Esempio n. 1
0
void LineDDA(void)
{
  double dx=(X2-X1);
  double dy=(Y2-Y1);
  float xInc,yInc,x=X1,y=Y1;
  /* Find out whether to increment x or y */
  int dStart = 2*dy - dx;
  int dE = 2*dy;
  int dNE = 2*(dy - dx);
  /* Clears buffers to preset values */
  glClear(GL_COLOR_BUFFER_BIT);

  /* Plot the points */
  glBegin(GL_POINTS);
  /* Plot the first point */
  glVertex2d(x,y);
  int d;
  /* For every step, find an intermediate vertex */
  d = dStart;
  while(x<X2 && y<Y2)
  {
    if(d<0){
      d = d + dE;
    }else{
      d = d + dNE;
      y = y + 1;
    }
    x = x + 1;
    printf("%0.6lf %0.6lf\n",floor(x), floor(y)); 
    glVertex2d(round_value(x), round_value(y));
  }
  glEnd();

  glFlush();
}
Esempio n. 2
0
Vec2<Type> &Vec2<Type>::rotate(const Vec2<Type>& hotspot, const Angle &angle)
{
	// Move the hotspot to 0,0
	Vec2<Type> r(x - hotspot.x, y - hotspot.y);

	float radians = angle.to_radians();
	float sin_angle = sinf(radians);
	float cos_angle = cosf(radians);

	float dest_x = (float) r.x * cos_angle - (float) r.y * sin_angle;
	float dest_y = (float) r.x * sin_angle + (float) r.y * cos_angle;

	x = round_value(dest_x + hotspot.x);
	y = round_value(dest_y + hotspot.y);
	return *this;
}