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POUpdate the y-axis of a brushed area chart
 

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    <p>I am using d3.js, and I'm working on a brushed area chart by modifying <a href="http://bl.ocks.org/1667367">this example</a>. In addition to the x-axis changing based on the brush, I'd like chart's y-axis to be redrawn, based on the y-values of the data that fall within the brush (similar to the behavior of <a href="http://www.google.com/finance?q=INDEXDJX%3a.DJI,INDEXSP%3a.INX,INDEXNASDAQ%3a.IXIC&amp;ei=qCnTULiiJqut0AGYiQE">a Google Finance chart</a>).</p> <p>I have gotten the functionality working, but only in a way that enables the brush to be drawn in both x- and y-space. I did this by first adding a y scale to the <code>brush</code> variable:</p> <pre><code>var brush = d3.svg.brush() .x(x2) .y(y2) .on("brush", brush); </code></pre> <p>This makes <code>brush.extent()</code> return the following multi-dimensional array: <code>[ [x0, y0], [x1, y1] ]</code>. I then use this data in the <code>brush()</code> function to redefine the x- and y- domain for the focus chart:</p> <pre><code>function brush() { var extent = brush.extent(); x.domain(brush.empty() ? x2.domain() : [ extent[0][0], extent[1][0] ]); y.domain(brush.empty() ? y2.domain() : [ extent[0][1], extent[1][1] ]); focus.select("path").attr("d", area); focus.select(".x.axis").call(xAxis); focus.select(".y.axis").call(yAxis); } </code></pre> <p>This works, but by defining the y scale in the brush variable, the user can now drag 'boxes' in the focus chart, rather than only being able to drag west to east, as in the original chart.</p> <p>Essentially, my question is: <strong>how do I get the range of values that fall within a brush's area, rather than the range of the brush's area itself?</strong> Is this even possible?</p> <p>d3's brush documentation is <a href="https://github.com/mbostock/d3/wiki/SVG-Controls#wiki-brush">here</a>.</p>
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