/* Demo of drawing points

Implemented Fall 2005
Scott D. Anderson
*/

#include <stdio.h>
#include <tw.h>

const int NUM_POINTS = 8;

// Vertices for quads have to be given in counterclockwise order
// These vertices make flat quads.
twTriple points[NUM_POINTS] = 
{
  {0,0,0},
  {1,0,0},
  {2,1,0},
  {3,3,0},

  {3,3,3},
  {2,4,2},
  {-1,6,0},
  {0,5,1},
};

void drawPicture() {
    glBegin(GL_QUADS);
    twColorName(TW_RED);
    glVertex3fv(points[0]);
    glVertex3fv(points[1]);
    glVertex3fv(points[2]);
    glVertex3fv(points[3]);

    twColorName(TW_GREEN);
    glVertex3fv(points[4]);
    glVertex3fv(points[5]);
    glVertex3fv(points[6]);
    glVertex3fv(points[7]);

    glEnd();
}

void display(void) {
    twDisplayInit();
    twCamera();

    drawPicture();

    glFlush();
    glutSwapBuffers();
}

int main(int argc, char** argv) {
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  twInitWindowSize(500,500);
  glutCreateWindow(argv[0]);
  glutDisplayFunc(display);
  twVertexArray(points, NUM_POINTS); // determines bounding box from array
  twMainInit();            
  glutMainLoop();
  return 0;
}