Andrew Zambazos
146 lines
4.1 KiB
JavaScript
146 lines
4.1 KiB
JavaScript
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// AreaChart creates a single filled area chart.
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//
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// Initialize the chart with a size. You can then include a new point
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// in the area chart by providing an (x, y) point via `addPoint`. You
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// can add point markers (<circle>) with an (x, y) as well.
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//
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// SVG:
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//
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// - There is a single path for line.
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//
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// <div class="area-chart">
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// <svg viewBox="0 0 800 75">
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// <path d="..."/>
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// </svg>
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// </div>
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WI.AreaChart = class AreaChart extends WI.View
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{
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constructor()
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{
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super();
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this.element.classList.add("area-chart");
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this._chartElement = this.element.appendChild(createSVGElement("svg"));
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this._chartElement.setAttribute("preserveAspectRatio", "none");
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this._pathElement = this._chartElement.appendChild(createSVGElement("path"));
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this._circleElements = [];
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this._points = [];
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this._markers = [];
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this._size = null;
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}
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// Public
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get size()
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{
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return this._size;
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}
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set size(size)
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{
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if (this._size && this._size.equals(size))
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return;
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this._size = size;
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this._chartElement.setAttribute("viewBox", `0 0 ${size.width} ${size.height}`);
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this.needsLayout();
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}
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addPoint(x, y)
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{
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this._points.push({x, y});
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}
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clearPoints()
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{
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this._points = [];
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}
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addPointMarker(x, y)
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{
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this._markers.push({x, y});
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}
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clearPointMarkers()
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{
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this._markers = [];
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}
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clear()
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{
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this.clearPoints();
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this.clearPointMarkers();
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}
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// Protected
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layout()
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{
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super.layout();
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if (this.layoutReason === WI.View.LayoutReason.Resize)
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return;
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if (!this._size)
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return;
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let pathComponents = [];
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pathComponents.push(`M 0 ${this._size.height}`);
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for (let point of this._points)
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pathComponents.push(`L ${point.x} ${point.y}`);
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let lastX = this._points.length ? this._points.lastValue.x : 0;
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pathComponents.push(`L ${lastX} ${this._size.height}`);
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pathComponents.push("Z");
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let pathString = pathComponents.join(" ");
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this._pathElement.setAttribute("d", pathString);
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if (this._circleElements.length) {
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for (let circle of this._circleElements)
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circle.remove();
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this._circleElements = [];
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}
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if (this._markers.length) {
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for (let {x, y} of this._markers) {
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let circle = this._chartElement.appendChild(createSVGElement("circle"));
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this._circleElements.push(circle);
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circle.setAttribute("cx", x);
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circle.setAttribute("cy", y);
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}
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}
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}
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};
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