tema 3.1 [grafica]

/*Hearn & Baker */
#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;

class scrPt
{
public:
    GLint x, y;
};

static void init(void)
{
    scrPt hexVertex;
    GLdouble hexTheta;
    GLint k;

    glClearColor(1.0, 1.0, 1.0, 1.0);

    regHex = glGenLists(2);

    glNewList(regHex, GL_COMPILE);

        glColor3f(0.0, 1.0, 0.0);
        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

        glBegin(GL_POLYGON);
        for (k = 0; k < 100; k++)
        {
            hexTheta = TWO_PI * k / 100;
            hexVertex.x = 150 + 100 * cos(hexTheta);
            hexVertex.y = 150 + 100 * sin(hexTheta);
            glVertex2i(hexVertex.x, hexVertex.y);
        }
        glEnd();

    glEndList();


    glNewList(regHex + 1, GL_COMPILE);
        glColor3f(0.0, 0.0, 1.0);
        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

        glBegin(GL_POLYGON);

        for (k = 0; k < 100; k++)
        {
            hexTheta = TWO_PI * k / 100;
            hexVertex.x = 150 + 130 * cos(hexTheta);
            hexVertex.y = -150 + 130 * sin(hexTheta);
            glVertex2i(hexVertex.x, hexVertex.y);
        }
        glEnd();

    glEndList();
}

void displayHex(void)
{
    glClear(GL_COLOR_BUFFER_BIT);


    glColor3f(1.0, 0.0, 0.0);
    glBegin(GL_LINES);
    glVertex2i(150, 150);
    glVertex2i(250, 150);
    glEnd();

    glBegin(GL_LINES);
    glVertex2i(150, -150);
    glVertex2i(280, -150);
    glEnd();

    glRasterPos2i(152, 152);
    glColor3f(0.0f, 0.0f, 1.0f);
    glutBitmapString(GLUT_BITMAP_HELVETICA_18, (const unsigned char*)"(raza = 100)");

    glRasterPos2i(152, -148);
    glColor3f(0.0, 0.0, 0.0);
    glutBitmapString(GLUT_BITMAP_HELVETICA_18, (const unsigned char*)"(raza = 130)");

    glCallList(regHex);
    glCallList(regHex+1);
    glPopMatrix();


    glFlush();
}



void winReshapeFcn(GLint newWidth, GLint newHeight)
{
    glViewport(0, 0, (GLsizei)newWidth, (GLsizei)newHeight);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(-320.0, 320.0, -320.0, 320.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    glClear(GL_COLOR_BUFFER_BIT);
}


void main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowPosition(300, 300);
    glutInitWindowSize(winWidth, winHeight);
    glutCreateWindow("Hexagon - utilizarea listelor de display");

    init();
    glutDisplayFunc(displayHex);
    glutReshapeFunc(winReshapeFcn);

    glutMainLoop();

}