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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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25
example/game.go
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@ -1,11 +1,12 @@
package main package main
import ( import (
"image/color"
"fmt" "fmt"
"github.com/hajimehoshi/go-ebiten/graphics" "github.com/hajimehoshi/go-ebiten/graphics"
"github.com/hajimehoshi/go-ebiten/graphics/matrix" "github.com/hajimehoshi/go-ebiten/graphics/matrix"
"github.com/hajimehoshi/go-ebiten/ui" "github.com/hajimehoshi/go-ebiten/ui"
"image/color"
"math"
) )
var TexturePaths = map[string]string{ var TexturePaths = map[string]string{
@ -16,6 +17,9 @@ var TexturePaths = map[string]string{
type drawInfo struct { type drawInfo struct {
textures map[string]graphics.TextureId textures map[string]graphics.TextureId
inputStr string inputStr string
textureX int
textureY int
textureAngle float64
textureGeo matrix.Geometry textureGeo matrix.Geometry
} }
@ -37,6 +41,9 @@ func NewGame() *Game {
counter: 0, counter: 0,
drawInfo: drawInfo{ drawInfo: drawInfo{
textures: map[string]graphics.TextureId{}, textures: map[string]graphics.TextureId{},
textureX: 0,
textureY: 0,
textureAngle: 0,
textureGeo: matrix.IdentityGeometry(), textureGeo: matrix.IdentityGeometry(),
}, },
} }
@ -54,6 +61,9 @@ func (game *Game) OnInputStateUpdated(e ui.InputStateUpdatedEvent) {
} }
func (game *Game) Update() { func (game *Game) Update() {
const textureWidth = 57
const textureHeight = 26
game.counter++ game.counter++
game.drawInfo.inputStr = fmt.Sprintf(`Input State: game.drawInfo.inputStr = fmt.Sprintf(`Input State:
X: %d X: %d
@ -62,8 +72,19 @@ func (game *Game) Update() {
if game.inputPrevX != -1 && game.inputPrevY != -1 && if game.inputPrevX != -1 && game.inputPrevY != -1 &&
game.inputX != -1 && game.inputY != -1 { game.inputX != -1 && game.inputY != -1 {
dx, dy := game.inputX-game.inputPrevX, game.inputY-game.inputPrevY dx, dy := game.inputX-game.inputPrevX, game.inputY-game.inputPrevY
game.drawInfo.textureGeo.Translate(float64(dx), float64(dy)) 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. // Update for the next frame.
game.inputPrevX, game.inputPrevY = game.inputX, game.inputY game.inputPrevX, game.inputPrevY = game.inputX, game.inputY