ebiten/example/game/testpattern/testpattern.go

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package testpattern
import (
"github.com/hajimehoshi/go-ebiten"
"github.com/hajimehoshi/go-ebiten/graphics"
"github.com/hajimehoshi/go-ebiten/graphics/matrix"
"image"
_ "image/png"
"math"
"os"
)
type TestPattern struct {
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textureId graphics.TextureId
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textureWidth int
textureHeight int
geos []matrix.Geometry
}
func New() *TestPattern {
return &TestPattern{}
}
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func (game *TestPattern) InitTextures(tf graphics.TextureFactory) {
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file, err := os.Open("images/test_pattern.png")
if err != nil {
panic(err)
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
panic(err)
}
if game.textureId, err = tf.NewTextureFromImage(img); err != nil {
panic(err)
}
size := img.Bounds().Size()
game.textureWidth = size.X
game.textureHeight = size.Y
}
func (game *TestPattern) Update(context ebiten.GameContext) {
geo := matrix.IdentityGeometry()
geo.Translate(13, 13)
game.geos = append(game.geos, geo)
geo = matrix.IdentityGeometry()
geo.Translate(float64(13+game.textureWidth), 13)
game.geos = append(game.geos, geo)
geo = matrix.IdentityGeometry()
geo.Translate(float64(13+game.textureWidth*2), 13)
game.geos = append(game.geos, geo)
geo = matrix.IdentityGeometry()
geo.Translate(float64(13+game.textureWidth*3), 13)
game.geos = append(game.geos, geo)
geo = matrix.IdentityGeometry()
geo.Scale(2, 2)
geo.Translate(13, float64(13+game.textureHeight))
game.geos = append(game.geos, geo)
geo = matrix.IdentityGeometry()
geo.Rotate(math.Pi)
geo.Scale(2, 2)
geo.Translate(float64(game.textureWidth*2),
float64(game.textureHeight*2))
geo.Translate(float64(13+game.textureWidth*2),
float64(13+game.textureHeight))
game.geos = append(game.geos, geo)
}
func (game *TestPattern) Draw(g graphics.Context) {
for _, geo := range game.geos {
g.DrawTexture(game.textureId, geo, matrix.IdentityColor())
}
}