Question

Drawing “flat” waves is easy, but I want to draw the wave between two points x1,y1 x2,y2

Here is the “flat” code:

package display
{
    import flash.display.Sprite;
    import flash.events.Event;

    public class SineWave extends Sprite
    {
        private var angle:Number = 0;
        private var centerY:Number = 200;
        private var range:Number = 50;
        private var xspeed:Number = 2;
        private var yspeed:Number = .1;
        private var xpos:Number
        private var ypos:Number

        public function SineWave()
        {
            init()
        }

        protected function init():void
        {
            var sinWavePosition = 100;
            var cosWavePosition = 200;
            var sinWaveColor:uint = 0xFF0000;
            var cosWaveColor:uint = 0x00FF00;
            var waveMultiplier:Number = 10;
            var waveStretcher:Number = 5;

            var i:uint;
            for(i = 1; i < 500; i++)
            {
                var sinPosY:Number = Math.sin(i / waveStretcher) * waveMultiplier;
                var cosPosY:Number = Math.cos(i / waveStretcher) * waveMultiplier;

                graphics.beginFill(sinWaveColor);
                graphics.drawRect(i, sinWavePosition + sinPosY, 2, 2);   
                graphics.beginFill(cosWaveColor);
                graphics.drawRect(i, cosWavePosition + cosPosY, 2, 2);
            }

        }
    }
}

Answer 1

What about a bezier curve? This isn’t a sine wave per se. But the effect is similar. With proper control points you should be able to make it look just like a sine wave.