--- /dev/null
+// hud_rwy.cxx -- An instrument that renders a virtual runway on the HUD
+//
+// Written by Aaron Wilson & Phillip Merritt, Nov 2004.
+//
+// Copyright (C) 2004 Aaron Wilson, Aaron.I.Wilson@nasa.gov
+// Copyright (C) 2004 Phillip Merritt, Phillip.M.Merritt@nasa.gov
+//
+// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+#include "hud.hxx"
+
+#include <math.h>
+#include <Main/fg_props.hxx>
+#include <Main/globals.hxx>
+#include <Scenery/scenery.hxx>
+#include <Aircraft/aircraft.hxx>
+#include <Environment/environment.hxx>
+#include <Environment/environment_mgr.hxx>
+#include <simgear/math/sg_geodesy.hxx>
+#include <simgear/math/polar3d.hxx>
+#include <GL/glu.h>
+#include <ATC/ATCutils.hxx>
+
+runway_instr::runway_instr(int x,
+ int y,
+ int width,
+ int height,
+ float scale_data,
+ bool working):instr_item(x,y,width,height,NULL,scale_data,0,working)
+{
+ runway = get_active_runway();
+ get_rwy_points(points3d);
+ stippleOut=0xFFFF;
+ stippleCen=0xFFFF;
+ arrowScale = 1.0;
+ arrowRad = 0.0;
+ view[0] = 0;
+ view[1] = 0;
+ view[2] = 640;
+ view[3] = 480;
+ center.x = view[2]>>1;
+ center.y = view[3]>>1;
+ location.left = center.x-(width>>1)+x;
+ location.right = center.x+(width>>1)+x;
+ location.bottom = center.y-(height>>1)+y;
+ location.top = center.y+(height>>1)+y;
+ cockpit_view = globals->get_viewmgr()->get_view(0);
+ default_heading = fgGetDouble("/sim/view[0]/config/pitch-heading-deg",0.0);
+ default_pitch = fgGetDouble("/sim/view[0]/config/pitch-pitch-deg",0.0);
+}
+
+void runway_instr::draw() {
+ if (!is_broken()) {
+ glPushAttrib(GL_LINE_STIPPLE | GL_LINE_STIPPLE_PATTERN | GL_LINE_WIDTH);
+ float modelView[4][4],projMat[4][4];
+ bool anyLines;
+ //Get the current view
+ FGViewer* curr_view = globals->get_viewmgr()->get_current_view();
+ int curr_view_id = globals->get_viewmgr()->get_current();
+ double gpo = curr_view->getGoalPitchOffset_deg();
+ double gho = curr_view->getGoalHeadingOffset_deg();
+ double po = curr_view->getPitchOffset_deg();
+ double ho = curr_view->getHeadingOffset_deg();
+
+ double yaw = -(cockpit_view->getHeadingOffset_deg()-default_heading)*SG_DEGREES_TO_RADIANS;
+ double pitch = (cockpit_view->getPitchOffset_deg()-default_pitch)*SG_DEGREES_TO_RADIANS;
+ //double roll = fgGetDouble("/sim/view[0]/config/roll-offset-deg",0.0) //TODO: adjust for default roll offset
+ double sPitch = sin(pitch), cPitch = cos(pitch),
+ sYaw = sin(yaw), cYaw = cos(yaw);
+
+ //Assuming that the "Cockpit View" is always at position zero!!!
+ if (curr_view_id != 0) {
+ globals->get_viewmgr()->set_view(0);
+ globals->get_viewmgr()->copyToCurrent();
+ }
+ //Set the camera to the cockpit view to get the view of the runway from the cockpit
+ ssgSetCamera((sgVec4 *)cockpit_view->get_VIEW());
+ //Get the currently active runway and the 3d points
+ runway = get_active_runway();
+ get_rwy_points(points3d);
+ //Get the current project matrix
+ ssgGetProjectionMatrix(projMat);
+// const sgVec4 *viewMat = globals->get_current_view()->get_VIEW();
+ //Get the current model view matrix (cockpit view)
+ ssgGetModelviewMatrix(modelView);
+ //Create a rotation matrix to correct for any offsets (other than default offsets) to the model view matrix
+ sgMat4 xy; //rotation about the Rxy, negate the sin's on Ry
+ xy[0][0]=cYaw; xy[1][0]=0.0f; xy[2][0]=-sYaw; xy[3][0]=0.0f;
+ xy[0][1]=sPitch*-sYaw; xy[1][1]=cPitch; xy[2][1]=-sPitch*cYaw; xy[3][1]=0.0f;
+ xy[0][2]=cPitch*sYaw; xy[1][2]=sPitch; xy[2][2]=cPitch*cYaw; xy[3][2]=0.0f;
+ xy[0][3]=0.0f; xy[1][3]=0.0f; xy[2][3]=0.0f; xy[3][3]=1.0f;
+ //Re-center the model view
+ sgPostMultMat4(modelView,xy);
+ //copy float matrices to double
+ for (int i=0; i<4; i++) {
+ for (int j=0; j<4; j++) {
+ int idx = (i*4)+j;
+ mm[idx] = (double)modelView[i][j];
+ pm[idx] = (double)projMat[i][j];
+ }
+ }
+ //Calculate the 2D points via gluProject
+ int result = GL_TRUE;
+ for (int i=0; i<6; i++) {
+ result = gluProject(points3d[i][0],points3d[i][1],points3d[i][2],mm,pm,view,&points2d[i][0],&points2d[i][1],&points2d[i][2]);
+ }
+ //set the line width based on our distance from the runway
+ setLineWidth();
+ //Draw the runway lines on the HUD
+ glEnable(GL_LINE_STIPPLE);
+ glLineStipple(1,stippleOut);
+ anyLines =
+ drawLine(points3d[0],points3d[1],points2d[0],points2d[1]) | //draw top
+ drawLine(points3d[2],points3d[1],points2d[2],points2d[1]) | //draw right
+ drawLine(points3d[2],points3d[3],points2d[2],points2d[3]) | //draw bottom
+ drawLine(points3d[3],points3d[0],points2d[3],points2d[0]); //draw left
+ glLineStipple(1,stippleCen);
+ anyLines |= drawLine(points3d[5],points3d[4],points2d[5],points2d[4]); //draw center
+ //Check to see if arrow needs drawn
+ if ((!anyLines && drawIA) || drawIAAlways) {
+ drawArrow(); //draw indication arrow
+ }
+ //Restore the current view and any offsets
+ if (curr_view_id != 0) {
+ globals->get_viewmgr()->set_view(curr_view_id);
+ globals->get_viewmgr()->copyToCurrent();
+ curr_view->setHeadingOffset_deg(ho);
+ curr_view->setPitchOffset_deg(po);
+ curr_view->setGoalHeadingOffset_deg(gho);
+ curr_view->setGoalPitchOffset_deg(gpo);
+ }
+ //Set the camera back to the current view
+ ssgSetCamera((sgVec4 *)curr_view);
+ glPopAttrib();
+ }//if not broken
+}
+
+FGRunway runway_instr::get_active_runway() {
+ FGEnvironment stationweather =
+ ((FGEnvironmentMgr *)globals->get_subsystem("environment"))->getEnvironment();
+ double hdg = stationweather.get_wind_from_heading_deg();
+ FGRunway runway;
+ globals->get_runways()->search( fgGetString("/sim/presets/airport-id"), int(hdg), &runway);
+ return runway;
+}
+
+void runway_instr::get_rwy_points(sgdVec3 *points3d) {
+ static Point3D center = globals->get_scenery()->get_center();
+
+ //Get the current tile center
+ Point3D currentCenter = globals->get_scenery()->get_center();
+ Point3D tileCenter = currentCenter;
+ if (center != currentCenter) //if changing tiles
+ tileCenter = center; //use last center
+ double alt = current_aircraft.fdm_state->get_Runway_altitude()*SG_FEET_TO_METER;
+ double length = (runway.length/2.0)*SG_FEET_TO_METER;
+ double width = (runway.width/2.0)*SG_FEET_TO_METER;
+ double frontLat,frontLon,backLat,backLon,az,tempLat,tempLon;
+
+ geo_direct_wgs_84(alt,runway.lat,runway.lon,runway.heading,length,&backLat,&backLon,&az);
+ sgGeodToCart(backLat*SG_DEGREES_TO_RADIANS,backLon*SG_DEGREES_TO_RADIANS,alt,points3d[4]);
+
+ geo_direct_wgs_84(alt,runway.lat,runway.lon,runway.heading+180,length,&frontLat,&frontLon,&az);
+ sgGeodToCart(frontLat*SG_DEGREES_TO_RADIANS,frontLon*SG_DEGREES_TO_RADIANS,alt,points3d[5]);
+
+ geo_direct_wgs_84(alt,backLat,backLon,runway.heading+90,width,&tempLat,&tempLon,&az);
+ sgGeodToCart(tempLat*SG_DEGREES_TO_RADIANS,tempLon*SG_DEGREES_TO_RADIANS,alt,points3d[0]);
+
+ geo_direct_wgs_84(alt,backLat,backLon,runway.heading-90,width,&tempLat,&tempLon,&az);
+ sgGeodToCart(tempLat*SG_DEGREES_TO_RADIANS,tempLon*SG_DEGREES_TO_RADIANS,alt,points3d[1]);
+
+ geo_direct_wgs_84(alt,frontLat,frontLon,runway.heading-90,width,&tempLat,&tempLon,&az);
+ sgGeodToCart(tempLat*SG_DEGREES_TO_RADIANS,tempLon*SG_DEGREES_TO_RADIANS,alt,points3d[2]);
+
+ geo_direct_wgs_84(alt,frontLat,frontLon,runway.heading+90,width,&tempLat,&tempLon,&az);
+ sgGeodToCart(tempLat*SG_DEGREES_TO_RADIANS,tempLon*SG_DEGREES_TO_RADIANS,alt,points3d[3]);
+
+ for(int i = 0; i < 6; i++)
+ {
+ points3d[i][0] -= tileCenter.x();
+ points3d[i][1] -= tileCenter.y();
+ points3d[i][2] -= tileCenter.z();
+ }
+ center = currentCenter;
+}
+
+bool runway_instr::drawLine(sgdVec3 a1, sgdVec3 a2, sgdVec3 point1, sgdVec3 point2) {
+ sgdVec3 p1, p2;
+ sgdCopyVec3(p1, point1);
+ sgdCopyVec3(p2, point2);
+ bool p1Inside = (p1[0]>=location.left && p1[0]<=location.right && p1[1]>=location.bottom && p1[1]<=location.top);
+ bool p1Insight = (p1[2] >= 0.0 && p1[2] < 1.0);
+ bool p1Valid = p1Insight && p1Inside;
+ bool p2Inside = (p2[0]>=location.left && p2[0]<=location.right && p2[1]>=location.bottom && p2[1]<=location.top);
+ bool p2Insight = (p2[2] >= 0.0 && p2[2] < 1.0);
+ bool p2Valid = p2Insight && p2Inside;
+
+ if (p1Valid && p2Valid) { //Both project points are valid, draw the line
+ glBegin(GL_LINES);
+ glVertex2d(p1[0],p1[1]);
+ glVertex2d(p2[0],p2[1]);
+ glEnd();
+ }
+ else if (p1Valid) { //p1 is valid and p2 is not, calculate a new valid point
+ sgdVec3 vec = {a2[0]-a1[0], a2[1]-a1[1], a2[2]-a1[2]};
+ //create the unit vector
+ sgdScaleVec3(vec,1.0/sgdLengthVec3(vec));
+ sgdVec3 newPt;
+ sgdCopyVec3(newPt,a1);
+ sgdAddVec3(newPt,vec);
+ if (gluProject(newPt[0],newPt[1],newPt[2],mm,pm,view,&p2[0],&p2[1],&p2[2]) && (p2[2]>0&&p2[2]<1.0) ) {
+ boundPoint(p1,p2);
+ glBegin(GL_LINES);
+ glVertex2d(p1[0],p1[1]);
+ glVertex2d(p2[0],p2[1]);
+ glEnd();
+ }
+ }
+ else if (p2Valid) { //p2 is valid and p1 is not, calculate a new valid point
+ sgdVec3 vec = {a1[0]-a2[0], a1[1]-a2[1], a1[2]-a2[2]};
+ //create the unit vector
+ sgdScaleVec3(vec,1.0/sgdLengthVec3(vec));
+ sgdVec3 newPt;
+ sgdCopyVec3(newPt,a2);
+ sgdAddVec3(newPt,vec);
+ if (gluProject(newPt[0],newPt[1],newPt[2],mm,pm,view,&p1[0],&p1[1],&p1[2]) && (p1[2]>0&&p1[2]<1.0)) {
+ boundPoint(p2,p1);
+ glBegin(GL_LINES);
+ glVertex2d(p2[0],p2[1]);
+ glVertex2d(p1[0],p1[1]);
+ glEnd();
+ }
+ }
+ else if (p1Insight && p2Insight) { //both points are insight, but not inside
+ bool v = boundOutsidePoints(p1,p2);
+ if (v) {
+ glBegin(GL_LINES);
+ glVertex2d(p1[0],p1[1]);
+ glVertex2d(p2[0],p2[1]);
+ glEnd();
+ }
+ return v;
+ }
+ //else both points are not insight, don't draw anything
+ return (p1Valid && p2Valid);
+}
+
+void runway_instr::boundPoint(sgdVec3 v, sgdVec3 m) {
+ double y = v[1];
+ if(m[1] < v[1]) {
+ y = location.bottom;
+ }
+ else if(m[1] > v[1]) {
+ y = location.top;
+ }
+ if (m[0] == v[0]) {
+ m[1]=y;
+ return; //prevent divide by zero
+ }
+ double slope = (m[1]-v[1])/(m[0]-v[0]);
+ m[0] = (y-v[1])/slope + v[0];
+ m[1] = y;
+ if (m[0] < location.left) {
+ m[0] = location.left;
+ m[1] = slope * (location.left-v[0])+v[1];
+ }
+ else if (m[0] > location.right) {
+ m[0] = location.right;
+ m[1] = slope * (location.right-v[0])+v[1];
+ }
+}
+
+bool runway_instr::boundOutsidePoints(sgdVec3 v, sgdVec3 m) {
+ bool pointsInvalid = (v[1]>location.top && m[1]>location.top) ||
+ (v[1]<location.bottom && m[1]<location.bottom) ||
+ (v[0]>location.right && m[0]>location.right) ||
+ (v[0]<location.left && m[0]<location.left);
+ if (pointsInvalid)
+ return false;
+ if (m[0] == v[0]) {//x's are equal, vertical line
+ if (m[1]>v[1]) {
+ m[1]=location.top;
+ v[1]=location.bottom;
+ }
+ else {
+ v[1]=location.top;
+ m[1]=location.bottom;
+ }
+ return true;
+ }
+ if (m[1] == v[1]) { //y's are equal, horizontal line
+ if (m[0] > v[0]) {
+ m[0] = location.right;
+ v[0] = location.left;
+ }
+ else {
+ v[0] = location.right;
+ m[0] = location.left;
+ }
+ return true;
+ }
+ double slope = (m[1]-v[1])/(m[0]-v[0]);
+ double b = v[1]-(slope*v[0]);
+ double y1 = slope * location.left + b;
+ double y2 = slope * location.right + b;
+ double x1 = (location.bottom - b) / slope;
+ double x2 = (location.top - b) / slope;
+ int counter = 0;
+ if (y1 >= location.bottom && y1 <= location.top) {
+ v[0] = location.left;
+ v[1] = y1;
+ counter++;
+ }
+ if (y2 >= location.bottom && y2 <= location.top) {
+ if (counter > 0) {
+ m[0] = location.right;
+ m[1] = y2;
+ }
+ else {
+ v[0] = location.right;
+ v[1] = y2;
+ }
+ counter++;
+ }
+ if (x1 >= location.left && x1 <= location.right) {
+ if (counter > 0) {
+ m[0] = x1;
+ m[1] = location.bottom;
+ }
+ else {
+ v[0] = x1;
+ v[1] = location.bottom;
+ }
+ counter++;
+ }
+ if (x2 >= location.left && x2 <= location.right) {
+ m[0] = x1;
+ m[1] = location.bottom;
+ counter++;
+ }
+ return (counter == 2);
+}
+
+void runway_instr::drawArrow() {
+ Point3D ac,rwy;
+ ac.setlat(current_aircraft.fdm_state->get_Latitude_deg());
+ ac.setlon(current_aircraft.fdm_state->get_Longitude_deg());
+ rwy.setlat(runway.lat);
+ rwy.setlon(runway.lon);
+ float theta = GetHeadingFromTo(ac,rwy);
+ theta -= fgGetDouble("/orientation/heading-deg");
+ theta = -theta;
+ glMatrixMode(GL_MODELVIEW);
+ glPushMatrix();
+ glTranslated((location.right+location.left)/2.0,(location.top+location.bottom)/2.0,0.0);
+ glRotated(theta,0.0,0.0,1.0);
+ glTranslated(0.0,arrowRad,0.0);
+ glScaled(arrowScale,arrowScale,0.0);
+ glBegin(GL_TRIANGLES);
+ glVertex2d(-5.0,12.5);
+ glVertex2d(0.0,25.0);
+ glVertex2d(5.0,12.5);
+ glEnd();
+ glBegin(GL_QUADS);
+ glVertex2d(-2.5,0.0);
+ glVertex2d(-2.5,12.5);
+ glVertex2d(2.5,12.5);
+ glVertex2d(2.5,0.0);
+ glEnd();
+ glPopMatrix();
+}
+
+void runway_instr::setLineWidth() {
+ //Calculate the distance from the runway, A
+ double course, distance;
+ calc_gc_course_dist(Point3D(runway.lon*SGD_DEGREES_TO_RADIANS, runway.lat*SGD_DEGREES_TO_RADIANS, 0.0),
+ Point3D(current_aircraft.fdm_state->get_Longitude(),current_aircraft.fdm_state->get_Latitude(), 0.0 ),
+ &course, &distance);
+ distance *= SG_METER_TO_NM;
+ //Get altitude above runway, B
+ double alt_nm = get_agl();
+ static const SGPropertyNode *startup_units_node
+ = fgGetNode("/sim/startup/units");
+ 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(A²+B²)
+ 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;}
+
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