Assign TSubChartTool’s ChartRect is invalid

[liuxs]

Using TChart and TSubChartToolD draws LineSeries (called MainChart and SubChart). The scales and increment of horizontal and vertical axes are the same, respectively, but the sizes of the two charts are different.
I can determine the Width and Height of the SubChart’s ChartRect from the MainChart.ChartWidth and ChartHeight, but assigning SubChart.Charts[0].Chart.ChartRect.Width and Height does not work. By the way, I think that it is difficult to calculate the size of the SubChart, although assigning the TSubChart.Charts[0].Height and Width works.
How to assign the Width and Height of the SubChart’s ChartRect?

[Marc]

Hello,

I've just cross-checked size. The following settings appear correct to set the SubChart Panel size:

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ChartTool1.Charts[0].Chart.Width := 300;
ChartTool1.Charts[0].Chart.Height := 400;

With respect to the ChartRect area, the size challenge is similar to that of the main Chart: depending on data the axis label size (length) may vary and automatically adjust the Chart Rect area. You can fix the Label Size to avoid that from happening.

eg.

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ChartTool1.Charts[0].Chart.LeftAxis.LabelsSize := 30;

Regards,
Marc

[liuxs]

The SubChart and the MainChart are out of proportion in size.
How to make the horizontal and vertical axes of the two charts to be the same scales, respectively?

[Sandra]

Hello,
I think you can use the SubChart SetMinMax method to assign the same scale as principal Chart. The code below shows you how:

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ChartTool1.Charts[0].Chart.Axes.Bottom.SetminMax(Chart1.Axes.Bottom.Minimum, Chart1.Axes.Bottom.Maximum);
ChartTool1.Charts[0].Chart.Axes.Left.SetminMax(Chart1.Axes.Left.Minimum, Chart1.Axes.Left.Maximum);

Also, I have realized you work with vertical axis in the principal Chart. Therefore, you must invert the axis in subChart. The line code below shows you how:

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ChartTool1.Charts[0].Chart.Axes.Left.Inverted:= true;

[liuxs]

Thank you for your reply.
Taking the horizontal axes as an example. If both of the axes increments of the SubChart and MainChart are 400m, but their sizes are different in pixel (see Fig. above). I hope that the ratio of actual increment and screen increment of the two charts are the same.

[Sandra]

Hello liuxs,

Taking the horizontal axes as an example. If both of the axes increments of the SubChart and MainChart are 400m, but their sizes are different in pixel (see Fig. above). I hope that the ratio of actual increment and screen increment of the two charts are the same.

The increment is calculated automatically according the space there is to draw labels, it depends always from size of chart, therefore if the size of chart is reduced the increment is recalculating because the labels don't overlap. In your case, a simple solution is try to reduce the SubChart Font Size, because you can show all labels. The line code below shows you how can do it:

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ChartTool1.Charts[0].Chart.Axes.Bottom.LabelsFont.Size := 5;

Hoping this helps you, otherwise don't hesitate to contact us.
Thanks in advance