func (i *Image) PixelAt(p math.Point) (math.Point, bool) {
ir := i.calculateDrawRect()
if tex := i.Texture(); tex != nil {
s := tex.SizePixels()
p = p.Sub(ir.Min).
ScaleX(float32(s.W) / float32(ir.W())).
ScaleY(float32(s.H) / float32(ir.H()))
if s.Rect().Contains(p) {
return p, true
}
}
return math.Point{X: -1, Y: -1}, false
}
func (c *Container) ContainsPoint(p math.Point) bool {
if !c.outer.IsVisible() || !c.outer.Size().Rect().Contains(p) {
return false
}
for _, v := range c.children {
if v.Control.ContainsPoint(p.Sub(v.Offset)) {
return true
}
}
if c.IsMouseEventTarget() {
return true
}
return false
}
func TopControlsUnder(p math.Point, c Parent) ControlPointList {
children := c.Children()
for i := len(children) - 1; i >= 0; i-- {
child := children[i]
cp := p.Sub(child.Offset)
if child.Control.ContainsPoint(cp) {
l := ControlPointList{ControlPoint{child.Control, cp}}
if cc, ok := child.Control.(Parent); ok {
l = append(l, TopControlsUnder(cp, cc)...)
}
return l
}
}
return ControlPointList{}
}
func BreadcrumbsAt(p Container, pnt math.Point) string {
s := reflect.TypeOf(p).String()
for _, c := range p.Children() {
b := c.Control.Size().Rect().Offset(c.Offset)
if b.Contains(pnt) {
switch t := c.Control.(type) {
case Container:
return s + " > " + BreadcrumbsAt(t, pnt.Sub(c.Offset))
default:
return s + " > " + reflect.TypeOf(c.Control).String()
}
}
}
return s
}
func ControlsUnder(p math.Point, c Parent) ControlPointList {
toVisit := []ParentPoint{ParentPoint{c, p}}
l := ControlPointList{}
for len(toVisit) > 0 {
c = toVisit[0].C
p = toVisit[0].P
toVisit = toVisit[1:]
for _, child := range c.Children() {
cp := p.Sub(child.Offset)
if child.Control.ContainsPoint(cp) {
l = append(l, ControlPoint{child.Control, cp})
if cc, ok := child.Control.(Parent); ok {
toVisit = append(toVisit, ParentPoint{cc, cp})
}
}
}
}
return l
}
func WindowToChild(coord math.Point, to Control) math.Point {
c := to
for {
p := c.Parent()
if p == nil {
panic("Control's parent was nil")
}
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.Sub(child.Offset)
if _, ok := p.(Window); ok {
return coord
}
c = p.(Control)
}
}
func ParentToChild(coord math.Point, from Parent, to Control) math.Point {
return coord.Sub(ChildToParent(math.ZeroPoint, to, from))
}