Playing around with a laser weapon.

elements/splash.go

@@ -0,0 +1,92 @@
+package elements
+
+import (
+	"math"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+const (
+	SPLASH_DIM          = 128
+	SPLASH_ELEMS        = 10
+	SPLASH_PRIMARY_SIZE = 46
+)
+
+type Splash struct {
+	Sprite   *ebiten.Image
+	position gamedata.Coordinates
+	cycle    int
+	opacity  float32
+}
+
+func NewSplash() *Splash {
+	sp := &Splash{
+		Sprite:  ebiten.NewImage(SPLASH_DIM, SPLASH_DIM),
+		cycle:   0,
+		opacity: 1,
+	}
+	return sp
+}
+
+func (sp *Splash) Update() error {
+	sp.cycle++
+
+	sp.opacity = sp.opacity - float32(sp.cycle)/(60*60)
+
+	return nil
+}
+
+func (sp *Splash) Draw() {
+	sp.Sprite.Clear()
+
+	/*
+		for i := SPLASH_ELEMS; i > 0; i-- {
+
+			percent := float64(i) / SPLASH_ELEMS
+
+			dx := 1 / percent * math.Cos(float64(sp.cycle)/(math.Pi*2))
+			dy := -float64(i - SPLASH_ELEMS) //math.Sin(float64(sp.cycle) / (math.Pi * 2))
+
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Translate(-SPLASH_DIM/2, -SPLASH_DIM/2)
+			op.GeoM.Scale(percent, percent)
+			//op.GeoM.Rotate(-(float64(sp.cycle - i*30)) / (math.Pi * 2))
+			op.GeoM.Translate(SPLASH_DIM/2+dx, SPLASH_DIM/2+dy)
+			//op.ColorScale.ScaleAlpha(float32(percent))
+			sp.Sprite.DrawImage(assets.ImageBank[assets.Splash], op)
+		}*/
+
+	for i := 0; i < SPLASH_ELEMS; i++ {
+
+		percent := float64(SPLASH_ELEMS-i) / SPLASH_ELEMS
+
+		dy := -float64(i)*4 - float64(sp.cycle)/60
+		dx := 2 / percent * math.Cos(float64(sp.cycle-i*10)/(math.Pi*2))
+
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(-48/2, -48/2)
+		op.GeoM.Scale(percent, percent)
+		op.GeoM.Rotate(-float64(sp.cycle) / (math.Pi * 4))
+		op.GeoM.Translate(SPLASH_DIM/2, SPLASH_DIM/2)
+		op.GeoM.Translate(dx, dy)
+
+		op.ColorScale.ScaleAlpha(sp.opacity)
+
+		sp.Sprite.DrawImage(assets.ImageBank[assets.Splash], op)
+	}
+
+}
+
+func (sp *Splash) GetPosition() gamedata.Coordinates {
+	return sp.position
+}
+
+func (sp *Splash) SetPosition(pos gamedata.Coordinates) {
+	sp.position = pos
+}
+
+func (sp *Splash) GetAlpha() float32 {
+	return sp.opacity
+}