Function msHatchPolygon

mapagg.cpp:969–1026

}

int msHatchPolygon(imageObj *img, shapeObj *poly, double spacing, double width, double angle, colorObj *color) {
   assert(MS_RENDERER_PLUGIN(img->format));
   msComputeBounds(poly);
   int pw=(int)(poly->bounds.maxx-poly->bounds.minx+width*2)+1;
   int ph=(int)(poly->bounds.maxy-poly->bounds.miny+width*2)+1;
   mapserver::path_storage lines = createHatch(pw,ph, angle, spacing);
   lines.transform(mapserver::trans_affine_translation(poly->bounds.minx-width,poly->bounds.miny-width));
   polygon_adaptor polygons(poly);
   shapeObj shape;
   msInitShape(&shape);
   int allocated = 20;
   lineObj line;
   shape.line = &line;
   shape.numlines = 1;
   shape.line[0].point = (pointObj*)msSmallCalloc(allocated,sizeof(pointObj));
   shape.line[0].numpoints = 0;
   mapserver::conv_stroke<mapserver::path_storage> stroke(lines);
   stroke.width(width);
   stroke.line_cap(mapserver::butt_cap);
   //mapserver::conv_clipper<mapserver::path_storage,polygon_adaptor> clipper(*lines,polygons, mapserver::clipper_and);
   //mapserver::conv_clipper<polygon_adaptor,mapserver::path_storage> clipper(polygons,lines, mapserver::clipper_and);
   mapserver::conv_clipper<polygon_adaptor,mapserver::conv_stroke<mapserver::path_storage> > clipper(polygons,stroke, mapserver::clipper_and); 
   clipper.rewind(0);
   
   double x=0,y=0;
   unsigned int cmd, prevCmd=-1;
   while((cmd = clipper.vertex(&x,&y)) != mapserver::path_cmd_stop) {
      switch(cmd) {
      case mapserver::path_cmd_line_to:
         if(shape.line[0].numpoints == allocated) {
            allocated *= 2;
            shape.line[0].point = (pointObj*)msSmallRealloc(shape.line[0].point, allocated*sizeof(pointObj));
         }
         shape.line[0].point[shape.line[0].numpoints].x = x;
         shape.line[0].point[shape.line[0].numpoints].y = y;
         shape.line[0].numpoints++;
         break;
      case mapserver::path_cmd_move_to:
         //assert(shape.line[0].numpoints <= 1 || prevCmd == mapserver::path_cmd_line_to);
         shape.line[0].point[0].x = x;
         shape.line[0].point[0].y = y;
         shape.line[0].numpoints = 1;
         break;
      case mapserver::path_cmd_end_poly|mapserver::path_flags_close:
         if(shape.line[0].numpoints > 2) {
            MS_IMAGE_RENDERER(img)->renderPolygon(img,&shape,color);
         }
         break;
      default:
         assert(0); //WTF?
      }
      prevCmd = cmd;
   }
   free(shape.line[0].point);
   //assert(prevCmd == mapserver::path_cmd_line_to);
   //delete lines;
   return MS_SUCCESS;
}