How can I draw a dot on the screen on touchesEnded using UIBezierpath

Question

Can someone here please show me how to draw a single dot using UIBezierpath? I am able to draw a line using the UIBezierpath but if I remove my finger and put it back and then remove nothing get drawn on the screen.

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint p = [touch locationInView:self];
    [pPath moveToPoint:p];
    [pPath stroke];
    [self setNeedsDisplay];
}

- (void)drawRect:(CGRect)rect
{
     [pPath stroke];
}

score 7 · Accepted Answer · answered Apr 05 '13 at 21:48

7

Your path doesn't include any line or curve segments to be stroked.

Try this instead:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    CGPoint p = [touches.anyObject locationInView:self];
    static CGFloat const kRadius = 3;
    CGRect rect = CGRectMake(p.x - kRadius, p.y - kRadius, 2 * kRadius, 2 * kRadius);
    pPath = [UIBezierPath bezierPathWithOvalInRect:rect];
    [self setNeedsDisplay];
}

- (void)drawRect:(CGRect)rect {
    [[UIColor blackColor] setFill];
    [pPath fill];
}

answered Apr 05 '13 at 21:48

rob mayoff

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Hello @Rob can I start the path with a Oval? – Ranjit Jan 23 '14 at 09:53
1

@Ranjit Sure. Why not? You don't need my permission. – rob mayoff Jan 23 '14 at 16:43
Ok , @robmayoff, can you look at this and suggest me how it can be done better http://stackoverflow.com/questions/21281278/draw-a-path-with-variable-width-in-ios – Ranjit Jan 23 '14 at 16:55

score 5 · Answer 2 · edited Jun 13 '19 at 04:27

5

I used this code:

 -(void)handleTap:(UITapGestureRecognizer*)singleTap { 
     //draw dot on screen

     CGPoint tapPoint = [singleTap locationInView:self];
     [bezierPath_ moveToPoint:tapPoint];
     [bezierPath_ addLineToPoint:tapPoint];

     [self setNeedsDisplay]; 
}

edited Jun 13 '19 at 04:27

Gino Mempin

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answered Sep 04 '13 at 06:05

mirror

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How can I draw a dot on the screen on touchesEnded using UIBezierpath

2 Answers2

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