There could be two workarounds:
I am attaching a script ‘plotMap.m’ to help you understand with the workflow
1. Construct the map axes, and plot any relevant base map data.
Then, looping over the pie charts:
2. a) Using MFWDTRAN (on the map axes) to get the (x,y) coordinates of the desired chart location given its latitude and longitude.
b) Construct a pie chart in a separate axes and figure. While creating the pie chart, capture the handles array that it returns. This array will contain handles to patches and text objects.
>>fTemp= figure()
>>PieHandles= pie( data );
c) Loop over each element of the “PieHandles” vector and rescale the pie chart by multiplying XData and YData by a constant , for each patch. Add the offset derived in step (2.a) to change the position. You can rescale the labeling by changing the font size.
GET function can be used to find the ‘type’ of the handle object and determine if it is a patch or text. It can also be used to get the values of ’Xdata’ and ‘Ydata’ for the patches or ‘Position’ and ‘FontSize’ for text.SET function can then be used to set the properties as desired.
d) Re-parent each patch and text in the scaled and shifted pie, thus moving it into the map axes. You can use COPYOBJ function to do so.
e) Close the temporary figure “fTemp”
The above mentioned workflow will help attain a scalable workaround to plot pie charts with maps.
If you wish the pie charts to be linked to a fixed Latitude/Longitude and scale as you scroll around or zoom in / zoom out the map, you can consider using PATCHM and LINEM functions. These functions allow you to plot patches and lines on a map. Based on the values for the pie chart, you can calculate the angles and thus the patches that can be used to plot the pie chart. Please refer to the documentation about these functions to learn more about the use.
