Function msOffsetPointRelativeTo

mapprimitive.c:702–757

** offsets a point relative to an image position */

** offsets a point relative to an image position
*/
void msOffsetPointRelativeTo(pointObj *point, layerObj *layer)
{
  double x=0, y=0;
  if ( msCheckParentPointer(layer->map,"map")==MS_FAILURE )
    return;
  

  if(layer->transform == MS_TRUE) return; /* nothing to do */

  if(layer->units == MS_PERCENTAGES) {
    point->x *= (layer->map->width-1);
    point->y *= (layer->map->height-1);
  }

  if(layer->transform == MS_FALSE || layer->transform == MS_UL) return; /* done */

  switch(layer->transform) {
  case MS_UC:
    x = (layer->map->width-1)/2;
    y = 0;
    break;
  case MS_UR:
    x = layer->map->width-1;
    y = 0;
    break;
  case MS_CL:
    x = 0;
    y = layer->map->height/2;
    break;
  case MS_CC:
    x = layer->map->width/2;
    y = layer->map->height/2;
    break;
  case MS_CR:
    x = layer->map->width-1;
    y = layer->map->height/2;
    break;
  case MS_LL:
    x = 0;
    y = layer->map->height-1;
    break;
  case MS_LC:
    x = layer->map->width/2;
    y = layer->map->height-1;
    break;
  case MS_LR:
    x = layer->map->width-1;
    y = layer->map->height-1;
    break;
  }

  point->x += x;
  point->y += y;

  return;
}

/*