Sets the current line width within the cairo context. The line width value specifies the diameter of a pen that is circular in user space, (though device-space pen may be an ellipse in general due to scaling/shear/rotation of the CTM). Note: When the description above refers to user space and CTM it refers to the user space and CTM in effect at the time of the stroking operation, not the user space and CTM in effect at the time of the call to cairo_set_line_width(). The simplest usage makes both of these spaces identical. That is, if there is no change to the CTM between a call to cairo_set_line_width() and the stroking operation, then one can just pass user-space values to cairo_set_line_width() and ignore this note. As with the other stroke parameters, the current line width is examined by cairo_stroke(), cairo_stroke_extents(), and cairo_stroke_to_path(), but does not have any effect during path construction. The default line width value is 2.0. Since 1.0

class Context
double width


width double

a line width