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Asked: 2026-05-15T15:14:04+00:00

Is there a way to geometrically compute the intersection points of a line and

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Is there a way to geometrically compute the intersection points of a line and an arbitrary graphics path? I know where all of the lines and curves are in the path, and I am using the HTML5 canvas element if that helps any. Basically, I have access to all of the canvas drawing commands and their arguments. For instance, if the API was called with a lineTo, then a moveTo, then an arc I have all of that information. Each call to the API is stored in an array. I have the path definition, I just want to figure out where the line intersects the path. Below is an image showing an example of the points I would need to find.

alt text

Thanks for any help! Again, I would rather do this geometrically rather than pixel based if possible.

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1 Answer

  1. Editorial Team

    You might want to have a look at Kevin Lindsey’s Javascript geometry library – it contains probably all the interesection algorithms you are looking for: http://www.kevlindev.com/geometry/index.htm

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