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xc = 0.5 yc = 0.5 radius = 0.4 angle1 = 45.0 * (M_PI/180.0) #/* angles are specified */ angle2 = 180.0 * (M_PI/180.0) #/* in radians */ snippet_normalize (cr, width, height) cr.arc_negative (xc, yc, radius, angle1, angle2) cr.stroke () #/* draw helping lines */ cr.set_source_rgba (1,0.2,0.2,0.6) cr.arc (xc, yc, 0.05, 0, 2*M_PI) cr.fill () cr.set_line_width (0.03) cr.arc (xc, yc, radius, angle1, angle1) cr.line_to (xc, yc) cr.arc (xc, yc, radius, angle2, angle2) cr.line_to (xc, yc) cr.stroke () #cr.stroke (10)