Function msDrawBarChartLayer

mapchart.c:465–550

int msDrawBarChartLayer(mapObj *map, layerObj *layer, imageObj *image)
{
    shapeObj    shape;
    int         status=MS_SUCCESS;
    const char *chartSizeProcessingKey=msLayerGetProcessingKey( layer,"CHART_SIZE" );
    const char *barMax=msLayerGetProcessingKey( layer,"CHART_BAR_MAXVAL" );
    const char *barMin=msLayerGetProcessingKey( layer,"CHART_BAR_MINVAL" );
    float width,height;
    float barWidth;
    float *values;
    styleObj **styles;
    pointObj center;
    float barMaxVal,barMinVal;
    int numvalues = layer->numclasses; 
    if(chartSizeProcessingKey==NULL)
    {
        width=height=20;
    }
    else
    {
        switch(sscanf(chartSizeProcessingKey ,"%f %f",&width,&height)) {
            case 2:
                break;
            case 1:
                height = width;
                break;
            default:
                msSetError(MS_MISCERR, "msDrawChart format error for processing key \"CHART_SIZE\"", "msDrawBarChartLayer()");
                return MS_FAILURE;
        }
    }

    if(barMax){
        if(sscanf(barMax,"%f",&barMaxVal)!=1) {
            msSetError(MS_MISCERR, "Error reading value for processing key \"CHART_BAR_MAXVAL\"", "msDrawBarChartLayer()");
            return MS_FAILURE;
        }
    }
    if(barMin) {
        if(sscanf(barMin,"%f",&barMinVal)!=1) {
            msSetError(MS_MISCERR, "Error reading value for processing key \"CHART_BAR_MINVAL\"", "msDrawBarChartLayer()");
            return MS_FAILURE;
        }
    }
    if(barMin && barMax && barMinVal>=barMaxVal) {
        msSetError(MS_MISCERR, "\"CHART_BAR_MINVAL\" must be less than \"CHART_BAR_MAXVAL\"", "msDrawBarChartLayer()");
        return MS_FAILURE;
    }
    barWidth=(float)width/(float)layer->numclasses;
    if(!barWidth)
    {
        msSetError(MS_MISCERR, "Specified width of chart too small to fit given number of classes", "msDrawBarChartLayer()");
        return MS_FAILURE;
    }

    msInitShape(&shape);

    values=(float*)calloc(numvalues,sizeof(float));