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| Drawing Question [message #4934] |
Sat, 26 August 2006 19:46  |
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when look into the Paint routine of TreeCtrl and ArrayCtrl,strange to see when drawing a line,DrawRect is used not DrawLine,so why,can someone teach me this?
[Updated on: Sat, 26 August 2006 19:48] by Moderator Report message to a moderator |
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| Re: Drawing Question [message #4935 is a reply to message #4934] |
Sat, 26 August 2006 22:24  |
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| hongdong wrote on Sat, 26 August 2006 13:46 |
when look into the Paint routine of TreeCtrl and ArrayCtrl,strange to see when drawing a line,DrawRect is used not DrawLine,so why,can someone teach me this?
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Because is faster to draw a rectangle than a line on most gpus. If you simulate drawing horizonal and vertical lines using recangles gpu dosn't have to calculate bresenham factors and can optimize memory writes - whatever that could mean  (because it knows that gfx memory will be accessed lineary).
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