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Tag: bitwise

XOR Conditional

By Zevan
addEventListener(Event.ENTER_FRAME, onLoop);

function onLoop(evt:Event):void {
	var boolA:Boolean = false;
	var boolB:Boolean = false;
	
	if (mouseX > 200){
		boolA = true;
	}else{
		boolA = false;
	}
	
	if (mouseY < 200){
		boolB = true
	}else{
		boolB = false;
	}
	
	if (boolA || boolB){
		trace("regular or");
	}
	
// this is the XOR conditional
	if (int(boolA) ^ int(boolB)){
		trace("exclusive or");
	}
	
}

There’s an obvious more logical ways to do this. But I thought it was somewhat interesting to see….

So in binary XOR will give us:
0^0 = 0;
0^1 = 1;
1^0 = 1;
1^1 = 0;

What other operator might you use to get the same results?… that’s right !=

With regular OR we get:
0|0 = 0;
0|1 = 1;
1|0 = 1;
1|1 = 1;

Read snippet: XOR Conditional

XOR Color Invert

By Zevan
var yellow:uint = 0xFFFF00;

// draws yellow circle
with(graphics) beginFill(yellow), drawCircle(100,100,50);

// invert the color using XOR assignment
// yellow becomes 0x0000FF
yellow ^= 0xFFFFFF;

// draws blue  circle 
with(graphics) beginFill(yellow), drawCircle(200,100,50);

Just a fun use for XOR. You could also do it without XOR assignment:

with(graphics) beginFill(yellow ^ 0xFFFFFF), drawCircle(200,100,50);

Playing a little with bitwise operators is a good way to make sure you understand them. Try tweaking this trace statement:

trace((0x543210 ^ 0xFFFFFF).toString(16));

If you’d like to read about bitwise operators, I recommend wikipedia’s article.

Read snippet: XOR Color Invert