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POFlex Charts: Can you use a minimum/maximum point from an IAxis for Cartesian Data Canvas to draw the entire width of the chart?
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  1. POFlex Charts: Can you use a minimum/maximum point from an IAxis for Cartesian Data Canvas to draw the entire width of the chart?
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    copied!<p>I have a chart with a DateTime axis as my horizontal and a Linear Axis for my vertical inside a Adobe Flex Line Chart. I want to use a Cartesian Data Canvas as a background element and draw custom set of background graphics mostly rectangles. When I have more than a single data point, the graphics work perfectly since they are supposed to span the width of the entire chart.</p> <p>When I have only a single data point, however, I can't seem to get the rectangles to draw. Since I want my rectangles to span the entire width of the chart, I was thinking that I could get the x-coordinates from my axis, but this isn't working. </p> <pre><code>var canvasWidth:Number = chtCanvas.width; var canvasHeight:Number = chtCanvas.height; var minPt:Array; var maxPt:Array; var minPtDate:Date; var maxPtDate:Date; var minPtComplete:Point; var maxPtComplete:Point; // This works fine when there is more than 1 data point minPt = chtCanvas.localToData(new Point(0, 0)); maxPt = chtCanvas.localToData(new Point(canvasWidth,canvasHeight)); //This does return a date object, but wont draw below minPtDate = axisDate.minimum; maxPtDate = axisDate.maximum; //This returns NaN for the x minPtComplete = chtCanvas.dataToLocal(minPtDate, axisSalary.minimum); maxPtComplete = chtCanvas.dataToLocal(maxPtDate, axisSalary.maximum); // Also tried this. Also returns NaN for the x value //minPtComplete = chtCanvas.dataToLocal(axisDate.minimum, axisSalary.minumum); //maxPtComplete = chtCanvas.dataToLocal(axisDate.maximum, axisSalary.maximum); </code></pre> <p>My actual drawing method is as follows:</p> <pre><code>// Tried this, works with points &gt;2, does not draw with single data point chtCanvas.drawRect(minPt[0], detail[i].MaxValue, maxPt[0], detail[i].MinValue); //tried this, no effect with single point //chtCanvas.drawRect(minPtDate, detail[i].MaxValue, maxPtDate, detail[i].MinValue); // Tried this, no effect with single point //chtCanvas.drawRect(minPtDate, minPt[1], maxPtDate, detail[i].MinValue); // Tried this also //chtCanvas.drawRect(minPtComplete.x, detail[i].MaxValue, maxPtComplete.x, detail[i].MinValue); </code></pre> <p>In this example, detail is an array collection of salary values and Im using the data value in the array to determine the vertical bounds of my rectangles.</p> <p>I need to draw the rectangles the entire width of the chart (even when there is only a single data point). Thanks</p>
 

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