def draw(cr)
return if (RECT_WIDTH <= 0 || RECT_HEIGHT <= 0)
if (RECT_WIDTH / 2 < RADIUS)
if (RECT_HEIGHT / 2 < RADIUS)
cr.move_to(X0, (Y0 + Y1) / 2)
cr.curve_to(X0 ,Y0, X0, Y0, (X0 + X1) / 2, Y0)
cr.curve_to(X1, Y0, X1, Y0, X1, (Y0 + Y1) / 2)
cr.curve_to(X1, Y1, X1, Y1, (X1 + X0) / 2, Y1)
cr.curve_to(X0, Y1, X0, Y1, X0, (Y0 + Y1) / 2)
else
cr.move_to(X0, Y0 + RADIUS)
cr.curve_to(X0 ,Y0, X0, Y0, (X0 + X1) / 2, Y0)
cr.curve_to(X1, Y0, X1, Y0, X1, Y0 + RADIUS)
cr.line_to(X1 , Y1 - RADIUS)
cr.curve_to(X1, Y1, X1, Y1, (X1 + X0) / 2, Y1)
cr.curve_to(X0, Y1, X0, Y1, X0, Y1- RADIUS)
end
else
if (RECT_HEIGHT / 2 < RADIUS)
cr.move_to(X0, (Y0 + Y1) / 2)
cr.curve_to(X0, Y0, X0 , Y0, X0 + RADIUS, Y0)
cr.line_to(X1 - RADIUS, Y0)
cr.curve_to(X1, Y0, X1, Y0, X1, (Y0 + Y1) / 2)
cr.curve_to(X1, Y1, X1, Y1, X1 - RADIUS, Y1)
cr.line_to(X0 + RADIUS, Y1)
cr.curve_to(X0, Y1, X0, Y1, X0, (Y0 + Y1) / 2)
else
cr.move_to(X0, Y0 + RADIUS)
cr.curve_to(X0 , Y0, X0 , Y0, X0 + RADIUS, Y0)
cr.line_to(X1 - RADIUS, Y0)
cr.curve_to(X1, Y0, X1, Y0, X1, Y0 + RADIUS)
cr.line_to(X1 , Y1 - RADIUS)
cr.curve_to(X1, Y1, X1, Y1, X1 - RADIUS, Y1)
cr.line_to(X0 + RADIUS, Y1)
cr.curve_to(X0, Y1, X0, Y1, X0, Y1- RADIUS)
end
end
cr.close_path
cr.set_source_rgba(0.5,0.5,1)
cr.fill_preserve
cr.set_source_rgba(0.5, 0, 0, 0.5)
cr.stroke
end