iis: neg.cpp Source File

00001 #include "text.h"
00002 #include "image.h"
00003 #include "runtime.h"
00004 #include "point.h"
00005 
00009 Value * Runtime::neg(Value * a)
00010 {
00011   if (!a) return NULL;
00012   if (typeid(*a)==typeid(TextValue))
00013     {
00014       TextValue * A = (TextValue*)a;
00015       return new TextValue(-A->number());
00016     }
00017   if (typeid(*a)==typeid(ImageValue))
00018     {
00019       ImageValue * A = (ImageValue*)a;
00020       ImageValue * R = A->deepCopy();
00021       R->negate();
00022       return R;
00023     }
00024   if (typeid(*a)==typeid(PointValue))
00025     {
00026       PointValue * A = (PointValue*)a;
00027       PointValue * R = new PointValue();
00028       R->x=-A->x;
00029       R->y=-A->y;
00030       return R;
00031     }
00032   assert(0);
00033 }