func NewTiledImage(img *image.RGBA, tileSize image.Point) *TiledImage {
b := img.Bounds()
nx := b.Dx() / tileSize.X
ny := b.Dy() / tileSize.Y
tiles := make([]TileInfo, nx*ny)
for j := 0; j < ny; j++ {
y := b.Min.Y + j*tileSize.Y
for i := 0; i < nx; i++ {
x := b.Min.X + i*tileSize.X
rect := image.Rect(x, y, x+tileSize.X, y+tileSize.Y)
k := i + j*nx
tiles[k].subImage = img.SubImage(rect).(*image.RGBA)
tiles[k].dist2 = math.MaxFloat32
}
}
return &TiledImage{
data: tiles,
nx: nx,
ny: ny,
sx: tileSize.X,
sy: tileSize.Y,
}
}
func (wf *WindowFoundation) handleWindowDrawing() {
waitingForRepaint := false
newStuff := false
var scrBuf *image.RGBA
var invalidRects RectSet
for {
select {
case pane := <-wf.paneCh:
wf.setPane(pane)
case inv := <-wf.Invalidations:
invalidRects = append(invalidRects, inv.Bounds...)
if waitingForRepaint {
newStuff = true
} else {
waitingForRepaint = true
newStuff = true
time.AfterFunc(FrameDelay, func() {
wf.doRepaintWindow <- true
})
}
case <-wf.doRepaintWindow:
waitingForRepaint = false
if !newStuff {
break
}
scr := wf.W.Screen()
if scrBuf == nil || scr.Bounds() != scrBuf.Bounds() {
scrBuf = image.NewRGBA(scr.Bounds())
invalidRects = RectSet{wf.Bounds()}
}
// Report("window drawing starting")
wf.Drawer.Draw(scrBuf, invalidRects)
// Report("window drawing done")
var srs []image.Rectangle
for _, ir := range invalidRects {
sr := RectangleForRect(ir)
si := scrBuf.SubImage(sr)
srs = append(srs, sr)
draw.Draw(scr, scr.Bounds(), si, image.Point{}, draw.Src)
}
invalidRects = invalidRects[:0]
wf.W.FlushImage(srs...)
newStuff = false
}
}
}
func MakeTileInfo(img *image.RGBA, tileSize image.Point) [][]TileInfo {
b := img.Bounds()
nx := b.Dx() / tileSize.X
ny := b.Dy() / tileSize.Y
tiles := make([][]TileInfo, nx)
for i, _ := range tiles {
tiles[i] = make([]TileInfo, ny)
}
for j, y := 0, b.Min.Y; j < ny; j, y = j+1, y+tileSize.Y {
for i, x := 0, b.Min.X; i < nx; i, x = i+1, x+tileSize.X {
rect := image.Rect(x, y, x+tileSize.X, y+tileSize.Y)
tiles[i][j].subImage = img.SubImage(rect).(*image.RGBA)
tiles[i][j].dist2 = math.MaxFloat32
}
}
return tiles
}
func window() {
var wg sync.WaitGroup
size := 500
wg.Add(1)
go func() {
dw, err := wde.NewWindow(size, size)
if err != nil {
fmt.Println(err)
return
}
dw.SetTitle("xkcd-zoom")
dw.SetSize(size, size)
dw.Show()
events := dw.EventChan()
const (
Draw = 1
Redraw = 2
ScaleInPlace = 3
)
redraw := make(chan int, 1)
redraw <- Draw
done := make(chan bool)
go func() {
for {
time.Sleep(time.Second)
redraw <- Redraw
}
}()
go func() {
loop:
for ei := range events {
redrawType := 0
runtime.Gosched()
switch e := ei.(type) {
case wde.MouseDownEvent:
case wde.MouseDraggedEvent:
switch e.Which {
case wde.LeftButton:
changedx := e.Where.X - e.From.X
changedy := e.Where.Y - e.From.Y
drawx += float64(changedx) * scale
drawy += float64(-changedy) * scale
redrawType = Draw
case wde.RightButton:
changedy := e.From.Y - e.Where.Y
mouseScale := float64(changedy) / 100
scale *= math.Pow(2, mouseScale)
redrawType = ScaleInPlace
}
case wde.MouseUpEvent:
if e.Which == wde.RightButton {
scaledTiles = map[float64]map[int]map[int]chan image.Image{}
redrawType = Draw
}
case wde.KeyTypedEvent:
if e.Key == wde.KeyEscape {
break loop
}
case wde.CloseEvent:
break loop
case wde.ResizeEvent:
redrawType = Draw
}
if redrawType != 0 {
select {
case redraw <- redrawType:
default:
}
}
}
dw.Close()
done <- true
}()
var greyBack, screenBuffer *image.RGBA
var grey = color.RGBA{155, 155, 155, 255}
var bufferScale = scale
var lastRedraw int
for {
select {
case redrawType := <-redraw:
if lastRedraw == ScaleInPlace && redrawType == Redraw {
continue
}
lastRedraw = redrawType
s := dw.Screen()
if redrawType == Draw || redrawType == Redraw {
width, height := dw.Size()
tilesh := int(float64(width)/(float64(imageWidth)/scale) + 1)
tilesv := int(float64(height)/(float64(imageHeight)/scale) + 1)
tilecx := drawx / imageWidth
tilecy := drawy / imageHeight
tileMinX := int(-tilecx) - tilesh - 1
tileMinY := int(-tilecy) - tilesv - 1
tileMaxX := int(-tilecx) + tilesh + 1
tileMaxY := int(-tilecy) + tilesv + 1
if greyBack == nil || s.Bounds() != greyBack.Bounds() {
bounds := s.Bounds()
greyBack = image.NewRGBA(bounds)
for x := bounds.Min.X; x <= bounds.Max.X; x++ {
for y := bounds.Min.Y; y <= bounds.Max.Y; y++ {
greyBack.SetRGBA(x, y, grey)
}
}
screenBuffer = image.NewRGBA(bounds)
}
draw.Draw(screenBuffer, screenBuffer.Bounds(), greyBack, image.Point{0, 0}, draw.Src)
for tilex := tileMinX; tilex <= tileMaxX; tilex++ {
for tiley := tileMinY; tiley <= tileMaxY; tiley++ {
scaledTile, ok := getScaledTile(tilex, tiley, scale)
if !ok || scaledTile == nil {
continue
}
dx, dy := mapToScreen(width, height, float64(tilex)*imageWidth, float64(tiley)*imageHeight)
drawRect := scaledTile.Bounds()
drawRect.Min.X += dx
drawRect.Min.Y -= dy
drawRect.Max.X += dx
drawRect.Max.Y -= dy
draw.Draw(screenBuffer, drawRect, scaledTile, image.Point{0, 0}, draw.Src)
}
}
bufferScale = scale
if xs, ok := s.(*xgraphics.Image); ok {
copyToXGraphicsImage(xs, screenBuffer)
} else {
draw.Draw(s, s.Bounds(), screenBuffer, image.Point{0, 0}, draw.Src)
}
} else if redrawType == ScaleInPlace {
scaleFactor := scale / bufferScale
bufBounds := screenBuffer.Bounds()
width := bufBounds.Max.X - bufBounds.Min.X
height := bufBounds.Max.Y - bufBounds.Min.Y
if scaleFactor < 1 {
widthDiff := width - int(float64(width)*scaleFactor)
heightDiff := height - int(float64(height)*scaleFactor)
//bufBounds.Min.X += widthDiff / 2
bufBounds.Max.X -= widthDiff
//bufBounds.Min.Y += heightDiff / 2
bufBounds.Max.Y -= heightDiff
subBuffer := screenBuffer.SubImage(bufBounds)
scaledBuffer := resize.Resize(subBuffer, subBuffer.Bounds(), width, height).(*image.RGBA)
if xs, ok := s.(*xgraphics.Image); ok {
copyToXGraphicsImage(xs, scaledBuffer)
} else {
draw.Draw(s, s.Bounds(), scaledBuffer, image.Point{0, 0}, draw.Src)
}
}
if scaleFactor > 1 {
scaleFactor = 1 / scaleFactor
newWidth := int(float64(width) * scaleFactor)
newHeight := int(float64(height) * scaleFactor)
scaledBuffer := resize.Resize(screenBuffer, screenBuffer.Bounds(), newWidth, newHeight).(*image.RGBA)
if xs, ok := s.(*xgraphics.Image); ok {
copyToXGraphicsImage(xs, scaledBuffer)
} else {
draw.Draw(s, s.Bounds(), scaledBuffer, image.Point{0, 0}, draw.Src)
}
}
}
dw.FlushImage()
case <-done:
wg.Done()
return
}
}
}()
wg.Wait()
wde.Stop()
}
func GetImageGray(img *image.RGBA, offset image.Point) *image.Gray {
imgGray := image.NewGray(img.Rect)
draw.Draw(imgGray, imgGray.Rect, img.SubImage(img.Rect), offset, draw.Src)
return imgGray
}