tema 4 ex 1 [GRAFICA]

#include<windows.h>
#include <gl/freeglut.h>


double i = 0.0;
double j = 0.0;
double alpha = 0.5;
double alpha2 = 1;

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);

    glLineWidth(6.0);
    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

    // CENTRUL DE GREUTATE
    glColor3f(0, 0, 0);
    glPointSize(10);
    glEnable(GL_POINT_SMOOTH);
    glBegin(GL_POINTS);
    glVertex2f(300, 200);
    glEnd();

    // APLICAREA TRANSFORMARII ASUPRA TRIUNGHIULUI

    glPushMatrix();
    glTranslated(300, 200, 0);
    glScaled(j, j, j);
    glRotated(i, 0, 0, 1);
    glTranslated(-300, -200, 0);
    glBegin(GL_TRIANGLES);
    glColor3f(0, 0, 1);
    glVertex2f(100, 100);
    glColor3f(0, 1, 0);
    glVertex2f(500, 100);
    glColor3f(1, 0, 0);
    glVertex2f(300, 400);
    glEnd();
    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 + alpha2;
    if (j > 1)
        alpha2 = -0.3;
    else if (j < 0.1)
        alpha2 = 0.3;

    glutPostRedisplay();
}

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

    j = j + alpha2;
    if (j > 1)
        alpha2 = -0.3;
    else if (j < 0.1)
        alpha2 = 0.3;

    glutPostRedisplay();
}

void mouse(int button, int state, int x, int y)
{
    switch (button) {
    case GLUT_LEFT_BUTTON:
        if (state == GLUT_DOWN)
            alpha = -0.5; glutIdleFunc(miscas);
        break;
    case GLUT_RIGHT_BUTTON:
        if (state == GLUT_DOWN)
            alpha = 0.5; 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("Triunghi rotitor scalat");
    init();
    glutDisplayFunc(deseneazaScena);
    glutReshapeFunc(reshape);
    glutMouseFunc(mouse);
    glutMainLoop();
}