Mattias Gaertner wrote:
On Tue, 17 Apr 2012 12:12:21 +0200
Marc Weustink<[email protected]> wrote:
Mattias Gaertner wrote:
Reimar Grabowski<[email protected]> hat am 16. April 2012 um 16:42
geschrieben:
> Hi,
>
> I load a TLazIntfImage from disk, manipulate it and show it on my
form in a TImage. Center, Proportional and Stretch properties of the
TImage are set to true.
> Now I want to draw some overlays onto it (drawing to the canvas in
the OnPaint event). Therefor I obviously need the origin and dimensions
of the loaded image in 'canvas space', but I did not find a way to
retrieve this information. Do I have to calculate them myself or can the
TImage give me the needed information?
The image is painted to the area defined by the protected method DestRect.
Maybe this can be made public.
At the moment you have to descend your own TImage class to access it or
write a hack class (e.g. via a class helper).
TImage is not meant to draw to. If you want to custom paint your image,
use a TPaintbox
A TImage is for display only.
TImage has a published OnPaint event. Painting some overlays makes
sense. And for this you need to know where the image is on the canvas.
Who has added this ? Delphi has no OnPaint event.
Yes, if we have an event, we should provide a way to paint.
But to me this is a can of worms, since stretching is handled internally
while the user event draws on the canvas, independent of the stretching.
If you ask me, I wouldn't have added it.
Marc
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