Algorithm (Workflow)

This function, pixelofaxis, calculates the pixel position of the current axis within a figure in MATLAB. It is particularly useful for placing UI control objects relative to subplots.

Input Parameters

The function does not take any input parameters.

Output Results

• sp: A vector representing the position and size of the axis in the format [left, bottom, size-x, size-y].
• p0: A vector representing the offset of the axis in the x and y directions.
• ff: A vector representing the scaling factors for the x and y directions.

Algorithm Steps

1. Retrieve the position of the current figure using get(gcf,'Position') and store it in fs.
2. Retrieve the position of the current axis using get(gca,'Position') and store it in ss.
3. Extract the width (dx) and height (dy) of the figure from fs.
4. Calculate the pixel position of the axis within the figure and store it in sp. This is done by scaling the axis position ss with the figure dimensions dx and dy.
5. Retrieve the current axis limits using axis and calculate the range in the x (dx) and y (dy) directions.
6. Calculate the scaling factors fx and fy for the x and y directions, respectively, by dividing the axis size in pixels by the axis range.
7. Calculate the offset x0 and y0 for the axis in the x and y directions, respectively, by dividing the negative pixel position by the scaling factors.
8. Store the offsets in p0 and the scaling factors in ff.

Example Usage

The function can be used to position a UI control relative to a subplot:

subplot(2,2,4);
sp = pixelofaxis;
uicontrol('Style', 'popup', 'String', {'R-Joint', 'P-Joint', 'G-Joint'}, 'Position', sp);