int pdf_begin_pattern (int pdf object, double width, double height, double xstep, double ystep, int painttype)
Starts a new pattern definition and returns a pattern handle. width, and height define the bounding box for the pattern. xstep and ystep give the repeated pattern offsets. painttype=1 means that the pattern has its own colour settings whereas a value of 2 indicates that the current colour is used when the pattern is applied.