Example #10: PNG images with alpha channel

RedHatOfficial · May 5, 2020 · 996c567 · 996c567
1 parent c634531
commit 996c567
Showing 1 changed file with 54 additions and 0 deletions.
diff --git a/lesson7/sdl/introduction/test10.go b/lesson7/sdl/introduction/test10.go
@@ -0,0 +1,54 @@
+package main
+
+import (
+	"github.com/veandco/go-sdl2/img"
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+const (
+	width  = 640
+	height = 480
+)
+
+func main() {
+	if err := sdl.Init(sdl.INIT_VIDEO); err != nil {
+		panic(err)
+	}
+	defer sdl.Quit()
+
+	window, err := sdl.CreateWindow("SDL2 example #10", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
+		width, height, sdl.WINDOW_SHOWN)
+	if err != nil {
+		panic(err)
+	}
+	defer window.Destroy()
+
+	primarySurface, err := window.GetSurface()
+	if err != nil {
+		panic(err)
+	}
+
+	image, err := img.Load("globe.png")
+	if err != nil {
+		panic(err)
+	}
+	defer image.Free()
+
+	primarySurface.FillRect(nil, sdl.MapRGB(primarySurface.Format, 192, 255, 192))
+
+	dstRect := sdl.Rect{
+		X: width/2 - image.W/2,
+		Y: height/2 - image.H/2,
+		W: 0,
+		H: 0,
+	}
+
+	err = image.Blit(nil, primarySurface, &dstRect)
+	if err != nil {
+		panic(err)
+	}
+
+	window.UpdateSurface()
+
+	sdl.Delay(5000)
+}