CODEWITHSUNDEEP
iosios5ios6uibezierpathcgpath
Fernando Santiago
Fernando Santiago

Reputation: 2288

Get area and perimeter of a UIBezierPath IOS

I have a UIBezierPath:

    CGPathRef tapTargetPath = CGPathCreateCopyByStrokingPath(tracePath.CGPath, NULL, marginError, tracePath.lineCapStyle, tracePath.lineJoinStyle, tracePath.miterLimit);
    UIBezierPath *tracePath = [UIBezierPath bezierPathWithCGPath:tapTargetPath];

when it is touched in the method:

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

I get a point. When i retrieve 2 points i want to get the segment(area or perimeter) of the UIBezierPath that i am touching, how can i accomplish this?

Upvotes: 0

Views: 1215

Answers (2)

archipestre
archipestre

Reputation: 182

CGPathGetBoundingBox does not take into account the brush size and will cut the borders. 

-(CGRect) getBiggerFrameFromPath:(CGPathRef) path{
    CGRect tmpFrame = CGPathGetBoundingBox(path);
    CGRect biggerFrame = CGRectMake(tmpFrame.origin.x-self.brushSize/2,
                                    tmpFrame.origin.y-self.brushSize/2,
                                    tmpFrame.size.width+self.brushSize,
                                    tmpFrame.size.height+self.brushSize);
    return biggerFrame;
}

-(void) refreshDisplayWithPath:(CGPathRef) path{
    [self setNeedsDisplayInRect:[self getBiggerFrameFromPath:path]];
}

Upvotes: 1

Guto Araujo
Guto Araujo

Reputation: 3854

Use CGPathGetBoundingBox to get the bounding box of the path, i.e., the smallest rectangle enclosing all points in the path:

CGRect pathBounds = CGPathGetBoundingBox(tracePath.CGPath)

Upvotes: 0

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