BoxChart cannot be color coded
lazarus / 55-TAChart

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kiyo · 2023-05-31 01:17

BoxChart cannot be color coded

Add 5 BoxAndWshiskerSeries to the TChart and color code them.

Chart1BoxAndWhiskerSeries1.BoxBrush.Color := clBlue;
Chart1BoxAndWhiskerSeries2.BoxBrush.Color := clYellow;
Chart1BoxAndWhiskerSeries3.BoxBrush.Color := clRed;
Chart1BoxAndWhiskerSeries4.BoxBrush.Color := clGreen;
Chart1BoxAndWhiskerSeries5.BoxBrush.Color := clAqua;

In the Legend display, the 5 Legends are correctly color-coded.
But in MainChart,all BoxChart become clBlue.

In this case, ChartColor has no way of knowing which Box is which
data.
How can I fix it?

OS:Windows10 pro, Lazarus Version:2.2.0

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wp · 2023-05-31 08:10

Without seeing your code, I speculate that you added all values to the
first series. The other series are empty but nevertheless listed in
the legend.

There are two options:
- Use only one series to which you add all data points and specify the
color in the AddXY call (the BoxBrush is ignored in this case)
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i  
Chart1BoxAndWhiskerSeries1.AddXY(0, 1, 2, 3, 4, 5, '', clBlue);  
Chart1BoxAndWhiskerSeries1.AddXY(1, 2, 3, 4, 5, 6, '', clYellow);  
Chart1BoxAndWhiskerSeries1.AddXY(2, 2.5, 3.1, 3.9, 5.1, 5.9, '',
clRed); - Or use a dedicated series for each single data point, do not
use the AddXY color, but control the color by the BoxBrush property
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i  
Chart1BoxAndWhiskerSeries1.AddXY(0, 1, 2, 3, 4, 5); 
Chart1BoxAndWhiskerSeries2.AddXY(1, 2, 3, 4, 5, 6); 
Chart1BoxAndWhiskerSeries3.AddXY(2, 2.5, 3.1, 3.9, 5.1, 5.9);

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kiyo · 2023-05-31 18:35

I was able to solve the problem.
I am amazed at your insight.
Thanks for the good advice.