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🚧 Working on rendering

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This commit is contained in:
joostdecock 2018-07-14 16:04:39 +00:00
parent a1115d94c6
commit 4f39f5e357
10 changed files with 347 additions and 8 deletions
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47
lib/utils.ts
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@ -1,3 +1,5 @@
import { Point } from './point'
/** Rounds a value to PRECISION */
export function round(value: number): number {
return Math.round(value * 1e2) / 1e2;
@ -13,3 +15,48 @@ export function deg2rad(degrees: number): number {
return degrees / 57.29577951308232;
}
/** Find intersection of two (endless) lines */
export function beamsCross(a1: Point, a2: Point, b1: Point, b2: Point): Point | false {
let slopeA = a1.slope(a2);
let slopeB = b1.slope(b2);
if(slopeA === slopeB) return false; // Parallel lines
if(a1.x === a2.x) return new Point(a1.x, slopeB * a1.x + (b1.y - (slopeB * b1.x))); // Vertical line A
else if(b1.x === b2.x) return new Point(b1.x, slopeA * b1.x + (a1.y - (slopeA * a1.x))); // Vertical line B
else {
// Swap points if line A or B goes from right to left
if(a1.x > a2.x) {
let tmp = a1.copy();
a1 = a2.copy();
a2 = tmp;
}
if(b1.x > b2.x) {
let tmp = b1.copy();
b1 = b2.copy();
b2 = tmp;
}
// Find y intercept
let iA = a1.y - (slopeA * a1.x);
let iB = b1.y - (slopeB * b1.x);
// Find intersection
let x = (iB - iA) / (slopeA - slopeB);
let y = slopeA * x *iA;
return new Point(x, y);
}
}
/** Find intersection of two line segments */
export function linesCross(a1: Point, a2: Point, b1: Point, b2: Point): Point | false {
let p = beamsCross(a1,a2,b1,b2);
if(p) {
let lenA = a1.dist(a2);
let lenB = b1.dist(b2);
let lenC = a1.dist(p) + p.dist(a2);
let lenD = b1.dist(p) + p.dist(b2);
if (round(lenA) == round(lenC) && round(lenB) == round(lenD)) return p;
}
return false;
}