On 03.11.2008, at 14:23, DKJ wrote:
I'm still puzzled by frames and bounds. I put this in the drawRect:
of MyView:
[[NSColor redColor] set];
NSRectFill( self.frame );
[[NSColor blueColor] set];
NSFrameRect( self.bounds );
I put this in the awakeFromNib of my controller:
NSRect r = NSMakeRect( 10.0, 10.0, 200.0, 200.0 );
MyView *mv = [[MyView alloc] initWithFrame:r];
[[theWindow contentView] addSubview:mv];
The blue bounds rectangle is drawn just where I would expect: inset
10 pixels from the lower left corner of the window. But the red
frame rectangle is inset another 10 pixels from the lower left
corner of the blue bounds rectangle.
When I set the origin of r to (0.0, 0.0), the red and blue
rectangles coincide.
What's happening here?
You create a view defining its frame. In your example the frame is
(10,10,200,200) and your bounds would be (0,0,200,200), because
you did not change the origin.
Drawing always takes place within the bounds, the frame is irrelevant.
Therefore the red rectangle is drawn with in offset of 10 pixels from
inside the bounds,
meaning (10,10,200,200) in 'bounds', but (20,20,200,200) in 'frame'
coordinates.
This sentence did not make sense ;) Just keep in mind that drawing
always happens in the
'bounds' coordinate system and the 'frame' represent placement (and
scaling of these bounds.
Regards,
Patrick
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