Example #1
0
//export areaView_drawRect
func areaView_drawRect(self C.id, rect C.struct_xrect) {
	s := getSysData(self)
	// no need to clear the clip rect; the NSScrollView does that for us (see the setDrawsBackground: call in objc_darwin.m)
	// rectangles in Cocoa are origin/size, not point0/point1; if we don't watch for this, weird things will happen when scrolling
	cliprect := image.Rect(int(rect.x), int(rect.y), int(rect.x+rect.width), int(rect.y+rect.height))
	max := C.frame(self)
	cliprect = image.Rect(0, 0, int(max.width), int(max.height)).Intersect(cliprect)
	if cliprect.Empty() { // no intersection; nothing to paint
		return
	}
	i := s.handler.Paint(cliprect)
	C.drawImage(
		unsafe.Pointer(pixelData(i)), C.intptr_t(i.Rect.Dx()), C.intptr_t(i.Rect.Dy()), C.intptr_t(i.Stride),
		C.intptr_t(cliprect.Min.X), C.intptr_t(cliprect.Min.Y))
}
Example #2
0
//export areaView_drawRect
func areaView_drawRect(self C.id, rect C.struct_xrect, data unsafe.Pointer) {
	a := (*area)(data)
	// no need to clear the clip rect; the NSScrollView does that for us (see the setDrawsBackground: call in objc_darwin.m)
	// rectangles in Cocoa are origin/size, not point0/point1; if we don't watch for this, weird things will happen when scrolling
	cliprect := image.Rect(int(rect.x), int(rect.y), int(rect.x+rect.width), int(rect.y+rect.height))
	cliprect = image.Rect(0, 0, int(a.width), int(a.height)).Intersect(cliprect)
	if cliprect.Empty() { // no intersection; nothing to paint
		return
	}
	i := a.handler.Paint(cliprect)
	success := C.drawImage(
		unsafe.Pointer(pixelData(i)), C.intptr_t(i.Rect.Dx()), C.intptr_t(i.Rect.Dy()), C.intptr_t(i.Stride),
		C.intptr_t(cliprect.Min.X), C.intptr_t(cliprect.Min.Y))
	if success == C.NO {
		panic("error drawing into Area (exactly what is unknown)")
	}
}