UIBezierPath Smooth Curve for finger touch drawing - iphone

Question

i want to smooth curve on finger touch draw line and i want solution in UIBezierPath only my code not smoothing line completely.my code here's
#implementation MyLineDrawingView
#synthesize undoSteps;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
[super setBackgroundColor:[UIColor whiteColor]];
pathArray=[[NSMutableArray alloc]init];
bufferArray=[[NSMutableArray alloc]init];
}
return self;
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
[[UIColor blackColor] setStroke];
for (UIBezierPath *_path in pathArray)
[_path strokeWithBlendMode:kCGBlendModeNormal alpha:1.0];
}
#pragma mark - Touch Methods
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[bufferArray removeAllObjects];
myPath=[[UIBezierPath alloc]init];
myPath.lineWidth=5;
myPath.miterLimit=-10;
myPath.lineCapStyle = kCGLineCapRound;
myPath.flatness = 0.0;
UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
[myPath moveToPoint:[mytouch locationInView:self]];
[pathArray addObject:myPath];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
[myPath addLineToPoint:[mytouch locationInView:self]];
[self setNeedsDisplay];
}
-(void)undoButtonClicked
{
if([pathArray count]>0)
{
UIBezierPath *_path=[pathArray lastObject];
[bufferArray addObject:_path];
[pathArray removeLastObject];
[self setNeedsDisplay];
}
}
-(void)redoButtonClicked
{
if([bufferArray count]>0){
UIBezierPath *_path=[bufferArray lastObject];
[pathArray addObject:_path];
[bufferArray removeLastObject];
[self setNeedsDisplay];
}
}
- (void)dealloc
{
[pathArray release];
[bufferArray release];
[super dealloc];
}
#end
and i am getting output using my code like below screen shot:
i want smooth curve output like below screen shot:
can any one help me greatly appreciated!
Thanks in Advance!

Answer 1

The problem is that you're only adding points to the path using addLineToPoint:. That's the equivalent of creating a series of straight lines. You really need to add control points, like the handles you might drag while drawing curved paths in Illustrator or Sketch.
You can use addCurveToPoint:controlPoint1:controlPoint2: to add those; the trick is working out where to put the control points, relative to the points you actually get back from the touches* events.
For a good discussion of possible techniques, I recommend the following question: Drawing Smooth Curves - Methods Needed.