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//
// Line style code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2024 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
/**
\file Fl_Xlib_Graphics_Driver_line_style.cxx
\brief Line style drawing utility hiding different platforms.
*/
#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include <FL/platform.H>
#include "../../flstring.h"
#include "Fl_Xlib_Graphics_Driver.H"
#include <stdlib.h>
void Fl_Xlib_Graphics_Driver::line_style_unscaled(int style, int width, char* dashes) {
int ndashes = dashes ? strlen(dashes) : 0;
// emulate the Windows dash patterns on X
char buf[7] = {0};
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;
if (*dashes == 0) ndashes = 0; // against error with very small scaling
}
static int Cap[4] = {CapButt, CapButt, CapRound, CapProjecting};
static int Join[4] = {JoinMiter, JoinMiter, JoinRound, JoinBevel};
XSetLineAttributes(fl_display, gc_,
line_width_,
ndashes ? LineOnOffDash : LineSolid,
Cap[(style>>8)&3], Join[(style>>12)&3]);
if (ndashes) XSetDashes(fl_display, gc_, 0, dashes, ndashes);
}
void *Fl_Xlib_Graphics_Driver::change_pen_width(int lwidth) {
XGCValues *gc_values = (XGCValues*)malloc(sizeof(XGCValues));
gc_values->line_width = lwidth;
XChangeGC(fl_display, gc_, GCLineWidth, gc_values);
gc_values->line_width = line_width_;
line_width_ = lwidth;
return gc_values;
}
void Fl_Xlib_Graphics_Driver::reset_pen_width(void *data) {
XGCValues *gc_values = (XGCValues*)data;
line_width_ = gc_values->line_width;
XChangeGC(fl_display, gc_, GCLineWidth, gc_values);
free(data);
}
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