Function msDrawLabel

mapdraw.c:2295–2393

** Draws a single label independently of the label cache. No collision avoidance is performed. */

** Draws a single label independently of the label cache. No collision avoidance is performed.
*/
int msDrawLabel(mapObj *map, imageObj *image, pointObj labelPnt, char *string, labelObj *label, double scalefactor)
{
  shapeObj labelPoly;
  lineObj labelPolyLine;
  pointObj labelPolyPoints[5];
  int needLabelPoly=MS_TRUE;

  int label_offset_x, label_offset_y;
  double size;
  rectObj r;

  if(!string) return MS_SUCCESS; /* not an error, just don't need to do anything more */
  if(strlen(string) == 0) return MS_SUCCESS; /* not an error, just don't need to do anything more */

  

  if(label->type == MS_TRUETYPE) {
    size = label->size * scalefactor;
    size = MS_MAX(size, label->minsize*image->resolutionfactor);
    size = MS_MIN(size, label->maxsize*image->resolutionfactor);
  } else {
    size = label->size;
  }
  if(msGetLabelSize(map, label, string, size, &r, NULL)!= MS_SUCCESS)
    return MS_FAILURE;

  label_offset_x = label->offsetx*scalefactor;
  label_offset_y = label->offsety*scalefactor;

  if(label->position != MS_XY) {
    pointObj p;
    int needLabelPoint=MS_TRUE;

    if(label->numstyles > 0) {
      int i;

      for(i=0; i<label->numstyles; i++) {
        if(label->styles[i]->_geomtransform.type == MS_GEOMTRANSFORM_LABELPOINT) {
          if(needLabelPoint) {
            p = get_metrics_line(&labelPnt, label->position, r, label_offset_x, label_offset_y, label->angle, 0, NULL);
            needLabelPoint = MS_FALSE; /* don't re-compute */
          } 
          msDrawMarkerSymbol(&map->symbolset, image, &p, label->styles[i], scalefactor);
        } else if(label->styles[i]->_geomtransform.type == MS_GEOMTRANSFORM_LABELPOLY) {
          if(needLabelPoly) {
            labelPoly.line = &labelPolyLine; /* setup the label polygon structure */
            labelPoly.numlines = 1;
            labelPoly.line->point = labelPolyPoints;
            labelPoly.line->numpoints = 5;
            p = get_metrics_line(&labelPnt, label->position, r, label_offset_x, label_offset_y, label->angle, 1, labelPoly.line);
            needLabelPoint = MS_FALSE; /* don't re-compute */
            needLabelPoly = MS_FALSE;
          }
          msDrawShadeSymbol(&map->symbolset, image, &labelPoly, label->styles[i], scalefactor);
        } else {
          /* TODO: need error msg about unsupported geomtransform */
          return MS_FAILURE;
        }