Function msUnionLayerWhichShapes

mapunion.c:336–382

}

int msUnionLayerWhichShapes(layerObj *layer, rectObj rect, int isQuery)
{
    int i;
    layerObj* srclayer;
    rectObj srcRect;
    msUnionLayerInfo* layerinfo = (msUnionLayerInfo*)layer->layerinfo;

    if (!layerinfo || !layer->map)
        return MS_FAILURE;

    for (i = 0; i < layerinfo->layerCount; i++)
    {
        layerObj* srclayer = &layerinfo->layers[i];

        if (layer->styleitem && layer->numitems == 0)
        {
            /* need to initialize items */
            msUnionLayerFreeExpressionTokens(srclayer);
            
            /* get only the required items */
            if (msLayerWhichItems(srclayer, MS_FALSE, NULL) != MS_SUCCESS)
                return MS_FAILURE;
        }

        srcRect = rect;
#ifdef USE_PROJ
        if(srclayer->transform == MS_TRUE && srclayer->project && layer->transform == MS_TRUE && layer->project &&msProjectionsDiffer(&(srclayer->projection), &(layer->projection)))
            msProjectRect(&layer->projection, &srclayer->projection, &srcRect); /* project the searchrect to source coords */
#endif        
        layerinfo->status[i] = msLayerWhichShapes(srclayer, srcRect, isQuery);
        if (layerinfo->status[i] == MS_FAILURE)
            return MS_FAILURE;
    }

    layerinfo->layerIndex = 0;
    srclayer = &layerinfo->layers[0];
    
    msFree(layerinfo->classgroup);

    layerinfo->classgroup = NULL;
    layerinfo->nclasses = 0;

    if (srclayer->classgroup && srclayer->numclasses > 0)
        layerinfo->classgroup = msAllocateValidClassGroups(srclayer, &layerinfo->nclasses);

    return MS_SUCCESS;
}

static int BuildFeatureAttributes(layerObj *layer, layerObj* srclayer, shapeObj *shape)
{