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Add segment.part method #114

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Add segment.part method #114

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7 changes: 6 additions & 1 deletion src/line.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -209,7 +209,12 @@ export class Segment extends Line {

/** Contracts (or expands) a line by a specific ratio. */
contract(x: number) {
return new Segment(this.at(x), this.at(1 - x));
return this.part(x, 1 - x);
}

/** Get part of a segment from a start to end ratio. */
part(a: number, b: number) {
return new Segment(this.at(a), this.at(b));
}

equals(other: Segment, tolerance?: number, oriented = false) {
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12 changes: 11 additions & 1 deletion test/line-test.ts
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Expand Up @@ -6,7 +6,7 @@

import {nearlyEquals} from '@mathigon/fermat';
import tape from 'tape';
import {Line, Point} from '../src';
import {Line, Point, Segment} from '../src';


tape('offset and projections', (test) => {
Expand Down Expand Up @@ -42,3 +42,13 @@ tape('line intercepts', (test) => {

test.end();
});

tape('segment part', (test) => {
const a = new Segment(new Point(1, 1), new Point(2, 2));
const b = a.part(0.25, 0.75);
test.true(b.p1.equals(new Point(1.25, 1.25)));
test.true(b.p2.equals(new Point(1.75, 1.75)));

test.end();
});