ebiten/example/game/input/input.go

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package input
import (
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"fmt"
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"github.com/hajimehoshi/go-ebiten"
"github.com/hajimehoshi/go-ebiten/graphics"
"github.com/hajimehoshi/go-ebiten/graphics/matrix"
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"image"
"os"
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)
type Input struct {
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textTextureId graphics.TextureId
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inputState ebiten.InputState
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}
func New() *Input {
return &Input{}
}
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func (game *Input) InitTextures(tf graphics.TextureFactory) {
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file, err := os.Open("images/text.png")
if err != nil {
panic(err)
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
panic(err)
}
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if game.textTextureId, err = tf.CreateTextureFromImage(img); err != nil {
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panic(err)
}
}
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func (game *Input) Update(context ebiten.GameContext) {
game.inputState = context.InputState()
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}
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func (game *Input) Draw(g graphics.Context) {
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g.Fill(128, 128, 255)
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str := fmt.Sprintf(`Input State:
X: %d
Y: %d`, game.inputState.X, game.inputState.Y)
game.drawText(g, str, 5, 5)
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}
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func (game *Input) drawText(g graphics.Context, text string, x, y int) {
const letterWidth = 6
const letterHeight = 16
parts := []graphics.TexturePart{}
textX := 0
textY := 0
for _, c := range text {
if c == '\n' {
textX = 0
textY += letterHeight
continue
}
code := int(c)
x := (code % 32) * letterWidth
y := (code / 32) * letterHeight
source := graphics.Rect{x, y, letterWidth, letterHeight}
parts = append(parts, graphics.TexturePart{
LocationX: textX,
LocationY: textY,
Source: source,
})
textX += letterWidth
}
geometryMatrix := matrix.IdentityGeometry()
geometryMatrix.Translate(float64(x), float64(y))
colorMatrix := matrix.IdentityColor()
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g.DrawTextureParts(game.textTextureId, parts,
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geometryMatrix, colorMatrix)
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}