Inking mode
Provide ability to “ink” a line drawing. Provide a means to color fill bounded areas - similar to the way color fill is handled in Procreate as an example. After using the pen tool to define the lines of an illustration - like for example a cartoon character - it would be very helpful to be able to colorize the line drawing by dragging color in to bounded (leak proof) areas created by these overlapping lines.
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Sounds quite similar to the existing Live Paint tools in Illustrator. Have you tried it?