Function pieLayerProcessDynamicDiameter

mapchart.c:272–323

eventually add a class to the layer to get the diameter from an attribute */

/* eventually add a class to the layer to get the diameter from an attribute */
int pieLayerProcessDynamicDiameter(layerObj *layer) {
    const char *chartRangeProcessingKey=NULL;
    char *attrib;
    float mindiameter=-1, maxdiameter, minvalue, maxvalue;
    classObj *newclass;
    styleObj *newstyle;
    const char *chartSizeProcessingKey=msLayerGetProcessingKey( layer,"CHART_SIZE" );
    if(chartSizeProcessingKey != NULL)
        return MS_FALSE;
    chartRangeProcessingKey=msLayerGetProcessingKey( layer,"CHART_SIZE_RANGE" );
    if(chartRangeProcessingKey==NULL)
        return MS_FALSE;
    attrib = msSmallMalloc(strlen(chartRangeProcessingKey)+1);
    switch(sscanf(chartRangeProcessingKey,"%s %f %f %f %f",attrib,
                &mindiameter,&maxdiameter,&minvalue,&maxvalue))
    {
        case 1: /*we only have the attribute*/
        case 5: /*we have the attribute and the four range values*/
            break;
        default:
            free(attrib);
            msSetError(MS_MISCERR, "Chart Layer format error for processing key \"CHART_RANGE\"", "msDrawChartLayer()");
            return MS_FAILURE;
    }
    /*create a new class in the layer containing the wanted attribute
     * as the SIZE of its first STYLE*/
    newclass=msGrowLayerClasses(layer);
    if(newclass==NULL) {
        free(attrib);
        return MS_FAILURE;
    }
    initClass(newclass);
    layer->numclasses++;

    /*create and attach a new styleObj to our temp class
     * and bind the wanted attribute to its SIZE
     */
    newstyle=msGrowClassStyles(newclass);
    if(newstyle==NULL) {
        free(attrib);
        return MS_FAILURE;
    }
    initStyle(newstyle);
    newclass->numstyles++;
    newclass->name=(char*)msStrdup("__MS_SIZE_ATTRIBUTE_");
    newstyle->bindings[MS_STYLE_BINDING_SIZE].item=msStrdup(attrib);
    newstyle->numbindings++;
    free(attrib);

    return MS_TRUE;

}


int msDrawPieChartLayer(mapObj *map, layerObj *layer, imageObj *image)