MATLAB: How to change the radius of a circle pointeur

changing circle radiuscircle pointermyginput.m

Hi, I'm using the "myginput.m" function and I would like to change the radius of my circle pointer. However, I haven't succeeded. Would anybody have a or the solution ? Thank you in advance.

Best Answer

This function can set exactly the same pointers as explained in the documentation: See doc figure "pointers" . You cannot set the radius of the circle pointer.
If you want to choose the radius freely, you need to draw the circle by your own.
[EDITED] For creating a 32x32 pointer, see the "PointerShapeCData" point in the posted link.
CData = [ ...
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1; ...
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2; ...
  0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 2, 2, 0, 0; ...
  0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 0, 0, 0, 0, 0, 0; ...
  0, 0, 0, 0, 0, 1, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0; ...
  0, 0, 0, 0, 1, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0; ...
  0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; ...
  0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; ...
  0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; ...
  0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; ...
  0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; ...
  0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; ...
  0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; ...
  1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; ...
  1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; ...
  1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
LUT   = [NaN, 1, 2];   % Transparent, black, white
Shape = LUT(CData + 1);
Shape = cat(2, Shape, fliplr(Shape));
Shape = cat(1, Shape, flipud(Shape));
figure('Pointer', 'custom', 'PointerShapeCData', Shape);
This is a circle with 32 pixels diameter with black pixels and a white circle inside. This is visible on light and dark images. If only the black circle is wanted, use: LUT = [NaN, 1, NaN]
Set the 'PointerShapeHotSpot' to [16, 16]. Note, that the center is not exactly at the midpoint of the circle. To get this create a circle with an odd number of pixels.
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