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
|
/* This file is part of the GNU plotutils package. Copyright (C) 1995,
1996, 1997, 1998, 1999, 2000, 2005, 2008, Free Software Foundation, Inc.
The GNU plotutils package is free software. You may redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software foundation; either version 2, or (at your
option) any later version.
The GNU plotutils package 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
General Public License for more details.
You should have received a copy of the GNU General Public License along
with the GNU plotutils package; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin St., Fifth Floor,
Boston, MA 02110-1301, USA. */
/* This internal method is invoked by an XDrawablePlotter (or XPlotter)
before drawing any polyline. It sets the relevant attributes in our X11
graphics contexts (the one used for drawing, and the one used for
filling) to what they should be. This includes line type, cap type,
join type, line width, and fill rule.
The GC's are elements of the X11-specific part of any libplot drawing
state. The X11-specific part also includes `non-opaque' representations
of the attributes, which can be easily queried. They are updated too.
Any invoker should pass an argument to this method, indicating which of
the two graphics contexts (the one used for drawing, and the one used
for filling) should be updated. The only attribute we set in the latter
is the fill rule; all the other attributes listed above are set in the
former. */
#include "sys-defines.h"
#include "extern.h"
/* The length of each dash must fit in an unsigned char (X11 convention) */
#define MAX_DASH_LENGTH 255
/* ARGS: x_gc_type specifies which of our X GC's to modify */
void
_pl_x_set_attributes (R___(Plotter *_plotter) int x_gc_type)
{
int i;
if (_plotter->x_drawable1 == (Drawable)NULL
&& _plotter->x_drawable2 == (Drawable)NULL)
/* no drawables, so GC's must not have been created (see
x_savestate.c); do nothing */
return;
if (x_gc_type == X_GC_FOR_DRAWING)
/* update attributes in GC used for drawing */
{
XGCValues gcv;
bool have_dash_list = false;
unsigned char *dash_list = (unsigned char *)NULL;
int dash_list_len = 0, dash_offset = 0;
if (_plotter->drawstate->dash_array_in_effect)
/* have user-specified dash array */
{
dash_list_len = _plotter->drawstate->dash_array_len;
if (dash_list_len > 0)
{
bool odd_length;
double min_sing_val, max_sing_val;
int i, dash_cycle_length;
/* compute minimum singular value of user->device coordinate
map, which we use as a multiplicative factor to convert line
widths (cf. g_linewidth.c), dash lengths, etc. */
_matrix_sing_vals (_plotter->drawstate->transform.m,
&min_sing_val, &max_sing_val);
odd_length = (dash_list_len & 1 ? true : false);
dash_list = (unsigned char *)_pl_xmalloc ((odd_length ? 2 : 1) * dash_list_len * sizeof(unsigned char));
have_dash_list = true; /* will free.. */
dash_cycle_length = 0;
for (i = 0; i < dash_list_len; i++)
{
double unrounded_dashlen;
int dashlen;
unrounded_dashlen =
min_sing_val * _plotter->drawstate->dash_array[i];
dashlen = IROUND(unrounded_dashlen);
dashlen = IMAX(dashlen, 1);
dashlen = IMIN(dashlen, MAX_DASH_LENGTH);
/* convert dash length, int -> unsigned char */
dash_list[i] = (unsigned int)dashlen;
dash_cycle_length += dashlen;
if (odd_length)
{
dash_list[dash_list_len + i] = (unsigned int)dashlen;
dash_cycle_length += dashlen;
}
}
if (odd_length)
dash_list_len *= 2;
dash_offset = IROUND(min_sing_val * _plotter->drawstate->dash_offset);
if (dash_cycle_length > 0)
/* choose an offset in range 0..dash_cycle_length-1 */
{
while (dash_offset < 0)
dash_offset += dash_cycle_length;
dash_offset %= dash_cycle_length;
}
gcv.line_style = LineOnOffDash;
}
else /* no dashes, will draw as solid line */
gcv.line_style = LineSolid;
}
else
/* have one of the canonical line types */
{
if (_plotter->drawstate->line_type != PL_L_SOLID)
{
const int *dash_array;
int i, scale;
dash_list_len = _pl_g_line_styles[_plotter->drawstate->line_type].dash_array_len;
dash_array = _pl_g_line_styles[_plotter->drawstate->line_type].dash_array;
/* scale by line width in terms of pixels, if nonzero */
scale = _plotter->drawstate->quantized_device_line_width;
if (scale <= 0)
scale = 1;
dash_list = (unsigned char *)_pl_xmalloc (PL_MAX_DASH_ARRAY_LEN * sizeof(unsigned char));
have_dash_list = true; /* will free.. */
for (i = 0; i < dash_list_len; i++)
{
int dashlen;
dashlen = scale * dash_array[i];
dashlen = IMAX(dashlen, 1);
dashlen = IMIN(dashlen, MAX_DASH_LENGTH);
dash_list[i] = (unsigned int)dashlen; /* int->unsigned char*/
}
/* use a non-solid line style */
gcv.line_style = LineOnOffDash;
dash_offset = 0;
}
else /* no dash list */
{
/* use a solid line style */
gcv.line_style = LineSolid;
}
}
/* update dash style attributes (dash offset and dash list) */
if (have_dash_list)
{
bool do_it = false;
if (_plotter->drawstate->x_gc_dash_offset != dash_offset
|| _plotter->drawstate->x_gc_dash_list_len != dash_list_len)
do_it = true;
if (do_it == false)
{
for (i = 0; i < dash_list_len; i++)
{
if ((unsigned char)_plotter->drawstate->x_gc_dash_list[i] != dash_list[i])
{
do_it = true;
break;
}
}
}
if (do_it)
{
/* change the GC used for drawing */
XSetDashes (_plotter->x_dpy, _plotter->drawstate->x_gc_fg,
dash_offset, (char *)dash_list, dash_list_len);
/* update non-opaque information on dash style, by installing
dash_list as our `non-opaque dash list' */
/* free former non-opaque dash list if any */
if (_plotter->drawstate->x_gc_dash_list_len > 0)
free ((char *)_plotter->drawstate->x_gc_dash_list);
_plotter->drawstate->x_gc_dash_list = (char *)dash_list;
_plotter->drawstate->x_gc_dash_list_len = dash_list_len;
_plotter->drawstate->x_gc_dash_offset = dash_offset;
}
else
free (dash_list);
}
/* update line style attribute */
if (_plotter->drawstate->x_gc_line_style != gcv.line_style)
{
/* change the GC used for drawing */
XChangeGC (_plotter->x_dpy, _plotter->drawstate->x_gc_fg,
GCLineStyle, &gcv);
/* update non-opaque line-style element */
_plotter->drawstate->x_gc_line_style = gcv.line_style;
}
/* update cap style attribute */
switch (_plotter->drawstate->cap_type)
{
case PL_CAP_BUTT:
default:
gcv.cap_style = CapButt;
break;
case PL_CAP_ROUND:
gcv.cap_style = CapRound;
break;
case PL_CAP_PROJECT:
gcv.cap_style = CapProjecting;
break;
case PL_CAP_TRIANGULAR: /* not supported by X11 */
gcv.cap_style = CapRound;
break;
}
if (_plotter->drawstate->x_gc_cap_style != gcv.cap_style)
{
/* change the GC used for drawing */
XChangeGC (_plotter->x_dpy, _plotter->drawstate->x_gc_fg,
GCCapStyle, &gcv);
/* update non-opaque cap style element */
_plotter->drawstate->x_gc_cap_style = gcv.cap_style;
}
/* update join style attribute */
switch (_plotter->drawstate->join_type)
{
case PL_JOIN_MITER:
default:
gcv.join_style = JoinMiter;
break;
case PL_JOIN_ROUND:
gcv.join_style = JoinRound;
break;
case PL_JOIN_BEVEL:
gcv.join_style = JoinBevel;
break;
case PL_JOIN_TRIANGULAR: /* not supported by X11 */
gcv.join_style = JoinRound;
break;
}
if (_plotter->drawstate->x_gc_join_style != gcv.join_style)
{
/* change the GC used for drawing */
XChangeGC (_plotter->x_dpy, _plotter->drawstate->x_gc_fg,
GCJoinStyle, &gcv);
/* update non-opaque join style element */
_plotter->drawstate->x_gc_join_style = gcv.join_style;
}
/* update line width attribute */
gcv.line_width = _plotter->drawstate->quantized_device_line_width;
if (_plotter->drawstate->x_gc_line_width != gcv.line_width)
{
/* change the GC used for drawing */
XChangeGC (_plotter->x_dpy, _plotter->drawstate->x_gc_fg,
GCLineWidth, &gcv);
/* update non-opaque line-width element */
_plotter->drawstate->x_gc_line_width = gcv.line_width;
}
}
else if (x_gc_type == X_GC_FOR_FILLING)
/* update attributes in GC used for filling */
{
XGCValues gcv;
/* update fill rule attribute */
switch (_plotter->drawstate->fill_rule_type)
{
case PL_FILL_ODD_WINDING:
default:
gcv.fill_rule = EvenOddRule;
break;
case PL_FILL_NONZERO_WINDING:
gcv.fill_rule = WindingRule;
break;
}
if (_plotter->drawstate->x_gc_fill_rule != gcv.fill_rule)
{
/* change the GC used for filling */
XChangeGC (_plotter->x_dpy, _plotter->drawstate->x_gc_fill,
GCFillRule, &gcv);
/* update non-opaque fill-rule element */
_plotter->drawstate->x_gc_fill_rule = gcv.fill_rule;
}
}
return;
}
|