Hi guys,
I'd just like to give you some final feedback, how I was able to solve my
problem, drawing a view with some thousand paths in a slow-motion. You all have
contributed to this approach, which is a mixture of your suggestions, and works
pretty well so far.
The basic idea:
1. make the drawing object able to draw only a part of all paths. Therefore I
introduced an NSRange property, which reflects by default all paths
2. use a timer to step through the paths in small portions for each animations
step and trigger drawRect: (I skipped the timer and use "performSelector")
3. As the previous drawing is still visible, it's not necessary to draw from
the 1st path with every animation step
4. to avoid a corrupted display, I handle resizing (or changed view options)
with a complete redraw
For those who are interested I attached some code fragments of the related
NSView object.
Thanks again for your support!
Matthias
NSView:
- (void)startAnimation
{
[design setDisplayRange:NSMakeRange(0, 0)];
[self setAnimationStep:15];
[self setAnimationDelay:0.1];
[self nextAnimationStep:nil];
}
- (void)pauseAnimation
{
[NSObject cancelPreviousPerformRequestsWithTarget:self];
}
- (void)resumeAnimation
{
[self nextAnimationStep:nil];
}
- (void)stopAnimation
{
[design setDisplayRange:NSMakeRange(0, [[design stitches] count])];
[NSObject cancelPreviousPerformRequestsWithTarget:self];
[self setNeedsDisplay:YES];
}
- (void)nextAnimationStep:(NSTimer *)sender
{
NSRange displayRange = [design displayRange];
displayRange.location += displayRange.length;
displayRange.length = [self animationStep];
if ((displayRange.location + displayRange.length) >= [design
numberOfStitches])
{
[self stopAnimation];
}
else
{
[design setDisplayRange:displayRange];
[self performSelector:@selector(nextAnimationStep:)
withObject:nil afterDelay:[self animationDelay]];
[self setNeedsDisplay:YES];
}
}
- (void)setFrame:(NSRect)frameRect
{
[super setFrame:frameRect];
BOOL animationActive = ([design displayRange].location != 0);
if (animationActive)
{
NSRange displayRange = [design displayRange];
[design setDisplayRange:NSMakeRange(0, displayRange.location +
displayRange.length)];
}
}
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