if(x1==0) x1= 127;  	//Rescale x-axis to be inverted
else{
    	if(x1>128){ //This if-else reverses the two halves of the x-scale
     		x1-=128;
		/*x1= ~x1;  	//This code flips the x-axis
		x1+=1;*/
    	}
		else{
     		x1+=128;
		/*x1= ~x1;  	//This code flips the x-axis
		x1+=1;*/
    	}	
		}
if(y1>128){  	//This if-else inverts the y-scale
	y1-=128;
/*  y1= ~y1;  	//This code flips the y-axis
	y1+=1;*/
}
else{
	y1= (y1 ^ 0x80);
/*  y1= ~y1;  	//This code flips the y-axis
	y1+=1;*/
}