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Sets/gets pen cap style, supported modes:
- GDK_CAP_NOT_LAST the same as GDK_CAP_BUTT for lines of non-zero width. for zero width lines, the final point on the line will not be drawn.
- GDK_CAP_BUTT the ends of the lines are drawn squared off and extending to the coordinates of the end point.
- GDK_CAP_ROUND the ends of the lines are drawn as semicircles with the diameter equal to the line width and centered at the end point.
- GDK_CAP_PROJECTING the ends of the lines are drawn squared off and extending half the width of the line beyond the end point.
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