bezier-intersect

Set of functions to find intersections between lines and rectangles and Bezier curves of order 2 and 3. Based on thelonious/js-intersections, but with the abstractions removed and some performance tweaking.

Install

npm i -S bezier-intersect

1import {
2  quadBezierLine,
3  cubicBezierLine,
4  quadBezierAABB,
5  cubicBezierAABB
6} from 'bezier-intersect';

1<script src="https://unpkg.com/bezier-intersect"></script>
2<script>
3var res = [];
4bezierIntersect.quadBezierLine(..., res);
5console.log(res);
6</script>

API

quadBezierLine(ax, ay, cx, cy, bx, by, l1x, l1y, l2x, l2y, [result:Array<number>]):number

Calculates the intersection points between the quadratic Bezier curve and line segment. If result is passed, returns the exact number of intersections, and stores them in result as [x, y, x, y]. If not - stops at the first intersection and returns 1 or 0 if there are no intersections.

quadBezierAABB(ax, ay, cx, cy, bx, by, minx, miny, maxx, maxy, [result:Array<number>]):number

Calculates the intersection points between the quadratic Bezier curve and axis-aligned box. If result is passed, returns the exact number of intersections, and stores them in result as [x, y, x, y]. If not - stops at the first intersection and returns 1 or 0 if there are no intersections.

cubicBezierLine(ax, ay, c1x, c1y, c2x, c2y, bx, by, l1x, l1y, l2x, l2y, [result:Array<number>]):number

Calculates the intersection points between the cubic Bezier curve and line segment. If result is passed, returns the exact number of intersections, and stores them in result as [x, y, x, y]. If not - stops at the first intersection and returns 1 or 0 if there are no intersections.

cubicBezierAABB(ax, ay, c1x, c1y, c2x, c2y, bx, by, minx, miny, maxx, maxy, [result:Array<number>]):number

Calculates the intersection points between the cubic Bezier curve and axis-aligned box. If result is passed, returns the exact number of intersections, and stores them in result as [x, y, x, y]. If not - stops at the first intersection and returns 1 or 0 if there are no intersections.

TODO

• More tests
• Bezier/Polygon
• Bezier/Ellipse/Circle

License

MIT