pixelbutler/build/core/FPS.js

Low-res bitmap render engine for big screens

'use strict';
var FPS = (function () {
    function FPS(smoothFPS, smoothDelta) {
        if (typeof smoothFPS === "undefined") { smoothFPS = 30; }
        if (typeof smoothDelta === "undefined") { smoothDelta = 2; }
        this.tickHistory = [0];
        this.deltaHistory = [0];
        this.tickI = 0;
        this.deltaI = 0;
        this.smoothFPS = smoothFPS;
        this.smoothDelta = smoothDelta;
        this.previous = performance.now();
    }
    FPS.prototype.begin = function () {
        var now = performance.now();
        var delta = now - this.previous;
        this.tickHistory[this.tickI % this.smoothFPS] = delta;
        this.tickI++;
        this.previous = now;
    };
    FPS.prototype.end = function () {
        var now = performance.now();
        var delta = now - this.previous;
        this.deltaHistory[this.deltaI % this.smoothDelta] = delta;
        this.deltaI++;
    };
    Object.defineProperty(FPS.prototype, "fps", {
        get: function () {
            var tot = 0;
            for (var i = 0; i < this.tickHistory.length; i++) {
                tot += this.tickHistory[i];
            }
            return Math.ceil(1000 / (tot / this.tickHistory.length));
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(FPS.prototype, "redraw", {
        get: function () {
            var tot = 0;
            for (var i = 0; i < this.deltaHistory.length; i++) {
                tot += this.deltaHistory[i];
            }
            return Math.ceil(tot / this.deltaHistory.length);
        },
        enumerable: true,
        configurable: true
    });
    return FPS;
})();
module.exports = FPS;