DevTools: extract modules (non-extensions)

third_party/WebKit/Source/devtools/front_end/ui/BezierUI.js

-// Copyright (c) 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-/**
- * @unrestricted
- */
-UI.BezierUI = class {
-  /**
-   * @param {number} width
-   * @param {number} height
-   * @param {number} marginTop
-   * @param {number} controlPointRadius
-   * @param {boolean} linearLine
-   */
-  constructor(width, height, marginTop, controlPointRadius, linearLine) {
-    this.width = width;
-    this.height = height;
-    this.marginTop = marginTop;
-    this.radius = controlPointRadius;
-    this.linearLine = linearLine;
-  }
-
-  /**
-   * @param {!Common.Geometry.CubicBezier} bezier
-   * @param {!Element} path
-   * @param {number} width
-   */
-  static drawVelocityChart(bezier, path, width) {
-    var height = UI.BezierUI.Height;
-    var pathBuilder = ['M', 0, height];
-    /** @const */ var sampleSize = 1 / 40;
-
-    var prev = bezier.evaluateAt(0);
-    for (var t = sampleSize; t < 1 + sampleSize; t += sampleSize) {
-      var current = bezier.evaluateAt(t);
-      var slope = (current.y - prev.y) / (current.x - prev.x);
-      var weightedX = prev.x * (1 - t) + current.x * t;
-      slope = Math.tanh(slope / 1.5);  // Normalise slope
-      pathBuilder = pathBuilder.concat(['L', (weightedX * width).toFixed(2), (height - slope * height).toFixed(2)]);
-      prev = current;
-    }
-    pathBuilder = pathBuilder.concat(['L', width.toFixed(2), height, 'Z']);
-    path.setAttribute('d', pathBuilder.join(' '));
-  }
-
-  /**
-   * @return {number}
-   */
-  curveWidth() {
-    return this.width - this.radius * 2;
-  }
-
-  /**
-   * @return {number}
-   */
-  curveHeight() {
-    return this.height - this.radius * 2 - this.marginTop * 2;
-  }
-
-  /**
-   * @param {!Element} parentElement
-   * @param {string} className
-   * @param {number} x1
-   * @param {number} y1
-   * @param {number} x2
-   * @param {number} y2
-   */
-  _drawLine(parentElement, className, x1, y1, x2, y2) {
-    var line = parentElement.createSVGChild('line', className);
-    line.setAttribute('x1', x1 + this.radius);
-    line.setAttribute('y1', y1 + this.radius + this.marginTop);
-    line.setAttribute('x2', x2 + this.radius);
-    line.setAttribute('y2', y2 + this.radius + this.marginTop);
-  }
-
-  /**
-   * @param {!Element} parentElement
-   * @param {number} startX
-   * @param {number} startY
-   * @param {number} controlX
-   * @param {number} controlY
-   */
-  _drawControlPoints(parentElement, startX, startY, controlX, controlY) {
-    this._drawLine(parentElement, 'bezier-control-line', startX, startY, controlX, controlY);
-    var circle = parentElement.createSVGChild('circle', 'bezier-control-circle');
-    circle.setAttribute('cx', controlX + this.radius);
-    circle.setAttribute('cy', controlY + this.radius + this.marginTop);
-    circle.setAttribute('r', this.radius);
-  }
-
-  /**
-   * @param {?Common.Geometry.CubicBezier} bezier
-   * @param {!Element} svg
-   */
-  drawCurve(bezier, svg) {
-    if (!bezier)
-      return;
-    var width = this.curveWidth();
-    var height = this.curveHeight();
-    svg.setAttribute('width', this.width);
-    svg.setAttribute('height', this.height);
-    svg.removeChildren();
-    var group = svg.createSVGChild('g');
-
-    if (this.linearLine)
-      this._drawLine(group, 'linear-line', 0, height, width, 0);
-
-    var curve = group.createSVGChild('path', 'bezier-path');
-    var curvePoints = [
-      new Common.Geometry.Point(
-          bezier.controlPoints[0].x * width + this.radius,
-          (1 - bezier.controlPoints[0].y) * height + this.radius + this.marginTop),
-      new Common.Geometry.Point(
-          bezier.controlPoints[1].x * width + this.radius,
-          (1 - bezier.controlPoints[1].y) * height + this.radius + this.marginTop),
-      new Common.Geometry.Point(width + this.radius, this.marginTop + this.radius)
-    ];
-    curve.setAttribute(
-        'd', 'M' + this.radius + ',' + (height + this.radius + this.marginTop) + ' C' + curvePoints.join(' '));
-
-    this._drawControlPoints(
-        group, 0, height, bezier.controlPoints[0].x * width, (1 - bezier.controlPoints[0].y) * height);
-    this._drawControlPoints(
-        group, width, 0, bezier.controlPoints[1].x * width, (1 - bezier.controlPoints[1].y) * height);
-  }
-};
-
-UI.BezierUI.Height = 26;