380 lines
8.9 KiB
C
380 lines
8.9 KiB
C
#include "types.h"
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#include <GL/glut.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include <math.h>
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#include <limits.h>
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#include <unistd.h>
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#include <stdio.h>
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#define filename __FILE__
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#define XY_WIRE_COUNT 10.0f
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#define ROT_FACTOR_PLANET_SUN (360.0 / yearabs)
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#define ROT_FACTOR_PLANET (360.0 / 1.0)
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#define ROT_FACTOR_MOON (360.0 / dayabs)
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#define SYSTEM_POS_Z -15.0f
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#define SYSTEM_POS_Z_BACK 15.0f
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int year;
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int yearabs = 365;
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int day;
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int dayabs = 30;
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HE_obj *obj;
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/*
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* static function declaration
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*/
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static void draw_Sun(void);
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static void draw_Planet_1(void);
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static void draw_Planet_2(void);
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/**
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* Draws a sun which changes its color randomly.
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*/
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static void draw_Sun(void)
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{
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glPushMatrix();
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/* pull into middle of universe */
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glTranslatef(-obj->faces->edge->vert->x,
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-obj->faces->edge->vert->y,
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-obj->faces->edge->vert->z + SYSTEM_POS_Z);
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glBegin(GL_POLYGON);
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glColor3f(0.0f, 1.0f, 0.0f);
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for (uint32_t i = 0; i < obj->fc; i++) { /* for all faces */
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HE_edge *tmp_edge = obj->faces[i].edge;
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do { /* for all edges of the face */
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glVertex3f(tmp_edge->vert->x,
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tmp_edge->vert->y,
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tmp_edge->vert->z);
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} while ((tmp_edge = tmp_edge->next) != obj->faces[i].edge);
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}
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glEnd();
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glPopMatrix();
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}
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/**
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* Draws a planet with some Saturn like rings, two moons and an axis.
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* Rotates the planet around the sun, the moons around the planet
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* and the planet around its axis.
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*/
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static void draw_Planet_1(void)
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{
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GLUquadric* quadric = NULL;
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quadric = gluNewQuadric();
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const int rot_fac_day = 15;
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glPushMatrix();
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//Rotate around the sun
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
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glRotatef(90, 1.0f, 0.0f, 0.0f);
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glRotatef((ROT_FACTOR_PLANET_SUN * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(0.0f, 4.0f, 0.0f);
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glRotatef((ROT_FACTOR_PLANET_SUN * day), 0.0f, 0.0f, -1.0f);
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glRotatef(315, 0.0f, 1.0f, 0.0f);
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glColor3f(1.0f, 0.0f, 0.0f);
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//A rotation (full 360°) once a day is much too fast you woulden'd see a thing
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glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, 1.0f);
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glutWireSphere(1.0f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, -1.0f);
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//Center axis
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glPushMatrix();
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glLineWidth(3);
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glColor3f(1.0, 1.0, 1.0);
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glBegin(GL_LINE_LOOP);
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glVertex3f(0, 0, -5);
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glVertex3f(0, 0, 5);
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glEnd();
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glPopMatrix();
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//circle1
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glPushMatrix();
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glColor3f(0.8f, 0.0f, 0.2f);
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//glRotatef(90, 0.0f, 1.0f, 0.0f); //"senkrecht zur Planetenachse"
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gluDisk(quadric, 1.2f, 1.3f, 32, 1);
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glPopMatrix();
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//circle2
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glPushMatrix();
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glColor3f(0.0f, 1.0f, 0.0f);
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//glRotatef(90, 0.0f, 1.0f, 0.0f); //"senkrecht zur Planetenachse"
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gluDisk(quadric, 1.4f, 1.7f, 32, 1);
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glPopMatrix();
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//Moon1
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glPushMatrix();
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glColor3f(0.0f, 0.0f, 1.0f);
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//glRotatef((ROT_FACTOR_MOON * day), 1.0f, 0.0f, 0.0f); //"senkrecht zur Planetenachse"
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glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(0.0f, 2.0f, 0.0f);
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glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glPopMatrix();
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//Moon2
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glPushMatrix();
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glColor3f(0.0f, 1.0f, 1.0f);
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//glRotatef((ROT_FACTOR_MOON * day), 1.0f, 0.0f, 0.0f); //"senkrecht zur Planetenachse"
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glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(0.0f, -2.0f, 0.0f);
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glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glPopMatrix();
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glPopMatrix();
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}
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/**
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* Draws a Planet with three moons.
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* The planet rotates around the sun and the moons around the planet
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* and the planet around its axis.
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*/
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static void draw_Planet_2(void)
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{
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glPushMatrix();
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const float moon_pos_fac = 2.5;
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//Rotate around the sun
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
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glRotatef(90, 1.0f, 0.0f, 0.0f);
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glRotatef((ROT_FACTOR_PLANET_SUN * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(-2.0f, -8.0f, 0.0f);
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glColor3f(0.0f, 0.0f, 1.0f);
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//A rotation (full 360°) once a day is much too fast you woulden'd see a thing
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const int rot_fac_day = 15;
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glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, 1.0f);
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glutWireSphere(1.3f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, -1.0f);
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//Moon3
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glPushMatrix();
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glColor3f(1.0f, 1.0f, 1.0f);
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glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(cos(0 * (M_PI / 180)) * moon_pos_fac,
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sin(0 * (M_PI / 180)) * moon_pos_fac, 0.0f);
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glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glPopMatrix();
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//Moon4
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glPushMatrix();
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glColor3f(1.0f, 0.0f, 1.0f);
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glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(cos(120 * (M_PI / 180)) * moon_pos_fac,
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sin(120 * (M_PI / 180)) * moon_pos_fac, 0.0f);
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glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glPopMatrix();
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//Moon5
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glPushMatrix();
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glColor3f(1.0f, 0.0f, 0.0f);
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glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(cos(240 * (M_PI / 180)) * moon_pos_fac,
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sin(240 * (M_PI / 180)) * moon_pos_fac, 0.0f);
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glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glPopMatrix();
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glPopMatrix();
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}
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/**
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* Displays the whole setup with the sun, planet one, planet two and the frame rate
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*/
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void display(void)
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{
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glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
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glMatrixMode(GL_MODELVIEW);
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draw_Sun();
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draw_Planet_1();
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draw_Planet_2();
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glMatrixMode(GL_PROJECTION);
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glPushMatrix();
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glLoadIdentity();
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gluOrtho2D(0.0, 500, 0.0, 500);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glLoadIdentity();
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glColor3f(1.0f, 1.0f, 1.0f);
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glRasterPos2i(5, 10);
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glMatrixMode(GL_MODELVIEW);
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glPopMatrix();
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glMatrixMode(GL_PROJECTION);
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glPopMatrix();
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glEnable(GL_TEXTURE_2D);
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glutSwapBuffers();
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}
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/**
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* Sets the initial values to start the program.
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*/
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void init(HE_obj *myobj)
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{
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obj = myobj;
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day = 0;
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year = 0;
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glClearColor(0.0, 0.0, 0.0, 0.0);
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glEnable(GL_DEPTH_TEST);
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glShadeModel(GL_FLAT);
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}
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/**
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* Is called when the window size changes.
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* Fits the viewport to the new dimension.
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*
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* @param w the new width of the window
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* @param h the new height of the window
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*/
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void reshape(GLsizei w, GLsizei h)
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{
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(60.0, (GLfloat) w / (GLfloat) h, 1.0, 30.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -5.0);
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}
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/**
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* Is called over and over again.
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* Counts the years and days.
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*/
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void animate()
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{
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day++;
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if (day >= yearabs) {
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day = 0;
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year++;
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}
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if (year >= (INT_MAX - 1000) || year < 0) {
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year = 0;
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}
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if (day < 0) {
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day = 0;
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}
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/* cout << day << endl; */
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usleep(30000); // some very basic VScny to see the movement better
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glutPostRedisplay();
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}
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/**
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* Keyboard callback function,
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*
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* press t to increase the day
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* press T to decrease the day
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* press j to increase the year
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* press J to decrease the year
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* press x to rotate the whole scene in x direction
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* press X to rotate the whole scene in -x direction
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* press y to rotate the whole scene in y direction
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* press Y to rotate the whole scene in -y direction
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* press c to rotate the whole scene in z direction
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* press C to rotate the whole scene in -z direction
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* press w to translate the whole scene in y direction
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* press s to translate the whole scene in -y direction
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* press a to translate the whole scene in -x direction
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* press d to translate the whole scene in x direction
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* press q to translate the whole scene in z direction
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* press e to translate the whole scene in -z direction
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*
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* @param key which was pressed
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* @param x coordinate
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* @param y coordinate
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*/
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void keyboard(unsigned char key, int x, int y)
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{
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switch (key) {
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case 't':
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dayabs += 15;
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glutPostRedisplay();
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break;
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case 'j':
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yearabs += 50;
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glutPostRedisplay();
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break;
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case 'T':
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dayabs -= 15;
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glutPostRedisplay();
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break;
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case 'J':
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yearabs -= 50;
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glutPostRedisplay();
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break;
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case 'x':
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
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glRotatef(1, 1.0f, 0.0f, 0.0f);
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z_BACK);
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glutPostRedisplay();
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break;
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case 'y':
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
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glRotatef(1, 0.0f, 1.0f, 0.0f);
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z_BACK);
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glutPostRedisplay();
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break;
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case 'c':
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
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glRotatef(1, 0.0f, 0.0f, 1.0f);
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z_BACK);
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glutPostRedisplay();
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break;
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case 'X':
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
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glRotatef(1, -1.0f, 0.0f, 0.0f);
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z_BACK);
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glutPostRedisplay();
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break;
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case 'Y':
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
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glRotatef(1, 0.0f, -1.0f, 0.0f);
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z_BACK);
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glutPostRedisplay();
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break;
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case 'C':
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
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glRotatef(1, 0.0f, 0.0f, -1.0f);
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z_BACK);
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glutPostRedisplay();
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break;
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case 'w':
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glTranslatef(0.0f, 1.0f, 0.0f);
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break;
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case 'a':
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glTranslatef(-1.0f, 0.0f, 0.0f);
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break;
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case 's':
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glTranslatef(0.0f, -1.0f, 0.0f);
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break;
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case 'd':
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glTranslatef(1.0f, 0.0f, 0.0f);
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break;
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case 'q':
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glTranslatef(0.0f, 0.0f, 1.0f);
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break;
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case 'e':
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glTranslatef(0.0f, 0.0f, -1.0f);
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break;
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}
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}
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