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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: RFC48 implementation of geometry transformations for styling
* Author: Thomas Bonfort , Camptocamp (thomas.bonfort at camptocamp.com)
*
******************************************************************************
* Copyright (c) 1996-2005 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"
void msStyleSetGeomTransform(styleObj *s, char *transform) {
msFree(s->_geomtransformexpression);
s->_geomtransformexpression = strdup(transform);
if(!strncasecmp("start",transform,5)) {
s->_geomtransform = MS_GEOMTRANSFORM_START;
}
else if(!strncasecmp("end",transform,3)) {
s->_geomtransform = MS_GEOMTRANSFORM_END;
}
else if(!strncasecmp("vertices",transform,8)) {
s->_geomtransform = MS_GEOMTRANSFORM_VERTICES;
}
else if(!strncasecmp("bbox",transform,4)) {
s->_geomtransform = MS_GEOMTRANSFORM_BBOX;
}
else if(!strncasecmp("centroid",transform,8)) {
s->_geomtransform = MS_GEOMTRANSFORM_CENTROID;
}
else {
s->_geomtransform = MS_GEOMTRANSFORM_NONE;
msSetError(MS_MISCERR,"unknown transform expression","msStyleSetGeomTransform()");
msFree(s->_geomtransformexpression);
s->_geomtransformexpression = NULL;
}
}
/*
* return a copy of the geometry transform expression
* returned char* must be freed by the caller
*/
char *msStyleGetGeomTransform(styleObj *s) {
if(s->_geomtransformexpression==NULL)
return NULL;
return strdup(s->_geomtransformexpression);
}
double calcOrientation(pointObj *p1, pointObj *p2) {
double theta;
theta = atan2(p2->x - p1->x,p2->y - p1->y);
return MS_RAD_TO_DEG*(theta-MS_PI2);
}
double calcMidAngle(pointObj *p1, pointObj *p2, pointObj *p3) {
double theta1,theta2;
theta1 = atan2(p1->x-p2->x,p1->y-p2->y);
if(theta1<0) theta1 += MS_2PI;
theta2 = atan2(p3->x-p2->x,p3->y-p2->y);
if(theta2<0) theta2 += MS_2PI;
return MS_RAD_TO_DEG*((theta1+theta2)/2.0);
}
/*
* RFC48 implementation:
* - transform the original shapeobj
* - use the styleObj to render the transformed shapeobj
*/
int msDrawTransformedShape(mapObj *map, symbolSetObj *symbolset, imageObj *image, shapeObj *shape, styleObj *style, double scalefactor){
int type = style->_geomtransform;
int i,j;
switch(type) {
case MS_GEOMTRANSFORM_END: /*render point on last vertex only*/
for(j=0;j<shape->numlines;j++) {
lineObj *line = &(shape->line[j]);
pointObj *p = &(line->point[line->numpoints-1]);
if(p->x<0||p->x>image->width||p->y<0||p->y>image->height)
continue;
if(style->autoangle==MS_TRUE && line->numpoints>1) {
style->angle = calcOrientation(&(line->point[line->numpoints-2]),p);
if(symbolset->symbol[style->symbol]->type==MS_SYMBOL_VECTOR)
style->angle = - style->angle;
}
msDrawMarkerSymbol(symbolset,image,p,style,scalefactor);
}
break;
case MS_GEOMTRANSFORM_START: /*render point on first vertex only*/
for(j=0;j<shape->numlines;j++) {
lineObj *line = &(shape->line[j]);
pointObj *p = &(line->point[0]);
/*skip if outside image*/
if(p->x<0||p->x>image->width||p->y<0||p->y>image->height)
continue;
if(style->autoangle==MS_TRUE && line->numpoints>1) {
style->angle = calcOrientation(p,&(line->point[1]));
if(symbolset->symbol[style->symbol]->type==MS_SYMBOL_VECTOR)
style->angle = - style->angle;
}
msDrawMarkerSymbol(symbolset,image,p,style,scalefactor);
}
break;
case MS_GEOMTRANSFORM_VERTICES:
for(j=0;j<shape->numlines;j++) {
lineObj *line = &(shape->line[j]);
for(i=1;i<line->numpoints-1;i++) {
pointObj *p = &(line->point[i]);
/*skip points outside image*/
if(p->x<0||p->x>image->width||p->y<0||p->y>image->height)
continue;
if(style->autoangle==MS_TRUE) {
style->angle = calcMidAngle(&(line->point[i-1]),&(line->point[i]),&(line->point[i+1]));
if(symbolset->symbol[style->symbol]->type==MS_SYMBOL_VECTOR)
style->angle = - style->angle;
}
msDrawMarkerSymbol(symbolset,image,p,style,scalefactor);
}
}
break;
case MS_GEOMTRANSFORM_BBOX:
{
shapeObj bbox;
lineObj bbox_line;
pointObj bbox_points[5];
int padding = MS_MAX(style->width,style->size)+3; //so clipped shape does not extent into image
/*create a shapeObj representing the bounding box (clipped by the image size)*/
bbox.numlines = 1;
bbox.line = &bbox_line;
bbox.line->numpoints = 5;
bbox.line->point = bbox_points;
msComputeBounds(shape);
bbox_points[0].x=bbox_points[4].x=bbox_points[1].x =
(shape->bounds.minx < -padding) ? -padding : shape->bounds.minx;
bbox_points[2].x=bbox_points[3].x =
(shape->bounds.maxx > image->width+padding) ? image->width+padding : shape->bounds.maxx;
bbox_points[0].y=bbox_points[4].y=bbox_points[3].y =
(shape->bounds.miny < -padding) ? -padding : shape->bounds.miny;
bbox_points[1].y=bbox_points[2].y =
(shape->bounds.maxy > image->height+padding) ? image->height+padding : shape->bounds.maxy;
msDrawShadeSymbol(symbolset, image, &bbox, style, scalefactor);
}
break;
case MS_GEOMTRANSFORM_CENTROID:
{
double unused; /*used by centroid function*/
pointObj centroid;
if(MS_SUCCESS == msGetPolygonCentroid(shape,¢roid,&unused,&unused)){
msDrawMarkerSymbol(symbolset,image,¢roid,style,scalefactor);
}
}
default:
msSetError(MS_MISCERR, "unknown geomtransform", "msDrawTransformedShape()");
return MS_FAILURE;
}
return MS_SUCCESS;
}
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