// View output to see simulator.

// Drag the model to rotate (requires Chrome or Firefox).

// Open your JavaScript console to view errors.

​

(new Blinken({title: "Red Snake", 

              author: "Anonymous"})).run(function () {

    // My self-contained program goes here.    

    var x = 0;

    var d = 1;

    var n = 10;

​

    // Update lights one frame

    return function (lights) {

        for (i = 0; i < lights.length; i++) {

            if (i > x - n && i < x + n) {

                lights[i].rgb(1, 0, 0);

            } else {

                lights[i].rgb(0, 0, 0);

            }

        }

        x += d;

        if (x == lights.length+n || x == -n) {

            d *= -1;

        }

        return 50; // ms until called again

    };

});

​