organização de código

movementPatterns.go

@@ -0,0 +1,138 @@
+package main
+
+import (
+	"math"
+
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+type movementPattern func(*enemy) *enemy
+
+type patternDuration struct {
+	duration duration
+	move     movementPattern
+}
+
+type statePipeline []patternDuration
+
+func shootStill() movementPattern {
+	return func(e *enemy) *enemy {
+		if e.shoot != nil {
+			e.shoot(e)
+		}
+		return e
+	}
+}
+
+func (sp statePipeline) MovementPattern(g *game) movementPattern {
+	state := -1
+	t := newTimer(0)
+	return func(e *enemy) *enemy {
+		if !t.isTimeout() {
+			t.tick(g)
+		} else if state < len(sp)-1 {
+			state++
+			t = newTimer(sp[state].duration)
+		}
+		sp[state].move(e)
+		return e
+	}
+}
+
+func horizonalPattern(g *game) movementPattern {
+	direction := 1
+
+	return func(e *enemy) *enemy {
+		if e.shoot != nil {
+			e.shoot(e)
+		}
+
+		delta := rl.Vector2{
+			X: 400,
+			Y: 0,
+		}
+
+		if e.pos.X < e.hitBoxRadius || e.pos.X > float32(g.arenaWidth-int32(e.hitBoxRadius)) {
+			direction = -direction
+		}
+
+		e.pos = rl.Vector2Add(
+			e.pos,
+			rl.Vector2Scale(
+				rl.Vector2{X: float32(direction) * delta.X, Y: delta.Y},
+				rl.GetFrameTime()*g.gameSpeed,
+			),
+		)
+		return e
+	}
+}
+
+func descentMove(g *game, y0, y1 float32, d duration) movementPattern {
+	t := newTimer(d)
+	return func(e *enemy) *enemy {
+
+		if e.shoot != nil {
+			e.shoot(e)
+		}
+
+		if !t.isTimeout() {
+			t.tick(g)
+		} else {
+			return e
+		}
+
+		e.pos.Y = lerp(y0, y1, easeInOutSine(t.unit()))
+		return e
+	}
+}
+
+func sineDescentMove(g *game, y0, y1 float32, d duration) movementPattern {
+	t := newTimer(d)
+	return func(e *enemy) *enemy {
+
+		if e.shoot != nil {
+			e.shoot(e)
+		}
+
+		if !t.isTimeout() {
+			t.tick(g)
+		} else {
+			return e
+		}
+
+		e.pos.Y = lerp(y0, y1, easeInOutSine(t.unit()))
+		e.pos.X += float32(math.Sin(rl.GetTime() * 5 * float64(g.gameSpeed)))
+
+		return e
+	}
+}
+
+func sineHorizonalPattern(g *game, offset float64) movementPattern {
+	direction := 1
+
+	return func(e *enemy) *enemy {
+		if e.shoot != nil {
+			e.shoot(e)
+		}
+
+		sine := math.Sin(rl.GetTime()*5*float64(g.gameSpeed)+offset) * 150
+
+		delta := rl.Vector2{
+			X: 400,
+			Y: float32(sine),
+		}
+
+		if e.pos.X < e.hitBoxRadius || e.pos.X > float32(g.arenaWidth-int32(e.hitBoxRadius)) {
+			direction = -direction
+		}
+
+		e.pos = rl.Vector2Add(
+			e.pos,
+			rl.Vector2Scale(
+				rl.Vector2{X: float32(direction) * delta.X, Y: delta.Y},
+				rl.GetFrameTime()*g.gameSpeed,
+			),
+		)
+		return e
+	}
+}