add more shapes examples

examples/shapes/bouncing_ball/main.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(1280)
+	screenHeight := int32(720)
+
+	rl.SetConfigFlags(rl.FlagMsaa4xHint)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shapes] example - bouncing ball")
+
+	ballPos := rl.NewVector2(float32(screenWidth)/2, float32(screenHeight)/2)
+	ballSpeed := rl.NewVector2(5, 4)
+	ballRadius := 20
+
+	pause := false
+	frames := 0
+
+	rl.SetTargetFPS(60)
+
+	rl.SetMousePosition(0, 0)
+
+	for !rl.WindowShouldClose() {
+
+		if rl.IsKeyPressed(rl.KeySpace) {
+			pause = !pause
+		}
+
+		if !pause {
+			ballPos.X += ballSpeed.X
+			ballPos.Y += ballSpeed.Y
+			if ballPos.X >= float32(screenWidth)-float32(ballRadius) || ballPos.X <= float32(ballRadius) {
+				ballSpeed.X *= -1
+			}
+			if ballPos.Y >= float32(screenHeight)-float32(ballRadius) || ballPos.Y <= float32(ballRadius) {
+				ballSpeed.Y *= -1
+			}
+		} else {
+			frames++
+		}
+
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.DrawText("SPACE key to pause", 10, 10, 20, rl.Black)
+
+		rl.DrawCircleV(ballPos, float32(ballRadius), rl.Red)
+
+		if pause && (frames/30)%2 == 0 {
+			rl.DrawText("PAUSED", 10, screenHeight-40, 30, rl.Black)
+		}
+
+		rl.DrawFPS(screenWidth-100, 10)
+
+		rl.EndDrawing()
+
+	}
+
+	rl.CloseWindow()
+}