Function rotateVectorSymbolPoints

mapgd.c:487–537

}

symbolObj* rotateVectorSymbolPoints(symbolObj *symbol, double angle_rad) {
   double dp_x, dp_y, xcor, ycor;
   double sin_a, cos_a;
   double minx,miny,maxx,maxy;
   symbolObj *newSymbol;
   double TOL=0.00000000001;
   int i;
   
   angle_rad = -angle_rad;
   
   newSymbol = (symbolObj *) msSmallMalloc(sizeof(symbolObj));
   msCopySymbol(newSymbol, symbol, NULL);
   
   sin_a = sin(angle_rad);
   cos_a = cos(angle_rad);

   dp_x = symbol->sizex * .5; /* get the shift vector at 0,0 */
   dp_y = symbol->sizey * .5;

   /* center at 0,0 and rotate; then move back */
   for( i=0;i < symbol->numpoints;i++) {
      /* don't rotate PENUP commands (TODO: should use a constant here) */
      if ((symbol->points[i].x == -99.0) && (symbol->points[i].x == -99.0) ) {
         newSymbol->points[i].x = -99.0;
         newSymbol->points[i].y = -99.0;
         continue;
      }

      newSymbol->points[i].x = dp_x + ((symbol->points[i].x-dp_x)*cos_a - (symbol->points[i].y-dp_y)*sin_a);
      newSymbol->points[i].y = dp_y + ((symbol->points[i].x-dp_x)*sin_a + (symbol->points[i].y-dp_y)*cos_a);
   }

   /* get the new bbox of the symbol, because we need it to get the new dimensions of the new symbol */
   get_bbox(newSymbol->points, newSymbol->numpoints, &minx, &miny, &maxx, &maxy);
   if ( (fabs(minx)>TOL) || (fabs(miny)>TOL) ) {
      xcor = minx*-1.0; /* symbols always start at 0,0 so get the shift vector */
      ycor = miny*-1.0;
      for( i=0;i < newSymbol->numpoints;i++) {
         if ((newSymbol->points[i].x == -99.0) && (newSymbol->points[i].x == -99.0))
            continue;
         newSymbol->points[i].x = newSymbol->points[i].x + xcor;
         newSymbol->points[i].y = newSymbol->points[i].y + ycor;
      }

      /* update the bbox to get the final dimension values for the symbol */
      get_bbox(newSymbol->points, newSymbol->numpoints, &minx, &miny, &maxx, &maxy);
   }
   newSymbol->sizex = maxx;
   newSymbol->sizey = maxy;
   return newSymbol;
}

int renderVectorSymbolGD(imageObj *img, double x, double y, symbolObj *symbol, symbolStyleObj *style) {
   int bRotated = MS_FALSE;