Function align

src/components/drawing/symbol_defs.js:721–813

(angle, standoff, path)

var lastAngle, lastStandoff;

function align(angle, standoff, path) {
    if((!angle || angle % 360 === 0) && !standoff) return path;

    if(
        lastAngle === angle &&
        lastStandoff === standoff &&
        lastPathIn === path
    ) return lastPathOut;

    lastAngle = angle;
    lastStandoff = standoff;
    lastPathIn = path;

    function rotate(t, xy) {
        var cosT = cos(t);
        var sinT = sin(t);

        var x = xy[0];
        var y = xy[1] + (standoff || 0);
        return [
            x * cosT - y * sinT,
            x * sinT + y * cosT
        ];
    }

    var t = angle / 180 * PI;

    var x = 0;
    var y = 0;
    var cmd = parseSvgPath(path);
    var str = '';

    for(var i = 0; i < cmd.length; i++) {
        var cmdI = cmd[i];
        var op = cmdI[0];

        var x0 = x;
        var y0 = y;

        if(op === 'M' || op === 'L') {
            x = +cmdI[1];
            y = +cmdI[2];
        } else if(op === 'm' || op === 'l') {
            x += +cmdI[1];
            y += +cmdI[2];
        } else if(op === 'H') {
            x = +cmdI[1];
        } else if(op === 'h') {
            x += +cmdI[1];
        } else if(op === 'V') {
            y = +cmdI[1];
        } else if(op === 'v') {
            y += +cmdI[1];
        } else if(op === 'A') {
            x = +cmdI[1];
            y = +cmdI[2];

            var E = rotate(t, [+cmdI[6], +cmdI[7]]);