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Rotate ebiten

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This commit is contained in:
Hajime Hoshi 2013-12-08 21:03:30 +09:00
parent 889e3356a2
commit e10bac5a8a
1 changed files with 29 additions and 8 deletions
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37
example/game.go
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@ -1,11 +1,12 @@
package main
import (
"image/color"
"fmt"
"github.com/hajimehoshi/go-ebiten/graphics"
"github.com/hajimehoshi/go-ebiten/graphics/matrix"
"github.com/hajimehoshi/go-ebiten/ui"
"image/color"
"math"
)
var TexturePaths = map[string]string{
@ -14,9 +15,12 @@ var TexturePaths = map[string]string{
}
type drawInfo struct {
textures map[string]graphics.TextureId
inputStr string
textureGeo matrix.Geometry
textures map[string]graphics.TextureId
inputStr string
textureX int
textureY int
textureAngle float64
textureGeo matrix.Geometry
}
type Game struct {
@ -36,8 +40,11 @@ func NewGame() *Game {
inputPrevY: -1,
counter: 0,
drawInfo: drawInfo{
textures: map[string]graphics.TextureId{},
textureGeo: matrix.IdentityGeometry(),
textures: map[string]graphics.TextureId{},
textureX: 0,
textureY: 0,
textureAngle: 0,
textureGeo: matrix.IdentityGeometry(),
},
}
}
@ -54,6 +61,9 @@ func (game *Game) OnInputStateUpdated(e ui.InputStateUpdatedEvent) {
}
func (game *Game) Update() {
const textureWidth = 57
const textureHeight = 26
game.counter++
game.drawInfo.inputStr = fmt.Sprintf(`Input State:
X: %d
@ -61,9 +71,20 @@ func (game *Game) Update() {
if game.inputPrevX != -1 && game.inputPrevY != -1 &&
game.inputX != -1 && game.inputY != -1 {
dx, dy := game.inputX - game.inputPrevX, game.inputY - game.inputPrevY
game.drawInfo.textureGeo.Translate(float64(dx), float64(dy))
dx, dy := game.inputX-game.inputPrevX, game.inputY-game.inputPrevY
game.textureX += dx
game.textureY += dy
}
game.drawInfo.textureAngle = 2 * math.Pi * float64(game.counter) / 600
game.drawInfo.textureGeo = matrix.IdentityGeometry()
game.drawInfo.textureGeo.Translate(-textureWidth/2, -textureHeight/2)
game.drawInfo.textureGeo.Rotate(game.drawInfo.textureAngle)
game.drawInfo.textureGeo.Translate(textureWidth, textureHeight)
game.drawInfo.textureGeo.Translate(float64(game.textureX), float64(game.textureY))
// Update for the next frame.
game.inputPrevX, game.inputPrevY = game.inputX, game.inputY