Added a rain layer for atmosphere.

gameelement/rainlayer.go

@@ -0,0 +1,149 @@
+package gameelement
+
+import (
+	"math/rand/v2"
+	"mover/elements"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type RainLayer struct {
+	Sprite       *ebiten.Image
+	lastInputs   gamedata.GameInputs
+	raindrops    []*elements.RainDrop
+	nextsplashes []gamedata.Coordinates
+	rainsplashes []*elements.RainSplash
+	dimensions   gamedata.Area
+	cycle        int
+}
+
+func NewRainLayer(a gamedata.Area) *RainLayer {
+	rl := &RainLayer{
+		Sprite:     ebiten.NewImage(a.Width, a.Height),
+		dimensions: a,
+	}
+
+	for i := 0; i < 50; i++ {
+		nrd := elements.NewRainDrop()
+		nrd.SetPosition(gamedata.Coordinates{X: rand.Float64() * float64(a.Width), Y: rand.Float64() * float64(a.Height)})
+		rl.raindrops = append(rl.raindrops, nrd)
+	}
+
+	for i := 0; i < 50; i++ {
+		nrd := elements.NewRainSplash()
+		nrd.SetPosition(gamedata.Coordinates{X: rand.Float64() * float64(a.Width), Y: rand.Float64() * float64(a.Height)})
+		rl.rainsplashes = append(rl.rainsplashes, nrd)
+	}
+	return rl
+}
+
+func (r *RainLayer) SetInputs(inputs gamedata.GameInputs) {
+	r.lastInputs = inputs
+}
+
+func (r *RainLayer) Update() error {
+
+	r.UpdateDrops()
+	r.UpdateSplashes()
+
+	r.cycle++
+	return nil
+}
+
+func (r *RainLayer) Draw(drawimg *ebiten.Image) {
+	r.Sprite.Clear()
+
+	for _, drop := range r.raindrops {
+		drop.Draw()
+
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(drop.GetPosition().X, drop.GetPosition().Y)
+		op.ColorScale.ScaleAlpha(0.5)
+		r.Sprite.DrawImage(drop.Sprite, op)
+	}
+
+	for _, drop := range r.rainsplashes {
+		drop.Draw()
+
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(drop.GetPosition().X, drop.GetPosition().Y)
+		op.ColorScale.ScaleAlpha(0.5)
+		r.Sprite.DrawImage(drop.Sprite, op)
+	}
+
+	drawimg.DrawImage(r.Sprite, nil)
+
+}
+
+func (r *RainLayer) Initialize() {
+
+}
+
+func (r *RainLayer) RegisterEvents(e gamedata.GameEvent, f func()) {
+
+}
+
+func (r *RainLayer) UpdateDrops() {
+	i := 0
+	for _, drop := range r.raindrops {
+		drop.Update()
+
+		if !drop.Expired() {
+			r.raindrops[i] = drop
+			i++
+		} else {
+			r.nextsplashes = append(r.nextsplashes, drop.GetPosition())
+		}
+	}
+
+	var j int = i
+	var newdrops int = 0
+	for ; j < len(r.raindrops); j++ {
+		r.raindrops[j] = nil
+	}
+	newdrops = len(r.raindrops) - i
+	r.raindrops = r.raindrops[:i]
+
+	for k := 0; k < newdrops; k++ {
+		nrd := elements.NewRainDrop()
+		nrd.SetPosition(gamedata.Coordinates{X: rand.Float64() * float64(r.dimensions.Width), Y: rand.Float64() * float64(r.dimensions.Height)})
+		r.raindrops = append(r.raindrops, nrd)
+	}
+}
+
+func (r *RainLayer) UpdateSplashes() {
+	i := 0
+	for _, drop := range r.rainsplashes {
+		drop.Update()
+
+		if !drop.Expired() {
+			r.rainsplashes[i] = drop
+			i++
+		}
+	}
+
+	var j int = i
+	//var newdrops int = 0
+	for ; j < len(r.rainsplashes); j++ {
+		r.rainsplashes[j] = nil
+	}
+	//newdrops = len(r.rainsplashes) - i
+	r.rainsplashes = r.rainsplashes[:i]
+
+	/*
+		for k := 0; k < newdrops; k++ {
+			nrd := elements.NewRainSplash()
+			nrd.SetPosition(gamedata.Coordinates{X: rand.Float64() * float64(r.dimensions.Width), Y: rand.Float64() * float64(r.dimensions.Height)})
+			r.rainsplashes = append(r.rainsplashes, nrd)
+		}*/
+
+	for _, splashloc := range r.nextsplashes {
+		nrd := elements.NewRainSplash()
+		nrd.SetPosition(splashloc)
+		r.rainsplashes = append(r.rainsplashes, nrd)
+	}
+
+	r.nextsplashes = r.nextsplashes[:0]
+
+}