420 lines
14 KiB
C++
420 lines
14 KiB
C++
// hud_rwy.cxx -- An instrument that renders a virtual runway on the HUD
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//
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// Written by Aaron Wilson & Phillip Merritt, Nov 2004.
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//
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// Copyright (C) 2004 Aaron Wilson, Aaron.I.Wilson@nasa.gov
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// Copyright (C) 2004 Phillip Merritt, Phillip.M.Merritt@nasa.gov
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// 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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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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#include <simgear/compiler.h>
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#include "hud.hxx"
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#include <math.h>
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#include <Main/fg_props.hxx>
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#include <Main/globals.hxx>
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#include <Scenery/scenery.hxx>
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#include <Aircraft/aircraft.hxx>
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#include <Environment/environment.hxx>
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#include <Environment/environment_mgr.hxx>
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#include <simgear/math/sg_geodesy.hxx>
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#include <simgear/math/polar3d.hxx>
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#include SG_GLU_H
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#include <ATC/ATCutils.hxx>
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runway_instr::runway_instr(int x,
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int y,
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int width,
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int height,
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float scale_data,
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bool working):instr_item(x,y,width,height,NULL,scale_data,0,working)
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{
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runway = get_active_runway();
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get_rwy_points(points3d);
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stippleOut=0xFFFF;
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stippleCen=0xFFFF;
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arrowScale = 1.0;
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arrowRad = 0.0;
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view[0] = 0;
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view[1] = 0;
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view[2] = 640;
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view[3] = 480;
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center.x = view[2]>>1;
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center.y = view[3]>>1;
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location.left = center.x-(width>>1)+x;
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location.right = center.x+(width>>1)+x;
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location.bottom = center.y-(height>>1)+y;
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location.top = center.y+(height>>1)+y;
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cockpit_view = globals->get_viewmgr()->get_view(0);
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default_heading = fgGetDouble("/sim/view[0]/config/pitch-heading-deg",0.0);
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default_pitch = fgGetDouble("/sim/view[0]/config/pitch-pitch-deg",0.0);
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}
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void runway_instr::draw() {
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if (!is_broken()) {
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glPushAttrib(GL_LINE_STIPPLE | GL_LINE_STIPPLE_PATTERN | GL_LINE_WIDTH);
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float modelView[4][4],projMat[4][4];
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bool anyLines;
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//Get the current view
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FGViewer* curr_view = globals->get_viewmgr()->get_current_view();
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int curr_view_id = globals->get_viewmgr()->get_current();
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double gpo = curr_view->getGoalPitchOffset_deg();
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double gho = curr_view->getGoalHeadingOffset_deg();
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double po = curr_view->getPitchOffset_deg();
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double ho = curr_view->getHeadingOffset_deg();
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double yaw = -(cockpit_view->getHeadingOffset_deg()-default_heading)*SG_DEGREES_TO_RADIANS;
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double pitch = (cockpit_view->getPitchOffset_deg()-default_pitch)*SG_DEGREES_TO_RADIANS;
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//double roll = fgGetDouble("/sim/view[0]/config/roll-offset-deg",0.0) //TODO: adjust for default roll offset
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double sPitch = sin(pitch), cPitch = cos(pitch),
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sYaw = sin(yaw), cYaw = cos(yaw);
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//Assuming that the "Cockpit View" is always at position zero!!!
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if (curr_view_id != 0) {
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globals->get_viewmgr()->set_view(0);
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globals->get_viewmgr()->copyToCurrent();
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}
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//Set the camera to the cockpit view to get the view of the runway from the cockpit
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ssgSetCamera((sgVec4 *)cockpit_view->get_VIEW());
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//Get the currently active runway and the 3d points
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runway = get_active_runway();
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get_rwy_points(points3d);
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//Get the current project matrix
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ssgGetProjectionMatrix(projMat);
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// const sgVec4 *viewMat = globals->get_current_view()->get_VIEW();
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//Get the current model view matrix (cockpit view)
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ssgGetModelviewMatrix(modelView);
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//Create a rotation matrix to correct for any offsets (other than default offsets) to the model view matrix
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sgMat4 xy; //rotation about the Rxy, negate the sin's on Ry
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xy[0][0]=cYaw; xy[1][0]=0.0f; xy[2][0]=-sYaw; xy[3][0]=0.0f;
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xy[0][1]=sPitch*-sYaw; xy[1][1]=cPitch; xy[2][1]=-sPitch*cYaw; xy[3][1]=0.0f;
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xy[0][2]=cPitch*sYaw; xy[1][2]=sPitch; xy[2][2]=cPitch*cYaw; xy[3][2]=0.0f;
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xy[0][3]=0.0f; xy[1][3]=0.0f; xy[2][3]=0.0f; xy[3][3]=1.0f;
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//Re-center the model view
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sgPostMultMat4(modelView,xy);
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//copy float matrices to double
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for (int i=0; i<4; i++) {
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for (int j=0; j<4; j++) {
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int idx = (i*4)+j;
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mm[idx] = (double)modelView[i][j];
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pm[idx] = (double)projMat[i][j];
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}
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}
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//Calculate the 2D points via gluProject
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int result = GL_TRUE;
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for (int i=0; i<6; i++) {
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result = gluProject(points3d[i][0],points3d[i][1],points3d[i][2],mm,pm,view,&points2d[i][0],&points2d[i][1],&points2d[i][2]);
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}
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//set the line width based on our distance from the runway
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setLineWidth();
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//Draw the runway lines on the HUD
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glEnable(GL_LINE_STIPPLE);
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glLineStipple(1,stippleOut);
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anyLines =
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drawLine(points3d[0],points3d[1],points2d[0],points2d[1]) | //draw top
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drawLine(points3d[2],points3d[1],points2d[2],points2d[1]) | //draw right
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drawLine(points3d[2],points3d[3],points2d[2],points2d[3]) | //draw bottom
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drawLine(points3d[3],points3d[0],points2d[3],points2d[0]); //draw left
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glLineStipple(1,stippleCen);
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anyLines |= drawLine(points3d[5],points3d[4],points2d[5],points2d[4]); //draw center
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//Check to see if arrow needs drawn
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if ((!anyLines && drawIA) || drawIAAlways) {
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drawArrow(); //draw indication arrow
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}
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//Restore the current view and any offsets
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if (curr_view_id != 0) {
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globals->get_viewmgr()->set_view(curr_view_id);
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globals->get_viewmgr()->copyToCurrent();
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curr_view->setHeadingOffset_deg(ho);
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curr_view->setPitchOffset_deg(po);
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curr_view->setGoalHeadingOffset_deg(gho);
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curr_view->setGoalPitchOffset_deg(gpo);
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}
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//Set the camera back to the current view
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ssgSetCamera((sgVec4 *)curr_view);
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glPopAttrib();
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}//if not broken
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}
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FGRunway runway_instr::get_active_runway() {
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FGEnvironment stationweather =
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((FGEnvironmentMgr *)globals->get_subsystem("environment"))->getEnvironment();
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double hdg = stationweather.get_wind_from_heading_deg();
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FGRunway runway;
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globals->get_runways()->search( fgGetString("/sim/presets/airport-id"), int(hdg), &runway);
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return runway;
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}
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void runway_instr::get_rwy_points(sgdVec3 *points3d) {
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static Point3D center = globals->get_scenery()->get_center();
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//Get the current tile center
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Point3D currentCenter = globals->get_scenery()->get_center();
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Point3D tileCenter = currentCenter;
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if (center != currentCenter) //if changing tiles
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tileCenter = center; //use last center
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double alt = current_aircraft.fdm_state->get_Runway_altitude()*SG_FEET_TO_METER;
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double length = (runway.length/2.0)*SG_FEET_TO_METER;
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double width = (runway.width/2.0)*SG_FEET_TO_METER;
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double frontLat,frontLon,backLat,backLon,az,tempLat,tempLon;
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geo_direct_wgs_84(alt,runway.lat,runway.lon,runway.heading,length,&backLat,&backLon,&az);
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sgGeodToCart(backLat*SG_DEGREES_TO_RADIANS,backLon*SG_DEGREES_TO_RADIANS,alt,points3d[4]);
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geo_direct_wgs_84(alt,runway.lat,runway.lon,runway.heading+180,length,&frontLat,&frontLon,&az);
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sgGeodToCart(frontLat*SG_DEGREES_TO_RADIANS,frontLon*SG_DEGREES_TO_RADIANS,alt,points3d[5]);
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geo_direct_wgs_84(alt,backLat,backLon,runway.heading+90,width,&tempLat,&tempLon,&az);
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sgGeodToCart(tempLat*SG_DEGREES_TO_RADIANS,tempLon*SG_DEGREES_TO_RADIANS,alt,points3d[0]);
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geo_direct_wgs_84(alt,backLat,backLon,runway.heading-90,width,&tempLat,&tempLon,&az);
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sgGeodToCart(tempLat*SG_DEGREES_TO_RADIANS,tempLon*SG_DEGREES_TO_RADIANS,alt,points3d[1]);
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geo_direct_wgs_84(alt,frontLat,frontLon,runway.heading-90,width,&tempLat,&tempLon,&az);
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sgGeodToCart(tempLat*SG_DEGREES_TO_RADIANS,tempLon*SG_DEGREES_TO_RADIANS,alt,points3d[2]);
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geo_direct_wgs_84(alt,frontLat,frontLon,runway.heading+90,width,&tempLat,&tempLon,&az);
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sgGeodToCart(tempLat*SG_DEGREES_TO_RADIANS,tempLon*SG_DEGREES_TO_RADIANS,alt,points3d[3]);
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for(int i = 0; i < 6; i++)
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{
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points3d[i][0] -= tileCenter.x();
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points3d[i][1] -= tileCenter.y();
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points3d[i][2] -= tileCenter.z();
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}
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center = currentCenter;
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}
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bool runway_instr::drawLine(sgdVec3 a1, sgdVec3 a2, sgdVec3 point1, sgdVec3 point2) {
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sgdVec3 p1, p2;
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sgdCopyVec3(p1, point1);
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sgdCopyVec3(p2, point2);
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bool p1Inside = (p1[0]>=location.left && p1[0]<=location.right && p1[1]>=location.bottom && p1[1]<=location.top);
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bool p1Insight = (p1[2] >= 0.0 && p1[2] < 1.0);
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bool p1Valid = p1Insight && p1Inside;
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bool p2Inside = (p2[0]>=location.left && p2[0]<=location.right && p2[1]>=location.bottom && p2[1]<=location.top);
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bool p2Insight = (p2[2] >= 0.0 && p2[2] < 1.0);
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bool p2Valid = p2Insight && p2Inside;
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if (p1Valid && p2Valid) { //Both project points are valid, draw the line
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glBegin(GL_LINES);
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glVertex2d(p1[0],p1[1]);
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glVertex2d(p2[0],p2[1]);
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glEnd();
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}
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else if (p1Valid) { //p1 is valid and p2 is not, calculate a new valid point
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sgdVec3 vec = {a2[0]-a1[0], a2[1]-a1[1], a2[2]-a1[2]};
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//create the unit vector
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sgdScaleVec3(vec,1.0/sgdLengthVec3(vec));
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sgdVec3 newPt;
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sgdCopyVec3(newPt,a1);
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sgdAddVec3(newPt,vec);
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if (gluProject(newPt[0],newPt[1],newPt[2],mm,pm,view,&p2[0],&p2[1],&p2[2]) && (p2[2]>0&&p2[2]<1.0) ) {
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boundPoint(p1,p2);
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glBegin(GL_LINES);
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glVertex2d(p1[0],p1[1]);
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glVertex2d(p2[0],p2[1]);
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glEnd();
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}
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}
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else if (p2Valid) { //p2 is valid and p1 is not, calculate a new valid point
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sgdVec3 vec = {a1[0]-a2[0], a1[1]-a2[1], a1[2]-a2[2]};
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//create the unit vector
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sgdScaleVec3(vec,1.0/sgdLengthVec3(vec));
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sgdVec3 newPt;
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sgdCopyVec3(newPt,a2);
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sgdAddVec3(newPt,vec);
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if (gluProject(newPt[0],newPt[1],newPt[2],mm,pm,view,&p1[0],&p1[1],&p1[2]) && (p1[2]>0&&p1[2]<1.0)) {
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boundPoint(p2,p1);
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glBegin(GL_LINES);
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glVertex2d(p2[0],p2[1]);
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glVertex2d(p1[0],p1[1]);
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glEnd();
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}
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}
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else if (p1Insight && p2Insight) { //both points are insight, but not inside
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bool v = boundOutsidePoints(p1,p2);
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if (v) {
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glBegin(GL_LINES);
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glVertex2d(p1[0],p1[1]);
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glVertex2d(p2[0],p2[1]);
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glEnd();
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}
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return v;
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}
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//else both points are not insight, don't draw anything
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return (p1Valid && p2Valid);
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}
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void runway_instr::boundPoint(sgdVec3 v, sgdVec3 m) {
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double y = v[1];
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if(m[1] < v[1]) {
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y = location.bottom;
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}
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else if(m[1] > v[1]) {
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y = location.top;
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}
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if (m[0] == v[0]) {
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m[1]=y;
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return; //prevent divide by zero
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}
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double slope = (m[1]-v[1])/(m[0]-v[0]);
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m[0] = (y-v[1])/slope + v[0];
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m[1] = y;
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if (m[0] < location.left) {
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m[0] = location.left;
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m[1] = slope * (location.left-v[0])+v[1];
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}
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else if (m[0] > location.right) {
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m[0] = location.right;
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m[1] = slope * (location.right-v[0])+v[1];
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}
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}
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bool runway_instr::boundOutsidePoints(sgdVec3 v, sgdVec3 m) {
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bool pointsInvalid = (v[1]>location.top && m[1]>location.top) ||
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(v[1]<location.bottom && m[1]<location.bottom) ||
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(v[0]>location.right && m[0]>location.right) ||
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(v[0]<location.left && m[0]<location.left);
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if (pointsInvalid)
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return false;
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if (m[0] == v[0]) {//x's are equal, vertical line
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if (m[1]>v[1]) {
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m[1]=location.top;
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v[1]=location.bottom;
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}
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else {
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v[1]=location.top;
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m[1]=location.bottom;
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}
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return true;
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}
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if (m[1] == v[1]) { //y's are equal, horizontal line
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if (m[0] > v[0]) {
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m[0] = location.right;
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v[0] = location.left;
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}
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else {
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v[0] = location.right;
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m[0] = location.left;
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}
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return true;
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}
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double slope = (m[1]-v[1])/(m[0]-v[0]);
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double b = v[1]-(slope*v[0]);
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double y1 = slope * location.left + b;
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double y2 = slope * location.right + b;
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double x1 = (location.bottom - b) / slope;
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double x2 = (location.top - b) / slope;
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int counter = 0;
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if (y1 >= location.bottom && y1 <= location.top) {
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v[0] = location.left;
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v[1] = y1;
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counter++;
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}
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if (y2 >= location.bottom && y2 <= location.top) {
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if (counter > 0) {
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m[0] = location.right;
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m[1] = y2;
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}
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else {
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v[0] = location.right;
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v[1] = y2;
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}
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counter++;
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}
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if (x1 >= location.left && x1 <= location.right) {
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if (counter > 0) {
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m[0] = x1;
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m[1] = location.bottom;
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}
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else {
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v[0] = x1;
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v[1] = location.bottom;
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}
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counter++;
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}
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if (x2 >= location.left && x2 <= location.right) {
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m[0] = x1;
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m[1] = location.bottom;
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counter++;
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}
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return (counter == 2);
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}
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void runway_instr::drawArrow() {
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Point3D ac,rwy;
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ac.setlat(current_aircraft.fdm_state->get_Latitude_deg());
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ac.setlon(current_aircraft.fdm_state->get_Longitude_deg());
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rwy.setlat(runway.lat);
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rwy.setlon(runway.lon);
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float theta = GetHeadingFromTo(ac,rwy);
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theta -= fgGetDouble("/orientation/heading-deg");
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theta = -theta;
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glTranslated((location.right+location.left)/2.0,(location.top+location.bottom)/2.0,0.0);
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glRotated(theta,0.0,0.0,1.0);
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glTranslated(0.0,arrowRad,0.0);
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glScaled(arrowScale,arrowScale,0.0);
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glBegin(GL_TRIANGLES);
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glVertex2d(-5.0,12.5);
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glVertex2d(0.0,25.0);
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glVertex2d(5.0,12.5);
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glEnd();
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glBegin(GL_QUADS);
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glVertex2d(-2.5,0.0);
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glVertex2d(-2.5,12.5);
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glVertex2d(2.5,12.5);
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glVertex2d(2.5,0.0);
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glEnd();
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glPopMatrix();
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}
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void runway_instr::setLineWidth() {
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//Calculate the distance from the runway, A
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double course, distance;
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calc_gc_course_dist(Point3D(runway.lon*SGD_DEGREES_TO_RADIANS, runway.lat*SGD_DEGREES_TO_RADIANS, 0.0),
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Point3D(current_aircraft.fdm_state->get_Longitude(),current_aircraft.fdm_state->get_Latitude(), 0.0 ),
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&course, &distance);
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distance *= SG_METER_TO_NM;
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//Get altitude above runway, B
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double alt_nm = get_agl();
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static const SGPropertyNode *startup_units_node
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= fgGetNode("/sim/startup/units");
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if (!strcmp(startup_units_node->getStringValue(), "feet"))
|
||
alt_nm *= SG_FEET_TO_METER*SG_METER_TO_NM;
|
||
else
|
||
alt_nm *= SG_METER_TO_NM;
|
||
//Calculate distance away from runway, C = v(A<>+B<>)
|
||
distance = sqrt(alt_nm*alt_nm + distance*distance);
|
||
if (distance < scaleDist)
|
||
glLineWidth( 1.0+( (lnScale-1)*( (scaleDist-distance)/scaleDist)));
|
||
else
|
||
glLineWidth( 1.0 );
|
||
|
||
}
|
||
|
||
void runway_instr::setArrowRotationRadius(double radius) { arrowRad = radius; }
|
||
void runway_instr::setArrowScale(double scale) { arrowScale = scale; }
|
||
void runway_instr::setDrawArrow(bool draw) {drawIA = draw;}
|
||
void runway_instr::setDrawArrowAlways(bool draw) {drawIAAlways = draw;}
|
||
void runway_instr::setLineScale(double scale) {lnScale = scale;}
|
||
void runway_instr::setScaleDist(double dist_m) {scaleDist = dist_m;}
|
||
void runway_instr::setStippleOutline(unsigned short stipple) {stippleOut = stipple;}
|
||
void runway_instr::setStippleCenterline(unsigned short stipple){stippleCen = stipple;}
|
||
|