PendContour

Use the PbeginContour and PendContour function to create negative shapes within shapes such as the center of the letter 'O'. PbeginContour begins recording vertices for the shape and PendContour stops recording. The vertices that define a negative shape must "wind" in the opposite direction from the exterior shape. First draw vertices for the exterior shape in clockwise order, then for internal shapes, draw vertices counterclockwise.

These functions can only be used within a PbeginShape/PendShape pair and transformations such as Ptranslate, Protate, and Pscale do not work within a PbeginContour/PendContour pair. It is also not possible to use other shapes, such as Pellipse or Prect within.

Link to original Processing doc