Character movement.

  
void swapTermsInt(int *a, int *b) {
	int temp;
	temp=*a;
	*a=*b;
	*b=temp;
}
void ApproxNextX(int dirVector)  {
	if(errorterm>=0)
	{
		xinc = stepx;
		errorterm +=k2;
	} else 
		errorterm +=k1;
	yinc=stepy;
}
void ApproxNextY(int dirVector)  {
	if(errorterm >=0)
	{
		yinc = stepy;
		errorterm +=k2;
	} else
		errorterm +=k1;
	xinc=stepx;
}

bool GetSlope() {
	int dx, dy;

	int y1=ego.y;
	int y2=move2.y;
	int x2=move2.x;
	int x1=ego.x;
	
	 dx=x2-x1;
	 dy=y2-y1;
	 if(dx >0) {
			stepx=3;	
		} else
		{
			dx=-dx;
			stepx=-3;
		}
	if(dy >0) {
		stepy=3;	
		} else {
		dy=-dy;
		stepy=-3;
	}
	if(dx>dy) {
		
	 k1=dy<<2;
	 k2=k1-(int)(dx<<2);
	 errorterm=k1-(int)dx;
	 ApproxNextY(dy);
	 return true;
	}
	else {
		
		k1=dx<<2;
		k2=k1-(int)(dy <<2);
		errorterm=k1-(int)dy;
		ApproxNextX(dx);
		return false;
	}
}