func ChildToParent(coord math.Point, from Control, to Parent) math.Point {
c := from
for {
p := c.Parent()
if p == nil {
panic(fmt.Errorf("Control detached: %s", Path(c)))
}
child := p.Children().Find(c)
if child == nil {
Dump(p)
panic(fmt.Errorf("Control's parent (%p %T) did not contain control (%p %T).", &p, p, &c, c))
}
coord = coord.Add(child.Offset)
if p == to {
return coord
}
if control, ok := p.(Control); ok {
c = control
} else {
Dump(p)
panic(fmt.Errorf("ChildToParent (%p %T) -> (%p %T) reached non-control parent (%p %T).",
&from, from, &to, to, &p, p))
}
}
}
func draw(p Pendulum, canvas gxui.Canvas, x, y int) {
attachment := math.Point{X: ANIMATION_WIDTH/2 + x, Y: y}
phi := p.GetPhi()
ball := math.Point{X: x + ANIMATION_WIDTH/2 + math.Round(float32(l*omath.Sin(phi))), Y: y + math.Round(float32(l*omath.Cos(phi)))}
line := gxui.Polygon{gxui.PolygonVertex{attachment, 0}, gxui.PolygonVertex{ball, 0}}
canvas.DrawLines(line, gxui.DefaultPen)
m := math.Point{int(BALL_RADIUS), int(BALL_RADIUS)}
rect := math.Rect{ball.Sub(m), ball.Add(m)}
canvas.DrawRoundedRect(rect, BALL_RADIUS, BALL_RADIUS, BALL_RADIUS, BALL_RADIUS, gxui.TransparentPen, gxui.CreateBrush(gxui.Yellow))
}
func (t *DefaultTextBoxLine) PaintCarets(c gxui.Canvas) {
controller := t.textbox.controller
for i, cnt := 0, controller.SelectionCount(); i < cnt; i++ {
e := controller.Caret(i)
l := controller.LineIndex(e)
if l == t.lineIndex {
s := controller.LineStart(l)
m := t.outer.MeasureRunes(s, e)
top := math.Point{X: t.caretWidth + m.W, Y: 0}
bottom := top.Add(math.Point{X: 0, Y: t.Size().H})
t.outer.PaintCaret(c, top, bottom)
}
}
}
func (t *DefaultTextBoxLine) PaintSelections(c gxui.Canvas) {
controller := t.textbox.controller
ls, le := controller.LineStart(t.lineIndex), controller.LineEnd(t.lineIndex)
selections := controller.Selections()
if t.textbox.selectionDragging {
interval.Replace(&selections, t.textbox.selectionDrag)
}
interval.Visit(&selections, gxui.CreateTextSelection(ls, le, false), func(s, e uint64, _ int) {
if s < e {
x := t.outer.MeasureRunes(ls, int(s)).W
m := t.outer.MeasureRunes(int(s), int(e))
top := math.Point{X: t.caretWidth + x, Y: 0}
bottom := top.Add(m.Point())
t.outer.PaintSelection(c, top, bottom)
}
})
}