mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 03:08:54 +01:00
86 lines
2.0 KiB
Go
86 lines
2.0 KiB
Go
// Copyright 2017 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build example
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package main
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import (
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"image/color"
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"log"
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"math"
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"github.com/hajimehoshi/ebiten"
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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colorImage *ebiten.Image
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colorImageWidth = 64
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colorImageHeight = 64
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angle = 0
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)
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func update(screen *ebiten.Image) error {
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angle++
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angle %= 360
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if err := screen.Fill(color.White); err != nil {
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return err
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}
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(-float64(colorImageWidth)/2, -float64(colorImageHeight)/2)
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op.GeoM.Rotate(float64(angle) * math.Pi / 180)
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op.GeoM.Translate(screenWidth/2, screenHeight/2)
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if err := screen.DrawImage(colorImage, op); err != nil {
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return err
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}
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return nil
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}
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func main() {
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var err error
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colorImage, err = ebiten.NewImage(colorImageWidth, colorImageHeight, ebiten.FilterLinear)
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if err != nil {
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log.Fatal(err)
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}
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pixels := make([]uint8, 4*colorImageWidth*colorImageHeight)
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for j := 0; j < colorImageHeight; j++ {
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for i := 0; i < colorImageWidth; i++ {
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idx := 4 * (i + j*colorImageWidth)
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switch {
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case j < colorImageHeight/2:
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pixels[idx] = 0xff
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pixels[idx+1] = 0
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pixels[idx+2] = 0
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pixels[idx+3] = 0xff
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default:
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pixels[idx] = 0
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pixels[idx+1] = 0xff
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pixels[idx+2] = 0
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pixels[idx+3] = 0xff
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}
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}
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}
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if err := colorImage.ReplacePixels(pixels); err != nil {
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log.Fatal(err)
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}
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Edge (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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