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/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
// StackedLineChart creates a line chart stratified with sections.
//
// Initialize the chart with a size.
// To populate with data, first initialize the sections. The class names you
// provide for the segments will allow you to style them. You can then include
// a new set of (x, [y1, y2, y3]) points in the chart via `addPointSet`. The
// order of `y` values must be in the same order as the sections.
//
// SVG:
//
// - There is a single path for each stratification.
// - Each path extends all the way down to the bottom, they are layered such
// that the paths for lower sections overlap the paths for upper sections.
//
// <div class="stacked-line-chart">
// <svg width="1000" height="100" viewbox="0 0 1000 100">
// <path class="section-class-name-1" d="..."/>
// <path class="section-class-name-2" d="..."/>
// </svg>
// </div>
WI.StackedLineChart = class StackedLineChart
{
constructor(size)
{
this._element = document.createElement("div");
this._element.classList.add("stacked-line-chart");
this._chartElement = this._element.appendChild(createSVGElement("svg"));
this._pathElements = [];
this._points = [];
this.size = size;
}
// Public
get element()
{
return this._element;
}
get points()
{
return this._points;
}
get size()
{
return this._size;
}
set size(size)
{
this._size = size;
this._chartElement.setAttribute("width", size.width);
this._chartElement.setAttribute("height", size.height);
this._chartElement.setAttribute("viewbox", `0 0 ${size.width} ${size.height}`);
}
initializeSections(sectionClassNames)
{
console.assert(!this._pathElements.length, "Should not initialize multiple times");
sectionClassNames.reverse();
for (let i = 0; i < sectionClassNames.length; ++i) {
let pathElement = this._chartElement.appendChild(createSVGElement("path"));
pathElement.classList.add(sectionClassNames[i]);
this._pathElements.push(pathElement);
}
this._pathElements.reverse();
}
addPointSet(x, ys)
{
console.assert(ys.length === this._pathElements.length);
this._points.push({x, ys});
}
clear()
{
this._points = [];
}
needsLayout()
{
if (this._scheduledLayoutUpdateIdentifier)
return;
this._scheduledLayoutUpdateIdentifier = requestAnimationFrame(this.updateLayout.bind(this));
}
updateLayout()
{
if (this._scheduledLayoutUpdateIdentifier) {
cancelAnimationFrame(this._scheduledLayoutUpdateIdentifier);
this._scheduledLayoutUpdateIdentifier = undefined;
}
let pathComponents = [];
let length = this._pathElements.length;
for (let i = 0; i < length; ++i)
pathComponents[i] = [`M 0 ${this._size.height}`];
for (let {x, ys} of this._points) {
for (let i = 0; i < length; ++i)
pathComponents[i].push(`L ${x} ${ys[i]}`);
}
let lastX = this._points.length ? this._points.lastValue.x : 0;
for (let i = 0; i < length; ++i) {
pathComponents[i].push(`L ${lastX} ${this._size.height}`);
pathComponents[i].push("Z");
let pathString = pathComponents[i].join(" ");
this._pathElements[i].setAttribute("d", pathString);
}
}
};
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