Add examples for file loading

core/loadingpictures/explicitimport/main.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"image/jpeg"
+	"image/png"
+
+	"github.com/gopxl/pixel/v2"
+	"github.com/gopxl/pixel/v2/backends/opengl"
+	"golang.org/x/image/colornames"
+)
+
+func main() {
+	opengl.Run(run)
+}
+
+func run() {
+	cfg := opengl.WindowConfig{
+		Title:  "Image Loading",
+		Bounds: pixel.R(0, 0, 1024, 768),
+	}
+
+	win, err := opengl.NewWindow(cfg)
+	if err != nil {
+		panic(err)
+	}
+	defer win.Destroy()
+
+	p1, err := pixel.PictureDataFromFile("../hiking.png", png.Decode)
+	if err != nil {
+		panic(err)
+	}
+
+	p2, err := pixel.PictureDataFromFile("../hiking.jpeg", jpeg.Decode)
+	if err != nil {
+		panic(err)
+	}
+
+	spr1 := pixel.NewSprite(p1, p1.Bounds())
+	spr2 := pixel.NewSprite(p2, p2.Bounds())
+
+	for !win.Closed() {
+		if win.JustReleased(pixel.KeyEscape) {
+			win.SetClosed(true)
+		}
+
+		win.Clear(colornames.Skyblue)
+
+		spr1.Draw(win, pixel.IM.Moved(win.Bounds().Center().Add(pixel.V(0, 100))))
+		spr2.Draw(win, pixel.IM.Moved(win.Bounds().Center().Add(pixel.V(0, -100))))
+
+		win.Update()
+	}
+}

core/loadingpictures/implicitimport/main.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	// Since we're using a nil decoder, we need to import these to register the formats.
+	_ "image/jpeg"
+	_ "image/png"
+
+	"github.com/gopxl/pixel/v2"
+	"github.com/gopxl/pixel/v2/backends/opengl"
+	"golang.org/x/image/colornames"
+)
+
+func main() {
+	opengl.Run(run)
+}
+
+func run() {
+	cfg := opengl.WindowConfig{
+		Title:  "Image Loading",
+		Bounds: pixel.R(0, 0, 1024, 768),
+	}
+
+	win, err := opengl.NewWindow(cfg)
+	if err != nil {
+		panic(err)
+	}
+	defer win.Destroy()
+
+	p1, err := pixel.PictureDataFromFile("../hiking.png", nil)
+	if err != nil {
+		panic(err)
+	}
+
+	p2, err := pixel.PictureDataFromFile("../hiking.jpeg", nil)
+	if err != nil {
+		panic(err)
+	}
+
+	spr1 := pixel.NewSprite(p1, p1.Bounds())
+	spr2 := pixel.NewSprite(p2, p2.Bounds())
+
+	for !win.Closed() {
+		if win.JustReleased(pixel.KeyEscape) {
+			win.SetClosed(true)
+		}
+
+		win.Clear(colornames.Skyblue)
+
+		spr1.Draw(win, pixel.IM.Moved(win.Bounds().Center().Add(pixel.V(0, 100))))
+		spr2.Draw(win, pixel.IM.Moved(win.Bounds().Center().Add(pixel.V(0, -100))))
+
+		win.Update()
+	}
+}