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go-opengl-pixel
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update 05 guide code

This commit is contained in:
faiface 2017-05-26 14:04:44 +02:00
parent 9a401948ae
commit d5f7088b7d
1 changed files with 9 additions and 10 deletions
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19
examples/guide/05_drawing_efficiently_with_batch/main.go
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@ -46,8 +46,8 @@ func run() {
batch := pixel.NewBatch(&pixel.TrianglesData{}, spritesheet) batch := pixel.NewBatch(&pixel.TrianglesData{}, spritesheet)
var treesFrames []pixel.Rect var treesFrames []pixel.Rect
for x := spritesheet.Bounds().Min.X(); x < spritesheet.Bounds().Max.X(); x += 32 { for x := spritesheet.Bounds().Min.X; x < spritesheet.Bounds().Max.X; x += 32 {
for y := spritesheet.Bounds().Min.Y(); y < spritesheet.Bounds().Max.Y(); y += 32 { for y := spritesheet.Bounds().Min.Y; y < spritesheet.Bounds().Max.Y; y += 32 {
treesFrames = append(treesFrames, pixel.R(x, y, x+32, y+32)) treesFrames = append(treesFrames, pixel.R(x, y, x+32, y+32))
} }
} }
@ -69,28 +69,27 @@ func run() {
dt := time.Since(last).Seconds() dt := time.Since(last).Seconds()
last = time.Now() last = time.Now()
cam := pixel.IM.Scaled(camPos, camZoom).Moved(win.Bounds().Center() - camPos) cam := pixel.IM.Scaled(camPos, camZoom).Moved(win.Bounds().Center().Sub(camPos))
win.SetMatrix(cam) win.SetMatrix(cam)
if win.Pressed(pixelgl.MouseButtonLeft) { if win.Pressed(pixelgl.MouseButtonLeft) {
tree := pixel.NewSprite(spritesheet, treesFrames[rand.Intn(len(treesFrames))]) tree := pixel.NewSprite(spritesheet, treesFrames[rand.Intn(len(treesFrames))])
mouse := cam.Unproject(win.MousePosition()) mouse := cam.Unproject(win.MousePosition())
tree.SetMatrix(pixel.IM.Scaled(0, 4).Moved(mouse)) tree.Draw(batch, pixel.IM.Scaled(pixel.ZV, 4).Moved(mouse))
tree.Draw(batch)
} }
if win.Pressed(pixelgl.KeyLeft) { if win.Pressed(pixelgl.KeyLeft) {
camPos -= pixel.X(camSpeed * dt) camPos.X -= camSpeed * dt
} }
if win.Pressed(pixelgl.KeyRight) { if win.Pressed(pixelgl.KeyRight) {
camPos += pixel.X(camSpeed * dt) camPos.X += camSpeed * dt
} }
if win.Pressed(pixelgl.KeyDown) { if win.Pressed(pixelgl.KeyDown) {
camPos -= pixel.Y(camSpeed * dt) camPos.Y -= camSpeed * dt
} }
if win.Pressed(pixelgl.KeyUp) { if win.Pressed(pixelgl.KeyUp) {
camPos += pixel.Y(camSpeed * dt) camPos.Y += camSpeed * dt
} }
camZoom *= math.Pow(camZoomSpeed, win.MouseScroll().Y()) camZoom *= math.Pow(camZoomSpeed, win.MouseScroll().Y)
win.Clear(colornames.Forestgreen) win.Clear(colornames.Forestgreen)
batch.Draw(win) batch.Draw(win)