func (si *subimage) At(x, y int) color.Color {
p := image.Point{x + si.bounds.Min.X, y + si.bounds.Min.Y}
if !p.In(si.Bounds()) {
return color.Black
}
return si.Image.At(p.X, p.Y)
}
func (si *subimage) Set(x, y int, c color.Color) {
p := image.Point{x, y}
if !p.In(si.Bounds()) {
return
}
si.Image.Set(x, y, c)
}
func parseImgBoundary(img image.Image) {
minX, maxX := img.Bounds().Min.X, img.Bounds().Max.X
minY, maxY := img.Bounds().Min.Y, img.Bounds().Max.Y
for i := minX; i < maxX; i++ {
for j := minY; j < maxY; j++ {
_, _, _, a := img.At(i, j).RGBA()
if a != 0 {
if boundary.Empty() && boundary.Min.X == -1 {
boundary = image.Rect(i, j, i, j)
} else {
_p := image.Point{i, j}
if !_p.In(boundary) {
boundary = boundary.Union(image.Rect(i, j, i, j))
}
}
}
}
}
// Should Make the midline of boundary and the img
l := boundary.Min.X
r := imageW - boundary.Max.X
if l > r {
boundary.Min.X = r
} else if l < r {
boundary.Max.X = imageW - l
}
}
func (i *imageSlice) Set(x, y int, c color.Color) {
p := image.Point{x, y}
if p.In(i.r) {
p = p.Add(i.p)
i.img.Set(p.X, p.Y, c)
}
}
func (si *subimage) At(x, y int) color.Color {
p := image.Point{x, y}
if !p.In(si.Bounds()) {
return color.Black
}
return si.Image.At(x, y)
}
func (d *dimensionChanger) At(x, y int) color.Color {
p := image.Point{x, y}
if !p.In(d.bounds) {
return nil
}
return d.Image.At(x*d.pixel.Dx()+d.Image.Bounds().Canon().Min.X, y*d.pixel.Dy()+d.Image.Bounds().Canon().Min.Y)
}
func (d *dimensionChanger) Set(x, y int, c color.Color) {
p := image.Point{x, y}
if !p.In(d.bounds) {
return
}
draw.Draw(d.Image, d.pixel.Add(image.Point{x * d.pixel.Dx(), y * d.pixel.Dy()}).Add(d.Image.Bounds().Canon().Min), &image.Uniform{c}, image.Point{0, 0}, draw.Over)
}
func main() {
bounds := image.Rect(0, 0, 100, 100)
im := image.NewGray(bounds)
gBlack := color.Gray{0}
gWhite := color.Gray{255}
draw.Draw(im, bounds, image.NewUniform(gWhite), image.ZP, draw.Src)
pos := image.Point{50, 50}
dir := up
for pos.In(bounds) {
switch im.At(pos.X, pos.Y).(color.Gray).Y {
case gBlack.Y:
im.SetGray(pos.X, pos.Y, gWhite)
dir--
case gWhite.Y:
im.SetGray(pos.X, pos.Y, gBlack)
dir++
}
if dir&1 == 1 {
pos.X += 1 - dir&2
} else {
pos.Y -= 1 - dir&2
}
}
f, err := os.Create("ant.png")
if err != nil {
fmt.Println(err)
return
}
if err = png.Encode(f, im); err != nil {
fmt.Println(err)
}
if err = f.Close(); err != nil {
fmt.Println(err)
}
}
func (si *subimage) Set(x, y int, c color.Color) {
p := image.Point{x + si.bounds.Min.X, y + si.bounds.Min.Y}
if !p.In(si.Bounds()) {
return
}
si.Image.Set(p.X, p.Y, c)
}
func addPortal(p image.Point) {
for _, portal := range portals {
if p.In(portal) {
return
}
}
portals = append(portals, image.Rect(p.X-7, p.Y, p.X+9, p.Y+16))
}
func (i *imageSlice) At(x, y int) color.Color {
p := image.Point{x, y}
if p.In(i.r) {
p = p.Add(i.p)
return i.img.At(p.X, p.Y)
}
return color.RGBA{0, 0, 0, 0}
}
func (p *packedImage) At(x, y int) color.Color {
point := image.Point{x, y}
for i := range p.ims {
if point.In(p.ims[i].Bounds().Add(p.off[i])) {
return p.ims[i].At(x-p.off[i].X, y-p.off[i].Y)
}
}
return transparent{}
}
// At returns the value of the indicated point.
func (p *PixList) At(pt image.Point) int {
if !pt.In(p.Rect) {
return 0
}
for _, px := range p.Pixel {
if px.Eq(pt) {
return px.Value
}
}
return 0
}
func (b *Box) hitTest(pt image.Point) *Box {
if pt.In(b.bounds) {
for _, k := range b.kids {
target := k.box().hitTest(pt)
if target != nil {
return target
}
}
return b
}
return nil
}
func main() {
g = image.NewGray(image.Rectangle{image.Point{0, 0}, image.Point{w, h}})
// off center seed position makes pleasingly asymetrical tree
g.SetGray(w/3, h/3, color.Gray{frost})
generate:
for a := 0; a < n; {
// generate random position for new particle
rp := image.Point{rand.Intn(w), rand.Intn(h)}
if g.At(rp.X, rp.Y).(color.Gray).Y == frost {
// position is already set. find a nearby free position.
for {
rp.X += rand.Intn(3) - 1
rp.Y += rand.Intn(3) - 1
// execpt if we run out of bounds, consider the particle lost.
if !rp.In(g.Rect) {
continue generate
}
if g.At(rp.X, rp.Y).(color.Gray).Y != frost {
break
}
}
} else {
// else particle is in free space. let it wander
// until it touches tree
for !hasNeighbor(rp) {
rp.X += rand.Intn(3) - 1
rp.Y += rand.Intn(3) - 1
// but again, if it wanders out of bounds consider it lost.
if !rp.In(g.Rect) {
continue generate
}
}
}
// x, y now specify a free position toucing the tree.
g.SetGray(rp.X, rp.Y, color.Gray{frost})
a++
// progress indicator
if a%100 == 0 {
fmt.Println(a, "of", n)
}
}
f, err := os.Create("tree.png")
if err != nil {
fmt.Println(err)
return
}
err = png.Encode(f, g)
if err != nil {
fmt.Println(err)
}
f.Close()
}
func (root *Widget) GetTop(point image.Point) *Widget {
for _, w := range root.Widgets {
if w.GetTop(point) != nil {
return w
}
}
if point.In(root.Rect) {
return root
}
return nil
}
func propagateWheel(w sparta.Widget, pt image.Point) sparta.Widget {
rect := w.Property(sparta.Geometry).(image.Rectangle)
childs := w.Property(sparta.Childs)
if childs == nil {
return w
}
for _, ch := range childs.([]sparta.Widget) {
rect = ch.Property(sparta.Geometry).(image.Rectangle)
if pt.In(rect) {
return propagateWheel(ch, pt.Add(rect.Min))
}
}
return w
}
// DataPtr returns a slice of bytes corresponding to the value at point (x,y) in image.
func (img *Image) DataPtr(x, y int32) ([]byte, error) {
if img == nil {
return nil, fmt.Errorf("Can't get DataPtr for nil dvid.Image")
}
var bytesPerPixel int
var rect image.Rectangle
var src []uint8
var pixOffset func(x, y int) int
switch img.Which {
case 0:
rect = img.Gray.Rect
bytesPerPixel = 1
src = img.Gray.Pix
pixOffset = img.Gray.PixOffset
case 1:
rect = img.Gray16.Rect
bytesPerPixel = 2
src = img.Gray16.Pix
pixOffset = img.Gray16.PixOffset
case 2:
rect = img.NRGBA.Rect
bytesPerPixel = 4
src = img.NRGBA.Pix
pixOffset = img.NRGBA.PixOffset
case 3:
rect = img.NRGBA64.Rect
bytesPerPixel = 8
src = img.NRGBA64.Pix
pixOffset = img.NRGBA64.PixOffset
}
pt := image.Point{int(x), int(y)}
if !pt.In(rect) {
return nil, fmt.Errorf("Point (%d, %d) not in %d x %d image", x, y, rect.Dx(), rect.Dy())
}
pix := make([]uint8, bytesPerPixel)
i := pixOffset(int(x), int(y))
copy(pix, src[i:i+bytesPerPixel])
return pix, nil
}
func (f *Frame) _tick(pt image.Point, ticked bool) {
if f.ticked == ticked || f.tick == nil || !pt.In(f.Rect) {
return
}
pt.X -= f.tickscale
r := image.Rect(pt.X, pt.Y, pt.X+frtickw*f.tickscale, pt.Y+f.Font.Height)
if r.Max.X > f.Rect.Max.X {
r.Max.X = f.Rect.Max.X
}
if ticked {
f.tickback.Draw(f.tickback.R, f.Background, nil, pt)
f.Background.Draw(r, f.tick, nil, image.ZP)
} else {
f.Background.Draw(r, f.tickback, nil, image.ZP)
}
f.ticked = ticked
}
// return true if the map chunk has a cell with coordinates v.X, v.Y
func (mc *MapChunk) HasCell(pt image.Point) bool {
return pt.In(mc.Rect)
}
// check if world tile pt is inside camera bounds c.Rect
// FIXME
func (c *Camera) ContainsWorldPoint(pt image.Point) bool {
return pt.In(c.Rect)
}
func (rectHitTester) HitTest(ctl *Control, pt image.Point) bool {
return pt.In(ctl.Rect())
}
func Black(im image.Image, p image.Point) color.Color {
if p.In(im.Bounds()) {
return im.At(p.X, p.Y)
}
return color.Black
}
// Set sets the value of the indicated point.
func (p *PixList) Set(pt image.Point, val int) {
if val == 0 {
if len(p.Pixel) == 0 {
return
}
if !pt.In(p.Rect) {
return
}
isIn := false
for i, px := range p.Pixel {
if px.Eq(pt) {
p.Pixel[i] = p.Pixel[len(p.Pixel)-1]
p.Pixel[len(p.Pixel)-1] = Pixel{}
p.Pixel = p.Pixel[:len(p.Pixel)-1]
isIn = true
break
}
}
if !isIn {
return
}
if len(p.Pixel) == 0 {
p.Rect = image.Rectangle{}
return
}
if len(p.Pixel) == 1 {
p.Rect.Min.X, p.Rect.Min.Y = p.Pixel[0].X, p.Pixel[0].Y
p.Rect.Max.X, p.Rect.Max.Y = p.Pixel[0].X, p.Pixel[0].Y
return
}
if (pt.X == p.Rect.Min.X) || (pt.X == p.Rect.Max.X) || (pt.Y == p.Rect.Min.Y) || (pt.Y == p.Rect.Max.Y) {
minX, maxX := p.Rect.Max.X, p.Rect.Min.X
minY, maxY := p.Rect.Max.Y, p.Rect.Min.Y
for _, px := range p.Pixel {
if px.X > maxX {
maxX = px.X + 1
}
if px.X < minX {
minX = px.X
}
if px.Y > maxY {
maxY = px.Y + 1
}
if px.Y < minY {
minY = px.Y
}
}
p.Rect = image.Rect(minX, minY, maxX, maxY)
}
return
}
if !pt.In(p.Rect) {
p.Pixel = append(p.Pixel, Pixel{image.Point{X: pt.X, Y: pt.Y}, val})
if len(p.Pixel) == 1 {
p.Rect.Min.X, p.Rect.Min.Y = p.Pixel[0].X, p.Pixel[0].Y
p.Rect.Max.X, p.Rect.Max.Y = p.Pixel[0].X, p.Pixel[0].Y
return
}
minX, maxX := p.Rect.Max.X, p.Rect.Min.X
minY, maxY := p.Rect.Max.Y, p.Rect.Min.Y
for _, px := range p.Pixel {
if px.X > maxX {
maxX = px.X + 1
}
if px.X < minX {
minX = px.X
}
if px.Y > maxY {
maxY = px.Y + 1
}
if px.Y < minY {
minY = px.Y
}
}
p.Rect = image.Rect(minX, minY, maxX, maxY)
return
}
for _, px := range p.Pixel {
if px.Eq(pt) {
px.Value = val
return
}
}
p.Pixel = append(p.Pixel, Pixel{image.Point{X: pt.X, Y: pt.Y}, val})
}
func White(im image.Image, p image.Point) color.Color {
if p.In(im.Bounds()) {
return im.At(p.X, p.Y)
}
return color.White
}
func (obj *ImageItem) HitTest(p image.Point) bool {
return p.In(obj.R)
}
