You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
105 lines
2.8 KiB
Go
105 lines
2.8 KiB
Go
//go:build example
|
|
// +build example
|
|
|
|
package system
|
|
|
|
import (
|
|
"math"
|
|
"time"
|
|
|
|
"code.rocketnine.space/tslocum/gohan"
|
|
"code.rocketnine.space/tslocum/gohan/examples/twinstick/component"
|
|
"code.rocketnine.space/tslocum/gohan/examples/twinstick/entity"
|
|
"github.com/hajimehoshi/ebiten/v2"
|
|
)
|
|
|
|
func angle(x1, y1, x2, y2 float64) float64 {
|
|
return math.Atan2(y1-y2, x1-x2)
|
|
}
|
|
|
|
type fireInputSystem struct {
|
|
player gohan.Entity
|
|
}
|
|
|
|
func NewFireInputSystem(player gohan.Entity) *fireInputSystem {
|
|
return &fireInputSystem{
|
|
player: player,
|
|
}
|
|
}
|
|
|
|
func (_ *fireInputSystem) Components() []gohan.ComponentID {
|
|
return []gohan.ComponentID{
|
|
component.PositionComponentID,
|
|
component.WeaponComponentID,
|
|
}
|
|
}
|
|
|
|
func (s *fireInputSystem) fire(weapon *component.WeaponComponent, position *component.PositionComponent, fireAngle float64) {
|
|
if time.Since(weapon.LastFire) < weapon.FireRate {
|
|
return
|
|
}
|
|
|
|
weapon.Ammo--
|
|
weapon.LastFire = time.Now()
|
|
|
|
speedX := math.Cos(fireAngle) * -weapon.BulletSpeed
|
|
speedY := math.Sin(fireAngle) * -weapon.BulletSpeed
|
|
|
|
bullet := entity.NewBullet(position.X, position.Y, speedX, speedY)
|
|
_ = bullet
|
|
}
|
|
|
|
func (s *fireInputSystem) Update(ctx *gohan.Context) error {
|
|
position := component.Position(ctx)
|
|
weapon := component.Weapon(ctx)
|
|
|
|
if weapon.Ammo <= 0 {
|
|
return nil
|
|
}
|
|
|
|
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
|
|
cursorX, cursorY := ebiten.CursorPosition()
|
|
fireAngle := angle(position.X, position.Y, float64(cursorX), float64(cursorY))
|
|
|
|
s.fire(weapon, position, fireAngle)
|
|
}
|
|
|
|
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonRight) {
|
|
cursorX, cursorY := ebiten.CursorPosition()
|
|
fireAngle := angle(position.X, position.Y, float64(cursorX), float64(cursorY))
|
|
|
|
const div = 5
|
|
weapon.BulletSpeed /= div
|
|
for i := 0.0; i < 24; i++ {
|
|
s.fire(weapon, position, fireAngle+i*(math.Pi/12))
|
|
weapon.LastFire = time.Time{}
|
|
}
|
|
weapon.BulletSpeed *= div
|
|
}
|
|
|
|
switch {
|
|
case ebiten.IsKeyPressed(ebiten.KeyLeft) && ebiten.IsKeyPressed(ebiten.KeyUp):
|
|
s.fire(weapon, position, math.Pi/4)
|
|
case ebiten.IsKeyPressed(ebiten.KeyLeft) && ebiten.IsKeyPressed(ebiten.KeyDown):
|
|
s.fire(weapon, position, -math.Pi/4)
|
|
case ebiten.IsKeyPressed(ebiten.KeyRight) && ebiten.IsKeyPressed(ebiten.KeyUp):
|
|
s.fire(weapon, position, math.Pi*.75)
|
|
case ebiten.IsKeyPressed(ebiten.KeyRight) && ebiten.IsKeyPressed(ebiten.KeyDown):
|
|
s.fire(weapon, position, -math.Pi*.75)
|
|
case ebiten.IsKeyPressed(ebiten.KeyLeft):
|
|
s.fire(weapon, position, 0)
|
|
case ebiten.IsKeyPressed(ebiten.KeyRight):
|
|
s.fire(weapon, position, math.Pi)
|
|
case ebiten.IsKeyPressed(ebiten.KeyUp):
|
|
s.fire(weapon, position, math.Pi/2)
|
|
case ebiten.IsKeyPressed(ebiten.KeyDown):
|
|
s.fire(weapon, position, -math.Pi/2)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (_ *fireInputSystem) Draw(ctx *gohan.Context, _ *ebiten.Image) error {
|
|
return gohan.ErrSystemWithoutDraw
|
|
}
|