OpenGL

gg.cpp

#include <GL/glut.h>
#include <stdlib.h>

void init(void);
void display(void);
void keyboard(unsigned char key, int x, int y);

int main(int argc, char** argv){
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
    glutInitWindowSize(1000, 1000);
    glutInitWindowPosition(100, 100);
    glutCreateWindow("Exercicio 02");
    init();
    glutDisplayFunc(display);
    glutKeyboardFunc(keyboard);
    glutMainLoop();
    return 0;
}

void init(void){
    glClearColor(0.0, 0.0, 0.0, 1.0);
    glOrtho(0, 256, 0, 256, -1, 1);
}

void drawStar(int size) {
    glVertex2f(20.0f * size, 20.0f * size); // 1
    glVertex2f(40.0f * size, 80.0f * size); // 2
    glVertex2f(40.0f * size, 80.0f * size); // 2
    glVertex2f(60.0f * size, 20.0f * size); // 3
    glVertex2f(60.0f * size, 20.0f * size); // 3
    glVertex2f(10.0f * size, 55.0f * size); // 4
    glVertex2f(10.0f * size, 55.0f * size); // 4
    glVertex2f(70.0f * size, 55.0f * size); // 5
    glVertex2f(70.0f * size, 55.0f * size); // 5
    glVertex2f(20.0f * size, 20.0f * size); // 6
}

void drawHorizontalLine(float x) {
    glVertex2f(x, 20.0f);
    glVertex2f(x, 40.0f);
}

void display(void){
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1.0,1.0,1.0);
    glBegin(GL_LINES);
    //inicio
    //Estrela
        // G
        drawHorizontalLine(20.0f);

        glVertex2f(20.0f, 20.0f);
        glVertex2f(30.0f, 20.0f);

        glVertex2f(20.0f, 40.0f);
        glVertex2f(30.0f, 40.0f);

        glVertex2f(30.0f, 20.0f);
        glVertex2f(30.0f, 30.0f);

        glVertex2f(25.0f, 30.0f);
        glVertex2f(30.0f, 30.0f);

        // E
        drawHorizontalLine(35.0f);

        glVertex2f(35.0f, 20.0f);
        glVertex2f(45.0f, 20.0f);

        glVertex2f(35.0f, 30.0f);
        glVertex2f(45.0f, 30.0f);

        glVertex2f(35.0f, 40.0f);
        glVertex2f(45.0f, 40.0f);

        // O
        drawHorizontalLine(50.0f);

        glVertex2f(50.0f, 20.0f);
        glVertex2f(60.0f, 20.0f);

        drawHorizontalLine(60.0f);

        glVertex2f(50.0f, 40.0f);
        glVertex2f(60.0f, 40.0f);

        // G
        drawHorizontalLine(65.0f);

        glVertex2f(65.0f, 20.0f);
        glVertex2f(75.0f, 20.0f);

        glVertex2f(65.0f, 40.0f);
        glVertex2f(75.0f, 40.0f);

        glVertex2f(75.0f, 20.0f);
        glVertex2f(75.0f, 30.0f);

        glVertex2f(70.0f, 30.0f);
        glVertex2f(75.0f, 30.0f);

        // E
        drawHorizontalLine(80.0f);

        glVertex2f(80.0f, 20.0f);
        glVertex2f(90.0f, 20.0f);

        glVertex2f(80.0f, 30.0f);
        glVertex2f(90.0f, 30.0f);

        glVertex2f(80.0f, 40.0f);
        glVertex2f(90.0f, 40.0f);

        drawStar(1);

    // fim
    glEnd();
    glFlush();
}

void keyboard(unsigned char key, int x, int y){
    switch(key){
    case 27:
        exit(0);
        break;
    }
}