plotly.js/src/traces/carpet/calc_clippath.js

The open source javascript graphing library that powers plotly

'use strict';

module.exports = function makeClipPath(xctrl, yctrl, aax, bax) {
    var i, x, y;
    var segments = [];

    var asmoothing = !!aax.smoothing;
    var bsmoothing = !!bax.smoothing;
    var nea1 = xctrl[0].length - 1;
    var neb1 = xctrl.length - 1;

    // Along the lower a axis:
    for(i = 0, x = [], y = []; i <= nea1; i++) {
        x[i] = xctrl[0][i];
        y[i] = yctrl[0][i];
    }
    segments.push({x: x, y: y, bicubic: asmoothing});

    // Along the upper b axis:
    for(i = 0, x = [], y = []; i <= neb1; i++) {
        x[i] = xctrl[i][nea1];
        y[i] = yctrl[i][nea1];
    }
    segments.push({x: x, y: y, bicubic: bsmoothing});

    // Backwards along the upper a axis:
    for(i = nea1, x = [], y = []; i >= 0; i--) {
        x[nea1 - i] = xctrl[neb1][i];
        y[nea1 - i] = yctrl[neb1][i];
    }
    segments.push({x: x, y: y, bicubic: asmoothing});

    // Backwards along the lower b axis:
    for(i = neb1, x = [], y = []; i >= 0; i--) {
        x[neb1 - i] = xctrl[i][0];
        y[neb1 - i] = yctrl[i][0];
    }
    segments.push({x: x, y: y, bicubic: bsmoothing});

    return segments;
};