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//
// "$Id: fl_draw.cxx,v 1.6 1999/01/07 19:17:38 mike Exp $"
//
// Label drawing code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-1999 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@easysw.com".
//
// Implementation of fl_draw(const char*,int,int,int,int,Fl_Align)
// Used to draw all the labels and text, this routine:
// Word wraps the labels to fit into their bounding box.
// Breaks them into lines at the newlines.
// Expands all unprintable characters to ^X or \nnn notation
// Aligns them against the inside of the box.
#include <FL/fl_draw.H>
#include <string.h>
#define MAXBUF 1024
char fl_draw_shortcut; // set by fl_labeltypes.C
static char* underline_at;
// Copy p to buf, replacing unprintable characters with ^X and \nnn
// Stop at a newline of if MAXBUF characters written to buffer.
// Also word-wrap if width exceeds maxw.
// Returns a pointer to the start of the next line of caharcters.
// Sets n to the number of characters put into the buffer.
// Sets width to the width of the string in the current font.
static const char*
expand(const char* from, char* buf, double maxw, int& n, double &width, int wrap) {
char* o = buf;
char* e = buf+(MAXBUF-4);
underline_at = 0;
char* word_end = o;
const char* word_start = from;
double w = 0;
const char* p = from;
for (;; p++) {
int c = *p & 255;
if (!c || c == ' ' || c == '\n') {
// test for word-wrap:
if (word_start < p && wrap) {
double newwidth = w + fl_width(word_end, o-word_end);
if (word_end > buf && newwidth > maxw) { // break before this word
o = word_end;
p = word_start;
break;
}
word_end = o;
w = newwidth;
}
if (!c) break;
else if (c == '\n') {p++; break;}
word_start = p+1;
}
if (o > e) break; // don't overflow buffer
if (c == '\t') {
for (c = (o-buf)%8; c<8 && o<e; c++) *o++ = ' ';
} else if (c == '&' && fl_draw_shortcut && *(p+1)) {
if (*(p+1) == '&') {p++; *o++ = '&';}
else if (fl_draw_shortcut != 2) underline_at = o;
} else if (c < ' ' || c == 127) { // ^X
*o++ = '^';
*o++ = c ^ 0x40;
} else if (c >= 128 && c < 0xA0) { // \nnn
*o++ = '\\';
*o++ = (c>>6)+'0';
*o++ = ((c>>3)&7)+'0';
*o++ = (c&7)+'0';
} else if (c == 0xA0) { // non-breaking space
*o++ = ' ';
} else {
*o++ = c;
}
}
width = w + fl_width(word_end, o-word_end);
*o = 0;
n = o-buf;
return p;
}
void fl_draw(
const char* str, // the (multi-line) string
int x, int y, int w, int h, // bounding box
Fl_Align align,
void (*callthis)(const char*,int,int,int)
) {
const char* p;
const char* e;
char buf[MAXBUF];
int buflen;
// count how many lines and put the last one into the buffer:
int lines;
double width;
for (p=str,lines=0; ;) {
e = expand(p, buf, w, buflen, width, align&FL_ALIGN_WRAP);
lines++;
if (!*e) break;
p = e;
}
// figure out vertical position of the first line:
int ypos;
int height = fl_height();
if (align & FL_ALIGN_BOTTOM) ypos = y+h-(lines-1)*height;
else if (align & FL_ALIGN_TOP) ypos = y+height;
else ypos = y+(h-lines*height)/2+height;
// now draw all the lines:
int desc = fl_descent();
for (p=str; ; ypos += height) {
if (lines>1) e = expand(p, buf, w, buflen, width, align&FL_ALIGN_WRAP);
int xpos;
if (align & FL_ALIGN_LEFT) xpos = x;
else if (align & FL_ALIGN_RIGHT) xpos = x+w-int(width+.5);
else xpos = x+int((w-width)/2);
callthis(buf,buflen,xpos,ypos-desc);
if (underline_at)
callthis("_",1,xpos+int(fl_width(buf,underline_at-buf)),ypos-desc);
if (!*e) break;
p = e;
}
}
void fl_draw(
const char* str, // the (multi-line) string
int x, int y, int w, int h, // bounding box
Fl_Align align) {
if (!str || !*str) return;
if (w && h && !fl_not_clipped(x, y, w, h)) return;
if (align & FL_ALIGN_CLIP) fl_clip(x, y, w, h);
fl_draw(str, x, y, w, h, align, fl_draw);
if (align & FL_ALIGN_CLIP) fl_pop_clip();
}
void fl_measure(const char* str, int& w, int& h) {
h = fl_height();
if (!str || !*str) {w = 0; return;}
const char* p;
const char* e;
char buf[MAXBUF];
int buflen;
int lines;
double width;
int W = 0;
for (p=str,lines=0; ;) {
e = expand(p, buf, w, buflen, width, w!=0);
if (int(width) > W) W = int(width);
lines++;
if (!*e) break;
p = e;
}
w = W;
h = lines*h;
}
//
// End of "$Id: fl_draw.cxx,v 1.6 1999/01/07 19:17:38 mike Exp $".
//
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