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mapchart.c
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mapchart.c
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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: Implementation of dynamic charting (MS-RFC-29)
* Author: Thomas Bonfort ( thomas.bonfort[at]gmail.com )
*
******************************************************************************
* Copyright (c) 1996-2007 Regents of the University of Minnesota.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies of this Software or works derived from this Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#include "mapserver.h"
#define MS_CHART_TYPE_PIE 1
#define MS_CHART_TYPE_BAR 2
#define MS_CHART_TYPE_VBAR 3
/*
** check if an object of width w and height h placed at point x,y can fit in an image of width mw and height mh
*/
#define MS_CHART_FITS(x,y,w,h,mw,mh) (((x)-(w)/2.>0.)&&((x)+(w)/2.<(mw))&&((y)-(h)/2.>0.)&&((y)+(h)/2.)<(mh))
/*
** find a point on a shape. check if it fits in image
** returns
** MS_SUCCESS and point coordinates in 'p' if chart fits in image
** MS_FAILURE if no point could be found
*/
int findChartPoint(mapObj *map, shapeObj *shape, int width, int height, pointObj *center)
{
int middle,numpoints,idx,offset;
double invcellsize = 1.0/map->cellsize; /*speed up MAP2IMAGE_X/Y_IC_DBL*/
switch(shape->type) {
case MS_SHAPE_POINT:
center->x=MS_MAP2IMAGE_X_IC_DBL(shape->line[0].point[0].x, map->extent.minx, invcellsize);
center->y=MS_MAP2IMAGE_Y_IC_DBL(shape->line[0].point[0].y, map->extent.maxy, invcellsize);
if(MS_CHART_FITS(center->x,center->y,width,height,map->width,map->height))
return MS_SUCCESS;
else
return MS_FAILURE;
break;
case MS_SHAPE_LINE:
/*loop through line segments starting from middle (alternate between before and after middle point)
**first segment that fits is chosen
*/
middle=shape->line[0].numpoints/2; /*start with middle segment of line*/
numpoints=shape->line[0].numpoints;
for(offset=1; offset<=middle; offset++) {
idx=middle+offset;
if(idx<numpoints) {
center->x=(shape->line[0].point[idx-1].x+shape->line[0].point[idx].x)/2.;
center->y=(shape->line[0].point[idx-1].y+shape->line[0].point[idx].y)/2.;
center->x=MS_MAP2IMAGE_X_IC_DBL(center->x, map->extent.minx, invcellsize);
center->y=MS_MAP2IMAGE_Y_IC_DBL(center->y, map->extent.maxy, invcellsize);
if(MS_CHART_FITS(center->x,center->y,width,height,map->width,map->height))
return MS_SUCCESS;
break;
}
idx=middle-offset;
if(idx>=0) {
center->x=(shape->line[0].point[idx].x+shape->line[0].point[idx+1].x)/2;
center->y=(shape->line[0].point[idx].y+shape->line[0].point[idx+1].y)/2;
center->x=MS_MAP2IMAGE_X_IC_DBL(center->x, map->extent.minx, invcellsize);
center->y=MS_MAP2IMAGE_Y_IC_DBL(center->y, map->extent.maxy, invcellsize);
if(MS_CHART_FITS(center->x,center->y,width,height,map->width,map->height))
return MS_SUCCESS;
break;
}
}
return MS_FAILURE;
break;
case MS_SHAPE_POLYGON:
msPolygonLabelPoint(shape, center, -1);
center->x=MS_MAP2IMAGE_X_IC_DBL(center->x, map->extent.minx, invcellsize);
center->y=MS_MAP2IMAGE_Y_IC_DBL(center->y, map->extent.maxy, invcellsize);
if(MS_CHART_FITS(center->x,center->y,width,height,map->width,map->height))
return MS_SUCCESS;
else
return MS_FAILURE;
break;
default:
return MS_FAILURE;
}
}
int WARN_UNUSED drawRectangle(mapObj *map, imageObj *image, double mx, double my, double Mx, double My,
styleObj *style)
{
shapeObj shape;
lineObj line;
pointObj point[5];
line.point = point;
line.numpoints = 5;
shape.line = &line;
shape.numlines = 1;
point[0].x = point[4].x = point[3].x = mx;
point[0].y = point[4].y = point[1].y = my;
point[1].x = point[2].x = Mx;
point[2].y = point[3].y = My;
return msDrawShadeSymbol(map,image,&shape,style,1.0);
}
int WARN_UNUSED msDrawVBarChart(mapObj *map, imageObj *image, pointObj *center,
double *values, styleObj **styles, int numvalues,
double barWidth)
{
int c;
double left,bottom,cur; /*shortcut to pixel boundaries of the chart*/
double height = 0;
for(c=0; c<numvalues; c++) {
height += values[c];
}
cur = bottom = center->y+height/2.;
left = center->x-barWidth/2.;
for(c=0; c<numvalues; c++) {
if(UNLIKELY(MS_FAILURE == drawRectangle(map, image, left, cur, left+barWidth, cur-values[c], styles[c])))
return MS_FAILURE;
cur -= values[c];
}
return MS_SUCCESS;
}
int msDrawBarChart(mapObj *map, imageObj *image, pointObj *center,
double *values, styleObj **styles, int numvalues,
double width, double height, double *maxVal, double *minVal, double barWidth)
{
double upperLimit,lowerLimit;
double shapeMaxVal,shapeMinVal,pixperval;
int c;
double vertOrigin,vertOriginClipped,horizStart,y;
double left,top,bottom; /*shortcut to pixel boundaries of the chart*/
top=center->y-height/2.;
bottom=center->y+height/2.;
left=center->x-width/2.;
shapeMaxVal=shapeMinVal=values[0];
for(c=1; c<numvalues; c++) {
if(maxVal==NULL || minVal==NULL) { /*compute bounds if not specified*/
if(values[c]>shapeMaxVal)
shapeMaxVal=values[c];
if(values[c]<shapeMinVal)
shapeMinVal=values[c];
}
}
/*
* use specified bounds if wanted
* if not, always show the origin
*/
upperLimit = (maxVal!=NULL)? *maxVal : MS_MAX(shapeMaxVal,0);
lowerLimit = (minVal!=NULL)? *minVal : MS_MIN(shapeMinVal,0);
if(upperLimit==lowerLimit) {
/* treat the case where we would have an unspecified behavior */
upperLimit+=0.5;
lowerLimit-=0.5;
}
pixperval=height/(upperLimit-lowerLimit);
vertOrigin=bottom+lowerLimit*pixperval;
vertOriginClipped=(vertOrigin<top) ? top :
(vertOrigin>bottom) ? bottom : vertOrigin;
horizStart=left;
for(c=0; c<numvalues; c++) {
double barHeight=values[c]*pixperval;
/*clip bars*/
y=((vertOrigin-barHeight)<top) ? top :
(vertOrigin-barHeight>bottom) ? bottom : vertOrigin-barHeight;
if(y!=vertOriginClipped) { /*don't draw bars of height == 0 (i.e. either values==0, or clipped)*/
if(values[c]>0) {
if(UNLIKELY(MS_FAILURE == drawRectangle(map, image, horizStart, y, horizStart+barWidth-1, vertOriginClipped, styles[c])))
return MS_FAILURE;
}
else {
if(UNLIKELY(MS_FAILURE == drawRectangle(map,image, horizStart, vertOriginClipped, horizStart+barWidth-1 , y, styles[c])))
return MS_FAILURE;
}
}
horizStart+=barWidth;
}
return MS_SUCCESS;
}
int WARN_UNUSED msDrawPieChart(mapObj *map, imageObj *image,
pointObj *center, double diameter,
double *values, styleObj **styles, int numvalues)
{
int i;
double dTotal=0.,start=0;
for(i=0; i<numvalues; i++) {
if(values[i]<0.) {
msSetError(MS_MISCERR, "cannot draw pie charts for negative values", "msDrawPieChart()");
return MS_FAILURE;
}
dTotal+=values[i];
}
for(i=0; i < numvalues; i++) {
double angle = values[i];
if(angle==0) continue; /*no need to draw. causes artifacts with outlines*/
angle*=360.0/dTotal;
if(UNLIKELY(MS_FAILURE == msDrawPieSlice(map ,image, center, styles[i], diameter/2., start, start+angle)))
return MS_FAILURE;
start+=angle;
}
return MS_SUCCESS;
}
int getNextShape(mapObj *map, layerObj *layer, double *values, int *nvalues, styleObj **styles, shapeObj *shape)
{
int status;
int c;
status = msLayerNextShape(layer, shape);
if(status == MS_SUCCESS) {
#ifdef USE_PROJ
if(layer->project && msProjectionsDiffer(&(layer->projection), &(map->projection)))
msProjectShape(&layer->projection, &map->projection, shape);
else
layer->project = MS_FALSE;
#endif
if(msBindLayerToShape(layer, shape, MS_DRAWMODE_FEATURES|MS_DRAWMODE_LABELS) != MS_SUCCESS)
return MS_FAILURE; /* error message is set in msBindLayerToShape() */
*nvalues = 0;
for(c=0; c<layer->numclasses; c++) {
if(msEvalExpression(layer, shape, &(layer->class[c]->expression), layer->classitemindex) == MS_TRUE) {
values[*nvalues]=(layer->class[c]->styles[0]->size);
styles[*nvalues]=layer->class[c]->styles[0];
(*nvalues)++;
}
}
}
return status;
}
/* eventually add a class to the layer to get the diameter from an attribute */
int pieLayerProcessDynamicDiameter(layerObj *layer)
{
const char *chartRangeProcessingKey=NULL;
char *attrib;
double 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 %lf %lf %lf %lf",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;
}
/* clean up the class added temporarily */
static void pieLayerCleanupDynamicDiameter(layerObj *layer)
{
if( layer->numclasses > 0 && EQUALN(layer->class[layer->numclasses - 1]->name, "__MS_SIZE_ATTRIBUTE_", 20) ) {
classObj *c=msRemoveClass(layer, layer->numclasses - 1);
freeClass(c);
msFree(c);
}
}
int msDrawPieChartLayer(mapObj *map, layerObj *layer, imageObj *image)
{
shapeObj shape;
int status=MS_SUCCESS;
const char *chartRangeProcessingKey=NULL;
const char *chartSizeProcessingKey=msLayerGetProcessingKey( layer,"CHART_SIZE" );
double diameter, mindiameter=-1, maxdiameter, minvalue, maxvalue, exponent=0;
double *values;
styleObj **styles;
pointObj center;
int numvalues = layer->numclasses; /* the number of classes to represent in the graph */
int numvalues_for_shape = 0;
if(chartSizeProcessingKey==NULL) {
chartRangeProcessingKey=msLayerGetProcessingKey( layer,"CHART_SIZE_RANGE" );
if(chartRangeProcessingKey==NULL)
diameter=20;
else {
sscanf(chartRangeProcessingKey,"%*s %lf %lf %lf %lf %lf",
&mindiameter,&maxdiameter,&minvalue,&maxvalue,&exponent);
}
} else {
if(sscanf(chartSizeProcessingKey ,"%lf",&diameter)!=1) {
msSetError(MS_MISCERR, "msDrawChart format error for processing key \"CHART_SIZE\"", "msDrawPieChartLayer()");
return MS_FAILURE;
}
}
/* step through the target shapes */
msInitShape(&shape);
values=(double*)calloc(numvalues,sizeof(double));
MS_CHECK_ALLOC(values, numvalues*sizeof(double), MS_FAILURE);
styles = (styleObj**)malloc((numvalues)*sizeof(styleObj*));
if (styles == NULL) {
msSetError(MS_MEMERR, "%s: %d: Out of memory allocating %u bytes.\n", "msDrawPieChartLayer()",
__FILE__, __LINE__, (unsigned int)(numvalues*sizeof(styleObj*)));
free(values);
return MS_FAILURE;
}
while(MS_SUCCESS == getNextShape(map,layer,values,&numvalues_for_shape,styles,&shape)) {
if(chartRangeProcessingKey!=NULL)
numvalues_for_shape--;
if(numvalues_for_shape == 0) {
msFreeShape(&shape);
continue;
}
msDrawStartShape(map, layer, image, &shape);
if(chartRangeProcessingKey!=NULL) {
diameter = values[numvalues_for_shape];
if(mindiameter>=0) {
if(diameter<=minvalue)
diameter=mindiameter;
else if(diameter>=maxvalue)
diameter=maxdiameter;
else {
if (exponent <= 0)
diameter=MS_NINT(
mindiameter+
((diameter-minvalue)/(maxvalue-minvalue))*
(maxdiameter-mindiameter)
);
else
diameter=MS_NINT(
mindiameter+
pow((diameter-minvalue)/(maxvalue-minvalue),1.0/exponent)*
(maxdiameter-mindiameter)
);
}
}
}
if(findChartPoint(map, &shape, diameter, diameter, ¢er) == MS_SUCCESS) {
status = msDrawPieChart(map,image, ¢er, diameter,
values,styles,numvalues_for_shape);
}
msDrawEndShape(map,layer,image,&shape);
msFreeShape(&shape);
}
free(values);
free(styles);
return status;
}
int msDrawVBarChartLayer(mapObj *map, layerObj *layer, imageObj *image)
{
shapeObj shape;
int status=MS_SUCCESS;
const char *chartSizeProcessingKey=msLayerGetProcessingKey( layer,"CHART_SIZE" );
const char *chartScaleProcessingKey=msLayerGetProcessingKey( layer,"CHART_SCALE" );
double barWidth,scale=1.0;
double *values;
styleObj **styles;
pointObj center;
int numvalues = layer->numclasses;
int numvalues_for_shape;
if(chartSizeProcessingKey==NULL) {
barWidth=20;
} else {
if(sscanf(chartSizeProcessingKey ,"%lf",&barWidth) != 1) {
msSetError(MS_MISCERR, "msDrawChart format error for processing key \"CHART_SIZE\"", "msDrawVBarChartLayer()");
return MS_FAILURE;
}
}
if(chartScaleProcessingKey) {
if(sscanf(chartScaleProcessingKey,"%lf",&scale)!=1) {
msSetError(MS_MISCERR, "Error reading value for processing key \"CHART_SCALE\"", "msDrawVBarChartLayer()");
return MS_FAILURE;
}
}
msInitShape(&shape);
values=(double*)calloc(numvalues,sizeof(double));
MS_CHECK_ALLOC(values, numvalues*sizeof(double), MS_FAILURE);
styles = (styleObj**)malloc(numvalues*sizeof(styleObj*));
if (styles == NULL) {
msSetError(MS_MEMERR, "%s: %d: Out of memory allocating %u bytes.\n", "msDrawVBarChartLayer()",
__FILE__, __LINE__, (unsigned int)(numvalues*sizeof(styleObj*)));
free(values);
return MS_FAILURE;
}
while(MS_SUCCESS == getNextShape(map,layer,values,&numvalues_for_shape,styles,&shape)) {
int i;
double h=0;
if(numvalues_for_shape == 0) {
continue;
}
for(i=0; i<numvalues_for_shape; i++) {
values[i]*=scale;
h += values[i];
}
msDrawStartShape(map, layer, image, &shape);
if(findChartPoint(map, &shape, barWidth,h, ¢er)==MS_SUCCESS) {
status = msDrawVBarChart(map,image,
¢er,
values, styles, numvalues_for_shape,
barWidth);
}
msDrawEndShape(map,layer,image,&shape);
msFreeShape(&shape);
}
free(values);
free(styles);
return status;
}
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" );
double width,height;
double barWidth;
double *values;
styleObj **styles;
pointObj center;
double barMaxVal,barMinVal;
int numvalues = layer->numclasses;
int numvalues_for_shape;
if(chartSizeProcessingKey==NULL) {
width=height=20;
} else {
switch(sscanf(chartSizeProcessingKey ,"%lf %lf",&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,"%lf",&barMaxVal)!=1) {
msSetError(MS_MISCERR, "Error reading value for processing key \"CHART_BAR_MAXVAL\"", "msDrawBarChartLayer()");
return MS_FAILURE;
}
}
if(barMin) {
if(sscanf(barMin,"%lf",&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=(double)width/(double)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=(double*)calloc(numvalues,sizeof(double));
MS_CHECK_ALLOC(values, numvalues*sizeof(double), MS_FAILURE);
styles = (styleObj**)malloc(numvalues*sizeof(styleObj*));
if (styles == NULL) {
msSetError(MS_MEMERR, "%s: %d: Out of memory allocating %u bytes.\n", "msDrawBarChartLayer()",
__FILE__, __LINE__, (unsigned int)(numvalues*sizeof(styleObj*)));
free(values);
return MS_FAILURE;
}
while(MS_SUCCESS == getNextShape(map,layer,values,&numvalues_for_shape,styles,&shape)) {
if(numvalues_for_shape == 0 ) continue;
msDrawStartShape(map, layer, image, &shape);
if(findChartPoint(map, &shape, width,height, ¢er)==MS_SUCCESS) {
status = msDrawBarChart(map,image,
¢er,
values, styles, numvalues_for_shape,
width,height,
(barMax!=NULL)?&barMaxVal:NULL,
(barMin!=NULL)?&barMinVal:NULL,
barWidth);
}
msDrawEndShape(map,layer,image,&shape);
msFreeShape(&shape);
}
free(values);
free(styles);
return status;
}
/**
* Generic function to render chart layers.
*/
int msDrawChartLayer(mapObj *map, layerObj *layer, imageObj *image)
{
rectObj searchrect;
const char *chartTypeProcessingKey=msLayerGetProcessingKey( layer,"CHART_TYPE" );
int chartType=MS_CHART_TYPE_PIE;
int status = MS_FAILURE;
if (image && map && layer) {
if( !(MS_RENDERER_PLUGIN(image->format) )) {
msSetError(MS_MISCERR, "chart drawing currently only supports GD and AGG renderers", "msDrawChartLayer()");
return MS_FAILURE;
}
if(chartTypeProcessingKey!=NULL) {
if( strcasecmp(chartTypeProcessingKey,"PIE") == 0 ) {
chartType=MS_CHART_TYPE_PIE;
} else if( strcasecmp(chartTypeProcessingKey,"BAR") == 0 ) {
chartType=MS_CHART_TYPE_BAR;
} else if( strcasecmp(chartTypeProcessingKey,"VBAR") == 0 ) {
chartType=MS_CHART_TYPE_VBAR;
} else {
msSetError(MS_MISCERR,"unknown chart type for processing key \"CHART_TYPE\", must be one of \"PIE\" or \"BAR\"", "msDrawChartLayer()");
return MS_FAILURE;
}
}
if(chartType == MS_CHART_TYPE_PIE) {
pieLayerProcessDynamicDiameter(layer);
}
/* open this layer */
status = msLayerOpen(layer);
if(status != MS_SUCCESS) return MS_FAILURE;
status = msLayerWhichItems(layer, MS_FALSE, NULL);
if(status != MS_SUCCESS) {
msLayerClose(layer);
return MS_FAILURE;
}
/* identify target shapes */
if(layer->transform == MS_TRUE)
searchrect = map->extent;
else {
searchrect.minx = searchrect.miny = 0;
searchrect.maxx = map->width-1;
searchrect.maxy = map->height-1;
}
#ifdef USE_PROJ
if((map->projection.numargs > 0) && (layer->projection.numargs > 0))
msProjectRect(&map->projection, &layer->projection, &searchrect); /* project the searchrect to source coords */
#endif
status = msLayerWhichShapes(layer, searchrect, MS_FALSE);
if(status == MS_DONE) { /* no overlap */
msLayerClose(layer);
if(chartType == MS_CHART_TYPE_PIE)
pieLayerCleanupDynamicDiameter(layer);
return MS_SUCCESS;
} else if(status != MS_SUCCESS) {
msLayerClose(layer);
if(chartType == MS_CHART_TYPE_PIE)
pieLayerCleanupDynamicDiameter(layer);
return MS_FAILURE;
}
switch(chartType) {
case MS_CHART_TYPE_PIE:
status = msDrawPieChartLayer(map, layer, image);
break;
case MS_CHART_TYPE_BAR:
status = msDrawBarChartLayer(map, layer, image);
break;
case MS_CHART_TYPE_VBAR:
status = msDrawVBarChartLayer(map, layer, image);
break;
default:
return MS_FAILURE;/*shouldn't be here anyways*/
}
msLayerClose(layer);
if(chartType == MS_CHART_TYPE_PIE)
pieLayerCleanupDynamicDiameter(layer);
}
return status;
}