If you're "writing" with the mouse the following might help. It isn't done,
still needs some sort of check in the drawRect method to know when you've drawn
all the segments and you;ll need to adjust x/y values to the view you're
drawing in, but it will get you started.
- (void) mouseDown:(NSEvent *) inEvent
{
// allocate a mutable data to store event points and times
dragPoints = [[NSMutableData alloc] init];
// save fetch time and location of click and store in dragPoints
NSTimeInterval timestamp = [inEvent timestamp];
NSPoint clickPoint = [inEvent locationInWindow];
[dragPoints appendBytes: ×tamp length: sizeof(NSTimeInterval)];
[dragPoints appendBytes: &dragPoint length: sizeof(NSPoint)];
}
- (void) mouseDragged:(NSEvent *) inEvent
{
NSTimeInterval timestamp = [inEvent timestamp];
NSPoint dragPoint = [inEvent locationInWindow];
// write interval and point to dragPoints mutable data object
[dragPoints appendBytes: ×tamp length: sizeof(NSTimeInterval)];
[dragPoints appendBytes: &dragPoint length: sizeof(NSPoint)];
}
- (void) mouseUp:(NSEvent *) inEvent
{
// save the recording, either in memory or to a file
[dragPoints writeToFile: @"/path/to/some/file.bin"];
[dragPoints release];
}
// In your draw method, you could fetch a timestamp/NSPoint pair from the
recording like so
- (void) drawRect:(NSRect) inRect
{
CGContextRef context = [[NSGraphicsContext
currentContext] graphicsPort];
// some instance variable indicating where you are in the recording
int frameOffset =
currentIncrement * (sizeof(NSTimeInterval) + sizeof(NSPoint));
NSTimeInterval time =
*(NSTimeInterval*)[dragPoints bytes] + frameOffset;
NSPoint point =
*(NSPoint*)[dragPoints bytes] + frameOffset + sizeof(NSTimeInterval);
// draw line
CGContextAddLineToPoint(context, point.x, point.y);
// create a new NSTimer with the delay from "time" variable
[NSTimer scheduledTimerWithTimeInterval: time
target: self
selector: @selector(dearRect:)
userInfo: nil
repeats: NO];
// increment placeholder
currentIncrement++;
}
On Jun 23, 2011, at 5:21 AM, Gustavo Adolfo Pizano wrote:
> Hello all.
>
> Im wondering if animating handwriting is somehow possible to do, I
> have been looking but I find only how to do it in flash.
>
> Can somebody give me some headlights in the right direction so I can
> start digging into?
>
> Thanks a lot.
>
> Gustavo
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