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 Incorrect viewport when x-axis has margin |
| Posted by Xord on Jul-24-2020 09:38 |
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I am using Chart Director C++.
I was drawing a finance chart with some margin set at the right side of the x-axis using Axis->setMargin(). I found out that when I use the zoom function, either click to zoom and drag to zoom, the new viewport is calculated incorrectly. I think the viewport may be calculated without accounting for the extra margin at the end, so it was off-centered. Please advise how to account for the margin change. Thanks. |
| Re: Incorrect viewport when x-axis has margin |
| Posted by Xord on Jul-24-2020 11:26 |
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I have found a solution to this problem.
In CChartViewer, before passing the x coordinates to zoomIn() and zoomAt(), modify the coordinates to "pretend" it was clicked on a chart without margin.
The calculation requires the left position, right position and the width of the plot area. Also the margin width. |
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