mirror of
https://github.com/hajimehoshi/ebiten.git
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70 lines
1.4 KiB
Go
70 lines
1.4 KiB
Go
package rotating
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import (
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"github.com/hajimehoshi/go.ebiten/graphics"
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"github.com/hajimehoshi/go.ebiten/graphics/matrix"
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"image"
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"image/color"
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_ "image/png"
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"math"
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"os"
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)
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type Rotating struct {
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ebitenTexture graphics.Texture
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x int
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}
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func New() *Rotating {
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return &Rotating{}
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}
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func (game *Rotating) ScreenWidth() int {
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return 256
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}
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func (game *Rotating) ScreenHeight() int {
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return 240
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}
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func (game *Rotating) Fps() int {
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return 60
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}
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func (game *Rotating) Init(tf graphics.TextureFactory) {
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file, err := os.Open("ebiten.png")
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if err != nil {
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panic(err)
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}
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defer file.Close()
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img, _, err := image.Decode(file)
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if err != nil {
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panic(err)
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}
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if game.ebitenTexture, err = tf.NewTextureFromImage(img); err != nil {
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panic(err)
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}
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}
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func (game *Rotating) Update() {
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game.x++
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}
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func (game *Rotating) Draw(g graphics.GraphicsContext, offscreen graphics.Texture) {
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g.Fill(&color.RGBA{R: 128, G: 128, B: 255, A: 255})
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geometryMatrix := matrix.IdentityGeometry()
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tx, ty := float64(game.ebitenTexture.Width), float64(game.ebitenTexture.Height)
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geometryMatrix.Translate(-tx/2, -ty/2)
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geometryMatrix.Rotate(float64(game.x) * 2 * math.Pi / float64(game.Fps()*10))
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geometryMatrix.Translate(tx/2, ty/2)
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centerX := float64(game.ScreenWidth()) / 2
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centerY := float64(game.ScreenHeight()) / 2
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geometryMatrix.Translate(centerX-tx/2, centerY-ty/2)
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g.DrawTexture(game.ebitenTexture.ID,
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geometryMatrix,
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matrix.IdentityColor())
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}
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