dygraphs/src-es5/extras/smooth-plotter.js

dygraphs is a fast, flexible open source JavaScript charting library.

"use strict";

/**
 * @license
 * Part of dygraphs, see top-level LICENSE.txt file
 * MIT-licenced: https://opensource.org/license/MIT
 */

/* loader wrapper to allow browser use and ES6 imports */
(function _extras_smoothPlotter_closure() {
  'use strict';

  var Dygraph;
  if (window.Dygraph) {
    Dygraph = window.Dygraph;
  } else if (typeof module !== 'undefined') {
    Dygraph = require('../dygraph');
    if (typeof Dygraph.NAME === 'undefined' && typeof Dygraph["default"] !== 'undefined') Dygraph = Dygraph["default"];
  }
  /* end of loader wrapper header */

  /**
   * Given three sequential points, p0, p1 and p2, find the left and right
   * control points for p1.
   *
   * The three points are expected to have x and y properties.
   *
   * The alpha parameter controls the amount of smoothing.
   * If α=0, then both control points will be the same as p1 (i.e. no smoothing).
   *
   * Returns [l1x, l1y, r1x, r1y]
   *
   * It's guaranteed that the line from (l1x, l1y)-(r1x, r1y) passes through p1.
   * Unless allowFalseExtrema is set, then it's also guaranteed that:
   *   l1y ∈ [p0.y, p1.y]
   *   r1y ∈ [p1.y, p2.y]
   *
   * The basic algorithm is:
   * 1. Put the control points l1 and r1 α of the way down (p0, p1) and (p1, p2).
   * 2. Shift l1 and r2 so that the line l1–r1 passes through p1
   * 3. Adjust to prevent false extrema while keeping p1 on the l1–r1 line.
   *
   * This is loosely based on the HighCharts algorithm.
   */
  function getControlPoints(p0, p1, p2, opt_alpha, opt_allowFalseExtrema) {
    var alpha = opt_alpha !== undefined ? opt_alpha : 1 / 3; // 0=no smoothing, 1=crazy smoothing
    var allowFalseExtrema = opt_allowFalseExtrema || false;
    if (!p2) {
      return [p1.x, p1.y, null, null];
    }

    // Step 1: Position the control points along each line segment.
    var l1x = (1 - alpha) * p1.x + alpha * p0.x,
      l1y = (1 - alpha) * p1.y + alpha * p0.y,
      r1x = (1 - alpha) * p1.x + alpha * p2.x,
      r1y = (1 - alpha) * p1.y + alpha * p2.y;

    // Step 2: shift the points up so that p1 is on the l1–r1 line.
    if (l1x != r1x) {
      // This can be derived w/ some basic algebra.
      var deltaY = p1.y - r1y - (p1.x - r1x) * (l1y - r1y) / (l1x - r1x);
      l1y += deltaY;
      r1y += deltaY;
    }

    // Step 3: correct to avoid false extrema.
    if (!allowFalseExtrema) {
      if (l1y > p0.y && l1y > p1.y) {
        l1y = Math.max(p0.y, p1.y);
        r1y = 2 * p1.y - l1y;
      } else if (l1y < p0.y && l1y < p1.y) {
        l1y = Math.min(p0.y, p1.y);
        r1y = 2 * p1.y - l1y;
      }
      if (r1y > p1.y && r1y > p2.y) {
        r1y = Math.max(p1.y, p2.y);
        l1y = 2 * p1.y - r1y;
      } else if (r1y < p1.y && r1y < p2.y) {
        r1y = Math.min(p1.y, p2.y);
        l1y = 2 * p1.y - r1y;
      }
    }
    return [l1x, l1y, r1x, r1y];
  }

  // i.e. is none of (null, undefined, NaN)
  function isOK(x) {
    return !!x && !isNaN(x);
  }
  ;

  // A plotter which uses splines to create a smooth curve.
  // See tests/plotters.html for a demo.
  // Can be controlled via smoothPlotter.smoothing
  function smoothPlotter(e) {
    var ctx = e.drawingContext,
      points = e.points;
    ctx.beginPath();
    ctx.moveTo(points[0].canvasx, points[0].canvasy);

    // right control point for previous point
    var lastRightX = points[0].canvasx,
      lastRightY = points[0].canvasy;
    for (var i = 1; i < points.length; i++) {
      var p0 = points[i - 1],
        p1 = points[i],
        p2 = points[i + 1];
      p0 = p0 && isOK(p0.canvasy) ? p0 : null;
      p1 = p1 && isOK(p1.canvasy) ? p1 : null;
      p2 = p2 && isOK(p2.canvasy) ? p2 : null;
      if (p0 && p1) {
        var controls = getControlPoints({
          x: p0.canvasx,
          y: p0.canvasy
        }, {
          x: p1.canvasx,
          y: p1.canvasy
        }, p2 && {
          x: p2.canvasx,
          y: p2.canvasy
        }, smoothPlotter.smoothing);
        // Uncomment to show the control points:
        // ctx.lineTo(lastRightX, lastRightY);
        // ctx.lineTo(controls[0], controls[1]);
        // ctx.lineTo(p1.canvasx, p1.canvasy);
        lastRightX = lastRightX !== null ? lastRightX : p0.canvasx;
        lastRightY = lastRightY !== null ? lastRightY : p0.canvasy;
        ctx.bezierCurveTo(lastRightX, lastRightY, controls[0], controls[1], p1.canvasx, p1.canvasy);
        lastRightX = controls[2];
        lastRightY = controls[3];
      } else if (p1) {
        // We're starting again after a missing point.
        ctx.moveTo(p1.canvasx, p1.canvasy);
        lastRightX = p1.canvasx;
        lastRightY = p1.canvasy;
      } else {
        lastRightX = lastRightY = null;
      }
    }
    ctx.stroke();
  }
  smoothPlotter.smoothing = 1 / 3;
  smoothPlotter._getControlPoints = getControlPoints; // for testing

  // older versions exported a global.
  // This will be removed in the future.
  // The preferred way to access smoothPlotter is via Dygraph.smoothPlotter.
  window.smoothPlotter = smoothPlotter;
  Dygraph.smoothPlotter = smoothPlotter;

  /* closure and loader wrapper */
  Dygraph._require.add('dygraphs/src/extras/smooth-plotter.js', /* exports */{});
})();
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["_extras_smoothPlotter_closure","Dygraph","window","module","require","NAME","getControlPoints","p0","p1","p2","opt_alpha","opt_allowFalseExtrema","alpha","undefined","allowFalseExtrema","x","y","l1x","l1y","r1x","r1y","deltaY","Math","max","min","isOK","isNaN","smoothPlotter","e","ctx","drawingContext","points","beginPath","moveTo","canvasx","canvasy","lastRightX","lastRightY","i","length","controls","smoothing","bezierCurveTo","stroke","_getControlPoints","_require","add"],"sources":["../../src/extras/smooth-plotter.js"],"sourcesContent":["/**\n * @license\n * Part of dygraphs, see top-level LICENSE.txt file\n * MIT-licenced: https://opensource.org/license/MIT\n */\n\n/* loader wrapper to allow browser use and ES6 imports */\n(function _extras_smoothPlotter_closure() {\n'use strict';\nvar Dygraph;\nif (window.Dygraph) {\n  Dygraph = window.Dygraph;\n} else if (typeof(module) !== 'undefined') {\n  Dygraph = require('../dygraph');\n  if (typeof(Dygraph.NAME) === 'undefined' && typeof(Dygraph.default) !== 'undefined')\n    Dygraph = Dygraph.default;\n}\n/* end of loader wrapper header */\n\n/**\n * Given three sequential points, p0, p1 and p2, find the left and right\n * control points for p1.\n *\n * The three points are expected to have x and y properties.\n *\n * The alpha parameter controls the amount of smoothing.\n * If α=0, then both control points will be the same as p1 (i.e. no smoothing).\n *\n * Returns [l1x, l1y, r1x, r1y]\n *\n * It's guaranteed that the line from (l1x, l1y)-(r1x, r1y) passes through p1.\n * Unless allowFalseExtrema is set, then it's also guaranteed that:\n *   l1y ∈ [p0.y, p1.y]\n *   r1y ∈ [p1.y, p2.y]\n *\n * The basic algorithm is:\n * 1. Put the control points l1 and r1 α of the way down (p0, p1) and (p1, p2).\n * 2. Shift l1 and r2 so that the line l1–r1 passes through p1\n * 3. Adjust to prevent false extrema while keeping p1 on the l1–r1 line.\n *\n * This is loosely based on the HighCharts algorithm.\n */\nfunction getControlPoints(p0, p1, p2, opt_alpha, opt_allowFalseExtrema) {\n  var alpha = (opt_alpha !== undefined) ? opt_alpha : 1/3;  // 0=no smoothing, 1=crazy smoothing\n  var allowFalseExtrema = opt_allowFalseExtrema || false;\n\n  if (!p2) {\n    return [p1.x, p1.y, null, null];\n  }\n\n  // Step 1: Position the control points along each line segment.\n  var l1x = (1 - alpha) * p1.x + alpha * p0.x,\n      l1y = (1 - alpha) * p1.y + alpha * p0.y,\n      r1x = (1 - alpha) * p1.x + alpha * p2.x,\n      r1y = (1 - alpha) * p1.y + alpha * p2.y;\n\n  // Step 2: shift the points up so that p1 is on the l1–r1 line.\n  if (l1x != r1x) {\n    // This can be derived w/ some basic algebra.\n    var deltaY = p1.y - r1y - (p1.x - r1x) * (l1y - r1y) / (l1x - r1x);\n    l1y += deltaY;\n    r1y += deltaY;\n  }\n\n  // Step 3: correct to avoid false extrema.\n  if (!allowFalseExtrema) {\n    if (l1y > p0.y && l1y > p1.y) {\n      l1y = Math.max(p0.y, p1.y);\n      r1y = 2 * p1.y - l1y;\n    } else if (l1y < p0.y && l1y < p1.y) {\n      l1y = Math.min(p0.y, p1.y);\n      r1y = 2 * p1.y - l1y;\n    }\n\n    if (r1y > p1.y && r1y > p2.y) {\n      r1y = Math.max(p1.y, p2.y);\n      l1y = 2 * p1.y - r1y;\n    } else if (r1y < p1.y && r1y < p2.y) {\n      r1y = Math.min(p1.y, p2.y);\n      l1y = 2 * p1.y - r1y;\n    }\n  }\n\n  return [l1x, l1y, r1x, r1y];\n}\n\n// i.e. is none of (null, undefined, NaN)\nfunction isOK(x) {\n  return !!x && !isNaN(x);\n};\n\n// A plotter which uses splines to create a smooth curve.\n// See tests/plotters.html for a demo.\n// Can be controlled via smoothPlotter.smoothing\nfunction smoothPlotter(e) {\n  var ctx = e.drawingContext,\n      points = e.points;\n\n  ctx.beginPath();\n  ctx.moveTo(points[0].canvasx, points[0].canvasy);\n\n  // right control point for previous point\n  var lastRightX = points[0].canvasx, lastRightY = points[0].canvasy;\n\n  for (var i = 1; i < points.length; i++) {\n    var p0 = points[i - 1],\n        p1 = points[i],\n        p2 = points[i + 1];\n    p0 = p0 && isOK(p0.canvasy) ? p0 : null;\n    p1 = p1 && isOK(p1.canvasy) ? p1 : null;\n    p2 = p2 && isOK(p2.canvasy) ? p2 : null;\n    if (p0 && p1) {\n      var controls = getControlPoints({x: p0.canvasx, y: p0.canvasy},\n                                      {x: p1.canvasx, y: p1.canvasy},\n                                      p2 && {x: p2.canvasx, y: p2.canvasy},\n                                      smoothPlotter.smoothing);\n      // Uncomment to show the control points:\n      // ctx.lineTo(lastRightX, lastRightY);\n      // ctx.lineTo(controls[0], controls[1]);\n      // ctx.lineTo(p1.canvasx, p1.canvasy);\n      lastRightX = (lastRightX !== null) ? lastRightX : p0.canvasx;\n      lastRightY = (lastRightY !== null) ? lastRightY : p0.canvasy;\n      ctx.bezierCurveTo(lastRightX, lastRightY,\n                    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