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idkiller/foo.js

Created April 15, 2019 09:52
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  1. idkiller created this gist Apr 15, 2019.
    35 changes: 35 additions & 0 deletions foo.js
    View file
    Original file line number Diff line number Diff line change
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    const RAD = Math.PI / 180;

    function bound(x: number, y: number, w: number, h: number, deg: number) {
    const rcos = Math.cos(deg * RAD);
    const rsin = Math.sin(deg * RAD);

    let left = 0;
    let top = 0;
    let right = 0;
    let bottom = 0;

    if (rcos >= 0 && rsin >= 0) { // top, right
    left = x - h * rsin;
    top = y;
    right = x + w * rcos;
    bottom = y + w * rsin + h * rcos;
    } else if (rcos < 0 && rsin >= 0) { // bottom, right
    left = x - h * rsin + w * rcos;
    top = y + h * rcos;
    right = x;
    bottom = y + w * rsin;
    } else if (rcos < 0 && rsin < 0) { // bottom, left
    left = x + w * rcos;
    top = y + w * rsin + h * rcos;
    right = x - h * rsin;
    bottom = y;
    } else { // top, left
    left = x;
    top = y + w * rsin;
    right = x + w * rcos - h * rsin;
    bottom = y + h * rcos;
    }

    return { left, top, right, bottom };
    }