From: curt Date: Tue, 25 Nov 1997 19:25:27 +0000 (+0000) Subject: Changes to integrate Durk's moon/sun code updates + clean up. X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=b6f07f3058b3fd680df4419ea784c52eac5db467;p=simgear.git Changes to integrate Durk's moon/sun code updates + clean up. --- diff --git a/Scenery/moon.c b/Scenery/moon.c index 859563a5..56788d65 100644 --- a/Scenery/moon.c +++ b/Scenery/moon.c @@ -1,5 +1,6 @@ /************************************************************************** * moon.c + * Written by Durk Talsma. Started October 1997, for the flight gear project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as @@ -26,13 +27,123 @@ #include "orbits.h" #include "moon.h" +#include "../general.h" #include "../Main/views.h" #include "../Time/fg_time.h" -/* #include "../Aircraft/aircraft.h"*/ -#include "../general.h" +struct CelestialCoord + moonPos; + +float xMoon, yMoon, zMoon; + +/* +static GLfloat vdata[12][3] = +{ + {-X, 0.0, Z }, { X, 0.0, Z }, {-X, 0.0, -Z}, {X, 0.0, -Z }, + { 0.0, Z, X }, { 0.0, Z, -X}, {0.0, -Z, -X}, {0.0, -Z, -X}, + { Z, X, 0.0 }, { -Z, X, 0.0}, {Z, -X, 0.0 }, {-Z, -X, 0.0} +}; + +static GLuint tindices[20][3] = +{ + {0,4,1}, {0,9,4}, {9,5,4}, {4,5,8}, {4,8,1}, + {8,10,1}, {8,3,10}, {5,3,8}, {5,2,3}, {2,7,3}, + {7,10,3}, {7,6,10}, {7,11,6}, {11,0,6}, {0,1,6}, + {6,1,10}, {9,0,11}, {9,11,2}, {9,2,5}, {7,2,11} +};*/ + +GLint moon; + +/* ------------------------------------------------------------- + This section contains the code that generates a yellow + Icosahedron. It's under development... (of Course) +______________________________________________________________*/ +/* +void NormalizeVector(float v[3]) +{ + GLfloat d = sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]); + if (d == 0.0) + { + printf("zero length vector\n"); + return; + } + v[0] /= d; + v[1] /= d; + v[2] /= d; +} + +void drawTriangle(float *v1, float *v2, float *v3) +{ + glBegin(GL_POLYGON); + //glBegin(GL_POINTS); + glNormal3fv(v1); + glVertex3fv(v1); + glNormal3fv(v2); + glVertex3fv(v2); + glNormal3fv(v3); + glVertex3fv(v3); + glEnd(); +} -static GLint moon; +void subdivide(float *v1, float *v2, float *v3, long depth) +{ + GLfloat v12[3], v23[3], v31[3]; + GLint i; + + if (!depth) + { + drawTriangle(v1, v2, v3); + return; + } + for (i = 0; i < 3; i++) + { + v12[i] = (v1[i] + v2[i]); + v23[i] = (v2[i] + v3[i]); + v31[i] = (v3[i] + v1[i]); + } + NormalizeVector(v12); + NormalizeVector(v23); + NormalizeVector(v31); + subdivide(v1, v12, v31, depth - 1); + subdivide(v2, v23, v12, depth - 1); + subdivide(v3, v31, v23, depth - 1); + subdivide(v12, v23, v31,depth - 1); + +} */ +/* +void display(void) +{ + int i; + glClear(GL_COLOR_BUFFER_BIT); + glPushMatrix(); + glRotatef(spin, 0.0, 0.0, 0.0); + glColor3f(1.0, 1.0, 0.0); +// glBegin(GL_LINE_LOOP); + for (i = 0; i < 20; i++) + { + + //glVertex3fv(&vdata[tindices[i][0]][0]); + //glVertex3fv(&vdata[tindices[i][1]][0]); + //glVertex3fv(&vdata[tindices[i][2]][0]); + + subdivide(&vdata[tindices[i][0]][0], + &vdata[tindices[i][1]][0], + &vdata[tindices[i][2]][0], 3); + + + } +// glEnd(); + // glFlush(); + glPopMatrix(); + glutSwapBuffers(); +} */ + +/* -------------------------------------------------------------- + + This section contains the code that calculates the actual + position of the moon in the night sky. + +----------------------------------------------------------------*/ struct CelestialCoord fgCalculateMoon(struct OrbElements params, struct OrbElements sunParams, @@ -42,7 +153,7 @@ struct CelestialCoord fgCalculateMoon(struct OrbElements params, result; double - eccAnom, ecl, lonecl, latecl, actTime, + eccAnom, ecl, lonecl, latecl, actTime, xv, yv, v, r, xh, yh, zh, xg, yg, zg, xe, ye, ze, Ls, Lm, D, F; @@ -54,7 +165,7 @@ struct CelestialCoord fgCalculateMoon(struct OrbElements params, eccAnom = fgCalcEccAnom(params.M, params.e); /* calculate the moon's distance (d) and true anomaly (v) */ - xv = params.a * ( cos(eccAnom) - params.e); + xv = params.a * ( cos(eccAnom) - params.e); yv = params.a * ( sqrt(1.0 - params.e*params.e) * sin(eccAnom)); v =atan2(yv, xv); r = sqrt(xv*xv + yv*yv); @@ -75,7 +186,7 @@ struct CelestialCoord fgCalculateMoon(struct OrbElements params, F = Lm - params.N; lonecl += fgDegToRad( - - 1.274 * sin (params.M - 2*D) // the Evection + - 1.274 * sin (params.M - 2*D) // the Evection + 0.658 * sin (2 * D) // the Variation - 0.186 * sin (sunParams.M) // the yearly variation - 0.059 * sin (2*params.M - 2*D) @@ -97,9 +208,10 @@ struct CelestialCoord fgCalculateMoon(struct OrbElements params, ); /* Yep */ r += ( - - 0.58 * cos(params.M - 2*D) + - 0.58 * cos(params.M - 2*D) - 0.46 * cos(2*D) - ); + ); /* Ok! */ + xg = r * cos(lonecl) * cos(latecl); yg = r * sin(lonecl) * cos(latecl); zg = r * sin(latecl); @@ -108,67 +220,63 @@ struct CelestialCoord fgCalculateMoon(struct OrbElements params, ye = yg * cos(ecl) - zg * sin(ecl); ze = yg * sin(ecl) + zg * cos(ecl); - result.RightAscension = atan2(ye, xe); + result.RightAscension = atan2(ye, xe); result.Declination = atan2(ze, sqrt(xe*xe + ye*ye)); - return result; } void fgMoonInit() { - struct CelestialCoord - moonPos; +// int i; +// moon = glGenLists(1); +// glNewList(moon, GL_COMPILE ); - moon = glGenLists(1); - glNewList(moon, GL_COMPILE ); - glBegin( GL_POINTS ); + fgSolarSystemUpdate(&(pltOrbElements[1]), cur_time_params); moonPos = fgCalculateMoon(pltOrbElements[1], pltOrbElements[0], cur_time_params); + #ifdef DEBUG printf("Moon found at %f (ra), %f (dec)\n", moonPos.RightAscension, moonPos.Declination); - /* give the moon a temporary color, for testing purposes */ - glColor3f( 0.0, 1.0, 0.0); - glVertex3f( 190000.0 * cos(moonPos.RightAscension) * cos(moonPos.Declination), - 190000.0 * sin(moonPos.RightAscension) * cos(moonPos.Declination), - 190000.0 * sin(moonPos.Declination) ); - glEnd(); - glEndList(); -} + #endif + glColor3f(1.0, 1.0, 0.0); -void fgMoonRender() -{ - double angle; - static double warp = 0; - struct VIEW *v; - struct fgTIME *t; - - t = &cur_time_params; - v = ¤t_view; - - - glDisable( GL_FOG ); - glDisable( GL_LIGHTING ); - glPushMatrix(); - glTranslatef( v->view_pos.x, v->view_pos.y, v->view_pos.z ); - angle = t->gst * 15.0; /* 15 degrees per hour rotation */ - /* warp += 1.0; */ - /* warp = 15.0; */ - warp = 0.0; - glRotatef( (angle+warp), 0.0, 0.0, -1.0 ); - printf("Rotating moon by %.2f degrees + %.2f degrees\n",angle,warp); - - glCallList(moon); - - glPopMatrix(); - glEnable( GL_LIGHTING ); - glEnable( GL_FOG ); + /* xMoon = 90000.0 * cos(moonPos.RightAscension) * cos(moonPos.Declination); + yMoon = 90000.0 * sin(moonPos.RightAscension) * cos(moonPos.Declination); + zMoon = 90000.0 * sin(moonPos.Declination); */ + + xMoon = 60000.0 * cos(moonPos.RightAscension) * cos(moonPos.Declination); + yMoon = 60000.0 * sin(moonPos.RightAscension) * cos(moonPos.Declination); + zMoon = 60000.0 * sin(moonPos.Declination); + +// glPushMatrix(); +// glBegin(GL_TRIANGLES); + /* + for (i = 0; i < 20; i++) + subdivide(&vdata[tindices[i][0]][0], + &vdata[tindices[i][1]][0], + &vdata[tindices[i][2]][0], 3);*/ +// glutSolidSphere(1.0, 25, 25); + +// glEnd(); +// glPopMatrix(); +// glEndList(); } -/* $Log$ -/* Revision 1.2 1997/10/28 21:00:21 curt -/* Changing to new terrain format. -/* - * Revision 1.1 1997/10/25 03:16:08 curt - * Initial revision of code contributed by Durk Talsma. - * - */ +/* Draw the moon */ +void fgMoonRender() { + GLfloat color[4] = { 1.0, 1.0, 1.0, 1.0 }; + + /* set lighting parameters */ + glLightfv(GL_LIGHT0, GL_AMBIENT, color ); + glLightfv(GL_LIGHT0, GL_DIFFUSE, color ); + glMaterialfv(GL_FRONT, GL_AMBIENT, fgClearColor); + glMaterialfv(GL_FRONT, GL_DIFFUSE, color); + + glPushMatrix(); + glTranslatef(xMoon, yMoon, zMoon); + glScalef(1400, 1400, 1400); + /* glutSolidSphere(1.0, 25, 25); */ + glutSolidSphere(1.0, 15, 15); + glPopMatrix(); +} + diff --git a/Scenery/moon.h b/Scenery/moon.h index b23ae4e3..8c0ae98b 100644 --- a/Scenery/moon.h +++ b/Scenery/moon.h @@ -29,6 +29,10 @@ #include "orbits.h" #include "../Time/fg_time.h" +#include + +#define X .525731112119133606 +#define Z .850650808352039932 /* Initialize the Moon Display management Subsystem */ @@ -42,15 +46,18 @@ struct CelestialCoord fgCalculateMoon(struct OrbElements Params, struct fgTIME t); extern struct OrbElements pltOrbElements[9]; - +extern GLfloat fgClearColor[4]; #endif /* _MOON_H_ */ /* $Log$ -/* Revision 1.2 1997/10/25 03:24:23 curt -/* Incorporated sun, moon, and star positioning code contributed by Durk Talsma. +/* Revision 1.3 1997/11/25 19:25:35 curt +/* Changes to integrate Durk's moon/sun code updates + clean up. /* + * Revision 1.2 1997/10/25 03:24:23 curt + * Incorporated sun, moon, and star positioning code contributed by Durk Talsma. + * * Revision 1.1 1997/10/25 03:16:09 curt * Initial revision of code contributed by Durk Talsma. * diff --git a/Scenery/orbits.c b/Scenery/orbits.c index 9440b756..c2618561 100644 --- a/Scenery/orbits.c +++ b/Scenery/orbits.c @@ -43,17 +43,21 @@ double fgCalcActTime(struct fgTIME t) /* a hack. This one introduces the 2000 problem into the program */ year = t.gmt->tm_year + 1900; - /* calculate the actual time */ + /* calculate the actual time, rember to add 1 to tm_mon! */ actTime = 367 * year - 7 * - (year + (t.gmt->tm_mon + 9) / 12) / 4 + 275 * - t.gmt->tm_mon / 9 + t.gmt->tm_mday - 730530; + (year + ((t.gmt->tm_mon+1) + 9) / 12) / 4 + 275 * + (t.gmt->tm_mon+1) / 9 + t.gmt->tm_mday - 730530; UT = t.gmt->tm_hour + ((double) t.gmt->tm_min / 60); /*printf("UT = %f\n", UT); */ actTime += (UT / 24.0); + #define DEBUG 1 + #ifdef DEBUG + printf("Actual Time:\n"); printf("current day = %f\t", actTime); printf("GMT = %d, %d, %d, %d, %d, %d\n", year, t.gmt->tm_mon, t.gmt->tm_mday, t.gmt->tm_hour, t.gmt->tm_min, t.gmt->tm_sec); + #endif return actTime; } @@ -132,7 +136,9 @@ void fgSolarSystemInit(struct fgTIME t) printf("Cannot open data file: '%s'\n", path); return; } + #ifdef DEBUG printf("reading datafile %s", path); + #endif /* for all the objects... */ for (i = 0; i < 9; i ++) @@ -164,7 +170,10 @@ void fgSolarSystemUpdate(struct OrbElements *planet, struct fgTIME t) /* $Log$ -/* Revision 1.1 1997/10/25 03:16:10 curt -/* Initial revision of code contributed by Durk Talsma. +/* Revision 1.2 1997/11/25 19:25:36 curt +/* Changes to integrate Durk's moon/sun code updates + clean up. /* + * Revision 1.1 1997/10/25 03:16:10 curt + * Initial revision of code contributed by Durk Talsma. + * */ diff --git a/Scenery/sun.c b/Scenery/sun.c index 6f1a213f..92e022f6 100644 --- a/Scenery/sun.c +++ b/Scenery/sun.c @@ -22,9 +22,18 @@ * (Log is kept at end of this file) **************************************************************************/ - +#include #include "../Time/fg_time.h" +#include "../Main/views.h" #include "orbits.h" +#include "sun.h" + +GLint sun; + +static struct CelestialCoord + sunPos; + +float xSun, ySun, zSun; struct SunPos fgCalcSunPos(struct OrbElements params) { @@ -38,24 +47,157 @@ struct SunPos fgCalcSunPos(struct OrbElements params) EccAnom = fgCalcEccAnom(params.M, params.e); /* calculate the Suns distance (r) and its true anomaly (v) */ - xv = cos(EccAnom) - params.e; + xv = cos(EccAnom) - params.e; yv = sqrt(1.0 - params.e*params.e) * sin(EccAnom); v = atan2(yv, xv); r = sqrt(xv*xv + yv*yv); - /* calculate the the Suns true longitude (lonsun) */ + /* calculate the the Sun's true longitude (lonsun) */ lonSun = v + params.w; /* convert true longitude and distance to ecliptic rectangular geocentric - coordinates (xs, ys) */ + coordinates (xs, ys) */ solarPosition.xs = r * cos(lonSun); solarPosition.ys = r * sin(lonSun); return solarPosition; } +struct CelestialCoord fgCalculateSun(struct OrbElements params, struct fgTIME t) +{ + struct CelestialCoord + result; + struct SunPos + SolarPosition; + double + xe, ye, ze, ecl, actTime; + + /* calculate the angle between ecliptic and equatorial coordinate system */ + actTime = fgCalcActTime(t); + ecl = fgDegToRad(23.4393 - 3.563E-7 * actTime); // Angle now in Rads + + /* calculate the sun's ecliptic position */ + SolarPosition = fgCalcSunPos(params); + + /* convert ecliptic coordinates to equatorial rectangular geocentric coordinates */ + xe = SolarPosition.xs; + ye = SolarPosition.ys * cos(ecl); + ze = SolarPosition.ys * sin(ecl); + + /* and finally... Calulate Right Ascention and Declination */ + result.RightAscension = atan2( ye, xe); + result.Declination = atan2(ze, sqrt(xe*xe + ye*ye)); + return result; +} + + +/* Initialize the Sun */ +void fgSunInit() +{ +// int i; +// sun = glGenLists(1); +// glNewList(sun, GL_COMPILE ); +// glBegin( GL_POINTS ); + fgSolarSystemUpdate(&(pltOrbElements[0]), cur_time_params); + sunPos = fgCalculateSun(pltOrbElements[0], cur_time_params); + #ifdef DEBUG + printf("Sun found at %f (ra), %f (dec)\n", sunPos.RightAscension, sunPos.Declination); + #endif + /* give the moon a temporary color, for testing purposes */ +// glColor3f( 0.0, 1.0, 0.0); +// glVertex3f( 190000.0 * cos(moonPos.RightAscension) * cos(moonPos.Declination), + // 190000.0 * sin(moonPos.RightAscension) * cos(moonPos.Declination), +// 190000.0 * sin(moonPos.Declination) ); + //glVertex3f(0.0, 0.0, 0.0); +// glEnd(); +// glColor3f(1.0, 1.0, 1.0); + //xMoon = 190000.0 * cos(moonPos.RightAscension) * cos(moonPos.Declination); + //yMoon = 190000.0 * sin(moonPos.RightAscension) * cos(moonPos.Declination); + //zMoon = 190000.0 * sin(moonPos.Declination); + xSun = 60000.0 * cos(sunPos.RightAscension) * cos(sunPos.Declination); + ySun = 60000.0 * sin(sunPos.RightAscension) * cos(sunPos.Declination); + zSun = 60000.0 * sin(sunPos.Declination); + +// glPushMatrix(); +// glTranslatef(x, y, z); +// glScalef(16622.8, 16622.8, 16622.8); +// glBegin(GL_TRIANGLES); +// for (i = 0; i < 20; i++) +// subdivide(&vdata[tindices[i][0]][0], +// &vdata[tindices[i][1]][0], +// &vdata[tindices[i][2]][0], 3); +// glutSolidSphere(1.0, 25, 25); + +// glEnd(); + //glPopMatrix(); +// glEndList(); +} + + +/* Draw the Sun */ +void fgSunRender() { + struct VIEW *v; + struct fgTIME *t; + GLfloat color[4] = { 0.85, 0.65, 0.05, 1.0 }; + /* double x_2, x_4, x_8, x_10; */ + /* GLfloat ambient; */ + /* GLfloat amb[3], diff[3]; */ + + + t = &cur_time_params; + v = ¤t_view; + + /* x_2 = t->sun_angle * t->sun_angle; + x_4 = x_2 * x_2; + x_8 = x_4 * x_4; + x_10 = x_8 * x_2; */ + + /* ambient = (0.4 * pow(1.1, -x_10 / 30.0)); + if ( ambient < 0.3 ) ambient = 0.3; + if ( ambient > 1.0 ) ambient = 1.0; + amb[0] = 0.50 + ((ambient * 6.66) - 1.6); + amb[1] = 0.00 + ((ambient * 6.66) - 1.6); + amb[2] = 0.00 + ((ambient * 6.66) - 1.6); + amb[3] = 0.00; +#ifdef DEBUG + printf("Color of the sun: %f, %f, %f\n" + "Ambient value : %f\n" + "Sun Angle : %f\n" , amb[0], amb[1], amb[2], ambient, t->sun_angle); +#endif + diff[0] = 0.0; + diff[1] = 0.0; + diff[2] = 0.0; + diff[3] = 0.0; */ + + /* set lighting parameters */ + /* glLightfv(GL_LIGHT0, GL_AMBIENT, color ); + glLightfv(GL_LIGHT0, GL_DIFFUSE, color ); + glMaterialfv(GL_FRONT, GL_AMBIENT, amb); + glMaterialfv(GL_FRONT, GL_DIFFUSE, diff); */ + + glDisable( GL_LIGHTING ); + glPushMatrix(); + glTranslatef(xSun, ySun, zSun); + glScalef(1400, 1400, 1400); + glColor3fv( color ); + /* glutSolidSphere(1.0, 25, 25); */ + glutSolidSphere(1.0, 10, 10); + //glCallList(sun); + glPopMatrix(); + glEnable( GL_LIGHTING ); +} + + /* $Log$ -/* Revision 1.1 1997/10/25 03:16:11 curt -/* Initial revision of code contributed by Durk Talsma. +/* Revision 1.2 1997/11/25 19:25:39 curt +/* Changes to integrate Durk's moon/sun code updates + clean up. /* + * Revision 1.1 1997/10/25 03:16:11 curt + * Initial revision of code contributed by Durk Talsma. + * */ + + + + + diff --git a/Scenery/sun.h b/Scenery/sun.h index 5082a67c..fe06244f 100644 --- a/Scenery/sun.h +++ b/Scenery/sun.h @@ -28,13 +28,24 @@ struct SunPos fgCalcSunPos(struct OrbElements sunParams); +extern struct OrbElements pltOrbElements[9]; +extern GLfloat fgClearColor[4]; + +/* Initialize the Sun */ +void fgSunInit(); + +/* Draw the Sun */ +void fgSunRender(); #endif /* SUN_H */ /* $Log$ -/* Revision 1.1 1997/10/25 03:16:12 curt -/* Initial revision of code contributed by Durk Talsma. +/* Revision 1.2 1997/11/25 19:25:39 curt +/* Changes to integrate Durk's moon/sun code updates + clean up. /* + * Revision 1.1 1997/10/25 03:16:12 curt + * Initial revision of code contributed by Durk Talsma. + * */