File: arc.c++

package info (click to toggle)
inventor 2.1.5-10-21
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 36,312 kB
  • sloc: ansic: 33,864; lisp: 7,361; cpp: 3,874; yacc: 369; sh: 359; perl: 234; awk: 141; makefile: 81; csh: 35; sed: 11
file content (358 lines) | stat: -rw-r--r-- 9,462 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */

/*
 * arc.c++ - $Revision: 1.1.1.1 $
 * 	Derrick Burns - 1991
 */


#include "glimports.h"
#include "mystdio.h"
#include "myassert.h"
#include "arc.h"
#include "bin.h"
#include "bezierarc.h"
#include "pwlarc.h"
#include "simplemath.h"

/* local preprocessor definitions */
#define	ZERO		0.000001

const int 	Arc::bezier_tag = (1<<13);
const int 	Arc::arc_tag = (1<<3);
const int 	Arc::tail_tag = (1<<6);

/*--------------------------------------------------------------------------
 * makeSide - attach a pwl arc to an arc and mark it as a border arc
 *--------------------------------------------------------------------------
 */

void
Arc::makeSide( PwlArc *pwl, arc_side side )
{
    assert( pwl );
    assert( pwlArc == 0 );
    assert( pwl->npts > 0 );
    assert( pwl->pts );
    pwlArc = pwl;
    clearbezier();
    setside( side );
}
 

/*--------------------------------------------------------------------------
 * numpts - count number of points on arc loop
 *--------------------------------------------------------------------------
 */

int
Arc::numpts( void )
{
    Arc_ptr jarc = this;
    int npts = 0;
    do {
	npts += jarc->pwlArc->npts;
	jarc = jarc->next;
    } while( jarc != this );
    return npts;
}

/*--------------------------------------------------------------------------
 * markverts - mark each point with id of arc
 *--------------------------------------------------------------------------
 */

void
Arc::markverts( void )
{
    Arc_ptr jarc = this;
	
    do {
	TrimVertex *p = jarc->pwlArc->pts;
	for( int i=0; i<jarc->pwlArc->npts; i++ )
	    p[i].nuid = jarc->nuid;
	jarc = jarc->next;
    } while( jarc != this );
}

/*--------------------------------------------------------------------------
 * getextrema - find axis extrema on arc loop
 *--------------------------------------------------------------------------
 */

void
Arc::getextrema( Arc_ptr extrema[4] )
{
    REAL leftpt, botpt, rightpt, toppt;

    extrema[0] = extrema[1] = extrema[2] = extrema[3] = this;

    leftpt = rightpt = this->tail()[0];
    botpt  = toppt   = this->tail()[1];

    for( Arc_ptr jarc = this->next; jarc != this; jarc = jarc->next ) {
	if ( jarc->tail()[0] <  leftpt || 
	    (jarc->tail()[0] <= leftpt && jarc->rhead()[0]<=leftpt))  {
	    leftpt = jarc->pwlArc->pts->param[0];
	    extrema[1] = jarc;
	}
	if ( jarc->tail()[0] >  rightpt || 
	    (jarc->tail()[0] >= rightpt && jarc->rhead()[0] >= rightpt)) {
	    rightpt = jarc->pwlArc->pts->param[0];
	    extrema[3] = jarc;
	}
	if ( jarc->tail()[1] <  botpt || 
            (jarc->tail()[1] <= botpt && jarc->rhead()[1] <= botpt ))  {
	    botpt = jarc->pwlArc->pts->param[1];
	    extrema[2] = jarc;
	}
	if ( jarc->tail()[1] >  toppt || 
	    (jarc->tail()[1] >= toppt && jarc->rhead()[1] >= toppt))  {
	    toppt = jarc->pwlArc->pts->param[1];
	    extrema[0] = jarc;
	}
    }
}


/*-------------------------------------------------------------------------
 * show - print to the stdout the vertices of a pwl arc
 *-------------------------------------------------------------------------
 */

void
Arc::show()
{
/*#ifndef NDEBUG*/
     printf( "\tPWLARC NP: %d FL: 1\n", pwlArc->npts );
    for( int i = 0; i < pwlArc->npts; i++ ) {
          printf( "\t\tVERTEX %f %f\n", pwlArc->pts[i].param[0],
			pwlArc->pts[i].param[1] );
    }
/*#endif*/
}

/*-------------------------------------------------------------------------
 * print - print out the vertices of all pwl arcs on a loop
 *-------------------------------------------------------------------------
 */

void
Arc::print( void )
{
    Arc_ptr jarc = this;

    if( ! this ) {
#ifndef NDEBUG
	dprintf( "\n\nEMPTY TRIM\n\n" );
#endif
	return;
    }

#ifndef NDEBUG
    dprintf( "BGNTRIM\n" );
#endif
    do {
	jarc->show( );
	jarc = jarc->next;
    } while (jarc != this);
#ifndef NDEBUG
    dprintf("ENDTRIM\n" );
#endif
}

/*-------------------------------------------------------------------------
 * isDisconnected - check if tail of arc and head of prev meet
 *-------------------------------------------------------------------------
 */

int
Arc::isDisconnected( void )
{
    if( pwlArc == 0 ) return 0;
    if( prev->pwlArc == 0 ) return 0;

    REAL *p0 = tail();
    REAL *p1 = prev->rhead();

    if( ((p0[0] - p1[0]) > ZERO) || ((p1[0] - p0[0]) > ZERO) ||
	((p0[1] - p1[1]) > ZERO) || ((p1[1] - p0[1]) > ZERO)  ) {
#ifndef NDEBUG
	dprintf( "x coord = %f %f %f\n", p0[0], p1[0], p0[0] - p1[0] );
	dprintf( "y coord = %f %f %f\n", p0[1], p1[1], p0[1] - p1[1] );
#endif
	return 1;
    } else {
        /* average two points together */
        p0[0] = p1[0] = (p1[0] + p0[0]) * 0.5;
        p0[1] = p1[1] = (p1[1] + p0[1]) * 0.5;
        return 0;
    }
}

/*-------------------------------------------------------------------------
 * neq_vert - assert that two 2D vertices are not equal
 *-------------------------------------------------------------------------
 */

inline static int
neq_vert( REAL	*v1, REAL *v2 )
{
     return ((v1[0] != v2[0]) || (v1[1] != v2[1] )) ? 1 : 0;
}

/*-------------------------------------------------------------------------
 * check - verify consistency of a loop, including
 *		1) if pwl, no two consecutive vertices are identical
 *		2) the circular link pointers are valid
 *		3) the geometric info at the head and tail are consistent
 *-------------------------------------------------------------------------
 */

int
Arc::check( void )
{
    if( this == 0 ) return 1;
    Arc_ptr jarc = this;
    do {
	assert( jarc->pwlArc || jarc->bezierArc );

        if (jarc->prev == 0 || jarc->next == 0) {
#ifndef NDEBUG
	    dprintf( "checkjarc:null next/prev pointer\n");
	    jarc->print( );
#endif
	    return 0;
        }

        if (jarc->next->prev != jarc) {
#ifndef NDEBUG
	    dprintf( "checkjarc: pointer linkage screwed up\n");
	    jarc->print( );
#endif
	    return 0;
        }

        if( jarc->pwlArc ) {
#ifndef NDEBUG
	    assert( jarc->pwlArc->npts > 1 );
	    assert( jarc->pwlArc->npts < 100000 );
/*
	    for( int i=0; i < jarc->pwlArc->npts-1; i++ )
		assert( neq_vert( jarc->pwlArc->pts[i].param, 
			     jarc->pwlArc->pts[i+1].param) );
*/
#endif
	    if( jarc->prev->pwlArc ) {
		if( jarc->tail()[1] != jarc->prev->rhead()[1] ) {
#ifndef NDEBUG
		    dprintf( "checkjarc: geometric linkage screwed up 1\n");
		    jarc->prev->show();
		    jarc->show();
#endif
		    return 0;
		}
		if( jarc->tail()[0] != jarc->prev->rhead()[0] ) {
		    
#ifndef NDEBUG
		    dprintf( "checkjarc: geometric linkage screwed up 2\n");
		    jarc->prev->show();
		    jarc->show();
#endif
		    return 0;
		}
	    }
	    if( jarc->next->pwlArc ) {
		if( jarc->next->tail()[0] != jarc->rhead()[0] ) {
#ifndef NDEBUG
			dprintf( "checkjarc: geometric linkage screwed up 3\n");
			jarc->show();
			jarc->next->show();
#endif
			return 0;
		}
		if( jarc->next->tail()[1] != jarc->rhead()[1] ) {
#ifndef NDEBUG
			dprintf( "checkjarc: geometric linkage screwed up 4\n");
			jarc->show();
			jarc->next->show();
#endif
			return 0;
		}
	    }
	    if( jarc->isbezier() ) {
		assert( jarc->pwlArc->npts == 2 );
    		assert( (jarc->pwlArc->pts[0].param[0] == \
	    		jarc->pwlArc->pts[1].param[0]) ||\
    	    		(jarc->pwlArc->pts[0].param[1] == \
	    		jarc->pwlArc->pts[1].param[1]) );
	    }
	}
        jarc = jarc->next;
    } while (jarc != this);
    return 1;
}


#define TOL 0.00001

inline long tooclose( REAL x, REAL y )
{
    return (absr(x-y) < TOL) ?  1 : 0;
}


/*--------------------------------------------------------------------------
 * append - append a jordan arc to a circularly linked list
 *--------------------------------------------------------------------------
 */

Arc_ptr
Arc::append( Arc_ptr jarc )
{
    if( jarc != 0 ) {
	next = jarc->next;
	prev = jarc;
   	next->prev = prev->next = this;
    } else {
        next = prev = this;
    }
    return this;
}


#undef	ZERO		/* be nice where Inventor #include's c++ files */