Miscellany

/* Basic i/o libraries */
#include <stdio.h>
#include <stdlib.h>

/* OpenGL defines/includes */
#define GLUT_DISABLE_ATEXIT_HACK
#include <stdarg.h>
#include <GL\gl.h>
#include <GL\glu.h>
#include <GL\glut.h>

void MakeWindow(void);

void WindowDisplay(void);

void WindowKeyboard(unsigned char key, int x, int y);

void WindowReshape(int w, int h);

void DrawTrajectory();

int xcalc(float v, float t, float ti);

int ycalc(float v, float t, float ti);

void DrawTank(int x,int y);

int wnd;

int main(int argc, char *argv[])
{
  glutInit(&argc, argv); /* Initialize glut */
  
  MakeWindow();
  
  glutMainLoop();
  return 0;
}

void MakeWindow(void)
{
  glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
  glutInitWindowSize(500,500);

  wnd = glutCreateWindow("Draw");
  glClearColor(1,1,1,0);		/* set clear color to white */

  glutDisplayFunc(WindowDisplay);
  glutKeyboardFunc(WindowKeyboard);
  glutReshapeFunc(WindowReshape);
}

void WindowDisplay(void)
{
  DrawTrajectory();
  DrawTank(0,0);
  glutSwapBuffers();
}

void WindowKeyboard(unsigned char key, int x, int y)
{
  if( key == 'q' || key == 'Q' ) exit(0);
}

void WindowReshape(int w, int h)
{
  glViewport(0, 0, w, h);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluOrtho2D(0, w, h, 0);
  glMatrixMode(GL_MODELVIEW);
}

int xcalc(float v, float t, float ti)
{
    return (int) (v*ti)*cos(t);
}

int ycalc(float v, float t, float ti)
{
    return (int) (v*ti)*sin(t)-4.905*(ti*ti);
}

void DrawTrajectory(){
  float time=.01; int tx,ty;
  
  glClear(GL_COLOR_BUFFER_BIT);
  glColor3f(0,0,0);
  glBegin(GL_POINTS);
  while (time <= 50) {
        glVertex2i(xcalc(50,.785,time),ycalc(50,.785,time));
        time=time+.01;
  }
  glEnd();
}

void DrawTank(int x,int y){

  glColor3f(1,0,0);
  glBegin(GL_POLYGON);
  glVertex2i(x,y);
  glVertex2i(x,25+y);
  glVertex2i(50+x,25+y);
  glVertex2i(50+x,y);
  glEnd();
}