cairo/canvas.go
func (v *Context) GetLineWidth() float64 {
	c := C.cairo_get_line_width(v.native())
	return float64(c)
}
func (v *Context) GetLineWidth() float64 {
	c := C.cairo_get_line_width(v.native())
	return float64(c)
}
// GetLineWidth is a wrapper cairo_get_line_width().