fltk/src/fl_line_style.cxx

//
// "$Id: fl_line_style.cxx,v 1.3.2.3.2.5 2001/10/19 17:02:57 easysw Exp $"
//
// Line style code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2001 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library 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.
//
// Please report all bugs and problems to "fltk-bugs@fltk.org".
//

#include <FL/fl_draw.H>
#include <FL/x.H>
#include <string.h>
#include <stdio.h>

void fl_line_style(int style, int width, char* dashes) {
#ifdef WIN32
  // According to Bill, the "default" cap and join should be the
  // "fastest" mode supported for the platform.  I don't know why
  // they should be different (same graphics cards, etc., right?) MRS
  static DWORD Cap[4]= {PS_ENDCAP_FLAT, PS_ENDCAP_FLAT, PS_ENDCAP_ROUND, PS_ENDCAP_SQUARE};
  static DWORD Join[4]={PS_JOIN_ROUND, PS_JOIN_MITER, PS_JOIN_ROUND, PS_JOIN_BEVEL};
  int s1 = PS_GEOMETRIC | Cap[(style>>8)&3] | Join[(style>>12)&3];
  DWORD a[16]; int n = 0;
  if (dashes && dashes[0]) {
    s1 |= PS_USERSTYLE;
    for (n = 0; n < 16 && *dashes; n++) a[n] = *dashes++;
  } else {
    s1 |= style & 0xff; // allow them to pass any low 8 bits for style
  }
  if ((style || n) && !width) width = 1; // fix cards that do nothing for 0?
  LOGBRUSH penbrush = {BS_SOLID,fl_RGB(),0}; // can this be fl_brush()?
  HPEN newpen = ExtCreatePen(s1, width, &penbrush, n, n ? a : 0);
  if (!newpen) {
    // CET - FIXME - remove this debug fprintf()?
    fprintf(stderr, "fl_line_style(): Could not create GDI pen object.\n");
    return;
  }
  HPEN oldpen = (HPEN)SelectObject(fl_gc, newpen);
  DeleteObject(oldpen);
  fl_current_xmap->pen = newpen;
#else
  int ndashes = dashes ? strlen(dashes) : 0;
  // emulate the WIN32 dash patterns on X
  char buf[7];
  if (!ndashes && (style&0xff)) {
    int w = width ? width : 1;
    char dash, dot, gap;
    // adjust lengths to account for cap:
    if (style & 0x200) {
      dash = char(2*w);
      dot = 1; // unfortunately 0 does not work
      gap = char(2*w-1);
    } else {
      dash = char(3*w);
      dot = gap = char(w);
    }
    char* p = dashes = buf;
    switch (style & 0xff) {
    case FL_DASH:	*p++ = dash; *p++ = gap; break;
    case FL_DOT:	*p++ = dot; *p++ = gap; break;
    case FL_DASHDOT:	*p++ = dash; *p++ = gap; *p++ = dot; *p++ = gap; break;
    case FL_DASHDOTDOT: *p++ = dash; *p++ = gap; *p++ = dot; *p++ = gap; *p++ = dot; *p++ = gap; break;
    }
    ndashes = p-buf;
  }
  static int Cap[4] = {CapButt, CapButt, CapRound, CapProjecting};
  static int Join[4] = {JoinMiter, JoinMiter, JoinRound, JoinBevel};
  XSetLineAttributes(fl_display, fl_gc, width, 
		     ndashes ? LineOnOffDash : LineSolid,
		     Cap[(style>>8)&3], Join[(style>>12)&3]);
  if (ndashes) XSetDashes(fl_display, fl_gc, 0, dashes, ndashes);
#endif
}


//
// End of "$Id: fl_line_style.cxx,v 1.3.2.3.2.5 2001/10/19 17:02:57 easysw Exp $".
//