Add examples/set

examples/set/main.go

@@ -0,0 +1,70 @@
+// Copyright 2019 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build example jsgo
+
+package main
+
+import (
+	"fmt"
+	"image/color"
+	"log"
+	"math/rand"
+	"time"
+
+	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/ebitenutil"
+)
+
+const (
+	screenWidth  = 320
+	screenHeight = 240
+)
+
+func init() {
+	rand.Seed(time.Now().UnixNano())
+}
+
+var offscreen *ebiten.Image
+
+func init() {
+	offscreen, _ = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterDefault)
+}
+
+func update(screen *ebiten.Image) error {
+	w, h := offscreen.Size()
+	x := rand.Intn(w)
+	y := rand.Intn(h)
+	c := color.NRGBA{
+		byte(rand.Intn(256)),
+		byte(rand.Intn(256)),
+		byte(rand.Intn(256)),
+		byte(0xff),
+	}
+	offscreen.Set(x, y, c)
+
+	if ebiten.IsDrawingSkipped() {
+		return nil
+	}
+
+	screen.DrawImage(offscreen, nil)
+	ebitenutil.DebugPrint(screen, fmt.Sprintf("TPS: %0.2f", ebiten.CurrentTPS()))
+	return nil
+}
+
+func main() {
+	if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Test"); err != nil {
+		log.Fatal(err)
+	}
+}