mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
134 lines
3.5 KiB
Go
134 lines
3.5 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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"errors"
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"fmt"
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"image"
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"image/color"
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_ "image/jpeg"
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"log"
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"math"
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"github.com/golang/freetype/truetype"
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"golang.org/x/image/font"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/examples/resources/fonts"
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"github.com/hajimehoshi/ebiten/examples/resources/images"
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"github.com/hajimehoshi/ebiten/text"
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)
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var (
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count = 0
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gophersImage *ebiten.Image
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mplusFont font.Face
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regularTermination = errors.New("regular termination")
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)
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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.Gophers_jpg))
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if err != nil {
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log.Fatal(err)
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}
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gophersImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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}
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func initFont() {
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tt, err := truetype.Parse(fonts.MPlus1pRegular_ttf)
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if err != nil {
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log.Fatal(err)
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}
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const dpi = 72
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mplusFont = truetype.NewFace(tt, &truetype.Options{
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Size: 12 * ebiten.DeviceScaleFactor(),
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DPI: dpi,
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Hinting: font.HintingFull,
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})
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}
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func update(screen *ebiten.Image) error {
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count++
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if ebiten.IsKeyPressed(ebiten.KeyQ) {
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return regularTermination
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}
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if ebiten.IsDrawingSkipped() {
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return nil
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}
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scale := ebiten.DeviceScaleFactor()
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w, h := gophersImage.Size()
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
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op.GeoM.Scale(scale, scale)
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op.GeoM.Rotate(float64(count%360) * 2 * math.Pi / 360)
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sw, sh := screen.Size()
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op.GeoM.Translate(float64(sw)/2, float64(sh)/2)
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op.Filter = ebiten.FilterLinear
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screen.DrawImage(gophersImage, op)
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fw, fh := ebiten.ScreenSizeInFullscreen()
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msgs := []string{
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"This is an example of the finest fullscreen. Press Q to quit.",
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fmt.Sprintf("Screen size in fullscreen: %d, %d", fw, fh),
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fmt.Sprintf("Game's screen size: %d, %d", sw, sh),
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fmt.Sprintf("Device scale factor: %0.2f", scale),
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}
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for i, msg := range msgs {
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text.Draw(screen, msg, mplusFont, 100, 100+int(float64(i)*16*scale), color.White)
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}
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return nil
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}
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func main() {
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// Call initFont here instead of init funcs since ebiten.DeviceScaleFactor is not available in init.
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initFont()
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ebiten.SetFullscreen(true)
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w, h := ebiten.ScreenSizeInFullscreen()
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// On mobiles, ebiten.MonitorSize is not available so far.
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// Use arbitrary values.
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if w == 0 || h == 0 {
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w = 300
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h = 450
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}
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s := ebiten.DeviceScaleFactor()
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if err := ebiten.Run(update, int(float64(w)*s), int(float64(h)*s), 1/s, "Rotate (Ebiten Demo)"); err != nil && err != regularTermination {
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log.Fatal(err)
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}
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}
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