This Is Kind of Psychadelic

I get a lot of traffic on this blog but no comments or emails.  Feedback of any kind is welcome!  And just a reminder if you haven't seen the first post, this can all be done in the browser-based environment found here.  It's a template I have set up for the code snippets highlighted near the bottom of posts.

In the function SwirlColor we use a "shortcut", the ternary operation, for something we type out a lot, the if/else statement.  Each of the following produce the same result:

1)
if      (Math.Random() > 5)  {colR     += -1;}                        
test?       -         operation       -        var    -    change depending on result
else  {colR    += 1;}                                                              
test? -  var    -   change depending on result                                               

2)                                                                       result is -  true  :   false        
colR    +=          Math.Random() > 5     ?                            -1    :    1;          
var    -   change       -           operation       -       test?    -    change depending on operation 

This isn't applicable to a lot of situations but is a fun concept to learn.  A great place to use it is on a rotating, rectangular device where we want to have a variable to be a fraction of either the height or width, depending on orientation so that the output is the same regardless of orientation.
(ex    C_C = widthInt < heightInt ? widthInt / 10 : heightInt / 10; )

New variables in this design:

• colR/colG/colB are holders for the rgb values (ex. rgb(100,0,255) = colR,colG,colB)
• dcMin/Max is the change(d) in color(c) Min and Max between each layer
• SwirlRadius is each individual circle we see, starting with the largest and layering smaller circles on top in the do loop
• SwitchColor is used to determine if we're changing R, G, or B.  It changes at the beginning of SwirlColor()

function drawShapes() {

    c.translate(w / 2, h / 2);

    speed = 500;

    swirlRadius = h / 2;
    switchColor = 1;
    i = 1;

dcMin = 1;
dcMax = 3;

    colR = 155;
    colG = 155;
    colB = 5;

    setInterval(function() {

        do {

            swirlColor();

            c.beginPath();
            c.fillStyle = "rgb(" + colR + "," + colG + "," + colB + ")";
            c.arc(0, 0, swirlRadius, 0, Math.PI * 2, true);
            c.fill();

            swirlRadius -= Math.floor((Math.random() * 10) + 5);

        } while (swirlRadius > 10);

        i++;
        swirlRadius = h / 2;

    }, speed);

}

function swirlColor() {

    if (i > 10) {
        i = 1;
        switchColor = Math.floor((Math.random() * 2) + 1);
    }

    switch (switchColor) {
    case 1:
        colR += Math.random() > 0.5 ? dcMin : dcMax;
        if (colR > 255) colR = 1;
        if (colR < 0) colR = 255;
        break;
    case 2:
        colG += Math.random() > 0.5 ? dcMin : dcMax;
        if (colG > 255) colG = 1;
        if (colG < 0) colG = 255;
        break;
    case 3:
        colB += Math.random() > 0.5 ? dcMin : dcMax;
        if (colB > 255) colB = 1;
        if (colB < 0) colB = 255;
        break;
    }

}