tema 4 ex 2 [GRAFICA]

#include <windows.h>
#include <math.h>
#include <stdlib.h>
#include <GL/freeglut.h>

const double TWO_PI = 6.2831853;

GLsizei winWidth = 700, winHeight = 700;
GLuint regHex;
static GLfloat rotTheta = 0.0;
double i = 0.0;
double j = 0.0;
double alpha = 0.5;
class scrPt
{
public:
    GLint x, y;
};

static void init(void)
{


    glClearColor(1.0, 1.0, 1.0, 0.0);
    glMatrixMode(GL_PROJECTION);
    glOrtho(-20.0, 780.0, 0.0, 600.0, -1.0, 1.0);

}


void deseneazaScena(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    // axa de rostogolire in afara transformarii



    scrPt hexVertex;
    GLdouble hexTheta;
    GLint k;

    glClear(GL_COLOR_BUFFER_BIT);

    glColor3f(0, 0, 0);
    glBegin(GL_LINES);
    glVertex2i(-30, 100);
    glVertex2i(780, 100);
    glEnd();

    glPushMatrix();
    glTranslated(i, 100.0, 0.0);
    glPushMatrix();
    glRotated(i, 0, 0, 1);
    glTranslated(-i, -100.0, 0.0);
    glColor3f(1.0, 0.0, 0.0);
    glBegin(GL_POLYGON);

    for (k = 0; k < 6; k++)
    {
        hexTheta = TWO_PI * k / 6;
        hexVertex.x = i + 50 * cos(hexTheta);
        hexVertex.y = 100 + 50 * sin(hexTheta);
        glVertex2i(hexVertex.x, hexVertex.y);
    }

    glEnd();
    glPopMatrix();



    glPopMatrix();

    glutSwapBuffers();
    glFlush();
}

void reshape(int w, int h)
{
    glViewport(0, 0, (GLsizei)w, (GLsizei)h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-20.0, 780.0, 0.0, 600.0, -1.0, 1.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

void miscad(void)
{
    i = i + alpha;
    if (i > 750.0)
        alpha = -0.5;
    else if (i < 0.0)
        alpha = 0.5;
    j = j + 1.0;

    glutPostRedisplay();
}

void miscas(void)
{
    i = i + alpha;
    if (i < 0.0)
        alpha = 0.5;
    else if (i > 750.0)
        alpha = -0.5;
    j = j + 1.0;

    glutPostRedisplay();
}
void mouse(int button, int state, int x, int y)
{
    switch (button) {
    case GLUT_LEFT_BUTTON:
        if (state == GLUT_DOWN)
            alpha = -1.0; glutIdleFunc(miscas);
        break;
    case GLUT_RIGHT_BUTTON:
        if (state == GLUT_DOWN)
            alpha = 1.0; glutIdleFunc(miscad);
        break;
    default:
        break;
    }
}


void main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowSize(800, 600);
    glutInitWindowPosition(100, 100);
    glutCreateWindow("Patrat care se rostogoleste");
    init();
    glutDisplayFunc(deseneazaScena);
    glutReshapeFunc(reshape);
    glutMouseFunc(mouse);
    glutMainLoop();
}