first commit

src/Cockpit/built_in/FGMagRibbon.cxx

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+//  FGMagRibbon.cxx - Built-in layer for the magnetic compass ribbon layer.
+//
+//  Written by David Megginson, started January 2000.
+//
+//  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.
+//
+//  $Id$
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include "FGMagRibbon.hxx"
+
+
+FGMagRibbon::FGMagRibbon (int w, int h)
+  : FGTexturedLayer(w, h)
+{
+  FGCroppedTexture texture("Aircraft/Instruments/Textures/compass-ribbon.rgb");
+  setTexture(texture);
+  _magcompass_node =
+      fgGetNode("/instrumentation/magnetic-compass/indicated-heading-deg",
+                true);
+}
+
+void
+FGMagRibbon::draw (osg::State& state)
+{
+  double heading = _magcompass_node->getDoubleValue();
+  double xoffset, yoffset;
+
+  while (heading >= 360.0) {
+    heading -= 360.0;
+  }
+  while (heading < 0.0) {
+    heading += 360.0;
+  }
+
+  if (heading >= 60.0 && heading <= 180.0) {
+    xoffset = heading / 240.0;
+    yoffset = 0.75;
+  } else if (heading >= 150.0 && heading <= 270.0) {
+    xoffset = (heading - 90.0) / 240.0;
+    yoffset = 0.50;
+  } else if (heading >= 240.0 && heading <= 360.0) {
+    xoffset = (heading - 180.0) / 240.0;
+    yoffset = 0.25;
+  } else {
+    if (heading < 270.0)
+      heading += 360.0;
+    xoffset = (heading - 270.0) / 240.0;
+    yoffset = 0.0;
+  }
+
+  xoffset = 1.0 - xoffset;
+				// Adjust to put the number in the centre
+  xoffset -= 0.25;
+
+  FGCroppedTexture *t = getTexture();
+  t->setCrop(xoffset, yoffset, xoffset + 0.5, yoffset + 0.25);
+
+  static osg::ref_ptr<osg::StateSet> stateSet = new osg::StateSet;
+  stateSet->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
+
+  state.pushStateSet(stateSet.get());
+  state.apply();
+
+  FGTexturedLayer::draw(state);
+
+  state.popStateSet();
+  state.apply();
+}
+
+// end of FGMagRibbon.cxx

src/Cockpit/built_in/FGMagRibbon.hxx

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+//  FGMagRibbon.hxx - Built-in layer for the magnetic compass ribbon layer.
+//
+//  Written by David Megginson, started January 2000.
+//
+//  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.
+//
+//  $Id$
+
+#ifndef __FG_MAG_RIBBON_HXX
+#define __FG_MAG_RIBBON_HXX
+
+#include <Main/fg_props.hxx>
+#include "../panel.hxx"
+
+////////////////////////////////////////////////////////////////////////
+// Built-in layer for the magnetic compass ribbon layer.
+////////////////////////////////////////////////////////////////////////
+
+class FGMagRibbon : public FGTexturedLayer
+{
+public:
+    FGMagRibbon (int w, int h);
+    virtual ~FGMagRibbon () {}
+
+    virtual void draw (osg::State& state);
+
+private:
+    SGPropertyNode_ptr _magcompass_node;
+};
+
+#endif // __FG_MAG_RIBBON_HXX
+
+// end of FGMagRibbon.hxx

src/Cockpit/built_in/README

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+This is special directory for built-in
+layers of various sorts.