Question

I m definetely new to any kind of graphics (maybe except taking photos :)) so please forgive if my explanation of problem I faced last night is not very precise and understable.

I m trying to generate code in Cocoa which would draw vectors on the base of SVG files. I ve translated SVG commands into calls of NSBezierPath methods but received graphics is not really good... The shape is similar to the basic one but there are some... distortions(?). It s probably neither an issue of antialiasing nor flatness value set on Cocoa side. I was suggested that the problem may result from different interpretation of control points of Bézier curves by Cocoa methods ang SVG - is that possible? Or what else may cause the problem?

Answer 1

SVG curve to command is control point, control point, end point.

Cocoa curveToPoint method takes end point, control point 1, control point 2

Answer 2

@Peter Hosey

Sure. At this moment I supose that there is really difference in Cocoa and SVG interpretations. I tried to use basic SVG examples and result in Cocoa is different.

SVG version:

<path d="M 100 200 C 100,100 400,100 400,200 z"/>

Cocoa version:

path = [[NSBezierPath alloc] init]; 
[path moveToPoint:NSMakePoint(100, 200)]; 
[path curveToPoint:NSMakePoint(100, 100) controlPoint1:NSMakePoint(400, 100) controlPoint2:NSMakePoint(400, 200)]; 
[path sePath];

Or it is my stupid mistake which I can t notice :)

// I m not using "Add comment" because of lack of code formatting.

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