Strange NSView redraw problem
Strange NSView redraw problem
- Subject: Strange NSView redraw problem
- From: "John Cassington" <email@hidden>
- Date: Sat, 30 Sep 2006 15:39:52 +1000
Hello,
I have a nsview class which is used more than once at a time. the view
can be 'selected' in that its background color can change based on a
boolean value.
when i change the 'selection' from view to view, the nsbezierpath used
to draw the curved border around the view does not clear properly.
here are two example images:
before: http://img88.imageshack.us/img88/7259/beforemultipleredrawsvc7.png
after: http://img136.imageshack.us/img136/3713/aftermultipleredrawsrz9.png
i think this has something to do with anti-aliasing, but i am not sure.
i am using the following three lines to try and clear the view before a redraw:
NSEraseRect([self frame]);
[[NSColor clearColor] set];
NSRectFill([self frame]);
here is the whole code:
<<START CODE>>
NSEraseRect([self frame]);
[[NSColor clearColor] set];
NSRectFill([self frame]);
NSColor *bgColor = [NSColor colorWithCalibratedWhite:0.25 alpha:0.85];
NSRect bgRect = rect;
int minX = NSMinX(bgRect);
int midX = NSMidX(bgRect);
int maxX = NSMaxX(bgRect);
int minY = NSMinY(bgRect);
int midY = NSMidY(bgRect);
int maxY = NSMaxY(bgRect);
float radius = 10.0; // correct value to duplicate Panther's App Switcher
NSBezierPath *bgPath = [NSBezierPath bezierPath];
// Bottom edge and bottom-right curve
[bgPath moveToPoint:NSMakePoint(midX, minY)];
[bgPath appendBezierPathWithArcFromPoint:NSMakePoint(maxX, minY)
toPoint:NSMakePoint(maxX, midY)
radius:radius];
// Right edge and top-right curve
[bgPath appendBezierPathWithArcFromPoint:NSMakePoint(maxX, maxY)
toPoint:NSMakePoint(midX, maxY)
radius:radius];
// Top edge and top-left curve
[bgPath appendBezierPathWithArcFromPoint:NSMakePoint(minX, maxY)
toPoint:NSMakePoint(minX, midY)
radius:radius];
// Left edge and bottom-left curve
[bgPath appendBezierPathWithArcFromPoint:bgRect.origin
toPoint:NSMakePoint(midX, minY)
radius:radius];
[bgPath closePath];
[bgColor set];
if (isSelected) {
[[NSColor colorWithCalibratedWhite:1.0 alpha:0.3] set];
}
[bgPath fill];
[[NSColor colorWithCalibratedWhite:1.0 alpha:0.2] set];
[bgPath setLineWidth:2.0];
[bgPath setLineJoinStyle:NSRoundLineJoinStyle];
[bgPath stroke];
int i = 0;
for (i=0;i<[imagesArray count];i++) {
NSImage *thisIcon = [imagesArray objectAtIndex:i];
[thisIcon drawAtPoint:NSMakePoint((64*i)+10,3)
fromRect:NSMakeRect(0,0,[thisIcon size].width,[thisIcon size].height)
operation:NSCompositeSourceOver fraction:1.0];
}
<<END CODE>>
If anyone has any idea as to how i can make the corners of my view
draw properly,
it would be much appreciated.
Thanks,
John Cassington
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