In MATLAB App Designer, plot commands are typically queued for rendering. When a screen capture command is executed immediately after these plot commands, it may run before the rendering is complete, resulting in an incomplete or incorrect screenshot. This behaviour explains why introducing apauseor a breakpoint appears to resolve the issue as it allows sufficient time for the plots to finish rendering before the capture occurs. For more information regarding the same, refer to the following documentation:
A better approach is to explicitly force MATLAB to complete all pending graphics updates before proceeding. This can be achieved using the“drawnow”function, which flushes the graphics event queue and ensures that all rendering tasks are completed before moving to the next line of code.
To address the issue, simply insert the following line before “capturescreen” function is called:
drawnow;
This ensures that all plots are fully rendered before the screen is captured. Below is the image that I obtained when trying to run the code after adding the above line of code:
For more information, please refer to the following MATLAB documentation:
