func main() {
win, err := x11.NewWindow()
if win == nil {
log.Fatalf("no window: %v", err)
}
screen := win.Screen()
bg := canvas.NewBackground(screen.(*image.RGBA), image.White, flushFunc(win))
cvs = canvas.NewCanvas(nil, bg.Rect())
bg.SetItem(cvs)
item := canvas.Draggable(canvas.Moveable(
canvas.NewText(
image.ZP,
0,
"Hello, world",
defaultFont(),
30,
nil)))
item.SetCentre(image.Pt(cvs.Rect().Dx()/2, cvs.Rect().Dy()/3))
cvs.AddItem(item)
// txtitem := canvas.NewText(
// image.Pt(100, 100),
// 0,
// "Working?",
// defaultFont(),
// 20,
// nil)
// img := canvas.ImageOf(txtitem)
// cvs.AddItem(canvas.NewImage(img, false, image.Pt(cvs.Width() / 2, cvs.Height()*2/3)))
cvs.Flush()
ec := win.EventChan()
for {
switch e := (<-ec).(type) {
case nil:
log.Fatal("quitting")
return
case draw.MouseEvent:
if e.Buttons == 0 {
break
}
cvs.HandleMouse(cvs, e, ec)
}
}
}
func main() {
ctxt, err := x11.NewWindow()
if ctxt == nil {
log.Fatalf("no window: %v", err)
}
screen := ctxt.Screen()
bg := canvas.NewBackground(screen.(*image.RGBA), image.White, flushFunc(ctxt))
cvs = canvas.NewCanvas(nil, bg.Rect())
bg.SetItem(cvs)
ec := ctxt.EventChan()
cvs.Flush()
for {
select {
case e := <-ec:
switch e := e.(type) {
case nil:
if closed(ec) {
log.Fatal("quitting")
return
}
case draw.MouseEvent:
if e.Buttons == 0 {
break
}
if cvs.HandleMouse(cvs, e, ec) {
fmt.Printf("handled mouse\n")
break
}
fmt.Printf("raster maker\n")
rasterMaker(e, ec)
}
}
}
}
func main() {
flag.Parse()
wctxt, err := x11.NewWindow()
if wctxt == nil {
log.Exitf("no window: %v", err)
}
screen := wctxt.Screen()
ctxt := &context{}
ctxt.iterations = *iterations
bg := canvas.NewBackground(screen.(*image.RGBA), draw.White, flushFunc(wctxt))
ctxt.cvs = canvas.NewCanvas(nil, bg.Rect())
bg.SetItem(ctxt.cvs)
ctxt.cache = NewTileTable()
ctxt.setFractal(NewMandelbrot(topArea, ctxt.cvs.Rect(), false, 0, ctxt.iterations), draw.ZP)
qc := wctxt.QuitChan()
kc := wctxt.KeyboardChan()
mc := wctxt.MouseChan()
ctxt.cvs.Flush()
for {
select {
case <-qc:
log.Exit("quitting")
return
case m0 := <-mc:
// b1 drag - drag mandel around.
// double-b1 drag - zoom in to rectangle
// douible-b1 click - zoom in a little
// b2 click - julia
// b2 drag - interactive julia
// b3 zoom out
if m0.Buttons == 0 {
break
}
nclick := 0
clicks, finalm := clicker(m0, mc)
for _ = range clicks {
nclick++
}
m := <-finalm
dragging := m.Buttons != 0
switch {
case m0.Buttons&1 != 0:
switch nclick {
case 1:
if dragging {
ctxt.cvs.HandleMouse(ctxt.cvs, m, mc)
}
case 2:
if dragging {
ctxt.zoomRect(m, mc)
} else {
ctxt.zoomABit(m, mc)
}
}
case m0.Buttons&2 != 0:
switch nclick {
case 1:
if dragging {
ctxt.interactiveJulia(m, mc)
} else {
ctxt.julia(m.Point)
}
}
case m0.Buttons&4 != 0:
ctxt.pop()
}
case <-kc:
}
}
}
func main() {
rand.Seed(0)
ctxt, err := x11.NewWindow()
if ctxt == nil {
log.Fatalf("no window: %v", err)
}
screen := ctxt.Screen()
bg := canvas.NewBackground(screen.(*image.RGBA), image.White, flushFunc(ctxt))
window = canvas.NewCanvas(nil, bg.Rect())
bg.SetItem(window)
nballs := 0
ctxt.FlushImage()
csz := window.Rect().Max
// add edges of window
addLine(image.Pt(-1, -1), image.Pt(csz.X, -1))
addLine(image.Pt(csz.X, -1), image.Pt(csz.X, csz.Y))
addLine(image.Pt(csz.X, csz.Y), image.Pt(-1, csz.Y))
addLine(image.Pt(-1, csz.Y), image.Pt(-1, -1))
go sliderProc()
makeRect(image.Rect(30, 30, 200, 100), setAlpha(red, 128))
makeRect(image.Rect(150, 90, 230, 230), setAlpha(blue, 128))
window.Flush()
mkball := make(chan ball)
delball := make(chan bool)
pause := make(chan bool)
go monitor(mkball, delball, pause)
for i := 0; i < nballs; i++ {
mkball <- randBall()
}
ecc := make(chan (<-chan interface{}))
ec := ctxt.EventChan()
for {
select {
case e, ok := <-ec:
if !ok {
return
}
switch e := e.(type) {
case ui.MouseEvent:
if e.Buttons == 0 {
break
}
if window.HandleMouse(window, e, ec) {
break
}
switch {
case e.Buttons&1 != 0:
go handleMouse(e, ec, ecc, lineMaker)
ec = nil
case e.Buttons&2 != 0:
go handleMouse(e, ec, ecc, func(m ui.MouseEvent, ec <-chan interface{}) {
ballMaker(e, ec, mkball)
})
ec = nil
case e.Buttons&4 != 0:
delball <- true
}
case ui.KeyEvent:
fmt.Printf("got key %c (%d)\n", e.Key, e.Key)
switch e.Key {
case ' ':
pause <- true
case 'd':
delball <- true
}
default:
fmt.Printf("unknown event %v\n", e)
}
case ec = <-ecc:
break
}
}
}