Specifies how to render the endpoints of the path when stroking.
The default line cap style is CAIRO_LINE_CAP_BUTT.
CAIRO_LINE_CAP_BUTT
start(stop) the line exactly at the start(end) point
CAIRO_LINE_CAP_ROUND
use a round ending, the center of the circle is the end point
CAIRO_LINE_CAP_SQUARE
use squared ending, the center of the square is the end point
Specifies how to render the endpoints of the path when stroking. The default line cap style is CAIRO_LINE_CAP_BUTT. CAIRO_LINE_CAP_BUTT start(stop) the line exactly at the start(end) point CAIRO_LINE_CAP_ROUND use a round ending, the center of the circle is the end point CAIRO_LINE_CAP_SQUARE use squared ending, the center of the square is the end point