easings examples added

examples/shapes/easings_ball_anim/main.go

@@ -0,0 +1,86 @@
+package main
+
+import (
+	ez "github.com/gen2brain/raylib-go/easings"
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(800)
+	screenHeight := int32(450)
+
+	rl.SetConfigFlags(rl.FlagMsaa4xHint)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shapes] example - easings ball anim")
+
+	ballPosX := -100
+	ballRadius := 20
+	ballAlpha := float32(0)
+
+	state := 0
+	frames := 0
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		if state == 0 {
+
+			frames++
+			ballPosX = int(ez.ElasticOut(float32(frames), -100, float32(screenWidth/2)+100, 100))
+
+			if frames >= 100 {
+				frames = 0
+				state = 1
+			}
+
+		} else if state == 1 {
+			frames++
+			ballRadius = int(ez.ElasticIn(float32(frames), 20, 500, 150))
+
+			if frames >= 150 {
+				frames = 0
+				state = 2
+			}
+		} else if state == 2 {
+			frames++
+			ballAlpha = ez.CubicOut(float32(frames), 0, 1, 150)
+
+			if frames >= 150 {
+				frames = 0
+				state = 3
+			}
+		} else if state == 3 {
+			if rl.IsKeyPressed(rl.KeyEnter) {
+				ballPosX = -100
+				ballRadius = 20
+				ballAlpha = 0
+				state = 0
+			}
+
+		}
+
+		if rl.IsKeyPressed(rl.KeyR) {
+			frames = 0
+		}
+
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.RayWhite)
+
+		if state >= 2 {
+			rl.DrawRectangle(0, 0, screenWidth, screenHeight, rl.Green)
+		}
+
+		rl.DrawCircle(int32(ballPosX), 200, float32(ballRadius), rl.Fade(rl.Red, 1-ballAlpha))
+
+		if state == 3 {
+			textlen := rl.MeasureText("press ENTER to replay", 20)
+			rl.DrawText("press ENTER to replay", (screenWidth/2)-textlen/2, 200, 20, rl.Black)
+		}
+
+		rl.EndDrawing()
+
+	}
+
+	rl.CloseWindow()
+}