easings examples added

examples/shapes/easings_box_anim/main.go

@@ -0,0 +1,99 @@
+package main
+
+import (
+	ez "github.com/gen2brain/raylib-go/easings"
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+var (
+	fps = int32(60)
+)
+
+const (
+	screenWidth  = int32(800)
+	screenHeight = int32(450)
+)
+
+func main() {
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shapes] example - easings box anim")
+
+	rec := rl.NewRectangle(float32(screenWidth/2), -100, 100, 100)
+	rotation := float32(0)
+	alpha := float32(1)
+
+	state := 0
+	frames := 0
+
+	rl.SetTargetFPS(fps)
+
+	for !rl.WindowShouldClose() {
+
+		switch state {
+		case 0:
+			frames++
+
+			rec.Y = ez.ElasticOut(float32(frames), -100, float32(screenHeight/2)+100, 120)
+
+			if frames >= 120 {
+				frames = 0
+				state = 1
+			}
+
+		case 1:
+			frames++
+			rec.Height = ez.BounceOut(float32(frames), 100, -90, 120)
+			rec.Width = ez.BounceOut(float32(frames), 100, float32(screenWidth), 120)
+
+			if frames >= 120 {
+				frames++
+				state = 2
+			}
+		case 2:
+			frames++
+			rotation = ez.QuadOut(float32(frames), 0, 270, 240)
+			if frames >= 240 {
+				frames = 0
+				state = 3
+			}
+		case 3:
+			frames++
+			rec.Height = ez.CircOut(float32(frames), 10, float32(screenWidth), 120)
+			if frames >= 120 {
+				frames = 0
+				state = 4
+			}
+
+		case 4:
+			frames++
+			alpha = ez.SineOut(float32(frames), 1, -1, 160)
+			if frames >= 160 {
+				frames = 0
+				state = 5
+			}
+		default:
+			break
+		}
+
+		if rl.IsKeyPressed(rl.KeySpace) {
+			rec = rl.NewRectangle(float32(screenWidth/2), -100, 100, 100)
+			rotation = 0
+			alpha = 1
+			state = 0
+			frames = 0
+		}
+
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.DrawRectanglePro(rec, rl.NewVector2(rec.Width/2, rec.Height/2), rotation, rl.Fade(rl.Black, alpha))
+
+		if state == 5 {
+			txtlen := rl.MeasureText("SPACE to replay", 20)
+			rl.DrawText("SPACE to replay", (screenWidth/2)-txtlen/2, 200, 20, rl.Black)
+		}
+		rl.EndDrawing()
+	}
+
+	rl.CloseWindow()
+}