Wednesday, June 5, 2013

UIBezierPath CGPath example in Objective C (iOS).

UIBezierPath CGPath

The Core Graphics representation of the path.

@property(nonatomic) CGPathRef CGPath

Discussion of [UIBezierPath CGPath]
This property contains a snapshot of the path at any given point in time. Getting this property returns an immutable path object that you can pass to Core Graphics functions. The path object itself is owned by the UIBezierPath object and is valid only until you make further modifications to the path.[UIBezierPath CGPath]

You can set the value of this property to a path you built using the functions of the Core Graphics framework. When setting a new path, this method makes a copy of the path you provide.

UIBezierPath CGPath example.
    UIBezierPath* triangle = [UIBezierPath bezierPath];
    [triangle moveToPoint:CGPointZero];
    [triangle addLineToPoint:CGPointMake(self.view.frame.size.width,0)];
    [triangle addLineToPoint:CGPointMake(0, self.view.frame.size.height)];
    [triangle closePath];
    CGPathRef theCGPath = [triangle CGPath];
    return CGPathCreateCopy(theCGPath);

Example of [UIBezierPath CGPath].
UIBezierPath* path = [UIBezierPath bezierPathWithRect:CGRectMake(0.0f, 0.0f,
                                                                 1.0f, 1.0f)];

CGAffineTransform transform = CGAffineTransformMakeScale(2.0f, 2.0f);
CGPathRef intermediatePath = CGPathCreateCopyByTransformingPath(path.CGPath,

path.CGPath = intermediatePath;

UIBezierPath CGPath example.
- (void) testPath
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointZero];
    [path addQuadCurveToPoint:CGPointMake(1, 1) controlPoint:CGPointMake(-2, 2)];

    CGPathRef p = path.CGPath;

    CGPathApply(p, nil, pathFunction);

End of UIBezierPath CGPath example article.