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output-dxf.c
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output-dxf.c
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/* output-dxf.c: utility routines for DXF output.
Copyright (C) 1999, 2000, 2001 Dietmar Kovar
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.
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. */
/* mail comments and suggestions to kovar@t-online.de */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* Def: HAVE_CONFIG_H */
#include "types.h"
#include "spline.h"
#include "color.h"
#include "output-dxf.h"
#include "xstd.h"
#include "autotrace.h"
#include <math.h>
#include <time.h>
#include <string.h>
#define SIGN(x) ((x) > 0 ? 1 : (x) < 0 ? -1 : 0)
#define ROUND(x) ((int) ((int) (x) + .5 * SIGN (x)))
/* Output macros. */
/* This should be used for outputting a string S on a line by itself. */
#define OUT_LINE(s) \
fprintf (dxf_file, "%s\n", s)
/* These output their arguments, preceded by the indentation. */
#define OUT1(s, e) \
fprintf (dxf_file, s, e)
#define color_check false
/**************************************************************************************
Definitions for spline to line transformation
**************************************************************************************/
typedef enum { NATURAL, TANGENT, PERIODIC, CYCLIC, ANTICYCLIC
} SPLINE_END_TYPE;
#define MAX_VERTICES 10000
#define RESOLUTION 10000 /* asume no pixels bigger than 1000000.0 */
#define RADIAN 57.295779513082
typedef struct xypnt_t {
int xp, yp;
} xypnt;
typedef struct xypnt_point_t {
xypnt point;
struct xypnt_point_t *next_point;
} xypnt_point_rec;
typedef struct xypnt_head_t {
xypnt_point_rec *first_point, *last_point,
*current_point;
struct xypnt_head_t *next_head;
} xypnt_head_rec;
typedef struct Colors_t {
int red, green, blue;
} Colors;
/* RGB to layer transformation table follows */
#define MAX_COLORS 255
struct Colors_t dxftable[MAX_COLORS] =
{
/* 1 */ {255, 0, 0},
/* 2 */ {255, 255, 0},
/* 3 */ { 0, 255, 0},
/* 4 */ { 0, 255, 255},
/* 5 */ { 0, 0, 255},
/* 6 */ {255, 0, 255},
/* 7 */ {255, 255, 255},
/* 8 */ {255, 255, 255},
/* 9 */ {255, 255, 255},
/* 10 */ {255, 9, 0},
/* 11 */ {255, 128, 128},
/* 12 */ {166, 0, 0},
/* 13 */ {166, 83, 83},
/* 14 */ {128, 0, 0},
/* 15 */ {128, 64, 64},
/* 16 */ { 77, 0, 0},
/* 17 */ { 77, 38, 38},
/* 18 */ { 38, 0, 0},
/* 19 */ { 38, 19, 19},
/* 20 */ {255, 64, 0},
/* 21 */ {255, 160, 128},
/* 22 */ {166, 42, 0},
/* 23 */ {166, 104, 83},
/* 24 */ {128, 32, 0},
/* 25 */ {128, 80, 64},
/* 26 */ { 77, 19, 0},
/* 27 */ { 77, 48, 38},
/* 28 */ { 38, 10, 0},
/* 29 */ { 38, 24, 19},
/* 30 */ {256, 128, 0},
/* 31 */ {256, 192, 0},
/* 32 */ {166, 83, 0},
/* 33 */ {166, 125, 83},
/* 34 */ {128, 64, 0},
/* 35 */ {128, 96, 64},
/* 36 */ { 77, 38, 0},
/* 37 */ { 77, 58, 38},
/* 38 */ { 38, 19, 0},
/* 39 */ { 38, 29, 19},
/* 40 */ {255, 192, 0},
/* 41 */ {255, 224, 128},
/* 42 */ {166, 125, 0},
/* 43 */ {166, 146, 83},
/* 44 */ {128, 96, 0},
/* 45 */ {128, 112, 64},
/* 46 */ { 77, 58, 0},
/* 47 */ { 77, 67, 38},
/* 48 */ { 38, 29, 0},
/* 49 */ { 38, 34, 19},
/* 50 */ {255, 255, 0},
/* 51 */ {255, 255, 128},
/* 52 */ {166, 166, 0},
/* 53 */ {166, 166, 83},
/* 54 */ {128, 128, 0},
/* 55 */ {128, 128, 64},
/* 56 */ { 77, 77, 0},
/* 57 */ { 77, 77, 38},
/* 58 */ { 38, 38, 0},
/* 59 */ { 38, 38, 19},
/* 60 */ {192, 255, 0},
/* 61 */ {224, 255, 128},
/* 62 */ {125, 166, 0},
/* 63 */ {146, 166, 83},
/* 64 */ { 96, 128, 0},
/* 65 */ {112, 128, 64},
/* 66 */ { 58, 77, 0},
/* 67 */ { 67, 77, 38},
/* 68 */ { 29, 38, 0},
/* 69 */ { 34, 38, 19},
/* 70 */ {128, 255, 0},
/* 71 */ {192, 255, 128},
/* 72 */ { 83, 166, 0},
/* 73 */ {125, 166, 83},
/* 74 */ { 64, 128, 0},
/* 75 */ { 96, 128, 64},
/* 76 */ { 38, 77, 0},
/* 77 */ { 58, 77, 38},
/* 78 */ { 19, 38, 0},
/* 79 */ { 29, 38, 19},
/* 80 */ { 64, 255, 0},
/* 81 */ {160, 255, 128},
/* 82 */ { 42, 160, 0},
/* 83 */ {104, 160, 80},
/* 84 */ { 32, 128, 0},
/* 85 */ { 80, 128, 64},
/* 86 */ { 19, 77, 0},
/* 87 */ { 48, 77, 38},
/* 88 */ { 10, 38, 0},
/* 89 */ { 24, 38, 19},
/* 90 */ { 0, 255, 0},
/* 91 */ {128, 255, 128},
/* 92 */ { 0, 166, 0},
/* 93 */ { 83, 166, 83},
/* 94 */ { 0, 128, 0},
/* 95 */ { 64, 128, 64},
/* 96 */ { 0, 77, 0},
/* 97 */ { 38, 77, 38},
/* 98 */ { 0, 38, 0},
/* 99 */ { 19, 38, 19},
/* 100 */ { 0, 255, 64},
/* 101 */ {128, 255, 160},
/* 102 */ { 0, 166, 42},
/* 103 */ { 83, 166, 118},
/* 104 */ { 0, 128, 32},
/* 105 */ { 64, 128, 80},
/* 106 */ { 0, 77, 19},
/* 107 */ { 38, 77, 48},
/* 108 */ { 0, 38, 10},
/* 109 */ { 19, 38, 24},
/* 110 */ { 0, 255, 128},
/* 111 */ {128, 255, 192},
/* 112 */ { 0, 166, 83},
/* 113 */ { 83, 166, 125},
/* 114 */ { 0, 128, 64},
/* 115 */ { 64, 128, 96},
/* 116 */ { 0, 77, 38},
/* 117 */ { 38, 77, 58},
/* 118 */ { 0, 38, 19},
/* 119 */ { 19, 38, 29},
/* 120 */ { 0, 255, 192},
/* 121 */ {128, 255, 224},
/* 122 */ { 0, 166, 125},
/* 123 */ { 83, 166, 146},
/* 124 */ { 0, 128, 96},
/* 125 */ { 64, 128, 112},
/* 125 */ { 0, 77, 58},
/* 127 */ { 38, 77, 67},
/* 128 */ { 0, 38, 29},
/* 129 */ { 19, 38, 34},
/* 130 */ { 0, 255, 255},
/* 131 */ {128, 255, 255},
/* 132 */ { 0, 166, 166},
/* 133 */ { 83, 166, 166},
/* 134 */ { 0, 128, 128},
/* 135 */ { 64, 128, 128},
/* 136 */ { 0, 77, 77},
/* 137 */ { 38, 77, 77},
/* 138 */ { 0, 38, 38},
/* 139 */ { 19, 38, 38},
/* 140 */ { 0, 192, 255},
/* 141 */ {128, 224, 255},
/* 142 */ { 0, 125, 166},
/* 143 */ { 83, 146, 166},
/* 144 */ { 0, 96, 128},
/* 145 */ { 64, 112, 128},
/* 146 */ { 0, 58, 77},
/* 147 */ { 38, 67, 77},
/* 148 */ { 0, 29, 38},
/* 149 */ { 19, 34, 38},
/* 150 */ { 0, 128, 255},
/* 151 */ {128, 192, 255},
/* 152 */ { 0, 83, 166},
/* 153 */ { 83, 125, 166},
/* 154 */ { 0, 64, 128},
/* 155 */ { 64, 96, 128},
/* 156 */ { 0, 38, 77},
/* 157 */ { 38, 58, 77},
/* 158 */ { 0, 19, 38},
/* 159 */ { 19, 29, 38},
/* 160 */ { 0, 64, 255},
/* 161 */ {128, 160, 255},
/* 162 */ { 0, 42, 166},
/* 163 */ { 83, 104, 166},
/* 164 */ { 0, 32, 128},
/* 165 */ { 64, 80, 128},
/* 166 */ { 0, 19, 77},
/* 167 */ { 38, 48, 77},
/* 168 */ { 0, 10, 38},
/* 169 */ { 19, 24, 38},
/* 170 */ { 0, 0, 255},
/* 171 */ {128, 128, 255},
/* 172 */ { 0, 0, 166},
/* 173 */ { 83, 83, 166},
/* 174 */ { 0, 0, 128},
/* 175 */ { 64, 64, 128},
/* 176 */ { 0, 0, 77},
/* 177 */ { 38, 38, 77},
/* 178 */ { 0, 0, 38},
/* 179 */ { 19, 19, 38},
/* 180 */ { 64, 0, 255},
/* 181 */ {160, 128, 255},
/* 182 */ { 42, 0, 166},
/* 183 */ {104, 83, 166},
/* 184 */ { 32, 0, 128},
/* 185 */ { 80, 64, 128},
/* 186 */ { 19, 0, 77},
/* 187 */ { 48, 38, 77},
/* 188 */ { 10, 0, 38},
/* 189 */ { 24, 19, 38},
/* 190 */ {128, 0, 255},
/* 191 */ {192, 128, 255},
/* 192 */ { 83, 0, 166},
/* 193 */ {125, 83, 166},
/* 194 */ { 64, 0, 128},
/* 195 */ { 96, 64, 128},
/* 196 */ { 38, 0, 77},
/* 197 */ { 58, 38, 77},
/* 198 */ { 19, 0, 38},
/* 199 */ { 29, 19, 38},
/* 200 */ {192, 0, 255},
/* 201 */ {224, 128, 255},
/* 202 */ {125, 0, 166},
/* 203 */ {146, 83, 166},
/* 204 */ { 96, 0, 128},
/* 205 */ {112, 64, 128},
/* 206 */ { 58, 0, 77},
/* 207 */ { 67, 38, 77},
/* 208 */ { 29, 0, 38},
/* 209 */ { 34, 19, 38},
/* 210 */ {255, 0, 255},
/* 211 */ {255, 128, 255},
/* 212 */ {166, 0, 166},
/* 213 */ {166, 83, 166},
/* 214 */ {128, 0, 128},
/* 215 */ {128, 64, 128},
/* 216 */ { 77, 0, 77},
/* 217 */ { 77, 38, 77},
/* 218 */ { 38, 0, 38},
/* 219 */ { 38, 19, 38},
/* 220 */ {255, 0, 192},
/* 221 */ {255, 128, 224},
/* 222 */ {166, 0, 125},
/* 223 */ {166, 83, 146},
/* 224 */ {128, 0, 96},
/* 225 */ {128, 64, 112},
/* 226 */ { 77, 0, 58},
/* 227 */ { 77, 38, 67},
/* 228 */ { 38, 0, 29},
/* 229 */ { 38, 19, 34},
/* 230 */ {255, 0, 128},
/* 231 */ {255, 128, 192},
/* 232 */ {166, 0, 83},
/* 233 */ {166, 83, 125},
/* 234 */ {128, 0, 64},
/* 235 */ {128, 64, 96},
/* 236 */ { 77, 0, 38},
/* 237 */ { 77, 38, 58},
/* 238 */ { 38, 0, 19},
/* 239 */ { 38, 19, 29},
/* 240 */ {255, 0, 64},
/* 241 */ {255, 128, 160},
/* 242 */ {166, 0, 42},
/* 243 */ {166, 83, 104},
/* 244 */ {128, 0, 32},
/* 245 */ {128, 64, 80},
/* 246 */ { 77, 0, 19},
/* 247 */ { 77, 38, 48},
/* 248 */ { 38, 0, 10},
/* 249 */ { 38, 19, 24},
/* 250 */ { 84, 84, 84},
/* 251 */ {119, 119, 119},
/* 252 */ {153, 153, 153},
/* 253 */ {187, 187, 187},
/* 254 */ {222, 222, 222},
/* 255 */ {255, 255, 255}
};
/******************************************************************************
* Moves the current_point pointer to the next point in the list.
* If current_point is at last point then it becomes NULL.
* finished is 1 if coord_point has not been set, that is current_point is NULL.
*/
void xypnt_next_pnt (xypnt_head_rec *head_xypnt /* */,
xypnt *coord_point /* */,
char *finished /* */)
{
if (head_xypnt && head_xypnt->current_point)
{
head_xypnt->current_point = head_xypnt->current_point->next_point;
if (head_xypnt->current_point == NULL)
*finished = 1;
else
{
*coord_point = head_xypnt->current_point->point;
*finished = 0;
}
}
else
*finished = 1;
}
/******************************************************************************
* Moves the current_point pointer to the begining of the list
*/
void xypnt_first_pnt (xypnt_head_rec *head_xypnt /* */,
xypnt *coord_point /* */,
char *finished /* */)
{
if (head_xypnt)
{
head_xypnt->current_point = head_xypnt->first_point;
if (head_xypnt->current_point == NULL)
*finished = 1;
else
{
*coord_point = head_xypnt->current_point->point;
*finished = 0;
}
}
else
*finished = 1;
}
/******************************************************************************
* This routine will add the "coord_point" to the end of the xypnt list
* which is specified by the "head_xypnt". Does not change current_point.
*/
void xypnt_add_pnt (xypnt_head_rec *head_xypnt /* */,
xypnt coord_point /* */)
{
xypnt_point_rec *temp_point;
if (!head_xypnt)
return;
temp_point=(struct xypnt_point_t *)calloc(1,sizeof(struct xypnt_point_t));
temp_point->point = coord_point;
temp_point->next_point = NULL;
if (head_xypnt->first_point == NULL)
head_xypnt->first_point = temp_point;
else
head_xypnt->last_point->next_point = temp_point;
head_xypnt->last_point = temp_point;
}
/******************************************************************************
* This routine will dispose a list of points and the head pointer to
* which they are connected to. The pointer is returned as a NIL.
*/
void xypnt_dispose_list (xypnt_head_rec **head_xypnt /* */)
{
xypnt_point_rec *p, *old;
if (head_xypnt && *head_xypnt)
{
if ((*head_xypnt)->last_point && (*head_xypnt)->first_point)
{
p = (*head_xypnt)->first_point;
while (p)
{
old = p;
p = p->next_point;
free(old);
}
}
}
}
/******************************************************************************
* Searches color by closest rgb values (distance of 2 3D points)
* not os specific.
* returns: index of color
*/
int GetIndexByRGBValue(int red /* */,
int green /* */,
int blue /* */)
{
int savdis=1, i;
double psav = 10000000, pnew, px, py, pz;
int nred, ngreen, nblue;
for (i = 0; i < MAX_COLORS; i++)
{
nred = dxftable[i].red;
ngreen = dxftable[i].green;
nblue = dxftable[i].blue;
/* compute shortest distance between rgb colors */
px = red*red - 2*nred*red + nred*nred;
py = green*green - 2*ngreen*green + ngreen*ngreen;
pz = blue*blue - 2*nblue*blue + nblue*nblue;
pnew = sqrt(px+py+pz);
if (pnew < psav)
{
psav = pnew;
savdis = i;
}
}
return(savdis+1);
}
/******************************************************************************
* Moves the current_point pointer to the end of the list
*/
void xypnt_last_pnt (xypnt_head_rec *head_xypnt /* */,
xypnt *coord_point /* */,
char *finished /* */)
{
if (head_xypnt)
{
head_xypnt->current_point = head_xypnt->last_point;
if (head_xypnt->current_point == NULL)
*finished = 1;
else
{
*coord_point = head_xypnt->current_point->point;
*finished = 0;
}
}
else
*finished = 1;
}
/******************************************************************************
* computes the distance between p1 and p2
*
* returns:
*/
double distpt2pt(xypnt p1 /* */,
xypnt p2 /* */)
{
double dx, dy;
dx = p2.xp - p1.xp;
dy = p2.yp - p1.yp;
if (p1.xp==p2.xp)
return (fabs (dy));
else if (p1.yp==p2.yp)
return (fabs (dx));
else
return (sqrt(dx*dx + dy*dy));
}
/******************************************************************************
* returns: length of all vectors in vertex list
*/
static double get_total_length(xypnt_head_rec *vtx_list /* */)
{
double total_length;
xypnt curr_pnt, next_pnt;
char end_of_list;
total_length = 0.0;
xypnt_first_pnt(vtx_list, &curr_pnt, &end_of_list);
while (!end_of_list)
{
xypnt_next_pnt(vtx_list, &next_pnt, &end_of_list);
total_length += distpt2pt(curr_pnt, next_pnt);
curr_pnt = next_pnt;
}
return (total_length);
}
/******************************************************************************
* Convert B-Spline to list of lines.
*/
int bspline_to_lines(xypnt_head_rec *vtx_list /* */,
xypnt_head_rec **new_vtx_list /* */,
int vtx_count /* */,
int spline_order /* */,
int spline_resolution /* */)
{
int i, j, knot_index, number_of_segments, knot[MAX_VERTICES + 1],n,m;
double spline_step, total_length, t, spline_pnt_x, spline_pnt_y, r,
*weight;
xypnt curr_pnt, spline_pnt;
char end_of_list;
*new_vtx_list = (struct xypnt_head_t *) calloc(1, sizeof (struct xypnt_head_t));
if (vtx_list)
{
n = vtx_count + spline_order+1;
m = spline_order + 1;
weight = (double *) malloc( n*m* sizeof(double));
for (i = 0; i < vtx_count + spline_order; i++)
knot[i] = (i < spline_order) ? 0 :
(i > vtx_count) ? knot[i-1] : knot[i-1] + 1;
total_length = get_total_length(vtx_list);
r = (spline_resolution==0) ? sqrt(total_length) :
total_length/spline_resolution;
number_of_segments = ROUND(r);
spline_step = ((double)knot[vtx_count+spline_order-1]) /
number_of_segments;
for (knot_index=spline_order-1; knot_index<vtx_count; knot_index++)
{
for (i = 0; i <= vtx_count + spline_order - 2; i++)
weight[i] = (i==knot_index && knot[i]!=knot[i+1]);
t = knot[knot_index];
while (t < knot[knot_index+1] - spline_step / 2.0)
{
spline_pnt_x = 0.0;
spline_pnt_y = 0.0;
for (j = 2; j <= spline_order; j++)
{
i = 0;
xypnt_first_pnt(vtx_list, &curr_pnt, &end_of_list);
while (!end_of_list)
{
weight[(j-1)*n + i] = 0;
if (weight[(j-2)*n+i])
weight[(j-1)*n+i] += (t-knot[i]) * weight[(j-2)*n+i] /
(knot[i+j-1] - knot[i]);
if (weight[(j-2)*n + i+1])
weight[(j-1)*n+i] += (knot[i+j]-t)*weight[(j-2)*n+i+1]/
(knot[i+j] - knot[i+1]);
if (j == spline_order)
{
spline_pnt_x += curr_pnt.xp * weight[(j-1)*n+i];
spline_pnt_y += curr_pnt.yp * weight[(j-1)*n+i];
}
i++;
xypnt_next_pnt(vtx_list, &curr_pnt, &end_of_list);
}
weight[(j-1)*n+i] = 0;
}
spline_pnt.xp = ROUND(spline_pnt_x);
spline_pnt.yp = ROUND(spline_pnt_y);
xypnt_add_pnt(*new_vtx_list, spline_pnt);
t += spline_step;
}
}
xypnt_last_pnt(vtx_list, &spline_pnt, &end_of_list);
xypnt_add_pnt(*new_vtx_list, spline_pnt);
free(weight);
}
return(0);
}
/******************************************************************************
* This function outputs the DXF code which produces the polylines
*/
static void out_splines (FILE * dxf_file, spline_list_array_type shape)
{
unsigned this_list;
double startx, starty;
xypnt_head_rec *vec, *res;
xypnt pnt, pnt1, pnt_old = {0,0};
char fin, new_layer=0, layerstr[10];
int i, first_seg = 1, idx;
strcpy(layerstr, "C1");
for (this_list = 0; this_list < SPLINE_LIST_ARRAY_LENGTH (shape);
this_list++)
{
unsigned this_spline;
color_type last_color = {0,0,0};
spline_list_type list = SPLINE_LIST_ARRAY_ELT (shape, this_list);
spline_type first = SPLINE_LIST_ELT (list, 0);
color_type curr_color = curr_color = (list.clockwise && shape.background_color != NULL)? *(shape.background_color) : list.color;
if (this_list == 0 || !COLOR_EQUAL(curr_color, last_color))
{
if (!(curr_color.r==0 && curr_color.g==0 && curr_color.b==0) || !color_check)
{
idx = GetIndexByRGBValue(curr_color.r, curr_color.g, curr_color.b);
sprintf(layerstr, "C%d", idx);
new_layer = 1;
last_color = curr_color;
}
}
startx = START_POINT (first).x;
starty = START_POINT (first).y;
if (!first_seg)
{
if (ROUND(startx*RESOLUTION) != pnt_old.xp || ROUND(starty*RESOLUTION) != pnt_old.yp || new_layer)
{
/* must begin new polyline */
new_layer = 0;
fprintf(dxf_file, " 0\nSEQEND\n 8\n%s\n", layerstr);
fprintf(dxf_file, " 0\nPOLYLINE\n 8\n%s\n 66\n1\n 10\n%f\n 20\n%f\n",
layerstr, startx, starty);
fprintf(dxf_file, " 0\nVERTEX\n 8\n%s\n 10\n%f\n 20\n%f\n",
layerstr, startx, starty);
pnt_old.xp = ROUND(startx*RESOLUTION);
pnt_old.yp = ROUND(starty*RESOLUTION);
}
}
else
{
fprintf(dxf_file, " 0\nPOLYLINE\n 8\n%s\n 66\n1\n 10\n%f\n 20\n%f\n",
layerstr, startx, starty);
fprintf(dxf_file, " 0\nVERTEX\n 8\n%s\n 10\n%f\n 20\n%f\n",
layerstr, startx, starty);
pnt_old.xp = ROUND(startx*RESOLUTION);
pnt_old.yp = ROUND(starty*RESOLUTION);
}
for (this_spline = 0; this_spline < SPLINE_LIST_LENGTH (list);
this_spline++)
{
spline_type s = SPLINE_LIST_ELT (list, this_spline);
if (SPLINE_DEGREE (s) == LINEARTYPE)
{
if (ROUND(startx*RESOLUTION) != pnt_old.xp || ROUND(starty*RESOLUTION) != pnt_old.yp || new_layer)
{
/* must begin new polyline */
new_layer = 0;
fprintf(dxf_file, " 0\nSEQEND\n 8\n%s\n", layerstr);
fprintf(dxf_file, " 0\nPOLYLINE\n 8\n%s\n 66\n1\n 10\n%f\n 20\n%f\n",
layerstr, startx, starty);
fprintf(dxf_file, " 0\nVERTEX\n 8\n%s\n 10\n%f\n 20\n%f\n",
layerstr, startx, starty);
}
fprintf(dxf_file, " 0\nVERTEX\n 8\n%s\n 10\n%f\n 20\n%f\n",
layerstr, END_POINT(s).x, END_POINT (s).y);
startx = END_POINT(s).x;
starty = END_POINT(s).y;
pnt_old.xp = ROUND(startx*RESOLUTION);
pnt_old.yp = ROUND(starty*RESOLUTION);
}
else
{
vec = (struct xypnt_head_t *)calloc(1, sizeof (struct xypnt_head_t));
pnt.xp = ROUND(startx*RESOLUTION); pnt.yp = ROUND(starty*RESOLUTION);
xypnt_add_pnt(vec, pnt);
pnt.xp = ROUND(CONTROL1(s).x*RESOLUTION); pnt.yp = ROUND(CONTROL1 (s).y*RESOLUTION);
xypnt_add_pnt(vec, pnt);
pnt.xp = ROUND(CONTROL2(s).x*RESOLUTION); pnt.yp = ROUND(CONTROL2 (s).y*RESOLUTION);
xypnt_add_pnt(vec, pnt);
pnt.xp = ROUND(END_POINT(s).x*RESOLUTION); pnt.yp = ROUND(END_POINT (s).y*RESOLUTION);
xypnt_add_pnt(vec, pnt);
res = NULL;
/* Note that spline order can be max. 4 since we have only 4 spline control points */
bspline_to_lines(vec, &res, 4, 4, 10000);
xypnt_first_pnt(res, &pnt, &fin);
if (pnt.xp != pnt_old.xp || pnt.yp != pnt_old.yp || new_layer)
{
/* must begin new polyline */
new_layer = 0;
fprintf(dxf_file, " 0\nSEQEND\n 8\n%s\n", layerstr);
fprintf(dxf_file, " 0\nPOLYLINE\n 8\n%s\n 66\n1\n 10\n%f\n 20\n%f\n",
layerstr, (double)pnt.xp/RESOLUTION, (double)pnt.yp/RESOLUTION);
fprintf(dxf_file, " 0\nVERTEX\n 8\n%s\n 10\n%f\n 20\n%f\n",
layerstr, (double)pnt.xp/RESOLUTION, (double)pnt.yp/RESOLUTION);
}
i = 0;
while (!fin)
{
if (i)
{
fprintf(dxf_file, " 0\nVERTEX\n 8\n%s\n 10\n%f\n 20\n%f\n",
layerstr, (double)pnt.xp/RESOLUTION, (double)pnt.yp/RESOLUTION);
}
pnt1 = pnt;
xypnt_next_pnt(res, &pnt, &fin);
i++;
}
pnt_old = pnt;
xypnt_dispose_list(&vec);
xypnt_dispose_list(&res);
startx = END_POINT(s).x;
starty = END_POINT(s).y;
free(res);
free(vec);
}
}
first_seg = 0;
last_color = curr_color;
}
fprintf(dxf_file, " 0\nSEQEND\n 8\n0\n");
}
/******************************************************************************
* This function outputs a complete layer table for all 255 colors.
*/
void output_layer(FILE *dxf_file,
spline_list_array_type shape)
{
int i, idx;
char layerlist[256];
unsigned this_list;
color_type last_color = {0,0,0};
memset(layerlist, 0, sizeof(layerlist));
for (this_list = 0; this_list < SPLINE_LIST_ARRAY_LENGTH (shape);
this_list++)
{
spline_list_type list = SPLINE_LIST_ARRAY_ELT (shape, this_list);
color_type curr_color = (list.clockwise && shape.background_color != NULL) ? *(shape.background_color) : list.color;
if (this_list == 0 || !COLOR_EQUAL(curr_color, last_color))
{
if (!(curr_color.r==0 && curr_color.g==0 && curr_color.b==0) || !color_check)
{
idx = GetIndexByRGBValue(curr_color.r, curr_color.g, curr_color.b);
layerlist[idx-1] = 1;
last_color = curr_color;
}
}
}
OUT_LINE(" 0");
OUT_LINE("SECTION");
OUT_LINE(" 2");
OUT_LINE("TABLES");
OUT_LINE(" 0");
OUT_LINE("TABLE");
OUT_LINE(" 2");
OUT_LINE("LAYER");
OUT_LINE(" 70");
OUT_LINE(" 2048");
OUT_LINE(" 0");
OUT_LINE("LAYER");
OUT_LINE(" 2");
OUT_LINE("0");
OUT_LINE(" 70");
OUT_LINE(" 0");
OUT_LINE(" 62");
OUT_LINE(" 7");
OUT_LINE(" 6");
OUT_LINE("CONTINUOUS");
for (i=1; i<256; i++)
{
if (layerlist[i-1])
{
OUT_LINE(" 0");
OUT_LINE("LAYER");
OUT_LINE(" 2");
OUT1 ("C%d\n", i);
OUT_LINE(" 70");
OUT_LINE(" 64");
OUT_LINE(" 62");
OUT1 ("%d\n", i);
OUT_LINE(" 6");
OUT_LINE("CONTINUOUS");
}
}
OUT_LINE(" 0");
OUT_LINE("ENDTAB");
OUT_LINE (" 0");
OUT_LINE ("ENDSEC");
}
/******************************************************************************
* DXF output function.
*/
int output_dxf12_writer(FILE* dxf_file, at_string name,
int llx, int lly, int urx, int ury,
at_output_opts_type * opts,
spline_list_array_type shape,
at_msg_func msg_func,
at_address msg_data)
{
OUT_LINE (" 0");
OUT_LINE ("SECTION");
OUT_LINE (" 2");
OUT_LINE ("HEADER");
OUT_LINE (" 9");
OUT_LINE ("$ACADVER");
OUT_LINE (" 1");
OUT_LINE ("AC1009");
OUT_LINE (" 9");
OUT_LINE ("$EXTMIN");
OUT_LINE (" 10");
OUT1 (" %f\n", (double)llx);
OUT_LINE (" 20");
OUT1 (" %f\n", (double)lly);
OUT_LINE (" 30");
OUT_LINE (" 0.000000");
OUT_LINE (" 9");
OUT_LINE ("$EXTMAX");
OUT_LINE (" 10");
OUT1 (" %f\n", (double)urx);
OUT_LINE (" 20");
OUT1 (" %f\n", (double)ury);
OUT_LINE (" 30");
OUT_LINE (" 0.000000");
OUT_LINE (" 0");
OUT_LINE ("ENDSEC");
output_layer(dxf_file, shape);
OUT_LINE (" 0");
OUT_LINE ("SECTION");
OUT_LINE (" 2");
OUT_LINE ("ENTITIES");
out_splines(dxf_file, shape);
OUT_LINE (" 0");
OUT_LINE ("ENDSEC");
OUT_LINE (" 0");
OUT_LINE ("EOF");
return 0;
}