Can the tool generate a diagram from existing source code? Obviously it would likely require additional input for internal 'headings'. And can the diagrams be a

Can the tool generate a diagram from existing source code? Obviously it would likely require additional input for internal 'headings'. And can the diagrams be automatically 'collapsed' into simpler flow charts? I have two thoughts around this: 1) A lot of 'simple' source code would generate large, complex diagrams - which are likely not very readable, and brings up the same old decries against visual programming. 2) maybe striving for code that works well when converted to a visual language is a good check for code quality.