Re: scribbling
Re: scribbling
- Subject: Re: scribbling
- From: John Randolph <email@hidden>
- Date: Wed, 13 Aug 2003 16:28:18 -0700
On Wednesday, August 13, 2003, at 3:17 PM, Richard Chamberlain wrote:
The problem with this is that compared to the lockFocus way the
drawing is not smooth with gaps between each NSBezierPath. The slower
you move the cursor the greater the space between each line is.
I don't really understand why this would be the case.
I've listed the code at the end of my mail in case I've missed
something.
Thanks,
Richard
--
- (void)mouseDown:(NSEvent *)event
{
lastPoint = [self convertPoint:[event locationInWindow]
fromView:nil];
NSLog(@"MouseDown x = %.2f, y = %.2f", lastPoint.x, lastPoint.y);
}
- (void)mouseDragged:(NSEvent *)event
{
NSPoint currentPoint = [self convertPoint:[event locationInWindow]
fromView:nil];
NSBezierPath* path;
path = [[NSBezierPath alloc] init];
[path setLineWidth: 2.0];
[path moveToPoint:lastPoint];
[path lineToPoint: currentPoint];
[path closePath];
[lines addObject:path];
lastPoint = currentPoint;
[self setNeedsDisplayInRect: [path bounds]];
[path release];
}
Well, you're creating a new NSBezierPath object every time
-mouseDragged: is called. Is that really what you want, or do you want
to create the path in -mouseDown:, and add a point to it in
-mouseDragged:?
The way I would go about this, is..
In mouseDown:, create an NSBezierPath object, tell it to moveToPoint:
(current location) and add it to the "lines" array.
In mouseDragged:, send the latest path ([lines lastObject]) a
lineToPoint: message.
In -drawRect: iterate over the paths in 'lines', and stroke any of them
that intersect the given rect.
If you want to get fancy, you might also change the cursor in
-mouseDown: and restore it in -mouseUp:.
-jcr
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| | >Re: scribbling (From: Richard Chamberlain <email@hidden>) |