Re: [Flashcoders] seeking :: Oscillating SineWaves via Drawing API

[Martin Wood]

its quick and its dirty but it should give you something to work with :


for(var n=0;n<3;n++)
{
        var sinewave:MovieClip = _root.createEmptyMovieClip("sinewave" + n,n+1);
        
        sinewave._y = 100;
        
        sinewave.phase = n * 10;
        sinewave.frequency = ((n + 1) * 5) / 50;
        sinewave.amplitude = 60 - (n * 10);
        sinewave.speed = (n + 1) / 5;
        sinewave.heightDeviation = Math.random() * 30;
        
        sinewave.onEnterFrame = function()
        {
                this.phase+=this.speed;
		_root.drawSineWave(this,this.phase,this.amplitude + (Math.sin(this.phase) * 
this.heightDeviation),this.frequency);
        }
}

function drawSineWave(mc:MovieClip, phase:Number, amplitude:Number, 
frequency:Number)
{
        var numPoints:Number = 80;
        var width = 550;

        mc.clear();
        mc.lineStyle(2,0,100);  
        
        var y:Number = Math.sin(phase * frequency) * amplitude;
        
        mc.moveTo(0,y);
        
        var dx:Number = width / numPoints;
        
        for(var x=0;x<numPoints;x++)
        {
                y = Math.sin((phase + x) * frequency) * amplitude;
                mc.lineTo(x * dx,y);
        }
}

you can just stick this into the first frame of an .fla

let me know if you need some explanations.

thanks,

Martin

artur wrote:
its 3 waves that need to appear randomly oscillating in height..
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