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Mark
2 Posts |
 Posted - 08 Apr 2005 : 13:56:35
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| I want to draw a simple bar chart, but I would like to draw negative values in a different color than the positive values. Is this possible without having to create a separate chart element for the negative bars? |
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quinncurtis
1164 Posts |
Posted - 08 Apr 2005 : 14:32:01
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You can use what we refer to as segment attributes to assign a unique color to each bar of a simple bar plot. Below is a simple modification to our SimpleBarChart.cs example from the ChartTabDemo example program, that uses a threshold of 200 instead of your 0. You just run through each bar, look at the assoicated value and assign the appropriate color.
ChartAttribute attrib1 = new ChartAttribute (Color.Green, 0,DashStyle.Solid, Color.Green);
attrib1.SetFillFlag(true);
SimpleBarPlot thePlot1 = new SimpleBarPlot(pTransform1, Dataset1, ChartCalendar.GetCalendarWidthValue(ChartObj.MONTH,8), 0.0,
attrib1, ChartObj.JUSTIFY_CENTER);
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// START OF ADDED CODE
ChartAttribute positiveattrib = new ChartAttribute (Color.Blue, 0,DashStyle.Solid, Color.Blue);
ChartAttribute negativeeattrib = new ChartAttribute (Color.Red, 0,DashStyle.Solid, Color.Red);
double thresholdvalue = 200;
thePlot1.SetSegmentAttributesMode(true);
for (i=0; i < Dataset1.NumberDatapoints; i++)
{
if (Dataset1.YData[i] >= thresholdvalue)
thePlot1.SetSegmentAttributes(i,positiveattrib);
else
thePlot1.SetSegmentAttributes(i,negativeeattrib);
}
// END OF ADDED CODE
chartVu.AddChartObject(thePlot1);
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Different colors for Pos/Neg bars?
