Function sum

Sums width/height of b with a (ie: a + b), returning result.

import { Rects } from "https://unpkg.com/ixfx/dist/geometry.js";
const rectA = { width: 100, height: 100 };
const rectB = { width: 200, height: 200 };

// Yields: { width: 300, height: 300 }
Rects.sum(rectA, rectB);
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Sums width/height of b with a, returning result.

Note that width/height of b is also added to a's x & y properties

// Yields: { x:101, y:202, width: 110, height: 220 }
sum({x:1, y:2, width:10, height:20}, {width:100, height: 200});
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x & y values of b are ignored. If you want to sum with those, use sumOffset

Sums width/height of rect with given width and height

import { Rects } from "https://unpkg.com/ixfx/dist/geometry.js";
const rect = { width: 100, height: 100 };

// Yields: { width: 300, height: 300 }
Rects.subtract(rect, 200, 200);
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Sums width/height of rect with width and height

width and height is added to rect's x and y values.

// Yields: { x:101, y:202, width: 110, height: 220 }
sum({x:1, y:2, width:10, height:20}, 100, 200);
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