Initial commit

examples/textures/srcrec_dstrec/main.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(800)
+	screenHeight := int32(450)
+
+	raylib.InitWindow(screenWidth, screenHeight, "raylib [textures] examples - texture source and destination rectangles")
+
+	// NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
+	guybrush := raylib.LoadTexture("guybrush.png") // Texture loading
+
+	frameWidth := guybrush.Width / 7
+	frameHeight := guybrush.Height
+
+	// NOTE: Source rectangle (part of the texture to use for drawing)
+	sourceRec := raylib.NewRectangle(0, 0, int32(frameWidth), int32(frameHeight))
+
+	// NOTE: Destination rectangle (screen rectangle where drawing part of texture)
+	destRec := raylib.NewRectangle(screenWidth/2, screenHeight/2, frameWidth*2, frameHeight*2)
+
+	// NOTE: Origin of the texture (rotation/scale point), it's relative to destination rectangle size
+	origin := raylib.NewVector2(float32(frameWidth), float32(frameHeight))
+
+	rotation := float32(0)
+
+	raylib.SetTargetFPS(60)
+
+	for !raylib.WindowShouldClose() {
+		// Update
+		rotation++
+
+		// Draw
+		raylib.BeginDrawing()
+
+		raylib.ClearBackground(raylib.RayWhite)
+
+		// NOTE: Using DrawTexturePro() we can easily rotate and scale the part of the texture we draw
+		// sourceRec defines the part of the texture we use for drawing
+		// destRec defines the rectangle where our texture part will fit (scaling it to fit)
+		// origin defines the point of the texture used as reference for rotation and scaling
+		// rotation defines the texture rotation (using origin as rotation point)
+		raylib.DrawTexturePro(guybrush, sourceRec, destRec, origin, rotation, raylib.White)
+
+		raylib.DrawLine(destRec.X, 0, destRec.X, screenHeight, raylib.Gray)
+		raylib.DrawLine(0, destRec.Y, screenWidth, destRec.Y, raylib.Gray)
+
+		raylib.EndDrawing()
+	}
+
+	raylib.UnloadTexture(guybrush)
+
+	raylib.CloseWindow()
+}