1 // HUD_label.cxx -- HUD Label
3 // Written by Michele America, started September 1997.
5 // Copyright (C) 1997 Michele F. America [micheleamerica#geocities:com]
6 // Copyright (C) 2006 Melchior FRANZ [mfranz#aon:at]
8 // This program is free software; you can redistribute it and/or
9 // modify it under the terms of the GNU General Public License as
10 // published by the Free Software Foundation; either version 2 of the
11 // License, or (at your option) any later version.
13 // This program is distributed in the hope that it will be useful, but
14 // WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 // General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
26 #include <simgear/props/condition.hxx>
30 HUD::Label::Label(HUD *hud, const SGPropertyNode *n, float x, float y) :
32 _input(n->getNode("input", false)),
33 _box(n->getBoolValue("box", false)),
34 _pointer_width(n->getFloatValue("pointer-width", 7.0)),
35 _pointer_length(n->getFloatValue("pointer-length", 5.0)),
37 _blink_interval(n->getFloatValue("blinking/interval", -1.0f)),
41 const SGPropertyNode *node = n->getNode("blinking/condition");
43 _blink_condition = sgReadCondition(globals->get_props(), node);
45 const char *halign = n->getStringValue("halign", "center");
46 if (!strcmp(halign, "left"))
48 else if (!strcmp(halign, "right"))
55 const char *pre = n->getStringValue("prefix", 0);
56 const char *post = n->getStringValue("postfix", 0);
57 const char *fmt = n->getStringValue("format", 0);
70 _mode = check_format(_format.c_str());
71 if (_mode == INVALID) {
72 SG_LOG(SG_INPUT, SG_ALERT, "HUD: invalid format '" << _format.c_str()
73 << "' in <label> '" << _name << '\'');
82 void HUD::Label::draw(void)
84 if (!(_mode == NONE || _input.isValid() && blink()))
89 float pw = _pointer_width / 2.0;
93 bool draw_parallel = fabsf(_pointer_width - _w) > 2.0; // draw lines left and right of arrow?
95 if (option_bottom()) {
97 draw_line(_x, _y, l, _y);
98 draw_line(r, _y, _x + _w, _y);
100 p = _y - _pointer_length;
101 draw_line(l, _y, _center_x, p);
102 draw_line(_center_x, p, r, _y);
104 draw_line(_x, _y, _x + _w, _y);
108 draw_line(_x, _y + _h, l, _y + _h);
109 draw_line(r, _y + _h, _x + _w, _y + _h);
111 p = _y + _h + _pointer_length;
112 draw_line(l, _y + _h, _center_x, p);
113 draw_line(_center_x, p, r, _y + _h);
115 draw_line(_x + _w, _y + _h, _x, _y + _h);
119 draw_parallel = fabsf(_pointer_width - _h) > 2.0;
123 draw_line(_x, _y, _x, l);
124 draw_line(_x, r, _x, _y + _h);
126 p = _x - _pointer_length;
127 draw_line(_x, l, p, _center_y);
128 draw_line(p, _center_y, _x, r);
130 draw_line(_x, _y + _h, _x, _y);
132 if (option_right()) {
134 draw_line(_x + _w, _y, _x + _w, l);
135 draw_line(_x + _w, r, _x + _w, _y + _h);
137 p = _x + _w + _pointer_length;
138 draw_line(_x + _w, l, p, _center_y);
139 draw_line(p, _center_y, _x + _w, r);
141 draw_line(_x + _w, _y, _x + _w, _y + _h);
144 const int BUFSIZE = 256;
146 buf[ BUFSIZE] = '\0'; // Be sure to terminate properly
148 snprintf(buf, BUFSIZE, _format.c_str());
149 else if (_mode == STRING)
150 snprintf(buf, BUFSIZE, _format.c_str(), _input.getStringValue());
151 else if (_mode == INT)
152 snprintf(buf, BUFSIZE, _format.c_str(), int(_input.getFloatValue()));
153 else if (_mode == LONG)
154 snprintf(buf, BUFSIZE, _format.c_str(), long(_input.getFloatValue()));
155 else if (_mode == FLOAT)
156 snprintf(buf, BUFSIZE, _format.c_str(), float(_input.getFloatValue()));
157 else if (_mode == DOUBLE) // not really supported yet
158 snprintf(buf, BUFSIZE, _format.c_str(), double(_input.getFloatValue()));
160 if (_halign & HCENTER)
161 draw_text(_center_x, _center_y, buf, _halign, get_digits());
162 else if (_halign & LEFT)
163 draw_text(_x, _center_y, buf, _halign, get_digits());
164 else // if (_halign & RIGHT)
165 draw_text(_x + _w, _center_y, buf, _halign, get_digits());
169 bool HUD::Label::blink()
171 if (_blink_interval < 0.0f)
174 if (_blink_condition && !_blink_condition->test())
177 if (_hud->timer() < _blink_target)
180 _blink_target = _hud->timer() + _blink_interval;
181 return _blink_state = !_blink_state;