mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
125 lines
3.2 KiB
Go
125 lines
3.2 KiB
Go
// Copyright 2018 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 jsgo
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package main
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import (
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"bytes"
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"image"
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_ "image/png"
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"log"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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"github.com/hajimehoshi/ebiten/examples/resources/images"
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)
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const (
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screenWidth = 640
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screenHeight = 480
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)
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var ebitenImage *ebiten.Image
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func init() {
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// Decode image from a byte slice instead of a file so that
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// this example works in any working directory.
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// If you want to use a file, there are some options:
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// 1) Use os.Open and pass the file to the image decoder.
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// This is a very regular way, but doesn't work on browsers.
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// 2) Use ebitenutil.OpenFile and pass the file to the image decoder.
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// This works even on browsers.
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// 3) Use ebitenutil.NewImageFromFile to create an ebiten.Image directly from a file.
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// This also works on browsers.
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img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png))
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if err != nil {
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log.Fatal(err)
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}
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ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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}
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func drawRect(screen *ebiten.Image, img *ebiten.Image, x, y, width, height float32, address ebiten.Address, msg string) {
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sx, sy := -width/2, -height/2
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vs := []ebiten.Vertex{
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{
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DstX: x,
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DstY: y,
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SrcX: sx,
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SrcY: sy,
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ColorR: 1,
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ColorG: 1,
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ColorB: 1,
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ColorA: 1,
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},
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{
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DstX: x + width,
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DstY: y,
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SrcX: sx + width,
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SrcY: sy,
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ColorR: 1,
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ColorG: 1,
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ColorB: 1,
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ColorA: 1,
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},
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{
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DstX: x,
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DstY: y + height,
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SrcX: sx,
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SrcY: sy + height,
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ColorR: 1,
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ColorG: 1,
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ColorB: 1,
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ColorA: 1,
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},
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{
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DstX: x + width,
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DstY: y + height,
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SrcX: sx + width,
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SrcY: sy + height,
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ColorR: 1,
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ColorG: 1,
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ColorB: 1,
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ColorA: 1,
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},
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}
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op := &ebiten.DrawTrianglesOptions{}
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op.Address = address
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screen.DrawTriangles(vs, []uint16{0, 1, 2, 1, 2, 3}, img, op)
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ebitenutil.DebugPrintAt(screen, msg, int(x), int(y)-16)
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}
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func update(screen *ebiten.Image) error {
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if ebiten.IsDrawingSkipped() {
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return nil
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}
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const ox, oy = 40, 60
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drawRect(screen, ebitenImage, ox, oy, 200, 100, ebiten.AddressClampToZero, "Regular")
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drawRect(screen, ebitenImage, 220+ox, oy, 200, 100, ebiten.AddressRepeat, "Regular, Repeat")
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subImage := ebitenImage.SubImage(image.Rect(10, 5, 20, 30)).(*ebiten.Image)
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drawRect(screen, subImage, ox, 200+oy, 200, 100, ebiten.AddressClampToZero, "Subimage")
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drawRect(screen, subImage, 220+ox, 200+oy, 200, 100, ebiten.AddressRepeat, "Subimage, Repeat")
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return nil
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}
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func main() {
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if err := ebiten.Run(update, screenWidth, screenHeight, 1, "Sampler Address (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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