gistfile1.js

(function() {
    PulseEntity.prototype = {
        colors: [ "#F00", "#0F0", "#00F" ],
        
        // Return the initial state.
        initialState: function(stateWrapper) {
            return {
                // 64 bit absolute UTC timestamp of the current time
                startTime: stateWrapper.now,
                currentColor: 0  
            };
        },
        
        // how often (in seconds) should the update function be called ideally.
        desiredFrequency: function() {
            return 1;
        },
        
        update: function(stateWrapper) {
            // 64 bit absolute UTC timestamp of the last time this function was 
            // successfully called on any host
            var lastExecution = stateWrapper.lastExecution
            // A replacement for the entity ID.  The domain server gives each 
            // executor of the script it's own token and uses the token on incoming 
            // edit packets to do conflict resolution 
            var entityToken = stateWrapper.entityToken

            var state = stateWrapper.state;

            // Determine the interval between the start time and the current time
            var interval = stateWrapper.now - state.startTime;
            // Convert to seconds
            interval = interval / 1000;
            
            // Cycle between a size of 0.1 and 2.1 meters
            var desiredSize = Math.sin((interval % 60) / 60.0 * Math.PI * 2.0) + 1.1;
            Entities.editEntity(entityToken, {
                dimensions: {
                    x: desiredSize,
                    y: desiredSize,
                    z: desiredSize,
                },
                color: colors[state.currentColor]
            });
            
            state.currentColor = (state.currentColor + 1) % colors.length; 
        }
    };

    return new PulseEntity();
});