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<h1 class="title">StockChart.qml Example File</h1>
<span class="subtitle">demos/stocqt/content/StockChart.qml</span>
<!-- $$$demos/stocqt/content/StockChart.qml-description -->
<div class="descr"> <a name="details"></a>
<pre class="qml">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * 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.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
****************************************************************************/</span>
import QtQuick 2.0
import QtQuick.Layouts 1.1
import "."
<span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
<span class="name">id</span>: <span class="name">chart</span>
property <span class="type">var</span> <span class="name">stockModel</span>: <span class="number">null</span>
property <span class="type">var</span> <span class="name">startDate</span>: new <span class="name">Date</span>()
property <span class="type">var</span> <span class="name">endDate</span>: new <span class="name">Date</span>()
property <span class="type">string</span> <span class="name">activeChart</span>: <span class="string">"week"</span>
property <span class="type">var</span> <span class="name">settings</span>
property <span class="type">int</span> <span class="name">gridSize</span>: <span class="number">4</span>
property <span class="type">real</span> <span class="name">gridStep</span>: <span class="name">gridSize</span> ? (<span class="name">canvas</span>.<span class="name">width</span> <span class="operator">-</span> <span class="name">canvas</span>.<span class="name">tickMargin</span>) <span class="operator">/</span> <span class="name">gridSize</span> : <span class="name">canvas</span>.<span class="name">xGridStep</span>
<span class="keyword">function</span> <span class="name">update</span>() {
<span class="name">endDate</span> <span class="operator">=</span> new <span class="name">Date</span>();
<span class="keyword">if</span> (<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"year"</span>) {
<span class="name">chart</span>.<span class="name">startDate</span> <span class="operator">=</span> new <span class="name">Date</span>(<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getFullYear</span>() <span class="operator">-</span> <span class="number">1</span>,
<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getMonth</span>(),
<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getDate</span>());
<span class="name">chart</span>.<span class="name">gridSize</span> <span class="operator">=</span> <span class="number">12</span>;
}
<span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"month"</span>) {
<span class="name">chart</span>.<span class="name">startDate</span> <span class="operator">=</span> new <span class="name">Date</span>(<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getFullYear</span>(),
<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getMonth</span>() <span class="operator">-</span> <span class="number">1</span>,
<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getDate</span>());
<span class="name">gridSize</span> <span class="operator">=</span> <span class="number">4</span>;
}
<span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"week"</span>) {
<span class="name">chart</span>.<span class="name">startDate</span> <span class="operator">=</span> new <span class="name">Date</span>(<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getFullYear</span>(),
<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getMonth</span>(),
<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getDate</span>() <span class="operator">-</span> <span class="number">7</span>);
<span class="name">gridSize</span> <span class="operator">=</span> <span class="number">0</span>;
}
<span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"halfyear"</span>) {
<span class="name">chart</span>.<span class="name">startDate</span> <span class="operator">=</span> new <span class="name">Date</span>(<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getFullYear</span>(),
<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getMonth</span>() <span class="operator">-</span> <span class="number">6</span>,
<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getDate</span>());
<span class="name">gridSize</span> <span class="operator">=</span> <span class="number">6</span>;
}
<span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"quarter"</span>) {
<span class="name">chart</span>.<span class="name">startDate</span> <span class="operator">=</span> new <span class="name">Date</span>(<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getFullYear</span>(),
<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getMonth</span>() <span class="operator">-</span> <span class="number">3</span>,
<span class="name">chart</span>.<span class="name">endDate</span>.<span class="name">getDate</span>());
<span class="name">gridSize</span> <span class="operator">=</span> <span class="number">3</span>;
}
<span class="keyword">else</span> {
<span class="name">chart</span>.<span class="name">startDate</span> <span class="operator">=</span> new <span class="name">Date</span>(<span class="number">2005</span>, <span class="number">3</span>, <span class="number">25</span>);
<span class="name">gridSize</span> <span class="operator">=</span> <span class="number">4</span>;
}
<span class="name">canvas</span>.<span class="name">requestPaint</span>();
}
<span class="type"><a href="qml-qtquick-layouts-gridlayout.html">GridLayout</a></span> {
<span class="name">anchors</span>.fill: <span class="name">parent</span>
<span class="name">columns</span>: <span class="number">6</span>
<span class="name">rows</span>: <span class="number">3</span>
<span class="name">columnSpacing</span>: <span class="number">4</span>
<span class="type">Button</span> {
<span class="name">id</span>: <span class="name">weekButton</span>
<span class="name">text</span>: <span class="string">"Week"</span>
<span class="name">buttonEnabled</span>: <span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"week"</span>
<span class="name">onClicked</span>: {
<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">=</span> <span class="string">"week"</span>;
<span class="name">chart</span>.<span class="name">update</span>();
}
}
<span class="type">Button</span> {
<span class="name">id</span>: <span class="name">monthButton</span>
<span class="name">text</span>: <span class="string">"Month"</span>
<span class="name">buttonEnabled</span>: <span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"month"</span>
<span class="name">onClicked</span>: {
<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">=</span> <span class="string">"month"</span>;
<span class="name">chart</span>.<span class="name">update</span>();
}
}
<span class="type">Button</span> {
<span class="name">id</span>: <span class="name">quarterlyButton</span>
<span class="name">text</span>: <span class="string">"3M"</span>
<span class="name">buttonEnabled</span>: <span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"quarter"</span>
<span class="name">onClicked</span>: {
<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">=</span> <span class="string">"quarter"</span>;
<span class="name">chart</span>.<span class="name">update</span>();
}
}
<span class="type">Button</span> {
<span class="name">id</span>: <span class="name">halfYearlyButton</span>
<span class="name">text</span>: <span class="string">"6M"</span>
<span class="name">buttonEnabled</span>: <span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"halfyear"</span>
<span class="name">onClicked</span>: {
<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">=</span> <span class="string">"halfyear"</span>;
<span class="name">chart</span>.<span class="name">update</span>();
}
}
<span class="type">Button</span> {
<span class="name">id</span>: <span class="name">yearButton</span>
<span class="name">text</span>: <span class="string">"Year"</span>
<span class="name">buttonEnabled</span>: <span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"year"</span>
<span class="name">onClicked</span>: {
<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">=</span> <span class="string">"year"</span>;
<span class="name">chart</span>.<span class="name">update</span>();
}
}
<span class="type">Button</span> {
<span class="name">id</span>: <span class="name">maxButton</span>
<span class="name">text</span>: <span class="string">"Max"</span>
<span class="name">buttonEnabled</span>: <span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"max"</span>
<span class="name">onClicked</span>: {
<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">=</span> <span class="string">"max"</span>;
<span class="name">chart</span>.<span class="name">update</span>();
}
}
<span class="type"><a href="qml-qtquick-canvas.html">Canvas</a></span> {
<span class="name">id</span>: <span class="name">canvas</span>
<span class="name">Layout</span>.fillWidth: <span class="number">true</span>
<span class="name">Layout</span>.fillHeight: <span class="number">true</span>
<span class="name">Layout</span>.columnSpan: <span class="number">6</span>
<span class="comment">// Uncomment below lines to use OpenGL hardware accelerated rendering.</span>
<span class="comment">// See Canvas documentation for available options.</span>
<span class="comment">// renderTarget: Canvas.FramebufferObject</span>
<span class="comment">// renderStrategy: Canvas.Threaded</span>
property <span class="type">int</span> <span class="name">pixelSkip</span>: <span class="number">1</span>
property <span class="type">int</span> <span class="name">numPoints</span>: <span class="number">1</span>
property <span class="type">int</span> <span class="name">tickMargin</span>: <span class="number">34</span>
property <span class="type">real</span> <span class="name">xGridStep</span>: (<span class="name">canvas</span>.<span class="name">width</span> <span class="operator">-</span> <span class="name">tickMargin</span>) <span class="operator">/</span> <span class="name">numPoints</span>
property <span class="type">real</span> <span class="name">yGridOffset</span>: <span class="name">canvas</span>.<span class="name">height</span> <span class="operator">/</span> <span class="number">26</span>
property <span class="type">real</span> <span class="name">yGridStep</span>: <span class="name">canvas</span>.<span class="name">height</span> <span class="operator">/</span> <span class="number">12</span>
<span class="keyword">function</span> <span class="name">drawBackground</span>(<span class="name">ctx</span>) {
<span class="name">ctx</span>.<span class="name">save</span>();
<span class="name">ctx</span>.<span class="name">fillStyle</span> <span class="operator">=</span> <span class="string">"#ffffff"</span>;
<span class="name">ctx</span>.<span class="name">fillRect</span>(<span class="number">0</span>, <span class="number">0</span>, <span class="name">canvas</span>.<span class="name">width</span>, <span class="name">canvas</span>.<span class="name">height</span>);
<span class="name">ctx</span>.<span class="name">strokeStyle</span> <span class="operator">=</span> <span class="string">"#d7d7d7"</span>;
<span class="name">ctx</span>.<span class="name">beginPath</span>();
<span class="comment">// Horizontal grid lines</span>
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">i</span> = <span class="number">0</span>; <span class="name">i</span> <span class="operator"><</span> <span class="number">12</span>; i++) {
<span class="name">ctx</span>.<span class="name">moveTo</span>(<span class="number">0</span>, <span class="name">canvas</span>.<span class="name">yGridOffset</span> <span class="operator">+</span> <span class="name">i</span> <span class="operator">*</span> <span class="name">canvas</span>.<span class="name">yGridStep</span>);
<span class="name">ctx</span>.<span class="name">lineTo</span>(<span class="name">canvas</span>.<span class="name">width</span>, <span class="name">canvas</span>.<span class="name">yGridOffset</span> <span class="operator">+</span> <span class="name">i</span> <span class="operator">*</span> <span class="name">canvas</span>.<span class="name">yGridStep</span>);
}
<span class="comment">// Vertical grid lines</span>
var <span class="name">height</span> = <span class="number">35</span> <span class="operator">*</span> <span class="name">canvas</span>.<span class="name">height</span> <span class="operator">/</span> <span class="number">36</span>;
var <span class="name">yOffset</span> = <span class="name">canvas</span>.<span class="name">height</span> <span class="operator">-</span> <span class="name">height</span>;
var <span class="name">xOffset</span> = <span class="number">0</span>;
<span class="keyword">for</span> (<span class="name">i</span> <span class="operator">=</span> <span class="number">0</span>; <span class="name">i</span> <span class="operator"><</span> <span class="name">chart</span>.<span class="name">gridSize</span>; i++) {
<span class="name">ctx</span>.<span class="name">moveTo</span>(<span class="name">xOffset</span> <span class="operator">+</span> <span class="name">i</span> <span class="operator">*</span> <span class="name">chart</span>.<span class="name">gridStep</span>, <span class="name">yOffset</span>);
<span class="name">ctx</span>.<span class="name">lineTo</span>(<span class="name">xOffset</span> <span class="operator">+</span> <span class="name">i</span> <span class="operator">*</span> <span class="name">chart</span>.<span class="name">gridStep</span>, <span class="name">height</span>);
}
<span class="name">ctx</span>.<span class="name">stroke</span>();
<span class="comment">// Right ticks</span>
<span class="name">ctx</span>.<span class="name">strokeStyle</span> <span class="operator">=</span> <span class="string">"#666666"</span>;
<span class="name">ctx</span>.<span class="name">beginPath</span>();
var <span class="name">xStart</span> = <span class="name">canvas</span>.<span class="name">width</span> <span class="operator">-</span> <span class="name">tickMargin</span>;
<span class="name">ctx</span>.<span class="name">moveTo</span>(<span class="name">xStart</span>, <span class="number">0</span>);
<span class="name">ctx</span>.<span class="name">lineTo</span>(<span class="name">xStart</span>, <span class="name">canvas</span>.<span class="name">height</span>);
<span class="keyword">for</span> (<span class="name">i</span> <span class="operator">=</span> <span class="number">0</span>; <span class="name">i</span> <span class="operator"><</span> <span class="number">12</span>; i++) {
<span class="name">ctx</span>.<span class="name">moveTo</span>(<span class="name">xStart</span>, <span class="name">canvas</span>.<span class="name">yGridOffset</span> <span class="operator">+</span> <span class="name">i</span> <span class="operator">*</span> <span class="name">canvas</span>.<span class="name">yGridStep</span>);
<span class="name">ctx</span>.<span class="name">lineTo</span>(<span class="name">canvas</span>.<span class="name">width</span>, <span class="name">canvas</span>.<span class="name">yGridOffset</span> <span class="operator">+</span> <span class="name">i</span> <span class="operator">*</span> <span class="name">canvas</span>.<span class="name">yGridStep</span>);
}
<span class="name">ctx</span>.<span class="name">moveTo</span>(<span class="number">0</span>, <span class="name">canvas</span>.<span class="name">yGridOffset</span> <span class="operator">+</span> <span class="number">9</span> <span class="operator">*</span> <span class="name">canvas</span>.<span class="name">yGridStep</span>);
<span class="name">ctx</span>.<span class="name">lineTo</span>(<span class="name">canvas</span>.<span class="name">width</span>, <span class="name">canvas</span>.<span class="name">yGridOffset</span> <span class="operator">+</span> <span class="number">9</span> <span class="operator">*</span> <span class="name">canvas</span>.<span class="name">yGridStep</span>);
<span class="name">ctx</span>.<span class="name">closePath</span>();
<span class="name">ctx</span>.<span class="name">stroke</span>();
<span class="name">ctx</span>.<span class="name">restore</span>();
}
<span class="comment">// Returns a shortened, readable version of the potentially</span>
<span class="comment">// large volume number.</span>
<span class="keyword">function</span> <span class="name">volumeToString</span>(<span class="name">value</span>) {
<span class="keyword">if</span> (<span class="name">value</span> <span class="operator"><</span> <span class="number">1000</span>)
<span class="keyword">return</span> <span class="name">value</span>;
var <span class="name">exponent</span> = <span class="name">parseInt</span>(<span class="name">Math</span>.<span class="name">log</span>(<span class="name">value</span>) <span class="operator">/</span> <span class="name">Math</span>.<span class="name">log</span>(<span class="number">1000</span>));
var <span class="name">shortVal</span> = <span class="name">parseFloat</span>(<span class="name">parseFloat</span>(<span class="name">value</span>) <span class="operator">/</span> <span class="name">Math</span>.<span class="name">pow</span>(<span class="number">1000</span>, <span class="name">exponent</span>)).<span class="name">toFixed</span>(<span class="number">1</span>);
<span class="comment">// Drop the decimal point on 3-digit values to make it fit</span>
<span class="keyword">if</span> (<span class="name">shortVal</span> <span class="operator">>=</span> <span class="number">100.0</span>) {
<span class="name">shortVal</span> <span class="operator">=</span> <span class="name">parseFloat</span>(<span class="name">shortVal</span>).<span class="name">toFixed</span>(<span class="number">0</span>);
}
<span class="keyword">return</span> <span class="name">shortVal</span> <span class="operator">+</span> <span class="string">"KMBTG"</span>.<span class="name">charAt</span>(<span class="name">exponent</span> <span class="operator">-</span> <span class="number">1</span>);
}
<span class="keyword">function</span> <span class="name">drawScales</span>(<span class="name">ctx</span>, high, low, vol)
{
<span class="name">ctx</span>.<span class="name">save</span>();
<span class="name">ctx</span>.<span class="name">strokeStyle</span> <span class="operator">=</span> <span class="string">"#888888"</span>;
<span class="name">ctx</span>.<span class="name">font</span> <span class="operator">=</span> <span class="string">"10px Open Sans"</span>
<span class="name">ctx</span>.<span class="name">beginPath</span>();
<span class="comment">// prices on y-axis</span>
var <span class="name">x</span> = <span class="name">canvas</span>.<span class="name">width</span> <span class="operator">-</span> <span class="name">tickMargin</span> <span class="operator">+</span> <span class="number">3</span>;
var <span class="name">priceStep</span> = (<span class="name">high</span> <span class="operator">-</span> <span class="name">low</span>) <span class="operator">/</span> <span class="number">9.0</span>;
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">i</span> = <span class="number">0</span>; <span class="name">i</span> <span class="operator"><</span> <span class="number">10</span>; <span class="name">i</span> <span class="operator">+=</span> <span class="number">2</span>) {
var <span class="name">price</span> = <span class="name">parseFloat</span>(<span class="name">high</span> <span class="operator">-</span> <span class="name">i</span> <span class="operator">*</span> <span class="name">priceStep</span>).<span class="name">toFixed</span>(<span class="number">1</span>);
<span class="name">ctx</span>.<span class="name">text</span>(<span class="name">price</span>, <span class="name">x</span>, <span class="name">canvas</span>.<span class="name">yGridOffset</span> <span class="operator">+</span> <span class="name">i</span> <span class="operator">*</span> <span class="name">yGridStep</span> <span class="operator">-</span> <span class="number">2</span>);
}
<span class="comment">// volume scale</span>
<span class="keyword">for</span> (<span class="name">i</span> <span class="operator">=</span> <span class="number">0</span>; <span class="name">i</span> <span class="operator"><</span> <span class="number">3</span>; i++) {
var <span class="name">volume</span> = <span class="name">volumeToString</span>(<span class="name">vol</span> <span class="operator">-</span> (<span class="name">i</span> <span class="operator">*</span> (<span class="name">vol</span><span class="operator">/</span><span class="number">3</span>)));
<span class="name">ctx</span>.<span class="name">text</span>(<span class="name">volume</span>, <span class="name">x</span>, <span class="name">canvas</span>.<span class="name">yGridOffset</span> <span class="operator">+</span> (<span class="name">i</span> <span class="operator">+</span> <span class="number">9</span>) <span class="operator">*</span> <span class="name">yGridStep</span> <span class="operator">+</span> <span class="number">10</span>);
}
<span class="name">ctx</span>.<span class="name">closePath</span>();
<span class="name">ctx</span>.<span class="name">stroke</span>();
<span class="name">ctx</span>.<span class="name">restore</span>();
}
<span class="keyword">function</span> <span class="name">drawPrice</span>(<span class="name">ctx</span>, from, to, color, price, points, highest, lowest)
{
<span class="name">ctx</span>.<span class="name">save</span>();
<span class="name">ctx</span>.<span class="name">globalAlpha</span> <span class="operator">=</span> <span class="number">0.7</span>;
<span class="name">ctx</span>.<span class="name">strokeStyle</span> <span class="operator">=</span> <span class="name">color</span>;
<span class="name">ctx</span>.<span class="name">lineWidth</span> <span class="operator">=</span> <span class="name">numPoints</span> <span class="operator">></span> <span class="number">200</span> ? <span class="number">1</span> : <span class="number">3</span>
<span class="name">ctx</span>.<span class="name">beginPath</span>();
var <span class="name">end</span> = <span class="name">points</span>.<span class="name">length</span>;
var <span class="name">range</span> = <span class="name">highest</span> <span class="operator">-</span> <span class="name">lowest</span>;
<span class="keyword">if</span> (<span class="name">range</span> <span class="operator">==</span> <span class="number">0</span>) {
<span class="name">range</span> <span class="operator">=</span> <span class="number">1</span>;
}
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">i</span> = <span class="number">0</span>; <span class="name">i</span> <span class="operator"><</span> <span class="name">end</span>; <span class="name">i</span> <span class="operator">+=</span> <span class="name">pixelSkip</span>) {
var <span class="name">x</span> = <span class="name">points</span>[<span class="name">i</span>].<span class="name">x</span>;
var <span class="name">y</span> = <span class="name">points</span>[<span class="name">i</span>][<span class="name">price</span>];
var <span class="name">h</span> = <span class="number">9</span> <span class="operator">*</span> <span class="name">yGridStep</span>;
<span class="name">y</span> <span class="operator">=</span> <span class="name">h</span> <span class="operator">*</span> (<span class="name">lowest</span> <span class="operator">-</span> <span class="name">y</span>)<span class="operator">/</span><span class="name">range</span> <span class="operator">+</span> <span class="name">h</span> <span class="operator">+</span> <span class="name">yGridOffset</span>;
<span class="keyword">if</span> (<span class="name">i</span> <span class="operator">==</span> <span class="number">0</span>) {
<span class="name">ctx</span>.<span class="name">moveTo</span>(<span class="name">x</span>, <span class="name">y</span>);
} <span class="keyword">else</span> {
<span class="name">ctx</span>.<span class="name">lineTo</span>(<span class="name">x</span>, <span class="name">y</span>);
}
}
<span class="name">ctx</span>.<span class="name">stroke</span>();
<span class="name">ctx</span>.<span class="name">restore</span>();
}
<span class="keyword">function</span> <span class="name">drawVolume</span>(<span class="name">ctx</span>, from, to, color, price, points, highest)
{
<span class="name">ctx</span>.<span class="name">save</span>();
<span class="name">ctx</span>.<span class="name">fillStyle</span> <span class="operator">=</span> <span class="name">color</span>;
<span class="name">ctx</span>.<span class="name">globalAlpha</span> <span class="operator">=</span> <span class="number">0.8</span>;
<span class="name">ctx</span>.<span class="name">lineWidth</span> <span class="operator">=</span> <span class="number">0</span>;
<span class="name">ctx</span>.<span class="name">beginPath</span>();
var <span class="name">end</span> = <span class="name">points</span>.<span class="name">length</span>;
var <span class="name">margin</span> = <span class="number">0</span>;
<span class="keyword">if</span> (<span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"month"</span> <span class="operator">||</span> <span class="name">chart</span>.<span class="name">activeChart</span> <span class="operator">===</span> <span class="string">"week"</span>) {
<span class="name">margin</span> <span class="operator">=</span> <span class="number">8</span>;
<span class="name">ctx</span>.<span class="name">shadowOffsetX</span> <span class="operator">=</span> <span class="number">4</span>;
<span class="name">ctx</span>.<span class="name">shadowBlur</span> <span class="operator">=</span> <span class="number">3.5</span>;
<span class="name">ctx</span>.<span class="name">shadowColor</span> <span class="operator">=</span> <span class="name">Qt</span>.<span class="name">darker</span>(<span class="name">color</span>);
}
<span class="comment">// To match the volume graph with price grid, skip drawing the initial</span>
<span class="comment">// volume of the first day on chart.</span>
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">i</span> = <span class="number">1</span>; <span class="name">i</span> <span class="operator"><</span> <span class="name">end</span>; <span class="name">i</span> <span class="operator">+=</span> <span class="name">pixelSkip</span>) {
var <span class="name">x</span> = <span class="name">points</span>[<span class="name">i</span> <span class="operator">-</span> <span class="number">1</span>].<span class="name">x</span>;
var <span class="name">y</span> = <span class="name">points</span>[<span class="name">i</span>][<span class="name">price</span>];
<span class="name">y</span> <span class="operator">=</span> <span class="name">canvas</span>.<span class="name">height</span> <span class="operator">*</span> (<span class="name">y</span> <span class="operator">/</span> <span class="name">highest</span>);
<span class="name">y</span> <span class="operator">=</span> <span class="number">3</span> <span class="operator">*</span> <span class="name">y</span> <span class="operator">/</span> <span class="number">12</span>;
<span class="name">ctx</span>.<span class="name">fillRect</span>(<span class="name">x</span>, <span class="name">canvas</span>.<span class="name">height</span> <span class="operator">-</span> <span class="name">y</span> <span class="operator">+</span> <span class="name">yGridOffset</span>,
<span class="name">canvas</span>.<span class="name">xGridStep</span> <span class="operator">-</span> <span class="name">margin</span>, <span class="name">y</span>);
}
<span class="name">ctx</span>.<span class="name">stroke</span>();
<span class="name">ctx</span>.<span class="name">restore</span>();
}
<span class="keyword">function</span> <span class="name">drawError</span>(<span class="name">ctx</span>, msg)
{
<span class="name">ctx</span>.<span class="name">save</span>();
<span class="name">ctx</span>.<span class="name">strokeStyle</span> <span class="operator">=</span> <span class="string">"#888888"</span>;
<span class="name">ctx</span>.<span class="name">font</span> <span class="operator">=</span> <span class="string">"24px Open Sans"</span>
<span class="name">ctx</span>.<span class="name">textAlign</span> <span class="operator">=</span> <span class="string">"center"</span>
<span class="name">ctx</span>.<span class="name">shadowOffsetX</span> <span class="operator">=</span> <span class="number">4</span>;
<span class="name">ctx</span>.<span class="name">shadowOffsetY</span> <span class="operator">=</span> <span class="number">4</span>;
<span class="name">ctx</span>.<span class="name">shadowBlur</span> <span class="operator">=</span> <span class="number">1.5</span>;
<span class="name">ctx</span>.<span class="name">shadowColor</span> <span class="operator">=</span> <span class="string">"#aaaaaa"</span>;
<span class="name">ctx</span>.<span class="name">beginPath</span>();
<span class="name">ctx</span>.<span class="name">fillText</span>(<span class="name">msg</span>, (<span class="name">canvas</span>.<span class="name">width</span> <span class="operator">-</span> <span class="name">tickMargin</span>) <span class="operator">/</span> <span class="number">2</span>,
(<span class="name">canvas</span>.<span class="name">height</span> <span class="operator">-</span> <span class="name">yGridOffset</span> <span class="operator">-</span> <span class="name">yGridStep</span>) <span class="operator">/</span> <span class="number">2</span>);
<span class="name">ctx</span>.<span class="name">closePath</span>();
<span class="name">ctx</span>.<span class="name">stroke</span>();
<span class="name">ctx</span>.<span class="name">restore</span>();
}
<span class="name">onPaint</span>: {
<span class="name">numPoints</span> <span class="operator">=</span> <span class="name">stockModel</span>.<span class="name">indexOf</span>(<span class="name">chart</span>.<span class="name">startDate</span>);
<span class="keyword">if</span> (<span class="name">chart</span>.<span class="name">gridSize</span> <span class="operator">==</span> <span class="number">0</span>)
<span class="name">chart</span>.<span class="name">gridSize</span> <span class="operator">=</span> <span class="name">numPoints</span>
var <span class="name">ctx</span> = <span class="name">canvas</span>.<span class="name">getContext</span>(<span class="string">"2d"</span>);
<span class="name">ctx</span>.<span class="name">globalCompositeOperation</span> <span class="operator">=</span> <span class="string">"source-over"</span>;
<span class="name">ctx</span>.<span class="name">lineWidth</span> <span class="operator">=</span> <span class="number">1</span>;
<span class="name">drawBackground</span>(<span class="name">ctx</span>);
<span class="keyword">if</span> (!<span class="name">stockModel</span>.<span class="name">ready</span>) {
<span class="name">drawError</span>(<span class="name">ctx</span>, <span class="string">"No data available."</span>);
<span class="keyword">return</span>;
}
var <span class="name">highestPrice</span> = <span class="number">0</span>;
var <span class="name">highestVolume</span> = <span class="number">0</span>;
var <span class="name">lowestPrice</span> = -<span class="number">1</span>;
var <span class="name">points</span> = [];
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">i</span> = <span class="name">numPoints</span>, <span class="name">j</span> = <span class="number">0</span>; <span class="name">i</span> <span class="operator">>=</span> <span class="number">0</span> ; <span class="name">i</span> <span class="operator">-=</span> <span class="name">pixelSkip</span>, <span class="name">j</span> <span class="operator">+=</span> <span class="name">pixelSkip</span>) {
var <span class="name">price</span> = <span class="name">stockModel</span>.<span class="name">get</span>(<span class="name">i</span>);
<span class="keyword">if</span> (<span class="name">parseFloat</span>(<span class="name">highestPrice</span>) <span class="operator"><</span> <span class="name">parseFloat</span>(<span class="name">price</span>.<span class="name">high</span>))
<span class="name">highestPrice</span> <span class="operator">=</span> <span class="name">price</span>.<span class="name">high</span>;
<span class="keyword">if</span> (<span class="name">parseInt</span>(<span class="name">highestVolume</span>, <span class="number">10</span>) <span class="operator"><</span> <span class="name">parseInt</span>(<span class="name">price</span>.<span class="name">volume</span>, <span class="number">10</span>))
<span class="name">highestVolume</span> <span class="operator">=</span> <span class="name">price</span>.<span class="name">volume</span>;
<span class="keyword">if</span> (<span class="name">lowestPrice</span> <span class="operator"><</span> <span class="number">0</span> <span class="operator">||</span> <span class="name">parseFloat</span>(<span class="name">lowestPrice</span>) <span class="operator">></span> <span class="name">parseFloat</span>(<span class="name">price</span>.<span class="name">low</span>))
<span class="name">lowestPrice</span> <span class="operator">=</span> <span class="name">price</span>.<span class="name">low</span>;
<span class="name">points</span>.<span class="name">push</span>({
x: <span class="name">j</span> <span class="operator">*</span> <span class="name">xGridStep</span>,
open: <span class="name">price</span>.<span class="name">open</span>,
close: <span class="name">price</span>.<span class="name">close</span>,
high: <span class="name">price</span>.<span class="name">high</span>,
low: <span class="name">price</span>.<span class="name">low</span>,
volume: <span class="name">price</span>.<span class="name">volume</span>
});
}
<span class="keyword">if</span> (<span class="name">settings</span>.<span class="name">drawHighPrice</span>)
<span class="name">drawPrice</span>(<span class="name">ctx</span>, <span class="number">0</span>, <span class="name">numPoints</span>, <span class="name">settings</span>.<span class="name">highColor</span>, <span class="string">"high"</span>, <span class="name">points</span>, <span class="name">highestPrice</span>, <span class="name">lowestPrice</span>);
<span class="keyword">if</span> (<span class="name">settings</span>.<span class="name">drawLowPrice</span>)
<span class="name">drawPrice</span>(<span class="name">ctx</span>, <span class="number">0</span>, <span class="name">numPoints</span>, <span class="name">settings</span>.<span class="name">lowColor</span>, <span class="string">"low"</span>, <span class="name">points</span>, <span class="name">highestPrice</span>, <span class="name">lowestPrice</span>);
<span class="keyword">if</span> (<span class="name">settings</span>.<span class="name">drawOpenPrice</span>)
<span class="name">drawPrice</span>(<span class="name">ctx</span>, <span class="number">0</span>, <span class="name">numPoints</span>,<span class="name">settings</span>.<span class="name">openColor</span>, <span class="string">"open"</span>, <span class="name">points</span>, <span class="name">highestPrice</span>, <span class="name">lowestPrice</span>);
<span class="keyword">if</span> (<span class="name">settings</span>.<span class="name">drawClosePrice</span>)
<span class="name">drawPrice</span>(<span class="name">ctx</span>, <span class="number">0</span>, <span class="name">numPoints</span>, <span class="name">settings</span>.<span class="name">closeColor</span>, <span class="string">"close"</span>, <span class="name">points</span>, <span class="name">highestPrice</span>, <span class="name">lowestPrice</span>);
<span class="name">drawVolume</span>(<span class="name">ctx</span>, <span class="number">0</span>, <span class="name">numPoints</span>, <span class="name">settings</span>.<span class="name">volumeColor</span>, <span class="string">"volume"</span>, <span class="name">points</span>, <span class="name">highestVolume</span>);
<span class="name">drawScales</span>(<span class="name">ctx</span>, <span class="name">highestPrice</span>, <span class="name">lowestPrice</span>, <span class="name">highestVolume</span>);
}
}
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> {
<span class="name">id</span>: <span class="name">fromDate</span>
<span class="name">color</span>: <span class="string">"#000000"</span>
<span class="name">font</span>.family: <span class="name">Settings</span>.<span class="name">fontFamily</span>
<span class="name">font</span>.pointSize: <span class="number">8</span>
<span class="name">Layout</span>.alignment: <span class="name">Qt</span>.<span class="name">AlignLeft</span>
<span class="name">text</span>: <span class="string">"| "</span> <span class="operator">+</span> <span class="name">startDate</span>.<span class="name">toDateString</span>()
}
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> {
<span class="name">id</span>: <span class="name">toDate</span>
<span class="name">color</span>: <span class="string">"#000000"</span>
<span class="name">font</span>.family: <span class="name">Settings</span>.<span class="name">fontFamily</span>
<span class="name">font</span>.pointSize: <span class="number">8</span>
<span class="name">Layout</span>.alignment: <span class="name">Qt</span>.<span class="name">AlignRight</span>
<span class="name">Layout</span>.rightMargin: <span class="name">canvas</span>.<span class="name">tickMargin</span>
<span class="name">Layout</span>.columnSpan: <span class="number">5</span>
<span class="name">text</span>: <span class="name">endDate</span>.<span class="name">toDateString</span>() <span class="operator">+</span> <span class="string">" |"</span>
}
}
}
</pre>
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<!-- @@@demos/stocqt/content/StockChart.qml -->
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<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property
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