A Paint Program in MFC

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How to retain the drawn line while drawing another,while mouse move,as InvalidateRect() is repainting the window every time. ~~PLZ~~ Please Help me as soon as possible.

Posted 29-Nov-10 1:24am

ShivamShukla

Updated 29-Nov-10 1:50am

#realJSOP

v3

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3 solutions

Solution 2

You can store the start and end points of previous lines and re-draw previous and new lines.

Posted 29-Nov-10 2:23am

KingsGambit

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ShivamShukla 30-Nov-10 0:56am

Thanks for the answer,but
How many times do i have to redraw it?
as now it is retaining 2 lines.

Solution 3

Invalidate() should only be called when the particular window needs to be redrawn. Maybe you're calling it when you shouldn't be called. In general, the paint routines will only be called when windows determines there's been a change to your drawing context area, either by a window being placed on top of yours then removed, or resizing, but if you're drawing layers or have controls that affect appearance, then that's when you'd invalidate certain portions.

Posted 13-Jul-11 7:48am

Albert Holguin

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Alain Rist · Accepted Answer · 2010-11-29T01:35:00

Solution 1

See the Scribble MFC sample[^].
cheers,
AR

Posted 29-Nov-10 1:35am

Alain Rist

Comments

ShivamShukla 30-Nov-10 0:59am

Thanks for the answer,but It is a MDI application I am developing a SDI application

Alain Rist 30-Nov-10 2:06am

There is no difference regarding your question, mouse and painting handling.