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performance problem

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juanxiao

5 Posts

Posted - 26 Mar 2004 : 12:07:23

Hi, I have a chart in a one week range(xAxis). And I have a (x, y) value(y is in double) associates with every 36 seconds. So I have 16800 pairs of (x,y) for this chart. I'm currntly using vb.net. It takes 17 seconds to plot. Is there any way to speed it up? I tried both SimpleLinePlot and SimpleScatterPlot. SimpleScatterPlot seems a couple seconds faster. But still too slow.

Thanks!

jx

quinncurtis

1164 Posts

Posted - 26 Mar 2004 : 12:52:46

First thing to realize is the .Net is not a performance language.

Our FAQ section, Question 19, for QCChart2D discusses how compression techniques can speed up rendering of plots with many data points. Using the

int compressXmode = ChartObj.DATACOMRESS_AVERAGE;

int compressYmode = ChartObj.DATACOMRESS_MINMAX;

reducing the number of data points to 1-2K, more in-line with the horizontal resolution of th screen could speed up drawing 5-10 times.

Otherwise there is no switch that will speed things.

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