[] Sets up the world coordinates of the edges of the viewport.
[] xmin (PLFLT, input):[]The world x coordinate of the left-hand edge of the viewport.
[] xmax (PLFLT, input):[]The world x coordinate of the right-hand edge of the viewport.
[] ymin (PLFLT, input):[]The world y coordinate of the bottom edge of the viewport.
[] ymax (PLFLT, input):[]The world y coordinate of the top edge of the viewport.
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