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+.idea
+carotidartillery

LICENSE

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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -0,0 +1,26 @@
+# Carotid Artillery
+[![Donate](https://img.shields.io/liberapay/receives/rocketnine.space.svg?logo=liberapay)](https://liberapay.com/rocketnine.space)
+
+Top-down shooter
+
+**Note:** This game is in pre-alpha state. Here be dragons.
+
+This game was created during the [2021 Vampire Themed Game Jam](https://itch.io/jam/vampire-themed-game-jam-october-2021).
+
+## Play
+
+**Note:** You will need to install the dependencies listed for [your platform](https://github.com/hajimehoshi/ebiten/blob/main/README.md#platforms).
+
+Run the following command to build a `carotidartillery` executable:
+
+`go install code.rocketnine.space/tslocum/carotidartillery@latest`
+
+Run `~/go/bin/carotidartillery` to play.
+
+## Support
+
+Please share issues and suggestions [here](https://code.rocketnine.space/tslocum/carotidartillery/issues).
+
+## Dependencies
+
+- [ebiten](https://github.com/hajimehoshi/ebiten) - 2D game engine

character_spritesheet.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"embed"
+	"image"
+	_ "image/png"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+// CharacterSpriteSheet represents a collection of sprite images.
+type CharacterSpriteSheet struct {
+	Frame1 *ebiten.Image
+	Frame2 *ebiten.Image
+}
+
+//go:embed assets
+var assetsFS embed.FS
+
+// LoadCharacterSpriteSheet loads the embedded CharacterSpriteSheet.
+func LoadCharacterSpriteSheet() (*CharacterSpriteSheet, error) {
+	tileSize := 32
+
+	f, err := assetsFS.Open("assets/ojas-dungeon/character_run.png")
+	if err != nil {
+		return nil, err
+	}
+	img, _, err := image.Decode(f)
+	if err != nil {
+		return nil, err
+	}
+
+	sheet := ebiten.NewImageFromImage(img)
+
+	// spriteAt returns a sprite at the provided coordinates.
+	spriteAt := func(x, y int) *ebiten.Image {
+		return sheet.SubImage(image.Rect(x*tileSize, (y+1)*tileSize, (x+1)*tileSize, y*tileSize)).(*ebiten.Image)
+	}
+
+	// Populate CharacterSpriteSheet.
+	s := &CharacterSpriteSheet{}
+	s.Frame1 = spriteAt(0, 0)
+	s.Frame2 = spriteAt(0, 1)
+
+	return s, nil
+}

environment_spritesheet.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"image"
+	_ "image/png"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+// EnvironmentSpriteSheet represents a collection of sprite images.
+type EnvironmentSpriteSheet struct {
+	FloorA          *ebiten.Image
+	FloorB          *ebiten.Image
+	FloorC          *ebiten.Image
+	WallTop         *ebiten.Image
+	WallBottom      *ebiten.Image
+	WallBottomLeft  *ebiten.Image
+	WallBottomRight *ebiten.Image
+	WallLeft        *ebiten.Image
+	WallRight       *ebiten.Image
+	WallTopLeft     *ebiten.Image
+	WallTopRight    *ebiten.Image
+	WallPillar      *ebiten.Image
+}
+
+// LoadEnvironmentSpriteSheet loads the embedded EnvironmentSpriteSheet.
+func LoadEnvironmentSpriteSheet() (*EnvironmentSpriteSheet, error) {
+	tileSize := 32
+
+	f, err := assetsFS.Open("assets/sandstone-dungeon/Tiles-SandstoneDungeons.png")
+	if err != nil {
+		return nil, err
+	}
+	img, _, err := image.Decode(f)
+	if err != nil {
+		return nil, err
+	}
+
+	sheet := ebiten.NewImageFromImage(img)
+
+	// spriteAt returns a sprite at the provided coordinates.
+	spriteAt := func(x, y int) *ebiten.Image {
+		return sheet.SubImage(image.Rect(x*tileSize, (y+1)*tileSize, (x+1)*tileSize, y*tileSize)).(*ebiten.Image)
+	}
+
+	// Populate EnvironmentSpriteSheet.
+	s := &EnvironmentSpriteSheet{}
+	s.FloorA = spriteAt(3, 1)
+	s.FloorB = spriteAt(2, 0)
+	s.FloorC = spriteAt(2, 1)
+	s.WallTop = spriteAt(1, 2)
+	s.WallBottom = spriteAt(1, 6)
+	s.WallBottomLeft = spriteAt(2, 6)
+	s.WallBottomRight = spriteAt(0, 6)
+	s.WallLeft = spriteAt(2, 2)
+	s.WallRight = spriteAt(0, 2)
+	s.WallTopLeft = spriteAt(2, 3)
+	s.WallTopRight = spriteAt(0, 3)
+	s.WallPillar = spriteAt(8, 4)
+
+	return s, nil
+}

game.go

@@ -0,0 +1,408 @@
+package main
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"math"
+	"math/rand"
+	"os"
+	"time"
+
+	"github.com/hajimehoshi/ebiten/v2/audio"
+
+	"github.com/hajimehoshi/ebiten/v2/audio/mp3"
+
+	"golang.org/x/image/colornames"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
+)
+
+var spinner = []byte(`-\|/`)
+
+var bulletImage *ebiten.Image
+var flashImage *ebiten.Image
+
+type projectile struct {
+	x, y  float64
+	angle float64
+	speed float64
+	color color.Color
+}
+
+type creep struct {
+	x, y   float64
+	sprite *ebiten.Image
+}
+
+// game is an isometric demo game.
+type game struct {
+	w, h         int
+	currentLevel *Level
+
+	audioPlayer *audio.Player
+
+	player *gamePlayer
+
+	camScale   float64
+	camScaleTo float64
+
+	mousePanX, mousePanY int
+
+	spinnerIndex int
+
+	creeps []*creep
+
+	projectiles []*projectile
+
+	ojasSS *CharacterSpriteSheet
+
+	overlayImg *ebiten.Image
+	op         *ebiten.DrawImageOptions
+}
+
+const sampleRate = 48000
+
+// NewGame returns a new isometric demo game.
+func NewGame() (*game, error) {
+	l, err := NewLevel()
+	if err != nil {
+		return nil, fmt.Errorf("failed to create new level: %s", err)
+	}
+
+	p, err := NewPlayer()
+	if err != nil {
+		return nil, err
+	}
+
+	audioContext := audio.NewContext(sampleRate)
+
+	g := &game{
+		currentLevel: l,
+		camScale:     4,
+		camScaleTo:   4,
+		mousePanX:    math.MinInt32,
+		mousePanY:    math.MinInt32,
+		player:       p,
+		op:           &ebiten.DrawImageOptions{},
+	}
+
+	g.player.x = 7
+	g.player.y = 7
+
+	// Load SpriteSheets.
+	g.ojasSS, err = LoadCharacterSpriteSheet()
+	if err != nil {
+		return nil, fmt.Errorf("failed to load embedded spritesheet: %s", err)
+	}
+
+	f, err := assetsFS.Open("assets/weapons/bullet.png")
+	if err != nil {
+		return nil, err
+	}
+	img, _, err := image.Decode(f)
+	if err != nil {
+		return nil, err
+	}
+
+	bulletImage = ebiten.NewImageFromImage(img)
+
+	f, err = assetsFS.Open("assets/weapons/flash.png")
+	if err != nil {
+		return nil, err
+	}
+	img, _, err = image.Decode(f)
+	if err != nil {
+		return nil, err
+	}
+
+	flashImage = ebiten.NewImageFromImage(img)
+
+	f, err = assetsFS.Open("assets/audio/gunshot.mp3")
+	if err != nil {
+		return nil, err
+	}
+
+	gunshotSound, err := mp3.DecodeWithSampleRate(sampleRate, f)
+	if err != nil {
+		return nil, err
+	}
+	g.audioPlayer, err = audioContext.NewPlayer(gunshotSound)
+	if err != nil {
+		return nil, err
+	}
+
+	f, err = assetsFS.Open("assets/creeps/vampire.png")
+	if err != nil {
+		return nil, err
+	}
+	img, _, err = image.Decode(f)
+	if err != nil {
+		return nil, err
+	}
+
+	vampireImage := ebiten.NewImageFromImage(img)
+
+	for i := 0; i < 1000; i++ {
+		c := &creep{
+			x:      float64(1 + rand.Intn(64)),
+			y:      float64(1 + rand.Intn(64)),
+			sprite: vampireImage,
+		}
+		g.creeps = append(g.creeps, c)
+	}
+
+	ebiten.SetCursorShape(ebiten.CursorShapeCrosshair)
+
+	return g, nil
+}
+
+// Update reads current user input and updates the game state.
+func (g *game) Update() error {
+	if ebiten.IsWindowBeingClosed() {
+		g.exit()
+		return nil
+	}
+
+	// Update target zoom level.
+	var scrollY float64
+	if ebiten.IsKeyPressed(ebiten.KeyC) || ebiten.IsKeyPressed(ebiten.KeyPageDown) {
+		scrollY = -0.25
+	} else if ebiten.IsKeyPressed(ebiten.KeyE) || ebiten.IsKeyPressed(ebiten.KeyPageUp) {
+		scrollY = .25
+	} else {
+		_, scrollY = ebiten.Wheel()
+		if scrollY < -1 {
+			scrollY = -1
+		} else if scrollY > 1 {
+			scrollY = 1
+		}
+	}
+	g.camScaleTo += scrollY * (g.camScaleTo / 7)
+
+	// Clamp target zoom level.
+	if g.camScaleTo < 1 {
+		g.camScaleTo = 1
+	} else if g.camScaleTo > 4 {
+		g.camScaleTo = 4
+	}
+
+	// Smooth zoom transition.
+	div := 10.0
+	if g.camScaleTo > g.camScale {
+		g.camScale += (g.camScaleTo - g.camScale) / div
+	} else if g.camScaleTo < g.camScale {
+		g.camScale -= (g.camScale - g.camScaleTo) / div
+	}
+
+	// Pan camera via keyboard.
+	pan := 0.05
+	if ebiten.IsKeyPressed(ebiten.KeyLeft) || ebiten.IsKeyPressed(ebiten.KeyA) {
+		g.player.x -= pan
+	}
+	if ebiten.IsKeyPressed(ebiten.KeyRight) || ebiten.IsKeyPressed(ebiten.KeyD) {
+		g.player.x += pan
+	}
+	if ebiten.IsKeyPressed(ebiten.KeyDown) || ebiten.IsKeyPressed(ebiten.KeyS) {
+		g.player.y += pan
+	}
+	if ebiten.IsKeyPressed(ebiten.KeyUp) || ebiten.IsKeyPressed(ebiten.KeyW) {
+		g.player.y -= pan
+	}
+
+	// Clamp camera position.
+	if g.player.y < 0.6 {
+		g.player.y = 0.6
+	} else if g.player.y > float64(g.currentLevel.h)-1.4 {
+		g.player.y = float64(g.currentLevel.h) - 1.4
+	}
+
+	// Update player angle.
+	cx, cy := ebiten.CursorPosition()
+	g.player.angle = math.Atan2(float64(cy-g.h/2), float64(cx-g.w/2))
+
+	// Update boolets.
+	bulletHitThreshold := 0.5
+	removed := 0
+	for i, p := range g.projectiles {
+		p.x += math.Cos(p.angle) * p.speed
+		p.y += math.Sin(p.angle) * p.speed
+
+		for _, creep := range g.creeps {
+			dx, dy := p.x-creep.x, p.y-creep.y
+			if dx < 0 {
+				dx *= -1
+			}
+			if dy < 0 {
+				dy *= -1
+			}
+			if dx <= bulletHitThreshold && dy <= bulletHitThreshold {
+				creep.x = 1000
+				creep.y = 1000
+				g.projectiles = append(g.projectiles[:i-removed], g.projectiles[i-removed+1:]...)
+				removed++
+				break
+			}
+		}
+	}
+
+	// Fire boolets.
+	if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) && time.Since(g.player.weapon.lastFire) >= g.player.weapon.cooldown {
+		p := &projectile{
+			x:     g.player.x,
+			y:     g.player.y,
+			angle: g.player.angle,
+			speed: 0.35,
+			color: colornames.Yellow,
+		}
+		g.projectiles = append(g.projectiles, p)
+
+		v := 0.75 + (rand.Float64() / 4)
+		v = 1.0 // TODO
+
+		g.player.weapon.lastFire = time.Now()
+		g.audioPlayer.SetVolume(v)
+		g.audioPlayer.Pause()
+		g.audioPlayer.Rewind()
+		g.audioPlayer.Play()
+	}
+
+	return nil
+}
+
+func (g *game) levelCoordinatesToScreen(x, y float64) (float64, float64) {
+	px, py := g.tilePosition(g.player.x, g.player.y)
+	py *= -1
+	return ((x - px) * g.camScale) + float64(g.w/2.0), ((y + py) * g.camScale) + float64(g.h/2.0)
+}
+
+func (g *game) screenCoordinatesToLevel(x, y float64) (float64, float64) {
+	// TODO reverse
+	px, py := g.tilePosition(g.player.x, g.player.y)
+	py *= -1
+	return ((x - px) * g.camScale) + float64(g.w/2.0), ((y + py) * g.camScale) + float64(g.h/2.0)
+}
+
+// Draw draws the game on the screen.
+func (g *game) Draw(screen *ebiten.Image) {
+	// Render level.
+	drawn := g.renderLevel(screen)
+
+	// Print game info.
+	g.overlayImg.Clear()
+	ebitenutil.DebugPrint(g.overlayImg, fmt.Sprintf("FPS  %0.0f\nTPS  %0.0f\nSPR  %d\nSCA  %0.2f\nPOS  %0.0f,%0.0f", ebiten.CurrentFPS(), ebiten.CurrentTPS(), drawn, g.camScale, g.player.x, g.player.y))
+	g.op.GeoM.Reset()
+	g.op.GeoM.Translate(3, 0)
+	g.op.GeoM.Scale(2, 2)
+	screen.DrawImage(g.overlayImg, g.op)
+}
+
+// Layout is called when the game's layout changes.
+func (g *game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	s := ebiten.DeviceScaleFactor()
+	w, h := int(s*float64(outsideWidth)), int(s*float64(outsideHeight))
+	if w != g.w || h != g.h {
+		g.w, g.h = w, h
+
+		debugBox := image.NewRGBA(image.Rect(0, 0, g.w, 200))
+		g.overlayImg = ebiten.NewImageFromImage(debugBox)
+	}
+	if g.player.weapon.spriteFlipped == nil {
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Scale(-1, 1)
+		op.GeoM.Translate(32, 0)
+		spriteFlipped := ebiten.NewImageFromImage(g.player.weapon.sprite)
+		spriteFlipped.Clear()
+		spriteFlipped.DrawImage(g.player.weapon.sprite, op)
+		g.player.weapon.spriteFlipped = spriteFlipped
+	}
+	return g.w, g.h
+}
+
+// tilePosition transforms X,Y coordinates into tile positions.
+func (g *game) tilePosition(x, y float64) (float64, float64) {
+	tileSize := float64(g.currentLevel.tileSize)
+	return x * tileSize, y * tileSize
+}
+
+func (g *game) renderSprite(x float64, y float64, offsetx float64, offsety float64, angle float64, sprite *ebiten.Image, target *ebiten.Image) int {
+	x, y = g.tilePosition(x, y)
+
+	// Skip drawing off-screen tiles.
+	drawX, drawY := g.levelCoordinatesToScreen(x, y)
+	padding := float64(g.currentLevel.tileSize) * 2
+	if drawX+padding < 0 || drawY+padding < 0 || drawX > float64(g.w)+padding || drawY > float64(g.h)+padding {
+		return 0
+	}
+
+	g.op.GeoM.Reset()
+	// Rotate
+	g.op.GeoM.Translate(-16+offsetx, -16+offsety)
+	g.op.GeoM.Rotate(angle)
+	// Move to current isometric position.
+	g.op.GeoM.Translate(x, y)
+	// Translate camera position.
+	px, py := g.tilePosition(g.player.x, g.player.y)
+	g.op.GeoM.Translate(-px, -py)
+	// Zoom.
+	g.op.GeoM.Scale(g.camScale, g.camScale)
+	// Center.
+	g.op.GeoM.Translate(float64(g.w/2.0), float64(g.h/2.0))
+
+	target.DrawImage(sprite, g.op)
+	return 1
+}
+
+// renderLevel draws the current Level on the screen.
+func (g *game) renderLevel(screen *ebiten.Image) int {
+	var drawn int
+
+	var t *Tile
+	for y := 0; y < g.currentLevel.h; y++ {
+		for x := 0; x < g.currentLevel.w; x++ {
+			t = g.currentLevel.tiles[y][x]
+			if t == nil {
+				continue // No tile at this position.
+			}
+
+			for i := range t.sprites {
+				drawn += g.renderSprite(float64(x), float64(y), 0, 0, 0, t.sprites[i], screen)
+			}
+		}
+	}
+
+	for _, c := range g.creeps {
+		drawn += g.renderSprite(c.x, c.y, 0, 0, 0, c.sprite, screen)
+	}
+
+	for _, p := range g.projectiles {
+		drawn += g.renderSprite(p.x, p.y, 0, 0, p.angle, bulletImage, screen)
+	}
+
+	playerSprite := g.ojasSS.Frame1
+	playerAngle := g.player.angle
+	weaponSprite := g.player.weapon.spriteFlipped
+	mul := float64(1)
+	if g.player.angle > math.Pi/2 || g.player.angle < -1*math.Pi/2 {
+		playerSprite = g.ojasSS.Frame2
+		playerAngle = playerAngle - math.Pi
+		weaponSprite = g.player.weapon.sprite
+		mul = -1
+	}
+	drawn += g.renderSprite(g.player.x, g.player.y, 0, 0, playerAngle, playerSprite, screen)
+	if g.player.weapon != nil {
+		drawn += g.renderSprite(g.player.x, g.player.y, 11*mul, 9, playerAngle, weaponSprite, screen)
+	}
+
+	flashDuration := 40 * time.Millisecond
+	if time.Since(g.player.weapon.lastFire) < flashDuration {
+		drawn += g.renderSprite(g.player.x, g.player.y, 39, -1, g.player.angle, flashImage, screen)
+	}
+
+	return drawn
+}
+
+func (g *game) exit() {
+	os.Exit(0)
+}

go.mod

@@ -0,0 +1,19 @@
+module code.rocketnine.space/tslocum/carotidartillery
+
+go 1.17
+
+require (
+	github.com/hajimehoshi/ebiten/v2 v2.3.0-alpha.0.20211002105934-2fd97767ff1d
+	golang.org/x/image v0.0.0-20210628002857-a66eb6448b8d
+)
+
+require (
+	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20210727001814-0db043d8d5be // indirect
+	github.com/hajimehoshi/go-mp3 v0.3.2 // indirect
+	github.com/hajimehoshi/oto/v2 v2.1.0-alpha.2 // indirect
+	github.com/jezek/xgb v0.0.0-20210312150743-0e0f116e1240 // indirect
+	golang.org/x/exp v0.0.0-20210916165020-5cb4fee858ee // indirect
+	golang.org/x/mobile v0.0.0-20210924032853-1c027f395ef7 // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/sys v0.0.0-20211004093028-2c5d950f24ef // indirect
+)

go.sum

@@ -0,0 +1,442 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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