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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: Rendering utility functions
* Author: Thomas Bonfort and the MapServer team.
*
******************************************************************************
* Copyright (c) 1996-2011 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"
#include "renderers/agg/include/agg_arc.h"
#include "renderers/agg/include/agg_basics.h"
shapeObj *msRasterizeArc(double x0, double y0, double radius, double startAngle, double endAngle, int isSlice)
{
static int allocated_size=100;
shapeObj *shape = (shapeObj*)calloc(1,sizeof(shapeObj));
MS_CHECK_ALLOC(shape, sizeof(shapeObj), NULL);
mapserver::arc arc ( x0, y0,radius,radius, startAngle*MS_DEG_TO_RAD, endAngle*MS_DEG_TO_RAD,true );
arc.approximation_scale ( 1 );
arc.rewind(1);
msInitShape(shape);
lineObj *line = (lineObj*)calloc(1,sizeof(lineObj));
if (!line) {
msSetError(MS_MEMERR, "%s: %d: Out of memory allocating %u bytes.\n", "msRasterizeArc()" ,
__FILE__, __LINE__, (unsigned int)sizeof(lineObj));
free(shape);
return NULL;
}
shape->line = line;
shape->numlines = 1;
line->point = (pointObj*)calloc(allocated_size,sizeof(pointObj));
if (!line->point) {
msSetError(MS_MEMERR, "%s: %d: Out of memory allocating %u bytes.\n", "msRasterizeArc()" ,
__FILE__, __LINE__, (unsigned int)(allocated_size*sizeof(pointObj)));
free(line);
free(shape);
return NULL;
}
line->numpoints = 0;
double x,y;
//first segment from center to first point of arc
if(isSlice) {
line->point[0].x = x0;
line->point[0].y = y0;
line->numpoints = 1;
}
while(arc.vertex(&x,&y) != mapserver::path_cmd_stop) {
if(line->numpoints == allocated_size) {
allocated_size *= 2;
line->point = (pointObj*)realloc(line->point, allocated_size * sizeof(pointObj));
if (!line->point) {
msSetError(MS_MEMERR, "%s: %d: Out of memory allocating %u bytes.\n", "msRasterizeArc()" ,
__FILE__, __LINE__, (unsigned int)(allocated_size * sizeof(pointObj)));
free(line);
free(shape);
return NULL;
}
}
line->point[line->numpoints].x = x;
line->point[line->numpoints].y = y;
line->numpoints++;
}
//make sure the shape is closed
if(line->point[line->numpoints-1].x != line->point[0].x ||
line->point[line->numpoints-1].y != line->point[0].y) {
if(line->numpoints == allocated_size) {
allocated_size *= 2;
line->point = (pointObj*)msSmallRealloc(line->point, allocated_size * sizeof(pointObj));
}
line->point[line->numpoints].x = line->point[0].x;
line->point[line->numpoints].y = line->point[0].y;
line->numpoints++;
}
return shape;
}
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