15489bda1b
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6716 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
187 lines
7.0 KiB
C++
187 lines
7.0 KiB
C++
//
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// "$Id$"
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//
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// Line style code for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2009 by Bill Spitzak and others.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// USA.
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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/**
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\file fl_line_style.cxx
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\brief Line style drawing utility hiding different platforms.
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*/
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#include <FL/Fl.H>
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#include <FL/fl_draw.H>
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#include <FL/x.H>
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#include "flstring.h"
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#include <stdio.h>
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#ifdef __APPLE_QUARTZ__
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float fl_quartz_line_width_ = 1.0f;
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static enum CGLineCap fl_quartz_line_cap_ = kCGLineCapButt;
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static enum CGLineJoin fl_quartz_line_join_ = kCGLineJoinMiter;
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static float *fl_quartz_line_pattern = 0;
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static int fl_quartz_line_pattern_size = 0;
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void fl_quartz_restore_line_style_() {
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CGContextSetLineWidth(fl_gc, fl_quartz_line_width_);
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CGContextSetLineCap(fl_gc, fl_quartz_line_cap_);
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CGContextSetLineJoin(fl_gc, fl_quartz_line_join_);
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CGContextSetLineDash(fl_gc, 0, fl_quartz_line_pattern, fl_quartz_line_pattern_size);
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}
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#endif
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/**
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Sets how to draw lines (the "pen").
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If you change this it is your responsibility to set it back to the default
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using \c fl_line_style(0).
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\param[in] style A bitmask which is a bitwise-OR of a line style, a cap
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style, and a join style. If you don't specify a dash type you
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will get a solid line. If you don't specify a cap or join type
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you will get a system-defined default of whatever value is
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fastest.
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\param[in] width The thickness of the lines in pixels. Zero results in the
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system defined default, which on both X and Windows is somewhat
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different and nicer than 1.
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\param[in] dashes A pointer to an array of dash lengths, measured in pixels.
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The first location is how long to draw a solid portion, the next
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is how long to draw the gap, then the solid, etc. It is terminated
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with a zero-length entry. A \c NULL pointer or a zero-length
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array results in a solid line. Odd array sizes are not supported
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and result in undefined behavior.
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\note Because of how line styles are implemented on Win32 systems,
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you \e must set the line style \e after setting the drawing
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color. If you set the color after the line style you will lose
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the line style settings.
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\note The \p dashes array does not work under Windows 95, 98 or Me,
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since those operating systems do not support complex line styles.
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*/
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void fl_line_style(int style, int width, char* dashes) {
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#if defined(USE_X11)
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int ndashes = dashes ? strlen(dashes) : 0;
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// emulate the WIN32 dash patterns on X
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char buf[7];
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if (!ndashes && (style&0xff)) {
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int w = width ? width : 1;
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char dash, dot, gap;
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// adjust lengths to account for cap:
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if (style & 0x200) {
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dash = char(2*w);
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dot = 1; // unfortunately 0 does not work
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gap = char(2*w-1);
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} else {
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dash = char(3*w);
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dot = gap = char(w);
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}
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char* p = dashes = buf;
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switch (style & 0xff) {
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case FL_DASH: *p++ = dash; *p++ = gap; break;
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case FL_DOT: *p++ = dot; *p++ = gap; break;
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case FL_DASHDOT: *p++ = dash; *p++ = gap; *p++ = dot; *p++ = gap; break;
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case FL_DASHDOTDOT: *p++ = dash; *p++ = gap; *p++ = dot; *p++ = gap; *p++ = dot; *p++ = gap; break;
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}
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ndashes = p-buf;
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}
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static int Cap[4] = {CapButt, CapButt, CapRound, CapProjecting};
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static int Join[4] = {JoinMiter, JoinMiter, JoinRound, JoinBevel};
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XSetLineAttributes(fl_display, fl_gc, width,
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ndashes ? LineOnOffDash : LineSolid,
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Cap[(style>>8)&3], Join[(style>>12)&3]);
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if (ndashes) XSetDashes(fl_display, fl_gc, 0, dashes, ndashes);
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#elif defined(WIN32)
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// According to Bill, the "default" cap and join should be the
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// "fastest" mode supported for the platform. I don't know why
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// they should be different (same graphics cards, etc., right?) MRS
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static DWORD Cap[4]= {PS_ENDCAP_FLAT, PS_ENDCAP_FLAT, PS_ENDCAP_ROUND, PS_ENDCAP_SQUARE};
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static DWORD Join[4]={PS_JOIN_ROUND, PS_JOIN_MITER, PS_JOIN_ROUND, PS_JOIN_BEVEL};
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int s1 = PS_GEOMETRIC | Cap[(style>>8)&3] | Join[(style>>12)&3];
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DWORD a[16]; int n = 0;
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if (dashes && dashes[0]) {
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s1 |= PS_USERSTYLE;
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for (n = 0; n < 16 && *dashes; n++) a[n] = *dashes++;
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} else {
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s1 |= style & 0xff; // allow them to pass any low 8 bits for style
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}
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if ((style || n) && !width) width = 1; // fix cards that do nothing for 0?
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LOGBRUSH penbrush = {BS_SOLID,fl_RGB(),0}; // can this be fl_brush()?
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HPEN newpen = ExtCreatePen(s1, width, &penbrush, n, n ? a : 0);
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if (!newpen) {
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Fl::error("fl_line_style(): Could not create GDI pen object.");
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return;
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}
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HPEN oldpen = (HPEN)SelectObject(fl_gc, newpen);
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DeleteObject(oldpen);
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DeleteObject(fl_current_xmap->pen);
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fl_current_xmap->pen = newpen;
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#elif defined(__APPLE_QUARTZ__)
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static enum CGLineCap Cap[4] = { kCGLineCapButt, kCGLineCapButt,
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kCGLineCapRound, kCGLineCapSquare };
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static enum CGLineJoin Join[4] = { kCGLineJoinMiter, kCGLineJoinMiter,
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kCGLineJoinRound, kCGLineJoinBevel };
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if (width<1) width = 1;
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fl_quartz_line_width_ = (float)width;
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fl_quartz_line_cap_ = Cap[(style>>8)&3];
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fl_quartz_line_join_ = Join[(style>>12)&3];
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char *d = dashes;
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static float pattern[16];
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if (d && *d) {
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float *p = pattern;
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while (*d) { *p++ = (float)*d++; }
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fl_quartz_line_pattern = pattern;
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fl_quartz_line_pattern_size = d-dashes;
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} else if (style & 0xff) {
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char dash, dot, gap;
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// adjust lengths to account for cap:
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if (style & 0x200) {
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dash = char(2*width);
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dot = 1;
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gap = char(2*width-1);
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} else {
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dash = char(3*width);
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dot = gap = char(width);
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}
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float *p = pattern;
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switch (style & 0xff) {
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case FL_DASH: *p++ = dash; *p++ = gap; break;
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case FL_DOT: *p++ = dot; *p++ = gap; break;
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case FL_DASHDOT: *p++ = dash; *p++ = gap; *p++ = dot; *p++ = gap; break;
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case FL_DASHDOTDOT: *p++ = dash; *p++ = gap; *p++ = dot; *p++ = gap; *p++ = dot; *p++ = gap; break;
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}
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fl_quartz_line_pattern_size = p-pattern;
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fl_quartz_line_pattern = pattern;
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} else {
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fl_quartz_line_pattern = 0; fl_quartz_line_pattern_size = 0;
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}
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fl_quartz_restore_line_style_();
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#else
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# error unsupported platform
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#endif
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}
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//
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// End of "$Id$".
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//
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