Hi Matthias
I got frustrated with my own coding and thought I'd take another crack at your
animation problem as a diversion...
Here's the result, enjoy
-Ken
#define DRAW_LINES_BLOCK_SIZE 100
#define DRAW_LINES_BLOCK_DELAY 1
- (void) setFrame:(NSRect) inRect
{
// I'm assuming you store you lines in an array
int lineCount = [lineArray count],
leftovers = lineCount % DRAW_LINES_BLOCK_SIZE,
blockCount = lineCount / DRAW_LINES_BLOCK_SIZE +
((leftovers == 0) ? 0 : 1);
maxBlockIndex = blockCount - 1,
i;
NSRange subrange = NSMakeRange(0, DRAW_LINES_BLOCK_SIZE);
NSInvocation *invocation;
NSValue *rangeWrapper;
// next variable needs to be defined in the interface
if (invocationStack != nil)
[invocationStack release];
// allocate new invocation stack
invocationStack = [[NSMutableArray alloc] initWithCapacity:
blockCount];
// populate invocation stack
for (i = 0; i < blockCount; i++)
{
rangeWrapper = [NSValue valueWithRange: subrange];
invocation = [NSInvocation invocationWithMethodSignature:
[self methodSignatureForSelector: @selector(drawBlockOfLines:)]];
[invocation setTarget: self];
[invocation setSelector: @selector(drawBlockOfLines:)];
[invocation setArgument: &rangeWrapper atIndex: 3];
[invocationStack addObject: invocation];
subrange.location += DRAW_LINES_BLOCK_SIZE;
if (i == maxBlockIndex)
subrange.length = leftovers;
}
[super setFrame: inRect];
// may need a [self setNeedsDisplay: YES] here, not sure...
}
// in your drawRect method
- (void) drawRect:(NSRect) inRect
{
// pop an invocation off the stack and run it
NSInvocation *invocation = [[invocationStack objectAtIndex: 0]
retain];
[invocationStack removeObjectAtIndex: 0];
[invocation invoke];
[invocation release];
// schedule the next round of drawing
[NSTimer scheduledTimerWithTimeInterval: DRAW_LINES_BLOCK_DELAY target:
self selector: @selector(drawRect:) userInfo: nil repeats: NO];
}
- (void) drawBlockOfLines:(NSValue *) inRange
{
NSRange range = [inRange rangeValue];
// do your drawing here
}
On Jun 20, 2011, at 3:49 AM, Matthias Arndt wrote:
> Hi Graham, hi Uli,
>
> guys, you're gems! Thanks for all the input. Currently it's too early to dive
> into some high sophisticated optimization, and with Graham's info I'm
> confident the view's back buffer will work for me.
>
> Am 20. Jun 2011 um 08:59 schrieb Graham Cox <graham....@bigpond.com>:
>
>> The view is already doing this for you. Everything drawn in a view actually
>> ends up in a bitmap - the window's back buffer. If you draw a subrange of
>> your objects, the ones you've earlier drawn into the back buffer are still
>> there. The only time you have to start over is when the view resizes, which
>> is what the 'needsErase' flag is for in my example - the back buffer gets
>> cleared effectively clearing your "cache". There's no reason to reinvent the
>> drawing mechanism from scratch, it's just a duplication of effort.
>
> Hopefully I find some time these days to implement more details of the
> animation based on NSTimer-triggered redraws: Currently it's only quick &
> dirty, but seems to do the trick. I'll keep you posted.
>
> Thanks again, Mattes
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