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Controlling the color of crosshair raised by ginput

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Naum Derzhi
Naum Derzhi 2017 年 12 月 1 日
コメント済み: Image Analyst 2021 年 2 月 27 日
Hello, I need to use ginput. It "raises raises crosshair in the axes" - which is fine. Unfortunately, this crosshair is black, and in the axes where I need this function the background is, usually, black too, so the crosshair is very difficult to see. Changing background is not really an option. Until now I used an old version of Matlab, where this crosshair was drawn in XOR mode, and therefore this problem did not appear. Now i am forced to upgrade to the most current version, and now the XOR is banished by Mathworks. This creates problems in the described use case, but also in other use cases. Any ideas will be greatly appreciated.
Thank you,
Naum Derzhi


Image Analyst
Image Analyst 2017 年 12 月 2 日
You need to modify the built-in ginput() function since they forgot to add this incredibly obvious and needed option of color. For example see my attached code where I changed the [0,0,0] to [1,1,1] (white). Go to line 283
crossHair(k) = uicontrol(fig, 'Style', 'text', 'Visible', 'off', 'Units', 'pixels', 'BackgroundColor', [1 1 1], 'HandleVisibility', 'off', 'HitTest', 'off'); %#ok<AGROW>
and change the color from [1,1,1] to what you want. Those are the R, G, B values in a range of 0 to 1. Then in your code, be sure to call ginputWhite instead of ginput().
You could even make a cross hair by calling plot() instead of uicontrol() and specify a dashed line if you want.
  10 件のコメント
Image Analyst
Image Analyst 2021 年 2 月 27 日
Place it in the folder where your own, custom main m-file is, or in any other folder where you keep custom m-files (utilities) that is on your search path. Just be sure not to call it ginput.m. If you still don't understand, then tell me what folder is the m-file that you want to call ginputWhite in? Ok, put ginputWhite.m in THAT folder.


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