#include "hud.hxx" #include "panel.hxx" #define DO_PANEL_HACK //====================== Top of HudLadder Class ======================= HudLadder :: HudLadder( string name, int x, int y, UINT width, UINT height, float factr, FLTFNPTR ptch_source, FLTFNPTR roll_source, float span_units, float major_div, float minor_div, UINT screen_hole, UINT lbl_pos, bool frl_spot, bool target, bool vel_vec, bool drift, bool alpha, bool energy, bool climb, bool glide, float glide_slope_val, bool worm_energy, bool waypoint, bool working, int zenithsymbol, //suma int nadirsymbol, //suma int hat_marker): //suma dual_instr_item( x, y, width, height, ptch_source, roll_source, working, HUDS_RIGHT), width_units ( (int)(span_units) ), div_units ( (int)(major_div < 0? -major_div: major_div) ), minor_div ( (int)(minor_div) ), label_pos ( lbl_pos ), scr_hole ( screen_hole ), vmax ( span_units/2 ), vmin ( -vmax ), factor ( factr ), hudladder_type ( name ), frl ( frl_spot ), target_spot ( target ), velocity_vector ( vel_vec ), drift_marker ( drift ), alpha_bracket ( alpha ), energy_marker ( energy ), climb_dive_marker ( climb ), glide_slope_marker ( glide ), glide_slope ( glide_slope_val), energy_worm ( worm_energy), waypoint_marker ( waypoint) { zenith= zenithsymbol; //suma nadir=nadirsymbol; //suma hat= hat_marker; //suma if( !width_units ) { width_units = 45; } } HudLadder :: ~HudLadder() { } HudLadder :: HudLadder( const HudLadder & image ) : dual_instr_item ( (dual_instr_item &) image), width_units ( image.width_units ), div_units ( image.div_units ), label_pos ( image.label_pos ), scr_hole ( image.scr_hole ), vmax ( image.vmax ), vmin ( image.vmin ), factor ( image.factor ), hudladder_type ( image.hudladder_type), frl ( image.frl), target_spot ( image.target_spot), velocity_vector ( image.velocity_vector), drift_marker ( image.drift_marker), alpha_bracket ( image.alpha_bracket), energy_marker ( image.energy_marker), climb_dive_marker ( image.climb_dive_marker), glide_slope_marker ( image.glide_slope_marker), glide_slope ( image.glide_slope), energy_worm ( image.energy_worm), waypoint_marker ( image.waypoint_marker) { } HudLadder & HudLadder :: operator = ( const HudLadder & rhs ) { if( !(this == &rhs)) { (dual_instr_item &)(*this) = (dual_instr_item &)rhs; width_units = rhs.width_units; div_units = rhs.div_units; label_pos = rhs.label_pos; scr_hole = rhs.scr_hole; vmax = rhs.vmax; vmin = rhs.vmin; factor = rhs.factor; hudladder_type = rhs.hudladder_type; frl = rhs.frl; velocity_vector = rhs.velocity_vector; drift_marker = rhs.drift_marker; alpha_bracket = rhs.alpha_bracket; energy_marker = rhs.energy_marker; climb_dive_marker = rhs.climb_dive_marker; target_spot = rhs.target_spot; glide_slope_marker = rhs.glide_slope_marker; glide_slope = rhs.glide_slope; energy_worm = rhs.energy_worm; waypoint_marker = rhs.waypoint_marker; } return *this; } // // Draws a climb ladder in the center of the HUD // void HudLadder :: draw( void ) { float x_ini,x_ini2; float x_end,x_end2; float y = 0; int count; float cosine, sine, xvvr, yvvr, Vxx = 0.0, Vyy = 0.0, Vzz = 0.0, up_vel, ground_vel, actslope = 0.0; float Axx = 0.0, Ayy = 0.0, Azz = 0.0, total_vel = 0.0, pot_slope, t1, t2 = 0.0, psi = 0.0, alpha,pla; float vel_x = 0.0, vel_y = 0.0, drift; // char Textaux[8] ; bool pitch_ladder = false; bool climb_dive_ladder = false; bool clip_plane = false; GLdouble eqn_top[4] = {0.0,-1.0,0.0,0.0}; GLdouble eqn_left[4] = {-1.0,0.0,0.0,100.0}; GLdouble eqn_right[4] = {1.0,0.0,0.0,100.0}; POINT centroid = get_centroid(); RECT box = get_location(); float half_span = box.right / 2.0; float roll_value = current_ch2(); alpha = get_aoa(); pla = get_throttleval(); #ifdef ENABLE_SP_FMDS int lgear,wown,wowm,ilcanclaw,ihook; ilcanclaw = get_iaux2(); lgear = get_iaux3(); wown = get_iaux4(); wowm = get_iaux5(); ihook = get_iaux6(); #endif float pitch_value = current_ch1() * SGD_RADIANS_TO_DEGREES; if(hudladder_type=="Climb/Dive Ladder") { pitch_ladder = false; climb_dive_ladder = true; clip_plane = true; } else // hudladder_type=="Pitch Ladder" { pitch_ladder = true; climb_dive_ladder = false; clip_plane = false; } //************************************************************** glPushMatrix(); // define (0,0) as center of screen glTranslatef( centroid.x, centroid.y, 0); // OBJECT STATIC RETICLE // TYPE FRL // ATTRIB - ALWAYS // Draw the FRL spot and line if(frl) { #define FRL_DIAMOND_SIZE 2.0 glBegin(GL_LINE_LOOP); glVertex2f( -FRL_DIAMOND_SIZE, 0.0); glVertex2f(0.0, FRL_DIAMOND_SIZE); glVertex2f( FRL_DIAMOND_SIZE, 0.0); glVertex2f(0.0, -FRL_DIAMOND_SIZE); glEnd(); glBegin(GL_LINE_STRIP); glVertex2f(0, FRL_DIAMOND_SIZE); glVertex2f(0, 8.0 ); glEnd(); #undef FRL_DIAMOND_SIZE } // TYPE WATERLINE_MARK (W shaped _ _ ) // \/\/ //**************************************************************** // TYPE TARGET_SPOT // Draw the target spot. if (target_spot) { #define CENTER_DIAMOND_SIZE 6.0 glBegin(GL_LINE_LOOP); glVertex2f( -CENTER_DIAMOND_SIZE, 0.0); glVertex2f(0.0, CENTER_DIAMOND_SIZE); glVertex2f( CENTER_DIAMOND_SIZE, 0.0); glVertex2f(0.0, -CENTER_DIAMOND_SIZE); glEnd(); #undef CENTER_DIAMOND_SIZE } //**************************************************************** //velocity vector reticle - computations if(velocity_vector) { Vxx = get_Vx(); Vyy = get_Vy(); Vzz = get_Vz(); Axx = get_Ax(); Ayy = get_Ay(); Azz = get_Az(); psi = get_heading(); if (psi > 180.0) psi = psi - 360; total_vel = sqrt(Vxx*Vxx + Vyy*Vyy + Vzz*Vzz); ground_vel = sqrt(Vxx*Vxx + Vyy*Vyy); up_vel = Vzz; if (ground_vel < 2.0) { if (fabs(up_vel) < 2.0) { actslope = 0.0; } else { actslope = (up_vel/fabs(up_vel))*90.0; } } else { actslope = atan(up_vel/ground_vel)*SGD_RADIANS_TO_DEGREES; } xvvr = (((atan2(Vyy,Vxx)*SGD_RADIANS_TO_DEGREES)-psi)* (factor/globals->get_current_view()->get_aspect_ratio())); drift = ((atan2(Vyy,Vxx)*SGD_RADIANS_TO_DEGREES)-psi); yvvr = ((actslope - pitch_value)*factor); vel_y = ((actslope -pitch_value) * cos(roll_value) + drift*sin(roll_value))*factor; vel_x = (-(actslope -pitch_value)*sin(roll_value) + drift*cos(roll_value))* (factor/globals->get_current_view()->get_aspect_ratio()); // printf("%f %f %f %f\n",vel_x,vel_y,drift,psi); //**************************************************************** // OBJECT MOVING RETICLE // TYPE - DRIFT MARKER // ATTRIB - ALWAYS // drift marker if(drift_marker) { glBegin(GL_LINE_STRIP); glVertex2f((xvvr*25/120)-6, -4); glVertex2f(xvvr*25/120, 8); glVertex2f((xvvr*25/120)+6, -4); glEnd(); } //**************************************************************** // Clipping coordinates for ladder to be input from xml file // Clip hud ladder if (clip_plane) { glClipPlane(GL_CLIP_PLANE0,eqn_top); glEnable(GL_CLIP_PLANE0); glClipPlane(GL_CLIP_PLANE1,eqn_left); glEnable(GL_CLIP_PLANE1); glClipPlane(GL_CLIP_PLANE2,eqn_right); glEnable(GL_CLIP_PLANE2); // glScissor(-100,-240,200,240); // glEnable(GL_SCISSOR_TEST); } //**************************************************************** // OBJECT MOVING RETICLE // TYPE VELOCITY VECTOR // ATTRIB - ALWAYS // velocity vector glBegin(GL_LINE_LOOP); // Use polygon to approximate a circle for(count=0; count<50; count++) { cosine = 6 * cos(count * 2 * SGD_PI/50.0); sine = 6 * sin(count * 2 * SGD_PI/50.0); glVertex2f(cosine+vel_x, sine+vel_y); } glEnd(); //velocity vector reticle orientation lines glBegin(GL_LINE_STRIP); glVertex2f(vel_x-12, vel_y); glVertex2f(vel_x-6, vel_y); glEnd(); glBegin(GL_LINE_STRIP); glVertex2f(vel_x+12, vel_y); glVertex2f(vel_x+6, vel_y); glEnd(); glBegin(GL_LINE_STRIP); glVertex2f(vel_x, vel_y+12); glVertex2f(vel_x, vel_y+6); glEnd(); #ifdef ENABLE_SP_FMDS // OBJECT MOVING RETICLE // TYPE LINE // ATTRIB - ON CONDITION if (lgear == 1) { // undercarriage status glBegin(GL_LINE_STRIP); glVertex2f(vel_x+8, vel_y); glVertex2f(vel_x+8, vel_y-4); glEnd(); // OBJECT MOVING RETICLE // TYPE LINE // ATTRIB - ON CONDITION glBegin(GL_LINE_STRIP); glVertex2f(vel_x-8, vel_y); glVertex2f(vel_x-8, vel_y-4); glEnd(); // OBJECT MOVING RETICLE // TYPE LINE // ATTRIB - ON CONDITION glBegin(GL_LINE_STRIP); glVertex2f(vel_x, vel_y-6); glVertex2f(vel_x, vel_y-10); glEnd(); } // OBJECT MOVING RETICLE // TYPE V // ATTRIB - ON CONDITION if (ihook == 1) { // arrestor hook status glBegin(GL_LINE_STRIP); glVertex2f(vel_x-4, vel_y-8); glVertex2f(vel_x, vel_y-10); glVertex2f(vel_x+4, vel_y-8); glEnd(); } #endif }//if velocity_vector //*************************************************************** // OBJECT MOVING RETICLE // TYPE - SQUARE_BRACKET // ATTRIB - ON CONDITION // alpha bracket #ifdef ENABLE_SP_FMDS if (alpha_bracket) { if (ihook == 1) { glBegin(GL_LINE_STRIP); glVertex2f(vel_x-20 , vel_y-(16-alpha)*factor); glVertex2f(vel_x-17, vel_y-(16-alpha)*factor); glVertex2f(vel_x-17, vel_y-(14-alpha)*factor); glVertex2f(vel_x-20, vel_y-(14-alpha)*factor); glEnd(); glBegin(GL_LINE_STRIP); glVertex2f(vel_x+20 , vel_y-(16-alpha)*factor); glVertex2f(vel_x+17, vel_y-(16-alpha)*factor); glVertex2f(vel_x+17, vel_y-(14-alpha)*factor); glVertex2f(vel_x+20, vel_y-(14-alpha)*factor); glEnd(); } } #endif //printf("xvr=%f,yvr=%f,Vx=%f,Vy=%f,Vz=%f\n",xvvr,yvvr,Vx,Vy,Vz); //printf("Ax=%f,Ay=%f,Az=%f\n",Ax,Ay,Az); //**************************************************************** // OBJECT MOVING RETICLE // TYPE ENERGY_MARKERS // ATTRIB - ALWAYS //energy markers - compute potential slope if(energy_marker) { if (total_vel < 5.0) { t1 = 0; t2 = 0; } else { t1 = up_vel/total_vel; t2 = asin((Vxx*Axx + Vyy*Ayy + Vzz*Azz)/(9.81*total_vel)); } pot_slope = ((t2/3)*SGD_RADIANS_TO_DEGREES)*factor + vel_y; // if (pot_slope < (vel_y - 45)) pot_slope = vel_y-45; // if (pot_slope > (vel_y + 45)) pot_slope = vel_y+45; //energy markers glBegin(GL_LINE_STRIP); glVertex2f(vel_x-20, pot_slope-5); glVertex2f(vel_x-15, pot_slope); glVertex2f(vel_x-20, pot_slope+5); glEnd(); glBegin(GL_LINE_STRIP); glVertex2f(vel_x+20, pot_slope-5); glVertex2f(vel_x+15, pot_slope); glVertex2f(vel_x+20, pot_slope+5); glEnd(); if (pla > (105.0/131.0)) { glBegin(GL_LINE_STRIP); glVertex2f(vel_x-24, pot_slope-5); glVertex2f(vel_x-19, pot_slope); glVertex2f(vel_x-24, pot_slope+5); glEnd(); glBegin(GL_LINE_STRIP); glVertex2f(vel_x+24, pot_slope-5); glVertex2f(vel_x+19, pot_slope); glVertex2f(vel_x+24, pot_slope+5); glEnd(); } } //********************************************************** // ramp reticle // OBJECT STATIC RETICLE // TYPE LINE // ATTRIB - ON CONDITION #ifdef ENABLE_SP_FMDS if (energy_worm) { if (ilcanclaw == 1) { glBegin(GL_LINE_STRIP); glVertex2f(-15, -134); glVertex2f(15, -134); glEnd(); // OBJECT MOVING RETICLE // TYPE BOX // ATTRIB - ON CONDITION glBegin(GL_LINE_STRIP); glVertex2f(-6, -134); glVertex2f(-6, t2*SGD_RADIANS_TO_DEGREES*4.0 - 134); glVertex2f(+6, t2*SGD_RADIANS_TO_DEGREES*4.0 - 134); glVertex2f(6, -134); glEnd(); // OBJECT MOVING RETICLE // TYPE DIAMOND // ATTRIB - ON CONDITION glBegin(GL_LINE_LOOP); glVertex2f(-6, actslope*4.0 - 134); glVertex2f(0, actslope*4.0 -134 +3); glVertex2f(6, actslope*4.0 - 134); glVertex2f(0, actslope*4.0 -134 -3); glEnd(); } } #endif //************************************************************* // OBJECT MOVING RETICLE // TYPE DIAMOND // ATTRIB - ALWAYS // Draw the locked velocity vector. if(climb_dive_marker) { glBegin(GL_LINE_LOOP); glVertex2f( -3.0, 0.0+vel_y); glVertex2f(0.0, 6.0+vel_y); glVertex2f( 3.0, 0.0+vel_y); glVertex2f(0.0, -6.0+vel_y); glEnd(); } //**************************************************************** if(climb_dive_ladder) { // CONFORMAL_HUD vmin = pitch_value - (float)width_units; vmax = pitch_value + (float)width_units; glTranslatef( vel_x, vel_y, 0); } else // pitch_ladder - Default Hud { vmin = pitch_value - (float)width_units * 0.5f; vmax = pitch_value + (float)width_units * 0.5f; } glRotatef(roll_value * SGD_RADIANS_TO_DEGREES, 0.0, 0.0, 1.0); // FRL marker not rotated - this line shifted below if( div_units ) { char TextLadder[8] ; float label_length ; float label_height ; float left ; float right ; float bot ; float top ; float text_offset = 4.0f ; float zero_offset = 0.0; if ( climb_dive_ladder ) { zero_offset = 50.0f ; // horizon line is wider by this much (hard coded ??) } else { zero_offset = 10.0f ; } fntFont *font = HUDtext->getFont(); float pointsize = HUDtext->getPointSize(); float italic = HUDtext->getSlant(); TextList.setFont( HUDtext ); TextList.erase(); LineList.erase(); StippleLineList.erase(); int last = FloatToInt(vmax)+1; int i = FloatToInt(vmin); if( !scr_hole ) { x_end = half_span; for( ; igetBBox ( TextLadder, pointsize, italic, &left, &right, &bot, &top ) ; label_length = right - left; label_length += text_offset; label_height = (top - bot)/2.0f; x_ini = -half_span; if( i >= 0 ) { // Make zero point wider on left if( i == 0 ) x_ini -= zero_offset; // Zero or above draw solid lines Line(x_ini, y, x_end, y); if(i == 90) if(zenith == 1) { drawZenith(x_ini, x_end,y); } } else { // Below zero draw dashed lines. StippleLine(x_ini, y, x_end, y); if(i == -90) if(nadir ==1) { drawNadir(x_ini, x_end,y); } } // Calculate the position of the left text and write it. Text( x_ini-label_length, y-label_height, TextLadder ); Text( x_end+text_offset, y-label_height, TextLadder ); } } } else // if(scr_hole ) { // Draw ladder with space in the middle of the lines float hole = (float)((scr_hole)/2.0f); x_end = -half_span + hole; x_ini2= half_span - hole; for( ; igetBBox ( TextLadder, pointsize, italic, &left, &right, &bot, &top ) ; label_length = right - left; label_length += text_offset; label_height = (top - bot)/2.0f; // printf("l %f r %f b %f t %f\n",left, right, bot, top ); // Start by calculating the points and drawing the // left side lines. x_ini = -half_span; x_end2= half_span; if( i >= 0 ) { // Make zero point wider on left if( i == 0 ) { x_ini -= zero_offset; x_end2 +=zero_offset; } //draw climb bar vertical lines if(climb_dive_ladder) { // Zero or above draw solid lines Line(x_end, y-5.0, x_end, y); Line(x_ini2, y-5.0, x_ini2, y); } // draw pitch / climb bar Line(x_ini, y, x_end, y); Line(x_ini2, y, x_end2, y); if(i == 90) if(zenith == 1) { drawZenith(x_ini2, x_end,y); } } else // i < 0 { // draw dive bar vertical lines if(climb_dive_ladder) { Line(x_end, y+5.0, x_end, y); Line(x_ini2, y+5.0, x_ini2, y); } // draw pitch / dive bars StippleLine(x_ini, y, x_end, y); StippleLine(x_ini2, y, x_end2, y); if(i == -90) if(nadir == 1) { drawNadir(x_ini2, x_end,y); } } // Now calculate the location of the left side label using Text( x_ini-label_length, y-label_height, TextLadder ); Text (x_end2+text_offset, y-label_height, TextLadder ); } } // OBJECT LADDER MARK // TYPE LINE // ATTRIB - ON CONDITION // draw appraoch glide slope marker #ifdef ENABLE_SP_FMDS if (glide_slope_marker) { if (ihook) { Line(-half_span+15, (glide_slope-actslope)*factor, -half_span + hole, (glide_slope-actslope)*factor); Line(half_span-15, (glide_slope-actslope)*factor, half_span - hole, (glide_slope-actslope)*factor); } }// if glide_slope_marker #endif } TextList.draw(); glLineWidth(0.2); LineList.draw(); glEnable(GL_LINE_STIPPLE); glLineStipple( 1, 0x00FF ); StippleLineList.draw( ); glDisable(GL_LINE_STIPPLE); } glDisable(GL_CLIP_PLANE0); glDisable(GL_CLIP_PLANE1); glDisable(GL_CLIP_PLANE2); // glDisable(GL_SCISSOR_TEST); glPopMatrix(); //************************************************************* //************************************************************* #ifdef ENABLE_SP_FMDS if(waypoint_marker) { //waypoint marker computation float fromwp_lat,towp_lat,fromwp_lon,towp_lon,dist,delx,dely,hyp,theta,brg; fromwp_lon = get_longitude()*SGD_DEGREES_TO_RADIANS; fromwp_lat = get_latitude()*SGD_DEGREES_TO_RADIANS; towp_lon = get_aux2()*SGD_DEGREES_TO_RADIANS; towp_lat = get_aux1()*SGD_DEGREES_TO_RADIANS; dist = acos(sin(fromwp_lat)*sin(towp_lat)+cos(fromwp_lat)*cos(towp_lat)*cos(fabs(fromwp_lon-towp_lon))); delx= towp_lat - fromwp_lat; dely = towp_lon - fromwp_lon; hyp = sqrt(pow(delx,2)+pow(dely,2)); if (hyp != 0) { theta = asin(dely/hyp); } else { theta = 0.0; } brg = theta*SGD_RADIANS_TO_DEGREES; if (brg > 360.0) brg = 0.0; if (delx < 0) brg = 180 - brg; // {Brg = asin(cos(towp_lat)*sin(fabs(fromwp_lon-towp_lon))/ sin(dist)); // Brg = Brg * SGD_RADIANS_TO_DEGREES; } dist = dist*SGD_RADIANS_TO_DEGREES * 60.0*1852.0; //rad->deg->nm->m // end waypoint marker computation //********************************************************* // OBJECT MOVING RETICLE // TYPE ARROW // waypoint marker if (fabs(brg-psi) > 10.0) { glPushMatrix(); glTranslatef( centroid.x, centroid.y, 0); glTranslatef( vel_x, vel_y, 0); glRotatef(brg - psi,0.0,0.0,-1.0); glBegin(GL_LINE_LOOP); glVertex2f(-2.5,20.0); glVertex2f(-2.5,30.0); glVertex2f(-5.0,30.0); glVertex2f(0.0,35.0); glVertex2f(5.0,30.0); glVertex2f(2.5,30.0); glVertex2f(2.5,20.0); glEnd(); glPopMatrix(); } // waypoint marker on heading scale if (fabs(brg-psi) < 12.0) { if(hat ==0) { glBegin(GL_LINE_LOOP); glVertex2f(((brg-psi)*60/25)+320,240.0); glVertex2f(((brg-psi)*60/25)+326,240.0-4); glVertex2f(((brg-psi)*60/25)+323,240.0-4); glVertex2f(((brg-psi)*60/25)+323,240.0-8); glVertex2f(((brg-psi)*60/25)+317,240.0-8); glVertex2f(((brg-psi)*60/25)+317,240.0-4); glVertex2f(((brg-psi)*60/25)+314,240.0-4); glEnd(); } else {//if hat=0 float x= (brg-psi)*60/25 + 320, y=240.0, r=5.0; float x1,y1; glEnable(GL_POINT_SMOOTH); glBegin(GL_POINTS); for(int count=0; count<=200; count++) { float temp = count * 3.142 * 3 / (200.0*2.0); float temp1 = temp-(45.0*SGD_DEGREES_TO_RADIANS); x1 = x + r * cos(temp1); y1 = y + r * sin(temp1); glVertex2f(x1, y1); } glEnd(); glDisable(GL_POINT_SMOOTH); } //hat=0 } //brg<12 } // if waypoint_marker #endif }//draw /******************************************************************/ //begin suma // draws the zenith symbol for highest possible climb angle (i,e 90 degree climb angle) void HudLadder :: drawZenith(float xfirst,float xlast,float yvalue ) { float xcentre = (xfirst + xlast)/2.0; float ycentre = yvalue; Line(xcentre-9.0, ycentre, xcentre-3.0, ycentre+1.3); Line(xcentre-9.0, ycentre, xcentre-3.0, ycentre-1.3); Line(xcentre+9.0, ycentre, xcentre+3.0, ycentre+1.3); Line(xcentre+9.0, ycentre, xcentre+3.0, ycentre-1.3); Line(xcentre, ycentre+9.0, xcentre-1.3, ycentre+3.0); Line(xcentre, ycentre+9.0, xcentre+1.3, ycentre+3.0); Line(xcentre-3.9, ycentre+3.9, xcentre-3.0, ycentre+1.3); Line(xcentre-3.9, ycentre+3.9, xcentre-1.3, ycentre+3.0); Line(xcentre+3.9, ycentre+3.9, xcentre+1.3, ycentre+3.0); Line(xcentre+3.9, ycentre+3.9, xcentre+3.0, ycentre+1.3); Line(xcentre-3.9, ycentre-3.9, xcentre-3.0, ycentre-1.3); Line(xcentre-3.9, ycentre-3.9, xcentre-1.3, ycentre-2.6); Line(xcentre+3.9, ycentre-3.9, xcentre+3.0, ycentre-1.3); Line(xcentre+3.9, ycentre-3.9, xcentre+1.3, ycentre-2.6); Line(xcentre-1.3, ycentre-2.6, xcentre, ycentre-27.0); Line(xcentre+1.3, ycentre-2.6, xcentre, ycentre-27.0); } //end suma //begin suma // draws the nadir symbol for lowest possible dive angle (i,e 90 degree dive angle) void HudLadder :: drawNadir(float xfirst, float xlast, float yvalue) { float xcentre = (xfirst + xlast)/2.0; float ycentre = yvalue; float r = 7.5; float x1,y1,x2,y2; // to draw a circle float xcent1, xcent2, ycent1, ycent2; xcent1 = xcentre + r * cos(0.0); ycent1 = ycentre + r * sin(0.0); for(int count=1; count<=400; count++) { float temp = count * 2 * 3.142 / 400.0; xcent2 = xcentre + r * cos(temp); ycent2 = ycentre + r * sin(temp); Line(xcent1, ycent1, xcent2, ycent2); xcent1 = xcent2; ycent1 = ycent2; } xcent2 = xcentre + r * cos(0.0); ycent2 = ycentre + r * sin(0.0); drawOneLine(xcent1, ycent1, xcent2, ycent2); //to connect last point to first point //end circle Line(xcentre, ycentre+7.5, xcentre, ycentre+22.5); //to draw a line above the circle Line(xcentre-7.5, ycentre, xcentre+7.5,ycentre); //line in the middle of circle float theta = asin (2.5/7.5); float theta1 = asin(5.0/7.5); x1 = xcentre + r * cos(theta); y1 = ycentre + 2.5; x2 = xcentre + r * cos((180.0 * SGD_DEGREES_TO_RADIANS) - theta); y2 = ycentre + 2.5; Line(x1,y1,x2,y2); x1 = xcentre + r * cos(theta1); y1 = ycentre + 5.0; x2 = xcentre + r * cos((180.0 * SGD_DEGREES_TO_RADIANS)-theta1); y2 = ycentre + 5.0; Line(x1,y1,x2,y2); x1 = xcentre + r * cos((180.0 * SGD_DEGREES_TO_RADIANS) +theta); y1 = ycentre - 2.5; x2 = xcentre + r * cos((360.0* SGD_DEGREES_TO_RADIANS)-theta); y2 = ycentre - 2.5; Line(x1,y1,x2,y2); x1 = xcentre + r * cos((180.0* SGD_DEGREES_TO_RADIANS) +theta1); y1 = ycentre - 5.0; x2 = xcentre + r * cos((360.0* SGD_DEGREES_TO_RADIANS)-theta1); y2 = ycentre - 5.0; Line(x1,y1,x2,y2); }