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for(n=0;n<(k-1);n++){

    x0=datax[n];
    x1=datax[n+1];
    y0=datay[n];
    y1=datay[n+1];	
	dx = x1 - x0;

	sx = (dx > 0) ? 1 : -1; 
	if (dx < 0) dx = -dx; dy = y1 - y0; sy = (dy > 0) ? 1 : -1; 
	if (dy < 0) dy = -dy; dx2 = dx << 1; 

	dy2 = dy << 1; 

	if (dy <= dx) 
	{ 

	e = dy2 - dx; 
	for (i = 0; i <= dx; ++i) { 
		Out[abs(y0/2)][abs(x0/2)]=2; 
		while (e >= 0) { y0 += sy; e -= dx2; } x0 += sx; e += dy2; } } 
	else {  temp = x0; x0 = y0; y0 = temp; 

	temp = dx; dx = dy; dy = temp; 

	temp = dx2; dx2 = dy2; dy2 = temp; 

	temp = sx; sx = sy; 
	sy = temp; e = dy2 - dx; 
	for (i = 0; i <= dx; ++i) { 
		Out[abs(x0)][abs(y0)]=2; 
		while (e >= 0) { 
		y0 += sy; 
		e -= dx2; 
		} 
		x0 += sx; 
		e += dy2; 
	} 

}