On Wed, 30 Nov 2011, zeljko wrote:
On Wednesday 30 of November 2011 10:35:59 michael.vancann...@wisa.be wrote:
Create TBaseClipRegion with abstract method PointIsInRegion(P : TPoint)
(and maybe some others, like line intersections or so).
Create a descendent TRectClipRegion with property ClipRect: TRect.
It can implement the abstract method(s).
Then implement the ClipRegion property, as you propose.
Setting the ClipRect property just sets ClipRegion to a TRectClipRegion
instance with the Rect filled in. (TFPCustomCanvas should own this
instance, i.e. destroy when canvas is destroyed)
Property clipping just determines whether the ClipRegion object
is used, yes or no.
Seems pretty straightforward to me, backwards compatible, and only a single
extra property is introduced (ClipRegion).
+1. That's how qt organized it's painting (QPainter)
ClipRect = bounding rect of clip region (region can have more than 1 rect eg.
poly region).
For the record: I am not affiliated with Qt in any way ;-)
Michael.
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