mirror of
https://github.com/hajimehoshi/ebiten.git
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63 lines
1.4 KiB
Go
63 lines
1.4 KiB
Go
package rotating
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import (
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"github.com/hajimehoshi/go-ebiten"
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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/png"
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"math"
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"os"
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)
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const (
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ebitenTextureWidth = 57
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ebitenTextureHeight = 26
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)
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type Rotating struct {
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ebitenTextureID graphics.TextureID
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x int
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geometryMatrix matrix.Geometry
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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) InitTextures(tf graphics.TextureFactory) {
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file, err := os.Open("images/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.ebitenTextureID, 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(context ebiten.GameContext) {
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game.x++
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game.geometryMatrix = matrix.IdentityGeometry()
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tx, ty := float64(ebitenTextureWidth), float64(ebitenTextureHeight)
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game.geometryMatrix.Translate(-tx/2, -ty/2)
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game.geometryMatrix.Rotate(float64(game.x) * 2 * math.Pi / float64(ebiten.FPS*10))
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game.geometryMatrix.Translate(tx/2, ty/2)
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centerX := float64(context.ScreenWidth()) / 2
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centerY := float64(context.ScreenHeight()) / 2
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game.geometryMatrix.Translate(centerX-tx/2, centerY-ty/2)
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}
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func (game *Rotating) Draw(g graphics.Context) {
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g.Fill(128, 128, 255)
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g.DrawTexture(game.ebitenTextureID,
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game.geometryMatrix,
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matrix.IdentityColor())
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}
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