RE: Using gpp preprocessor to create more easily svg code

Hello Cameron,
 Thank you for your feeback.
 GPP have some limits, it can't define a new macro with a macro argument, and accept only 9 arguments.
 I never find a macro processor to do more, even CPP.
 But macros can be nested, to create more complex macros.
 I use it for animations, filters, and gradients too.
 I give some samples below.
 I learn many about svg with this method, because some websites never give all info about some procedures.
 So i discover that <animateTransform> dont work outside the tagged element to animate, even with the xlink:href.
 <use> dont accept all <animate> tags.
 But <animate> work with all xlink:href.
 So, my macros work with a little model, and can make animations with a simili time line and events depending of other events.
 

 In the exemple below, the _RHD and _RAD macros call _Rd1 and _Rd2 "sub" macros. So nesting is easy and natural.
 

 #define _Rd1 #eval #1+#1
 #define _Rd2 #eval 0-#1-#1
 #define _RHD <path id=#1 d="M #2,#3 a #4 #4 0 0 0 _Rd1(#4),0 a #4 #4 0 0 0 _Rd2(#4),0" #5/>
 #define _RAD <path id=#1 d="M #2,#3  a #4 #4 0 0 1 _Rd1(#4),0 a -#4 #4 0 0 1 _Rd2(#4),0" #5/>
 

 To comment, _RHD and _RAD are macros to define circular paths used for <textpath> or <mpath>. _RHD permit rotating left to right, and _RAD rotating rigth to left.
 

 In the source, a macro call can be an argument in another macro call :
 

 _STY(_st2, _FSS(black,1,none,0) _TSS("Comic sans Ms",1.5cm) _invi;)

 

 The above style definition macro _STY use 3 macro calls :
 _FSS for fill, opacity  and stroke, _TSS for font-family and size
 

 About a simili timeline for animation, look at the sample below :
 

 _INV(gr01,0.1s)
 _VIS(gr02,0.1s)
 _INV(gr02,0.2s)
 _VIS(gr03,0.2s)
 _INV(gr03,0.3s)
 _VIS(gr04,0.3s)
 _INV(gr04,0.4s)
 

 gr01 to gr04 are defined paths. _INV macro give the path invisible
 _VIS macro give the path visible. This 2 macros use <attribute> tag with "begin=" as argument (0.1s to 0.4s).
 

 I will post soon the svg.inc file, and some samples i write.
 

 

 Greetings !
 

 Yves