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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 = 0.5;
- 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:
- float x, y, radius, vx, vy;
- Circle(float cx, float cy, float vx, float vy, float r) : x(cx), y(cy), radius(r), vx(vx), vy(vy) {}
- void draw(){
- float step = 0.04;
- for (float f = 0; f <= M_PI * 2; f += step){
- draw_line(x + radius * cos(f), y + radius * sin(f), x + radius * cos(f+step), y + radius * sin(f+step));
- }
- }
- void draw_walls(double x1, double y1, double x2, double y2){
- draw_line(x1, y1, x2, y1);
- draw_line(x1, y1, x1, y2);
- draw_line(x2, y1, x2, y2);
- draw_line(x1, y2, x2, y2);
- }
- void update(){
- double x1 = -4;
- double y1 = -4;
- double x2 = 4;
- double y2 = 4;
- draw_walls(x1, y1, x2, y2);
- if (x >= x2 - radius || x <= x1 + radius)
- vx = -vx;
- if (y >= y2 - radius || y <= y1 + radius)
- vy = -vy;
- x += vx;
- y += vy;
- }
- };
- Circle c1(0, 0, 0.1, 0.1, 0.8);
- //Circle c2(0, 1, -0.2, -0.07, 0.5);
- static float TIME = 0.0;
- void Render() {
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- glLoadIdentity();
- glTranslatef(0, 0, -10);
- glColor3d(1, 1, 1);
- glScalef(scale, scale, scale);
- c1.draw();
- c1.update();
- //c2.draw();
- //c2.update();
- glFlush();
- }
- void update(int t) {
- Render();
- glutTimerFunc(50, 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, 0, 0.0);
- glutTimerFunc(50, update, 0);
- glutReshapeFunc(reshape);
- glutDisplayFunc(Render);
- glutKeyboardFunc(keyb);
- glutMainLoop();
- }
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