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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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