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- #include <iostream>
- #include <list>
- #include<cmath>
- #include <algorithm>
- #include <GL/glut.h>
- #include <GL/gl.h>
- #include <GL/glu.h>
- using namespace std;
- double scale = 1.0;
- double vx=0,vy=0;
- double p=3.14,r_1=0;
- double kx=5,ky=5;
- int msec = 20;
- void render_square(double x, double y) {
- glPushMatrix();
- double dx = 0.5;
- double dy = 0.5;
- glBegin(GL_POLYGON);
- glVertex2f(x, y);
- glVertex2f(x + dx, y);
- glVertex2f(x + dx, y - dy);
- glVertex2f(x, y - dy);
- glEnd();
- glPopMatrix();
- }
- void draw_line(double x, double y, double x1, double y1) {
- glBegin(GL_LINES);
- glVertex2d(x, y);
- glVertex2d(x1, y1);
- glEnd();
- }
- class circle{
- public:
- double x,y,r,vx,vy;
- circle(double x_, double y_, double r_, double vx_, double vy_):r(r_), x(x_), y(y_){
- vx = vx_ / 1000.0 * msec;
- vy = vy_ / 1000.0 * msec;
- }
- void print_circle(){
- int n=41;
- double cx=x + r;
- double cy=y;
- double step = p/n;
- for (float f=step; f<=p*2;f+=step){
- draw_line(cx ,cy ,cos(f)*r+x ,sin(f)*r+y);
- cx=x + cos(f)*r;
- cy=y + sin(f)*r;
- }
- }
- void update(){
- if(x+r>kx || x-r<-kx){
- vx*=-1;
- }
- if(y+r>ky || y-r<-ky){
- vx*=-1;
- }
- x+=vx;
- y+=vy;
- }
- };
- circle a(0, 0, 0.4, 1, 0);
- void Render() {
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- glLoadIdentity();
- glTranslatef(0, 0, -10);
- glColor3d(1, 1, 1);
- glScalef(scale, scale, scale);
- a.print_circle();
- draw_line(-5,-5,5,-5);
- draw_line(5,-5,5,5);
- draw_line(-5,5,-5,5);
- draw_line(-5,5,-5,-5);
- a.update();
- glFlush();
- }
- void update(int t) {
- Render();
- glutTimerFunc(msec, update, 0);
- }
- void keyb(unsigned char key, int x, int y) {
- if(key == '+') {
- scale *= 1.1;
- }
- if(key == '-') {
- scale *= 0.9;
- }
- Render();
- }
- void reshape(int w, int h) {
- // предупредим деление на ноль
- // если окно сильно перетянуто будет
- if(h == 0)
- h = 1;
- float ratio = 1.0* w / h;
- // используем матрицу проекции
- glMatrixMode(GL_PROJECTION);
- // Reset матрицы
- glLoadIdentity();
- // определяем окно просмотра
- glViewport(0, 0, w, h);
- // установить корректную перспективу.
- gluPerspective(45,ratio,1,1000);
- // вернуться к модели
- glMatrixMode(GL_MODELVIEW);
- }
- int main(int argc, char **argv)
- {
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
- glutInitWindowSize(800, 600);
- glutCreateWindow("Physics Engine");
- glEnable(GL_DEPTH_TEST);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- glClearColor(0., 0.0, 128.0, 0.0);
- glutTimerFunc(50, update, 0);
- glutReshapeFunc(reshape);
- glutDisplayFunc(Render);
- glutKeyboardFunc(keyb);
- glutMainLoop();
- }
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