CODEWITHSUNDEEP
ioscocoa-touchcore-graphicsuibezierpath
Ranjit
Ranjit

Reputation: 4646

UIBezierPath drawing issues

I created a class called myBezierPaths, with two member variables of type UIBezierPath and UIColor, and then I tried to use object of this class to draw the bezierpath, but I am not getting bezierpath, below is my code

//Bezierpath.h

@interface BezierPath : NSObject
{
UIBezierPath *m_bezierPath;
UIColor *m_pathColor;
}

@property (nonatomic, strong) UIBezierPath *bezierPath;
@property (nonatomic, strong) UIColor *pathColor;
@end


//drawingView.m


- (void)drawRect:(CGRect)rect
{ 
for (BezierPath *pathobj in m_pathArray) 
{ 
[pathobj.pathColor setStroke];
[pathobj.pathColor setFill];
[pathobj.bezierPath strokeWithBlendMode:kCGBlendModeNormal alpha:1.0]; 
} 
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
*self.myPath = [[BezierPath alloc] init];*

myPath.bezierPath.lineWidth = 5; 
myPath.bezierPath.lineCapStyle = kCGLineCapRound;
myPath.bezierPath.flatness = 0.0;
myPath.bezierPath.lineJoinStyle = kCGLineJoinRound;
myPath.bezierPath.miterLimit = 200.0;

self.myPath.pathColor = [UIColor redColor];

UITouch *mytouch=[[touches allObjects] objectAtIndex:0]; 

[myPath.bezierPath moveToPoint:[mytouch locationInView:self]];
[m_pathArray addObject:self.myPath];
}



- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{

    UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
    [self.myPath.bezierpath addLineToPoint:[mytouch locationInView:self]];    

    [self setNeedsDisplay];    
}

hope I am clear with my explanation, waiting for reply

Regards Ranjit

Upvotes: 2

Views: 2438

Answers (3)

umesh
umesh

Reputation: 454

@Ranjit need some help I've same problem ... I want to change the colors of UIbezierpath. but wen i select the color my previous path also automatically gets colored with new color.

In My first Image i draw a line and selected color is red. but when i select yellow color to draw another line the previous line also change to yellow color.(image no 2)

enter image description here

enter image description here

Upvotes: 0

Aaron Hayman
Aaron Hayman

Reputation: 8502

First, in your drawRect you don't actually fill the shape. You do stroke it (basically draw a border) but you need to call [pathObj.bezierPath fill]; to actually fill the shape with a color.

There's a lot of code you're not showing, so it's hard to tell where the problem might be. I would create a breakpoint in the drawRect method to determine if all of the variables are there. For example, you show (what I assume) to be an array: m_pathArray. Are you sure it's initialized? Are you sure the properties of BezierPath are working correctly? I notice that on touchesBegan you set the pathColor but only access/read the bezierPath variable. Has that been initialized? Where do you create the 'm_bezierPath' instance variable? Do you create it in the BezierPath init method or lazily instantiate it on access?

So those are a few things you could check.

Upvotes: 2

Warren Burton
Warren Burton

Reputation: 17378

You don't show your touchesMoved event handler , but i would expect something like this. Otherwise all you are doing is creating a set of paths of length zero.

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{

UITouch *mytouch=[[touches allObjects] objectAtIndex:0]; 

[self.myPath.bezeirPath lineToPoint:[mytouch locationInView:self]];


}

Upvotes: 0

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