porting new examples to Go from https://www.raylib.com/examples.html

examples/shapes/collision area/main.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"fmt"
+
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+var (
+	screenWidth  = int32(1280)
+	screenHeight = int32(720)
+
+	pause     = false
+	collision = false
+
+	boxCollision     = rl.Rectangle{}
+	screenUpperLimit = float32(40)
+	boxAspeedX       = float32(4)
+)
+
+func main() {
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shapes] example - collision area")
+
+	rl.SetTargetFPS(60)
+
+	boxA := rl.NewRectangle(10, float32(rl.GetScreenHeight()/2)-50, 200, 100)
+	boxB := rl.NewRectangle(float32(rl.GetScreenWidth()/2)-30, float32(rl.GetScreenHeight()/2)-30, 60, 60)
+
+	for !rl.WindowShouldClose() {
+
+		mousePos := rl.GetMousePosition()
+
+		if !pause {
+			boxA.X += boxAspeedX
+		}
+		if boxA.X+boxA.Width >= float32(rl.GetScreenWidth()) || boxA.X <= 0 {
+			boxAspeedX *= -1
+		}
+
+		boxB.X = mousePos.X - boxB.Width/2
+		boxB.Y = mousePos.Y - boxB.Height/2
+
+		if boxB.X+boxB.Width >= float32(rl.GetScreenWidth()) {
+			boxB.X = float32(rl.GetScreenWidth()) - boxB.Width
+		} else if boxB.X <= 0 {
+			boxB.X = 0
+		}
+
+		if boxB.Y+boxB.Height >= float32(rl.GetScreenHeight()) {
+			boxB.Y = float32(rl.GetScreenHeight()) - boxB.Height
+		} else if boxB.X <= screenUpperLimit {
+			boxB.Y = screenUpperLimit
+		}
+
+		collision := rl.CheckCollisionRecs(boxA, boxB)
+
+		if collision {
+			boxCollision = rl.GetCollisionRec(boxA, boxB)
+		}
+
+		if rl.IsKeyPressed(rl.KeySpace) {
+			pause = !pause
+		}
+
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.RayWhite)
+
+		if collision {
+			rl.DrawRectangle(0, 0, screenWidth, int32(screenUpperLimit), rl.Red)
+			rl.DrawRectangleRec(boxCollision, rl.Lime)
+			rl.DrawText("COLLISION", int32(rl.GetScreenWidth()/2)-(rl.MeasureText("COLLISION", 20)/2), int32(screenUpperLimit/2)-10, 20, rl.Black)
+			rl.DrawText("Collision Area: "+fmt.Sprint(boxCollision.Width*boxCollision.Height), int32(rl.GetScreenWidth()/2)-100, int32(screenUpperLimit+10), 20, rl.Black)
+		} else {
+			rl.DrawRectangle(0, 0, screenWidth, int32(screenUpperLimit), rl.Black)
+		}
+
+		rl.DrawRectangleRec(boxA, rl.Orange)
+		rl.DrawRectangleRec(boxB, rl.Blue)
+
+		rl.DrawText("Press SPACE to PAUSE/RESUME", 20, int32(rl.GetScreenHeight())-35, 20, rl.Black)
+
+		rl.EndDrawing()
+
+	}
+
+	rl.CloseWindow()
+}

examples/shapes/rectangle scaling/main.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+var (
+	mouseScaleMarkSize              = float32(12)
+	rec                             = rl.NewRectangle(100, 100, 200, 80)
+	mouseScaleReady, MouseScaleMode = false, false
+)
+
+func main() {
+	screenWidth := int32(1280)
+	screenHeight := int32(720)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shapes] example - rectangle scaling mouse")
+
+	rl.SetTargetFPS(60)
+
+	rl.SetMousePosition(0, 0)
+
+	for !rl.WindowShouldClose() {
+
+		mousePos := rl.GetMousePosition()
+
+		if rl.CheckCollisionPointRec(mousePos, rl.NewRectangle(rec.X+rec.Width-mouseScaleMarkSize, rec.Y+rec.Height-mouseScaleMarkSize, mouseScaleMarkSize, mouseScaleMarkSize)) {
+			mouseScaleReady = true
+			if rl.IsMouseButtonPressed(rl.MouseLeftButton) {
+				MouseScaleMode = true
+			}
+		} else {
+			mouseScaleReady = false
+		}
+
+		if MouseScaleMode {
+
+			mouseScaleReady = true
+			rec.Width = mousePos.X - rec.X
+			rec.Height = mousePos.Y - rec.Y
+
+			// CHECK MIN MAX REC SIZES
+			if rec.Width < mouseScaleMarkSize {
+				rec.Width = rec.Width
+			}
+			if rec.Height < mouseScaleMarkSize {
+				rec.Height = rec.Width
+			}
+			if rec.Width > (float32(rl.GetScreenWidth()) - rec.X) {
+				rec.Width = float32(rl.GetScreenWidth()) - rec.X
+			}
+			if rec.Height > (float32(rl.GetScreenHeight()) - rec.Y) {
+				rec.Height = float32(rl.GetScreenHeight()) - rec.Y
+			}
+			if rl.IsMouseButtonReleased(rl.MouseLeftButton) {
+				MouseScaleMode = false
+			}
+
+		}
+
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.DrawText("Scale rectangle dragging from bottom-right corner!", 10, 10, 20, rl.Black)
+
+		rl.DrawRectangleRec(rec, rl.Fade(rl.Green, 0.5))
+
+		if mouseScaleReady {
+			rl.DrawRectangleLinesEx(rec, 1, rl.Red)
+			rl.DrawTriangle(rl.NewVector2(rec.X+rec.Width-mouseScaleMarkSize, rec.Y+rec.Height), rl.NewVector2(rec.X+rec.Width, rec.Y+rec.Height), rl.NewVector2(rec.X+rec.Width, rec.Y+rec.Height-mouseScaleMarkSize), rl.Red)
+		}
+
+		rl.EndDrawing()
+
+	}
+
+	rl.CloseWindow()
+}