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    <title>RGraph: Javascript charts and graph library - About canvas color definitions</title>
    
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        <a href="../index.html">RGraph: Javascript charts and graph library</a>
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        About canvas color definitions
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    <h1>RGraph: Javascript charts and graph library - About canvas color definitions</h1>

    <script>
        if (RGraph.isIE8()) {
            document.write('<div style="background-color: #fee; border: 2px dashed red; padding: 5px"><b>Important</b><br /><br /> Internet Explorer 8 does not natively support the HTML5 canvas tag, so if you want to see the charts, you can either:<ul><li>Install <a href="http://code.google.com/chrome/chromeframe/">Google Chrome Frame</a></li><li>Use ExCanvas. This is provided in the RGraph Archive.</li><li>Use another browser entirely. Your choices are Firefox 3.5+, Chrome 2+, Safari 4+ or Opera 10.5+. </li></ul> <b>Note:</b> Internet Explorer 9 fully supports the canvas tag. Click <a href="http://support.rgraph.net/message/rgraph-in-internet-explorer-9.html" target="_blank">here</a> to see some screenshots.</div>');
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    <p>
        You will probably want to know the different ways you can define a color. There are a few
        ways which you can use, all of which are quite straight-forward.
    </p>

    <ul id="colors">
        <li><a href="#named">Named colors</a></li>
        <li><a href="#hex">Hex values</a></li>
        <li><a href="#rgb">RGB values</a></li>
        <li><a href="#rgba">RGBA values</a></li>
        <li><a href="#hsl">HSL values</a></li>
        <li><a href="#hsla">HSLA values</a></li>
        <li><a href="#lgradients">Linear gradients</a></li>
        <li><a href="#rgradients">Radial gradients</a></li>
        <li><a href="#info">More information</a></li>
    </ul>
    
    <a name="named"></a>
    <br />&nbsp;<br />
    <h2>Named colors</h2>
    
    <p>
        The first, and easiest, is to use named colors. This gives you a range of color values that have been predefined for you. Eg:
    </p>
    
    <pre class="code">myObject.Set('chart.colors', ['red', 'blue']);</pre>

    <a name="hex"></a>
    <br />&nbsp;<br />
    <h2>Hex values</h2>
    
    <p>
        The next, is straight forward hex values like you can use in normal CSS. These consist of a hash sign,
        followed by three or six hexadecimal characters. Eg:
    </p>

    <pre class="code">myObject.Set('chart.colors', ['#f00', '#0000ff']);</pre>
    
    <a name="rgb"></a>
    <br />&nbsp;<br />
    <h2>RGB values</h2>
    
    <p>
        Also as used in CSS, RGB values are the same as what you can use in CSS. Eg:
    </p>
    
    <pre class="code">myObject.Set('chart.colors', ['rgb(255,0,0)', 'rgb(0,0,255)']);</pre>

    <a name="rgba"></a>
    <br />&nbsp;<br />
    <h2>RGBA values</h2>
    
    <p>
        Probably new to most people, is rgba(). Similar to regular rgb() values, but with a fourth value that allows you to specify the
        alpha value, which stipulates how transparent the color is. An alpha value of 0 is totally transparent, and a value of 1, is
        totally opaque (ie. you can't see through it). With a value of 1, rgba() acts exactly like rgb(). This example gives you red
        and blue colors that are semi-transparent:
    </p>
    
    <pre class="code">myObject.Set('chart.colors', ['rgba(255,0,0,0.5)', 'rgba(0,0,255,0.5)']);</pre>

    <a name="hsl"></a>
    <br />&nbsp;<br />
    <h2>HSL() values</h2>
    
    <p>
        Also probably quite new to you, are hsl() values. Much like rgb(), but instead of red green and blue, it allows you to specify
        the Hue, Saturation and Light values instead. For example:
    </p>
    
    <pre class="code">myObject.Set('chart.colors', ['hsl(255, 100%, 50%)', 'hsl(169, 100%, 50%)']);</pre>

    <a name="hsla"></a>
    <br />&nbsp;<br />
    <h2>HSLA() values</h2>

    <p>
        Much like rgb() and rgba(), hsl() has a corresponding hsla() version, which allows you to specify an alpha (transparency) value.
        Eg:
    </p>
    
    <pre class="code">myObject.Set('chart.colors', ['hsla(255, 100%, 50%, 0.5)', 'hsla(169, 100%, 50%, 0.5)']);</pre>

    <a name="lgradients"></a>
    <br />&nbsp;<br />
    <h2>Linear gradients</h2>
    
    <p>
        Gradients can be used in place of color values. You can create a linear gradient like so:
    </p>
    
    <pre class="code">myGradient = myObject.context.createLinearGradient(0,0,0,250);
myGradient.addColorStop(0, 'red');
myGradient.addColorStop(1, 'blue');</pre>

    <p>
        This creates a gradient that goes from red to blue. The gradient starts at 0,0, and finishes at 0,250. ie A vertical
        gradient. You may not see the whole gradient - that depends on the extent of the shape you're filling. You can use the gradient
        in place of a regular color definition. Eg:
    </p>
    
    <pre class="code">myObject.Set('chart.colors', [myGradient]);</pre>

    <a name="rgradients"></a>
    <br />&nbsp;<br />
    <h2>Radial gradients</h2>

    <p>
        Radial gradients are much like their linear counterparts, but circular, as the name suggests. Eg:
    </p>
    
    <pre class="code">myGradient = myObject.context.createRadialGradient(0,0,0,0,0,100);
myGradient.addColorStop(0, 'red');
myGradient.addColorStop(1, 'blue');
</pre>
    
    <p>
        Instead of four arguments, it takes six - the coordinates of the start point along with the radius, and the coordinates
        of the end point, along with the radius. After it has been created, you can treat as you would a linear gradient:
    </p>

    <pre class="code">myObject.Set('chart.colors', [myGradient]);</pre>

    <a name="info"></a>
    <br />&nbsp;<br />
    <h2>More information</h2>
    
    <p>
        You can read more about CSS3 color definitions  <a href="http://www.w3.org/TR/css3-color/" target="_blank" rel="nofollow">here</a>.
    </p>
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