebiten.KeyRight) || ebiten.IsKeyPressed(ebiten.KeyD)
pressUp := ebiten.IsKeyPressed(ebiten.KeyUp) || ebiten.IsKeyPressed(ebiten.KeyW)
pressDown := ebiten.IsKeyPressed(ebiten.KeyDown) || ebiten.IsKeyPressed(ebiten.KeyS)
if (pressLeft && !pressRight) ||
(pressRight && !pressLeft) {
if pressLeft {
s.Velocity.X = -moveSpeed
} else {
s.Velocity.X = moveSpeed
}
} else {
s.Velocity.X = 0
}
if (pressUp && !pressDown) ||
(pressDown && !pressUp) {
if pressUp {
s.Velocity.Y = -moveSpeed
} else {
s.Velocity.Y = moveSpeed
}
} else {
s.Velocity.Y = 0
}
return nil
}
func (s *playerMoveSystem) Draw(_ gohan.Entity, _ *ebiten.Image) error {
return gohan.ErrUnregister
}
func deltaXY(x1, y1, x2, y2 float64) (dx float64, dy float64) {
dx, dy = x1-x2, y1-y2
if dx < 0 {
dx *= -1
}
if dy < 0 {
dy *= -1
}
return dx, dy
}

60
system/input_profile.go Normal file
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package system
import (
"os"
"path"
"runtime"
"runtime/pprof"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/inpututil"
)
type profileSystem struct {
Weapon *component.Weapon
player gohan.Entity
cpuProfile *os.File
}
func NewProfileSystem(player gohan.Entity) *profileSystem {
return &profileSystem{
player: player,
}
}
func (s *profileSystem) Update(_ gohan.Entity) error {
if ebiten.IsKeyPressed(ebiten.KeyControl) && inpututil.IsKeyJustPressed(ebiten.KeyP) {
if s.cpuProfile == nil {
runtime.SetCPUProfileRate(1000)
homeDir, err := os.UserHomeDir()
if err != nil {
return err
}
s.cpuProfile, err = os.Create(path.Join(homeDir, "bbbb.prof"))
if err != nil {
return err
}
err = pprof.StartCPUProfile(s.cpuProfile)
if err != nil {
return err
}
} else {
pprof.StopCPUProfile()
s.cpuProfile.Close()
s.cpuProfile = nil
}
}
return nil
}
func (s *profileSystem) Draw(_ gohan.Entity, _ *ebiten.Image) error {
return gohan.ErrUnregister
}

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system/movement.go Normal file
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package system
import (
"image"
"image/color"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/world"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
)
const rewindThreshold = 1
type MovementSystem struct {
Position *component.Position
Velocity *component.Velocity
Creep *component.Creep `gohan:"?"`
CreepBullet *component.CreepBullet `gohan:"?"`
PlayerBullet *component.PlayerBullet `gohan:"?"`
Sprite *component.Sprite `gohan:"?"`
}
func NewMovementSystem() *MovementSystem {
s := &MovementSystem{}
return s
}
func drawDebugRect(r image.Rectangle, c color.Color, overrideColorScale bool) gohan.Entity {
rectEntity := gohan.NewEntity()
rectImg := ebiten.NewImage(r.Dx(), r.Dy())
rectImg.Fill(c)
rectEntity.AddComponent(&component.Position{
X: float64(r.Min.X),
Y: float64(r.Min.Y),
})
rectEntity.AddComponent(&component.Sprite{
Image: rectImg,
OverrideColorScale: overrideColorScale,
})
return rectEntity
}
func (s *MovementSystem) Update(e gohan.Entity) error {
if !world.World.GameStarted {
return nil
}
if world.World.GameOver && e == world.World.Player {
return nil
}
position := s.Position
velocity := s.Velocity
vx, vy := velocity.X, velocity.Y
if e == world.World.Player && (world.World.NoClip || world.World.Debug != 0) && ebiten.IsKeyPressed(ebiten.KeyShift) {
vx, vy = vx*2, vy*2
}
position.X, position.Y = position.X+vx, position.Y+vy
// Force player to remain within the screen bounds.
// TODO same for bullets
if e == world.World.Player {
screenX, screenY := s.levelCoordinatesToScreen(position.X, position.Y)
if screenX < 0 {
diff := screenX / world.World.CamScale
position.X -= diff
} else if screenX > float64(world.ScreenWidth)-world.World.PlayerWidth {
diff := (float64(world.ScreenWidth) - world.World.PlayerWidth - screenX) / world.World.CamScale
position.X += diff
}
if screenY < 0 {
diff := screenY / world.World.CamScale
position.Y -= diff
} else if screenY > float64(world.ScreenHeight)-world.World.PlayerHeight {
diff := (float64(world.ScreenHeight) - world.World.PlayerHeight - screenY) / world.World.CamScale
position.Y += diff
}
world.World.PlayerX, world.World.PlayerY = position.X, position.Y
// Check player hazard collision.
if world.World.NoClip {
return nil
}
/*playerRect := image.Rect(int(position.X), int(position.Y), int(position.X+world.World.PlayerWidth), int(position.Y+world.World.PlayerHeight))
for _, r := range world.World.HazardRects {
if playerRect.Overlaps(r) {
world.World.SetGameOver()
return nil
}
}*/
}
// Check creepBullet collision.
if world.World.NoClip {
return nil
}
bulletSize := 8.0
bulletRect := image.Rect(int(position.X), int(position.Y), int(position.X+bulletSize), int(position.Y+bulletSize))
creepBullet := s.CreepBullet
playerBullet := s.PlayerBullet
// Check hazard collisions.
if creepBullet != nil || playerBullet != nil {
/* TODO
for _, hazardRect := range world.World.HazardRects {
if bulletRect.Overlaps(hazardRect) {
e.Remove()
return nil
}
} */
}
if creepBullet != nil {
playerRect := image.Rect(int(world.World.PlayerX), int(world.World.PlayerY), int(world.World.PlayerX+world.World.PlayerWidth), int(world.World.PlayerY+world.World.PlayerHeight))
// TODO if not god mode
if bulletRect.Overlaps(playerRect) {
world.World.SetGameOver()
}
return nil
}
if playerBullet != nil {
/* TODO
var hitCreep bool
for i, creepRect := range world.World.CreepRects {
if bulletRect.Overlaps(creepRect) {
creepEntity := world.World.CreepEntities[i]
creepEntity.With(func(creep *component.Creep) {
if creep.Active {
creep.Health--
creep.DamageTicks = 6
hitCreep = true
}
})
if hitCreep {
e.Remove()
return nil
}
}
} */
}
return nil
}
func (s *MovementSystem) levelCoordinatesToScreen(x, y float64) (float64, float64) {
return (x - world.World.CamX) * world.World.CamScale, (y - world.World.CamY) * world.World.CamScale
}
func (_ *MovementSystem) Draw(_ gohan.Entity, _ *ebiten.Image) error {
return gohan.ErrUnregister
}

32
system/rail.go Normal file
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package system
import (
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/world"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
)
type RailSystem struct {
Rail *component.Rail
Position *component.Position
}
func NewRailSystem() *RailSystem {
s := &RailSystem{}
return s
}
func (s *RailSystem) Update(e gohan.Entity) error {
if !world.World.GameStarted || world.World.GameOver || !world.World.CamMoving {
return nil
}
s.Position.X += CameraMoveSpeed
return nil
}
func (_ *RailSystem) Draw(_ gohan.Entity, _ *ebiten.Image) error {
return gohan.ErrUnregister
}

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system/render.go Normal file
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package system
import (
_ "image/png"
"time"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/world"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
)
const (
TileWidth = 32
logoText = "POWERED BY EBITEN"
logoTextScale = 4.75
logoTextWidth = 6.0 * float64(len(logoText)) * logoTextScale
logoTime = 144 * 3.5
fadeInTime = 144 * 0.75
)
type RenderSystem struct {
Position *component.Position
Sprite *component.Sprite
img *ebiten.Image `gohan:"-"`
op *ebiten.DrawImageOptions `gohan:"-"`
camScale float64 `gohan:"-"`
renderer gohan.Entity `gohan:"-"`
z int
}
func NewRenderSystem(z int) *RenderSystem {
s := &RenderSystem{
renderer: gohan.NewEntity(),
img: ebiten.NewImage(320, 100),
op: &ebiten.DrawImageOptions{},
camScale: 1,
z: z, // Only the specified z-level will be rendered by this system.
}
return s
}
func (s *RenderSystem) Update(_ gohan.Entity) error {
return gohan.ErrUnregister
}
func (s *RenderSystem) levelCoordinatesToScreen(x, y float64) (float64, float64) {
px, py := world.World.CamX, world.World.CamY
py *= -1
return ((x - px) * s.camScale), ((y + py) * s.camScale)
}
// renderSprite renders a sprite on the screen.
func (s *RenderSystem) renderSprite(x float64, y float64, offsetx float64, offsety float64, angle float64, geoScale float64, colorScale float64, alpha float64, hFlip bool, vFlip bool, sprite *ebiten.Image, target *ebiten.Image) int {
if alpha < .01 || colorScale < .01 {
return 0
}
// Skip drawing off-screen tiles.
drawX, drawY := s.levelCoordinatesToScreen(x, y)
const padding = TileWidth * 4
width, height := float64(TileWidth), float64(TileWidth)
left := drawX
right := drawX + width
top := drawY
bottom := drawY + height
if (left < -padding || left > float64(world.ScreenWidth)+padding) || (top < -padding || top > float64(world.ScreenHeight)+padding) ||
(right < -padding || right > float64(world.ScreenWidth)+padding) || (bottom < -padding || bottom > float64(world.ScreenHeight)+padding) {
return 0
}
s.op.GeoM.Reset()
if hFlip {
s.op.GeoM.Scale(-1, 1)
s.op.GeoM.Translate(TileWidth, 0)
}
if vFlip {
s.op.GeoM.Scale(1, -1)
s.op.GeoM.Translate(0, TileWidth)
}
s.op.GeoM.Scale(geoScale, geoScale)
// Rotate
s.op.GeoM.Translate(offsetx, offsety)
s.op.GeoM.Rotate(angle)
// Move to current isometric position.
s.op.GeoM.Translate(x, y)
// Translate camera position.
s.op.GeoM.Translate(-world.World.CamX, -world.World.CamY)
// Zoom.
s.op.GeoM.Scale(s.camScale, s.camScale)
// Center.
//s.op.GeoM.Translate(float64(s.ScreenW/2.0), float64(s.ScreenH/2.0))
// Fade in.
if world.World.Tick < 72 {
colorScale = float64(world.World.Tick) / 72
}
s.op.ColorM.Scale(colorScale, colorScale, colorScale, alpha)
target.DrawImage(sprite, s.op)
s.op.ColorM.Reset()
return 1
}
func (s *RenderSystem) Draw(e gohan.Entity, screen *ebiten.Image) error {
position := s.Position
sprite := s.Sprite
if position.Z != s.z {
return nil
}
if sprite.NumFrames > 0 && time.Since(sprite.LastFrame) > sprite.FrameTime {
sprite.Frame++
if sprite.Frame >= sprite.NumFrames {
sprite.Frame = 0
}
sprite.Image = sprite.Frames[sprite.Frame]
sprite.LastFrame = time.Now()
}
colorScale := 1.0
if sprite.OverrideColorScale {
colorScale = sprite.ColorScale
}
s.renderSprite(position.X, position.Y, 0, 0, sprite.Angle, 1.0, colorScale, 1.0, sprite.HorizontalFlip, sprite.VerticalFlip, sprite.Image, screen)
return nil
}

51
system/renderdebug.go Normal file
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package system
import (
"fmt"
"image/color"
_ "image/png"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/world"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
)
type RenderDebugTextSystem struct {
Position *component.Position
Velocity *component.Velocity
Weapon *component.Weapon
player gohan.Entity
op *ebiten.DrawImageOptions
debugImg *ebiten.Image
}
func NewRenderDebugTextSystem(player gohan.Entity) *RenderDebugTextSystem {
s := &RenderDebugTextSystem{
player: player,
op: &ebiten.DrawImageOptions{},
debugImg: ebiten.NewImage(94, 114),
}
return s
}
func (s *RenderDebugTextSystem) Update(_ gohan.Entity) error {
return gohan.ErrUnregister
}
func (s *RenderDebugTextSystem) Draw(e gohan.Entity, screen *ebiten.Image) error {
if world.World.Debug <= 0 {
return nil
}
position := s.Position
velocity := s.Velocity
s.debugImg.Fill(color.RGBA{0, 0, 0, 80})
ebitenutil.DebugPrint(s.debugImg, fmt.Sprintf("POS %.0f,%.0f\nVEL %.2f,%.2f\nENT %d\nUPD %d\nDRA %d\nTPS %0.0f\nFPS %0.0f", position.X, position.Y, velocity.X, velocity.Y, gohan.CurrentEntities(), gohan.CurrentUpdates(), gohan.CurrentDraws(), ebiten.CurrentTPS(), ebiten.CurrentFPS()))
screen.DrawImage(s.debugImg, nil)
return nil
}

92
system/rendermessage.go Normal file
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package system
import (
"image/color"
"strings"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/world"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
)
type RenderMessageSystem struct {
Position *component.Position
Velocity *component.Velocity
Weapon *component.Weapon
op *ebiten.DrawImageOptions
logoImg *ebiten.Image
msgImg *ebiten.Image
tmpImg *ebiten.Image
}
func NewRenderMessageSystem() *RenderMessageSystem {
s := &RenderMessageSystem{
op: &ebiten.DrawImageOptions{},
logoImg: ebiten.NewImage(1, 1),
msgImg: ebiten.NewImage(1, 1),
tmpImg: ebiten.NewImage(200, 200),
}
return s
}
func (s *RenderMessageSystem) Update(_ gohan.Entity) error {
if !world.World.GameStarted || world.World.GameOver || !world.World.MessageVisible {
return nil
}
world.World.MessageTicks++
if world.World.MessageTicks == world.World.MessageDuration {
world.World.MessageVisible = false
return nil
}
return nil
}
func (s *RenderMessageSystem) Draw(_ gohan.Entity, screen *ebiten.Image) error {
if !world.World.GameStarted || !world.World.MessageVisible {
return nil
}
// Draw message.
if world.World.MessageUpdated {
s.drawMessage()
}
bounds := s.msgImg.Bounds()
x := (float64(world.ScreenWidth) / 2) - (float64(bounds.Dx()) / 2)
y := (float64(world.ScreenHeight) / 2) - (float64(bounds.Dy()) / 2)
s.op.GeoM.Reset()
s.op.GeoM.Translate(x, y)
screen.DrawImage(s.msgImg, s.op)
return nil
}
func (s *RenderMessageSystem) drawMessage() {
split := strings.Split(world.World.MessageText, "\n")
width := 0
for _, line := range split {
lineSize := len(line) * 12
if lineSize > width {
width = lineSize
}
}
height := len(split) * 32
const padding = 8
width, height = width+padding*2, height+padding*2
s.msgImg = ebiten.NewImage(width, height)
s.msgImg.Fill(color.RGBA{17, 17, 17, 255})
s.tmpImg.Clear()
s.tmpImg = ebiten.NewImage(width*2, height*2)
s.op.GeoM.Reset()
s.op.GeoM.Scale(2, 2)
s.op.GeoM.Translate(float64(padding), float64(padding))
ebitenutil.DebugPrint(s.tmpImg, world.World.MessageText)
s.msgImg.DrawImage(s.tmpImg, s.op)
s.op.ColorM.Reset()
}

208
world/building.go Normal file
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package world
var buildingFishingShackA = [][][2]int{
{
{23, 0},
{24, 0},
{25, 0},
{26, 0},
{27, 0},
},
{
{23, 1},
{24, 1},
{25, 1},
{26, 1},
{27, 1},
},
{
{23, 2},
{24, 2},
{25, 2},
{26, 2},
{27, 2},
},
{
{23, 3},
{24, 3},
{25, 3},
{26, 3},
{27, 3},
},
}
var buildingFishingShackB = [][][2]int{
{
{28, 0},
{29, 0},
{30, 0},
{31, 0},
{32, 0},
},
{
{28, 1},
{29, 1},
{30, 1},
{31, 1},
{32, 1},
},
{
{28, 2},
{29, 2},
{30, 2},
{31, 2},
{32, 2},
},
{
{28, 3},
{29, 3},
{30, 3},
{31, 3},
{32, 3},
},
}
var buildingFishingShackC = [][][2]int{
{
{33, 0},
{34, 0},
{35, 0},
{36, 0},
{37, 0},
},
{
{33, 1},
{34, 1},
{35, 1},
{36, 1},
{37, 1},
},
{
{33, 2},
{34, 2},
{35, 2},
{36, 2},
{37, 2},
},
{
{33, 3},
{34, 3},
{35, 3},
{36, 3},
{37, 3},
},
}
var buildingBar = [][][2]int{
{
{23, 6},
{24, 6},
{25, 6},
{26, 6},
{27, 6},
},
{
{23, 7},
{24, 7},
{25, 7},
{26, 7},
{27, 7},
},
{
{23, 8},
{24, 8},
{25, 8},
{26, 8},
{27, 8},
},
{
{23, 9},
{24, 9},
{25, 9},
{26, 9},
{27, 9},
},
{
{23, 10},
{24, 10},
{25, 10},
{26, 10},
{27, 10},
},
}
var buildingCrabShackA = [][][2]int{
{
{28, 6},
{29, 6},
{30, 6},
{31, 6},
{32, 6},
},
{
{28, 7},
{29, 7},
{30, 7},
{31, 7},
{32, 7},
},
{
{28, 8},
{29, 8},
{30, 8},
{31, 8},
{32, 8},
},
{
{28, 9},
{29, 9},
{30, 9},
{31, 9},
{32, 9},
},
{
{28, 10},
{29, 10},
{30, 10},
{31, 10},
{32, 10},
},
}
var buildingCrabShackB = [][][2]int{
{
{33, 6},
{34, 6},
{35, 6},
{36, 6},
{37, 6},
},
{
{33, 7},
{34, 7},
{35, 7},
{36, 7},
{37, 7},
},
{
{33, 8},
{34, 8},
{35, 8},
{36, 8},
{37, 8},
},
{
{33, 9},
{34, 9},
{35, 9},
{36, 9},
{37, 9},
},
{
{33, 10},
{34, 10},
{35, 10},
{36, 10},
{37, 10},
},
}

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world/section.go Normal file
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package world
import (
"math/rand"
"code.rocketnine.space/tslocum/fishfightback/entity"
"code.rocketnine.space/tslocum/fishfightback/level"
"code.rocketnine.space/tslocum/fishfightback/asset"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
)
// TODO tweak
const SectionWidth = ScreenWidth
type Section struct {
X float64
Y float64
Entities []gohan.Entity
}
func NewSection(x, y float64) *Section {
s := &Section{
X: x,
Y: y,
}
return s
}
func (s *Section) SetPosition(x float64, y float64) {
s.X = x
s.Y = y
}
func (s *Section) Regenerate() {
for _, e := range s.Entities {
e.Remove()
}
s.Entities = s.Entities[:0]
maxShoreDepth := 2 + rand.Intn(5)
// Fill with sea water.
// TODO optimize
for y := 0; y < ScreenHeight/16; y++ {
for x := 0; x < ScreenWidth/16; x++ {
e := gohan.NewEntity()
e.AddComponent(&component.Position{
X: s.X + float64(x)*16,
Y: s.Y + float64(y)*16,
Z: level.LayerSea,
})
e.AddComponent(&component.Sprite{
Image: asset.ImgWater,
})
s.Entities = append(s.Entities, e)
}
}
// Generate land.
var tile *ebiten.Image
for y := 0; y < maxShoreDepth; y++ {
for x := 0; x < SectionWidth/16; x++ {
if y == maxShoreDepth-1 {
tile = asset.FishTileXY(1, 14)
} else {
switch rand.Intn(4) {
case 0:
tile = asset.FishTileXY(5, 9)
case 1:
tile = asset.FishTileXY(6, 9)
case 2:
tile = asset.FishTileXY(5, 10)
case 3:
tile = asset.FishTileXY(6, 10)
}
}
e := gohan.NewEntity()
e.AddComponent(&component.Position{
X: s.X + float64(x)*16,
Y: s.Y + float64(y)*16,
Z: level.LayerLand,
})
e.AddComponent(&component.Sprite{
Image: tile,
})
s.Entities = append(s.Entities, e)
}
}
// Generate buildings.
// TODO bag of random buildings
addBuildings := rand.Intn(7)
nextX := s.X
for j := 0; j < addBuildings; j++ {
building := buildingFishingShackA
switch rand.Intn(6) {
case 0:
building = buildingFishingShackB
case 1:
building = buildingFishingShackC
case 2:
building = buildingBar
case 3:
building = buildingCrabShackA
case 4:
building = buildingCrabShackB
}
buildingHeight := len(building)
buildingWidth := len(building[0])
remaining := SectionWidth - int(nextX-s.X) - buildingWidth*16
if remaining <= 0 {
break
}
var bx, by float64
const attempts = 3
const buffer = 50.0
for attempt := 0; attempt < attempts; attempt++ {
bx, by = nextX+float64(rand.Intn(remaining)), s.Y+float64(rand.Intn(maxShoreDepth*16)-buildingHeight*16)-12
if bx-nextX >= buffer {
break
}
}
s.build(building, bx, by, level.LayerBuilding)
nextX = bx + float64(buildingWidth*16)
}
for i := 0; i < 10; i++ {
x, y := s.X+float64(i)*16, s.Y+100
creep := entity.NewCreep(0, x, y)
s.Entities = append(s.Entities, creep)
}
}
func (s *Section) build(tiles [][][2]int, x, y float64, z int) {
for ty := range tiles {
for tx, tile := range tiles[ty] {
e := gohan.NewEntity()
e.AddComponent(&component.Position{
X: x + float64(tx)*16,
Y: y + float64(ty)*16,
Z: z,
})
e.AddComponent(&component.Sprite{
Image: asset.FishTileXY(tile[0], tile[1]),
})
s.Entities = append(s.Entities, e)
}
}
}

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world/world.go Normal file
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package world
import (
"math"
"code.rocketnine.space/tslocum/gohan"
)
const (
ScreenWidth = 400
ScreenHeight = 225
)
var World = &GameWorld{
CamScale: 1,
CamMoving: true,
PlayerWidth: 16,
PlayerHeight: 16,
ResetGame: true,
}
type GameWorld struct {
Player gohan.Entity
DisableEsc bool
Debug int
NoClip bool
GameStarted bool
GameStartedTicks int
GameOver bool
MessageVisible bool
MessageTicks int
MessageDuration int
MessageUpdated bool
MessageText string
PlayerX, PlayerY float64
CamX, CamY float64
CamScale float64
CamMoving bool
PlayerWidth float64
PlayerHeight float64
ResetGame bool
resetTipShown bool
Tick int
}
func Reset() {
for _, e := range gohan.AllEntities() {
e.Remove()
}
World.Player = 0
World.MessageVisible = false
}
func LevelCoordinatesToScreen(x, y float64) (float64, float64) {
return (x - World.CamX) * World.CamScale, (y - World.CamY) * World.CamScale
}
func (w *GameWorld) SetGameOver() {
if w.GameOver {
return
}
w.GameOver = true
if !World.resetTipShown {
SetMessage(" GAME OVER\n\nRESET: <ENTER>", math.MaxInt)
World.resetTipShown = true
} else {
SetMessage("GAME OVER", math.MaxInt)
}
}
func StartGame() {
if World.GameStarted {
return
}
World.GameStarted = true
}
func SetMessage(message string, duration int) {
World.MessageText = message
World.MessageVisible = true
World.MessageUpdated = true
World.MessageDuration = duration
World.MessageTicks = 0
}