fix: svgparser creates polygon with no points #133
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willmurnane
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May 21, 2025
| if(transformString) { | ||
| path.setAttribute('transform', transformString); | ||
| if (isNaN(r) || r === 0) { | ||
| console.warn('Degenerate circle encountered and will be removed or ignored:', element); |
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I think just "ignored" would be clearer
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| var attr = element.attributes[k]; | ||
| if (attr.name !== 'cx' && attr.name !== 'cy' && attr.name !== 'r' && attr.name !== 'transform') { | ||
| path.setAttribute(attr.name, attr.value); | ||
| } |
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This copies all the attributes except the specified ones. What if we did for (const attr of ['style', 'fill', 'stroke', 'strokeWidth']) { instead, so only the attributes that were previously copied are copied by the new code?
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| // Create a path representing the circle | ||
| // M cx-r,cy A r,r 0 1,0 cx+r,cy A r,r 0 1,0 cx-r,cy Z | ||
| var d = `M ${cx - r},${cy} A ${r},${r} 0 1,0 ${cx + r},${cy} A ${r},${r} 0 1,0 ${cx - r},${cy} Z`; | ||
| path.setAttribute('d', d); | ||
| path.setAttribute('transform', transformString); // Apply the original transform to the new path |
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Instead of creating a string, parsing the string into Arcs, and applying a transform to those, could we create the Arcs directly using the constructor and transform them?
| uniquePolyForCheck.pop(); | ||
| } | ||
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| if (uniquePolyForCheck.length >= 3 && this.isPolygonSelfIntersecting(uniquePolyForCheck)) { |
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- I think this is really two error cases: less than 3 points, not a polygon we can nest and self-intersecting polygon, which should generate different error messages.
- I don't think self-intersecting polygons should necessarily be skipped. If I want to cut out a pair of drop shapes 💧 by making a single 8, I think it's reasonable to cut that out.
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its more like make 2 triangles, with 4 lines, once you cross lines, its selfintersecting which is not allowed. Like an X.
| }; | ||
| } | ||
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| SvgParser.prototype.isPolygonSelfIntersecting = function(uniquePolygonPoints) { |
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- Can we make this a member of the Polygon class?
- Can we add a unit test or two that demonstrates the correctness of the implementation? It looks reasonable to me, but there are some optimizations I can envision (I don't think we need to check for crossing of the lines formed from points (i, i+1) and (i+1, i+2) for example) and it'd be nice to have a test that shows whether those optimizations are valid.
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This pull request refactors the
SvgParserclass to improve handling of SVG elements and introduces new functionality for detecting self-intersecting polygons. The key changes include simplifying the replacement logic forcircleandrectelements, adding a self-intersection check for polygons, and handling degenerate shapes more robustly.Refactoring and Simplification:
circleandrectelements by removing redundant transformation code and directly applying transformations to the new elements. Degenerate shapes (e.g., circles with radius 0 or rectangles with width/height 0) are now identified and removed with a warning. (main/svgparser.js, main/svgparser.jsL1099-R1162)New Features:
isPolygonSelfIntersecting) for polygons. This checks if a polygon's edges intersect inappropriately, and skips processing of self-intersecting paths with a warning. (main/svgparser.js, main/svgparser.jsR1510-R1594)Debugging Enhancements:
console.logandconsole.warnstatements to provide insights into the processing of paths, including degenerate shapes and self-intersections. (main/svgparser.js, main/svgparser.jsR1510-R1594)