Cocoa Drawing
Cocoa Drawing
- Subject: Cocoa Drawing
- From: DairyKnight <email@hidden>
- Date: Fri, 1 May 2009 18:20:38 +0800
Hi, all
I'm trying to build a simple scribble program with Cocoa, and got some
questions I couldn't solve. Hope someone here could help.
1. How can I perform a proper drawing in somewhere else rather than
drawRect: ? Like the Win32 GetDC(HWND) and ReleaseDC. (Sorry I'd use lots of
Win32 analogy, coz
I've been a Win32 developer for quite a while.)
2. In the program what I did was respond to mouseDrag and call [NSView
display]. In drawRect I draw all the scribble lines using [NSBezierPath
strokeLineFromPoint]
But it seems the Mac Windows Manager would automatically clean out the whole
drawing area. Is there a way to avoid this? Like the InvalidRect(HWND, 0,
FALSE) in Win32.
3. I used NSTrackingArea first, but it seems not able to respond to
mouse move with button pressed. But mouseDrag would only respond to mouse
move with the left button
down. So there is no way to observe a mouse dragging with the right
button/mid button down on Mac??
Regards,
DairyKnight
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