// HUD_runway.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. #ifdef HAVE_CONFIG_H # include #endif #include #include #include #include #include
#include #include #include #include #include #include #include
#include
#include #include "HUD.hxx" HUD::Runway::Runway(HUD *hud, const SGPropertyNode *node, float x, float y) : Item(hud, node, x, y), _agl(fgGetNode("/position/altitude-agl-ft", true)), _arrow_scale(node->getDoubleValue("arrow-scale", 1.0)), _arrow_radius(node->getDoubleValue("arrow-radius")), _line_scale(node->getDoubleValue("line-scale", 1.0)), _scale_dist(node->getDoubleValue("scale-dist-nm")), _default_pitch(fgGetDouble("/sim/view[0]/config/pitch-pitch-deg", 0.0)), _default_heading(fgGetDouble("/sim/view[0]/config/pitch-heading-deg", 0.0)), _cockpit_view(globals->get_viewmgr()->get_view(0)), _stipple_out(node->getIntValue("outer_stipple", 0xFFFF)), _stipple_center(node->getIntValue("center-stipple", 0xFFFF)), _draw_arrow(_arrow_scale > 0 ? true : false), _draw_arrow_always(_arrow_scale > 0 ? node->getBoolValue("arrow-always") : false) { _view[0] = 0; _view[1] = 0; _view[2] = 640; _view[3] = 480; _center_x = _view[2] / 2; _center_y = _view[3] / 2; _left = _center_x - (_w / 2) + _x; _right = _center_x + (_w / 2) + _x; _bottom = _center_y - (_h / 2) + _y; _top = _center_y + (_h / 2) + _y; } void HUD::Runway::draw() { if (!get_active_runway(_runway)) return; 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 // OSGFIXME // ssgSetCamera((sgVec4 *)_cockpit_view->get_VIEW()); get_rwy_points(_points3d); //Get the current project matrix // OSGFIXME // ssgGetProjectionMatrix(projMat); // const sgVec4 *viewMat = globals->get_current_view()->get_VIEW(); //Get the current model view matrix (cockpit view) // OSGFIXME // 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, _stipple_out); 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, _stipple_center); anyLines |= drawLine(_points3d[5], _points3d[4], _points2d[5], _points2d[4]); //draw center //Check to see if arrow needs drawn if ((!anyLines && _draw_arrow) || _draw_arrow_always) { 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 // OSGFIXME // ssgSetCamera((sgVec4 *)curr_view); glPopAttrib(); } bool HUD::Runway::get_active_runway(FGRunway& runway) { FGEnvironment stationweather = ((FGEnvironmentMgr *)globals->get_subsystem("environment"))->getEnvironment(); double hdg = stationweather.get_wind_from_heading_deg(); return globals->get_runways()->search(fgGetString("/sim/presets/airport-id"), int(hdg), &runway); } void HUD::Runway::get_rwy_points(sgdVec3 *_points3d) { 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]); } bool HUD::Runway::drawLine(const sgdVec3& a1, const sgdVec3& a2, const sgdVec3& point1, const sgdVec3& point2) { sgdVec3 p1, p2; sgdCopyVec3(p1, point1); sgdCopyVec3(p2, point2); bool p1Inside = (p1[0] >= _left && p1[0] <= _right && p1[1] >= _bottom && p1[1] <= _top); bool p1Insight = (p1[2] >= 0.0 && p1[2] < 1.0); bool p1Valid = p1Insight && p1Inside; bool p2Inside = (p2[0] >= _left && p2[0] <= _right && p2[1] >= _bottom && p2[1] <= _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 HUD::Runway::boundPoint(const sgdVec3& v, sgdVec3& m) { double y = v[1]; if (m[1] < v[1]) y = _bottom; else if (m[1] > v[1]) y = _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] < _left) { m[0] = _left; m[1] = slope * (_left - v[0]) + v[1]; } else if (m[0] > _right) { m[0] = _right; m[1] = slope * (_right - v[0]) + v[1]; } } bool HUD::Runway::boundOutsidePoints(sgdVec3& v, sgdVec3& m) { bool pointsInvalid = (v[1] > _top && m[1] > _top) || (v[1] < _bottom && m[1] < _bottom) || (v[0] > _right && m[0] > _right) || (v[0] < _left && m[0] < _left); if (pointsInvalid) return false; if (m[0] == v[0]) {//x's are equal, vertical line if (m[1] > v[1]) { m[1] = _top; v[1] = _bottom; } else { v[1] = _top; m[1] = _bottom; } return true; } if (m[1] == v[1]) { //y's are equal, horizontal line if (m[0] > v[0]) { m[0] = _right; v[0] = _left; } else { v[0] = _right; m[0] = _left; } return true; } double slope = (m[1] - v[1]) / (m[0] - v[0]); double b = v[1] - (slope * v[0]); double y1 = slope * _left + b; double y2 = slope * _right + b; double x1 = (_bottom - b) / slope; double x2 = (_top - b) / slope; int counter = 0; if (y1 >= _bottom && y1 <= _top) { v[0] = _left; v[1] = y1; counter++; } if (y2 >= _bottom && y2 <= _top) { if (counter > 0) { m[0] = _right; m[1] = y2; } else { v[0] = _right; v[1] = y2; } counter++; } if (x1 >= _left && x1 <= _right) { if (counter > 0) { m[0] = x1; m[1] = _bottom; } else { v[0] = x1; v[1] = _bottom; } counter++; } if (x2 >= _left && x2 <= _right) { m[0] = x1; m[1] = _bottom; counter++; } return (counter == 2); } void HUD::Runway::drawArrow() { Point3D ac(0.0), rwy(0.0); 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((_right + _left) / 2.0, (_top + _bottom) / 2.0, 0.0); glRotated(theta, 0.0, 0.0, 1.0); glTranslated(0.0, _arrow_radius, 0.0); glScaled(_arrow_scale, _arrow_scale, 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 HUD::Runway::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 = _agl->getDoubleValue(); if (_hud->getUnits() == FEET) alt_nm *= SG_FEET_TO_METER; alt_nm *= SG_METER_TO_NM; //Calculate distance away from runway, C = v(AČ+BČ) distance = sqrt(alt_nm * alt_nm + distance*distance); if (distance < _scale_dist) glLineWidth(1.0 + ((_line_scale - 1) * ((_scale_dist - distance) / _scale_dist))); else glLineWidth(1.0); }