ninja captain

Just a simple way to draw a sine wave with a specific amplitude and frequency. Use the sliders to adjust the values.

Here’s the main function:

function drawWave(amp:int, freq:int):void{
	newSine.graphics.clear();
	newSine.graphics.lineStyle(2, 0xff0000, 0.4);
	newSine.graphics.moveTo(0, yaxis);
	for(var i:int=0; i<=stage.stageWidth; i++){
		var ang:Number = 2 * Math.PI * freq * i/stage.stageWidth;
		newSine.graphics.lineTo(i, yaxis - amp*Math.sin(ang));
	}
}

(EDIT 8/14/09: In the SWF above, the sine wave is upside down. That’s because I had a typo when I wrote it. On line 7 of the code, I had typed “…yaxis + amp…” but it should be minus. The code above is correct, but the SWF hasn’t been updated)