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fix(core): Fixed edge-case in utils.pointOnCurve

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If we were trying to find a point that lied on a part of a curve
that was a perfect horizontal line, no intersection would be found.
This fixes that.

 - Fixes https://github.com/freesewing/freesewing.org/issues/898
 - Fixes https://github.com/freesewing/freesewing.org/issues/899
 - Fixes https://github.com/freesewing/freesewing.org/issues/913
This commit is contained in:
Joost De Cock 2020-08-09 09:50:49 +02:00
parent f45b6665b1
commit 75afc2d9c3
2 changed files with 10 additions and 0 deletions
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8
packages/core/src/utils.js
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@ -89,6 +89,14 @@ export function pointOnCurve(start, cp1, cp2, end, check) {
p1: { x: check.x - 1, y: check.y },
p2: { x: check.x + 1, y: check.y }
})
if (intersections.length === 0) {
// Handle edge case of a curve that's a perfect horizontal line
intersections = curve.intersects({
p1: { x: check.x, y: check.y - 1 },
p2: { x: check.x, y: check.y + 1 }
})
}
if (intersections.length > 0) return intersections.shift()
else return false
}