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flightgear/src/Instrumentation/HUD/HUD_label.cxx

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// HUD_label.cxx -- HUD Label
//
// Written by Michele America, started September 1997.
//
// Copyright (C) 1997 Michele F. America [micheleamerica#geocities:com]
// Copyright (C) 2006 Melchior FRANZ [mfranz#aon:at]
//
// This program is free software; you can 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 of the
// License, or (at your option) any later version.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
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#include <simgear/props/condition.hxx>
#include "HUD.hxx"
HUD::Label::Label(HUD *hud, const SGPropertyNode *n, float x, float y) :
Item(hud, n, x, y),
_input(n->getNode("input", false)),
_box(n->getBoolValue("box", false)),
_pointer_width(n->getFloatValue("pointer-width", 7.0)),
_pointer_length(n->getFloatValue("pointer-length", 5.0)),
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_blink_condition(0),
_blink_interval(n->getFloatValue("blinking/interval", -1.0f)),
_blink_target(0.0),
_blink_state(true)
{
const SGPropertyNode *node = n->getNode("blinking/condition");
if (node)
_blink_condition = sgReadCondition(globals->get_props(), node);
const char *halign = n->getStringValue("halign", "center");
if (!strcmp(halign, "left"))
_halign = LEFT;
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else if (!strcmp(halign, "right"))
_halign = RIGHT;
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else
_halign = HCENTER;
_halign |= VCENTER;
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const char *pre = n->getStringValue("prefix", 0);
const char *post = n->getStringValue("postfix", 0);
const char *fmt = n->getStringValue("format", 0);
if (pre)
_format = pre;
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if (fmt)
_format += fmt;
else
_format += "%s";
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if (post)
_format += post;
_mode = check_format(_format.c_str());
if (_mode == INVALID) {
SG_LOG(SG_INPUT, SG_ALERT, "HUD: invalid format '" << _format.c_str() << '\'');
_format = "INVALID";
_mode = NONE;
}
blink();
}
void HUD::Label::draw(void)
{
if (!(_mode == NONE || _input.isValid() && blink()))
return;
if (_box) {
float l, r, p;
float pw = _pointer_width / 2.0;
l = _center_x - pw;
r = _center_x + pw;
bool draw_parallel = fabsf(_pointer_width - _w) > 2.0; // draw lines left and right of arrow?
if (option_bottom()) {
if (draw_parallel) {
draw_line(_x, _y, l, _y);
draw_line(r, _y, _x + _w, _y);
}
p = _y - _pointer_length;
draw_line(l, _y, _center_x, p);
draw_line(_center_x, p, r, _y);
} else
draw_line(_x, _y, _x + _w, _y);
if (option_top()) {
if (draw_parallel) {
draw_line(_x, _y + _h, l, _y + _h);
draw_line(r, _y + _h, _x + _w, _y + _h);
}
p = _y + _h + _pointer_length;
draw_line(l, _y + _h, _center_x, p);
draw_line(_center_x, p, r, _y + _h);
} else
draw_line(_x + _w, _y + _h, _x, _y + _h);
l = _center_y - pw;
r = _center_y + pw;
draw_parallel = fabsf(_pointer_width - _h) > 2.0;
if (option_left()) {
if (draw_parallel) {
draw_line(_x, _y, _x, l);
draw_line(_x, r, _x, _y + _h);
}
p = _x - _pointer_length;
draw_line(_x, l, p, _center_y);
draw_line(p, _center_y, _x, r);
} else
draw_line(_x, _y + _h, _x, _y);
if (option_right()) {
if (draw_parallel) {
draw_line(_x + _w, _y, _x + _w, l);
draw_line(_x + _w, r, _x + _w, _y + _h);
}
p = _x + _w + _pointer_length;
draw_line(_x + _w, l, p, _center_y);
draw_line(p, _center_y, _x + _w, r);
} else
draw_line(_x + _w, _y, _x + _w, _y + _h);
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}
const int BUFSIZE = 256;
char buf[BUFSIZE];
if (_mode == NONE)
snprintf(buf, BUFSIZE, _format.c_str());
else if (_mode == STRING)
snprintf(buf, BUFSIZE, _format.c_str(), _input.getStringValue());
else if (_mode == INT)
snprintf(buf, BUFSIZE, _format.c_str(), int(_input.getFloatValue()));
else if (_mode == LONG)
snprintf(buf, BUFSIZE, _format.c_str(), long(_input.getFloatValue()));
else if (_mode == FLOAT)
snprintf(buf, BUFSIZE, _format.c_str(), float(_input.getFloatValue()));
else if (_mode == DOUBLE) // not really supported yet
snprintf(buf, BUFSIZE, _format.c_str(), double(_input.getFloatValue()));
if (_halign & HCENTER)
draw_text(_center_x, _center_y, buf, _halign, get_digits());
else if (_halign & LEFT)
draw_text(_x, _center_y, buf, _halign, get_digits());
else // if (_halign & RIGHT)
draw_text(_x + _w, _center_y, buf, _halign, get_digits());
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}
// make sure the format matches '[ -+#]?\d*(\.\d*)?(l?[df]|s)'
//
HUD::Label::Format HUD::Label::check_format(const char *f) const
{
bool l = false;
Format fmt = STRING;
for (; *f; f++) {
if (*f == '%') {
if (f[1] == '%')
f++;
else
break;
}
}
if (*f++ != '%')
return NONE;
if (*f == ' ' || *f == '+' || *f == '-' || *f == '#')
f++;
while (*f && isdigit(*f))
f++;
if (*f == '.') {
f++;
while (*f && isdigit(*f))
f++;
}
if (*f == 'l')
l = true, f++;
if (*f == 'd')
fmt = l ? LONG : INT;
else if (*f == 'f')
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fmt = l ? DOUBLE : FLOAT;
else if (*f == 's') {
if (l)
return INVALID;
fmt = STRING;
} else
return INVALID;
for (++f; *f; f++) {
if (*f == '%') {
if (f[1] == '%')
f++;
else
return INVALID;
}
}
return fmt;
}
bool HUD::Label::blink()
{
if (_blink_interval < 0.0f)
return true;
if (_blink_condition && !_blink_condition->test())
return true;
if (_hud->timer() < _blink_target)
return _blink_state;
_blink_target = _hud->timer() + _blink_interval;
return _blink_state = !_blink_state;
}