ccontext:SetLineWidth(width)
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 ccontext:SetLineWidth(). The simplest usage
makes both of these spaces identical. That is, if there is no
change to the CTM between a call to ccontext:SetLineWidth() and the
stroking operation, then one can just pass user-space values to
ccontext:SetLineWidth() and ignore this note.
As with the other stroke parameters, the current line width is examined by ccontext:Stroke() and ccontext:StrokeExtents(), but does not have any effect during path construction.
The default line width value is 2.0.