add more shapes examples

examples/shapes/following_eyes/main.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"math"
+
+	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 - following eyes")
+
+	scleraLpos := rl.NewVector2(float32(screenWidth/2)-100, float32(screenHeight/2))
+	scleraRpos := rl.NewVector2(float32(screenWidth/2)+100, float32(screenHeight/2))
+	scleraRad := 80
+
+	irisLpos := rl.NewVector2(float32(screenWidth/2)-100, float32(screenHeight/2))
+	irisRpos := rl.NewVector2(float32(screenWidth/2)+100, float32(screenHeight/2))
+	irisRad := 24
+
+	angle := float32(0)
+	dx, dy, dxx, dyy := float32(0), float32(0), float32(0), float32(0)
+
+	rl.SetTargetFPS(60)
+
+	rl.SetMousePosition(0, 0)
+
+	for !rl.WindowShouldClose() {
+
+		irisLpos = rl.GetMousePosition()
+		irisRpos = rl.GetMousePosition()
+
+		if !rl.CheckCollisionPointCircle(irisLpos, scleraLpos, float32(scleraRad-20)) {
+
+			dx = irisLpos.X - scleraLpos.X
+			dy = irisLpos.Y - scleraLpos.Y
+
+			angle = float32(math.Atan2(float64(dy), float64(dx)))
+
+			dxx = (float32(scleraRad-irisRad) * float32(math.Cos(float64(angle))))
+			dyy = (float32(scleraRad-irisRad) * float32(math.Sin(float64(angle))))
+
+			irisLpos.X = scleraLpos.X + dxx
+			irisLpos.Y = scleraLpos.Y + dyy
+
+		}
+
+		if !rl.CheckCollisionPointCircle(irisRpos, scleraRpos, float32(scleraRad)-20) {
+			dx = irisRpos.X - scleraRpos.X
+			dy = irisRpos.Y - scleraRpos.Y
+
+			angle = float32(math.Atan2(float64(dy), float64(dx)))
+
+			dxx = (float32(scleraRad-irisRad) * float32(math.Cos(float64(angle))))
+			dyy = (float32(scleraRad-irisRad) * float32(math.Sin(float64(angle))))
+
+			irisRpos.X = scleraRpos.X + dxx
+			irisRpos.Y = scleraRpos.Y + dyy
+
+		}
+
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.DrawCircleV(scleraLpos, float32(scleraRad), rl.LightGray)
+		rl.DrawCircleV(irisLpos, float32(irisRad), rl.Red)
+		rl.DrawCircleV(irisLpos, 10, rl.Black)
+
+		rl.DrawCircleV(scleraRpos, float32(scleraRad), rl.LightGray)
+		rl.DrawCircleV(irisRpos, float32(irisRad), rl.Orange)
+		rl.DrawCircleV(irisRpos, 10, rl.Black)
+
+		rl.DrawFPS(screenWidth-100, 10)
+
+		rl.EndDrawing()
+
+	}
+
+	rl.CloseWindow()
+}