From 6d2692b0db1b5a06c3ba20034f41ac82ebcdf758 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sun, 5 Feb 2017 05:19:14 +0900
Subject: [PATCH] Add examples/edge to check #315

---
 examples/edge/main.go | 85 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 examples/edge/main.go

diff --git a/examples/edge/main.go b/examples/edge/main.go
new file mode 100644
index 000000000..4fb6937c9
--- /dev/null
+++ b/examples/edge/main.go
@@ -0,0 +1,85 @@
+// Copyright 2017 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
+
+package main
+
+import (
+	"image/color"
+	"log"
+	"math"
+
+	"github.com/hajimehoshi/ebiten"
+)
+
+const (
+	screenWidth  = 320
+	screenHeight = 240
+)
+
+var (
+	colorImage       *ebiten.Image
+	colorImageWidth  = 64
+	colorImageHeight = 64
+	angle            = 0
+)
+
+func update(screen *ebiten.Image) error {
+	angle++
+	angle %= 360
+	if err := screen.Fill(color.White); err != nil {
+		return err
+	}
+	op := &ebiten.DrawImageOptions{}
+	op.GeoM.Translate(-float64(colorImageWidth)/2, -float64(colorImageHeight)/2)
+	op.GeoM.Rotate(float64(angle) * math.Pi / 180)
+	op.GeoM.Translate(screenWidth/2, screenHeight/2)
+	if err := screen.DrawImage(colorImage, op); err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	var err error
+	colorImage, err = ebiten.NewImage(colorImageWidth, colorImageHeight, ebiten.FilterLinear)
+	if err != nil {
+		log.Fatal(err)
+	}
+	pixels := make([]uint8, 4*colorImageWidth*colorImageHeight)
+	for j := 0; j < colorImageHeight; j++ {
+		for i := 0; i < colorImageWidth; i++ {
+			idx := 4 * (i + j*colorImageWidth)
+			switch {
+			case j < colorImageHeight/2:
+				pixels[idx] = 0xff
+				pixels[idx+1] = 0
+				pixels[idx+2] = 0
+				pixels[idx+3] = 0xff
+			default:
+				pixels[idx] = 0
+				pixels[idx+1] = 0xff
+				pixels[idx+2] = 0
+				pixels[idx+3] = 0xff
+			}
+		}
+	}
+	if err := colorImage.ReplacePixels(pixels); err != nil {
+		log.Fatal(err)
+	}
+	if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Edge (Ebiten Demo)"); err != nil {
+		log.Fatal(err)
+	}
+}