SecuriDesign is a set of macros for CorelDRAW 10/11 that allow you to create various designs used frequently in security printing (on certificates, bank notes, documents, and so on). With SecuriDesign now it is very easy to create guilloche patterns right in CorelDRAW document.

SecuriDesign contains three basic modules:

• Contour Generator
• Pattern Generator
• Function Editor

Contour Generator is similar to the Contour effect in CorelDRAW with the exception of CorelDRAW's effect creating contour lines with constant offset from a control object. SecuriDesign uses harmonic functions to odulate the offset and thus easily generates base curves for various design elements such as rosettes shown in the logo above.

Pattern Generator is used to produce guilloche "fills" between two selected curves in CorelDRAW document. You need to have two curve shapes which are used as envelopes for the pattern. The resulting fill follows the path of both envelopes. You can use either the contour curves created by the Contour Generator or you can draw any curves using CorelDRAW's drawing tools. Pattern Generator allows to generate complex designs in one step.

Function Editor is used to create mathematical functions used by the above two modules when creating contours and patterns. You specify a function description as a set of Fourier coefficients or you can draw a function in CorelDRAW document and have the Function Editor to "digitize" the function and produce the coefficients automatically to best fit the representation you drew.