asterix-app/src/main/resources/webui/static/js/smoothie.js

;(function(exports) {

  var Util = {
    extend: function() {
      arguments[0] = arguments[0] || {};
      for (var i = 1; i < arguments.length; i++)
      {
        for (var key in arguments[i])
        {
          if (arguments[i].hasOwnProperty(key))
          {
            if (typeof(arguments[i][key]) === 'object') {
              if (arguments[i][key] instanceof Array) {
                arguments[0][key] = arguments[i][key];
              } else {
                arguments[0][key] = Util.extend(arguments[0][key], arguments[i][key]);
              }
            } else {
              arguments[0][key] = arguments[i][key];
            }
          }
        }
      }
      return arguments[0];
    }
  };

  /**
   * Initialises a new <code>TimeSeries</code> with optional data options.
   *
   * Options are of the form (defaults shown):
   *
   * <pre>
   * {
   *   resetBounds: true,        
   *   resetBoundsInterval: 3000 
   * }
   * </pre>
   *
   * Presentation options for TimeSeries are specified as an argument to <code>SmoothieChart.addTimeSeries</code>.
   *
   * @constructor
   */
  function TimeSeries(options) {
    this.options = Util.extend({}, TimeSeries.defaultOptions, options);
    this.data = [];
    this.maxValue = Number.NaN; 
    this.minValue = Number.NaN; 
  }

  TimeSeries.defaultOptions = {
    resetBoundsInterval: 3000,
    resetBounds: false
  };

  /**
   * Recalculate the min/max values for this <code>TimeSeries</code> object.
   *
   * This causes the graph to scale itself in the y-axis.
   */
  TimeSeries.prototype.resetBounds = function() {
    if (this.data.length) {
      
      this.maxValue = this.data[0][1];
      this.minValue = this.data[0][1];
      for (var i = 1; i < this.data.length; i++) {
        var value = this.data[i][1];
        if (value > this.maxValue) {
          this.maxValue = value;
        }
        if (value < this.minValue) {
          this.minValue = value;
        }
      }
    } else {
      
      this.maxValue = Number.NaN;
      this.minValue = Number.NaN;
    }
  };

  /**
   * Adds a new data point to the <code>TimeSeries</code>, preserving chronological order.
   *
   * @param timestamp the position, in time, of this data point
   * @param value the value of this data point
   * @param sumRepeatedTimeStampValues if <code>timestamp</code> has an exact match in the series, this flag controls
   * whether it is replaced, or the values summed (defaults to false.)
   */
  TimeSeries.prototype.append = function(timestamp, value, sumRepeatedTimeStampValues) {
    
    var i = this.data.length - 1;
    while (i > 0 && this.data[i][0] > timestamp) {
      i--;
    }

    if (this.data.length > 0 && this.data[i][0] === timestamp) {
      
      if (sumRepeatedTimeStampValues) {
        
        this.data[i][1] += value;
        value = this.data[i][1];
      } else {
        
        this.data[i][1] = value;
      }
    } else if (i < this.data.length - 1) {
      
      this.data.splice(i + 1, 0, [timestamp, value]);
    } else {
      
      this.data.push([timestamp, value]);
    }

    this.maxValue = isNaN(this.maxValue) ? value : Math.max(this.maxValue, value);
    this.minValue = isNaN(this.minValue) ? value : Math.min(this.minValue, value);
  };

  TimeSeries.prototype.dropOldData = function(oldestValidTime, maxDataSetLength) {
    
    
    var removeCount = 0;
    while (this.data.length - removeCount >= maxDataSetLength && this.data[removeCount + 1][0] < oldestValidTime) {
      removeCount++;
    }
    if (removeCount !== 0) {
      this.data.splice(0, removeCount);
    }
  };

  /**
   * Initialises a new <code>SmoothieChart</code>.
   *
   * Options are optional, and should be of the form below. Just specify the values you
   * need and the rest will be given sensible defaults as shown:
   *
   * <pre>
   * {
   *   minValue: undefined,        
   *   maxValue: undefined,        
   *   maxValueScale: 1,           
   *   yRangeFunction: undefined,  
   *   scaleSmoothing: 0.125,      
   *   millisPerPixel: 20,         
   *   maxDataSetLength: 2,
   *   interpolation: 'bezier'     
   *   timestampFormatter: null,   
   *   horizontalLines: [],        
   *   grid:
   *   {
   *     fillStyle: '#000000',     
   *     lineWidth: 1,             
   *     strokeStyle: '#777777',   
   *     millisPerLine: 1000,      
   *     sharpLines: false,        
   *     verticalSections: 2,      
   *     borderVisible: true       
   *   },
   *   labels
   *   {
   *     disabled: false,          
   *     fillStyle: '#ffffff',     
   *     fontSize: 15,
   *     fontFamily: 'sans-serif',
   *     precision: 2
   *   },
   * }
   * </pre>
   *
   * @constructor
   */
  function SmoothieChart(options) {
    this.options = Util.extend({}, SmoothieChart.defaultChartOptions, options);
    this.seriesSet = [];
    this.currentValueRange = 1;
    this.currentVisMinValue = 0;
  }

  SmoothieChart.defaultChartOptions = {
    millisPerPixel: 20,
    maxValueScale: 1,
    interpolation: 'bezier',
    scaleSmoothing: 0.125,
    maxDataSetLength: 2,
    grid: {
      fillStyle: '#000000',
      strokeStyle: '#777777',
      lineWidth: 1,
      sharpLines: false,
      millisPerLine: 1000,
      verticalSections: 2,
      borderVisible: true
    },
    labels: {
      fillStyle: '#ffffff',
      disabled: false,
      fontSize: 10,
      fontFamily: 'monospace',
      precision: 2
    },
    horizontalLines: []
  };

  SmoothieChart.AnimateCompatibility = (function() {
    var lastTime = 0,
        requestAnimationFrame = function(callback, element) {
          var requestAnimationFrame =
            window.requestAnimationFrame        ||
            window.webkitRequestAnimationFrame  ||
            window.mozRequestAnimationFrame     ||
            window.oRequestAnimationFrame       ||
            window.msRequestAnimationFrame      ||
            function(callback) {
              var currTime = new Date().getTime(),
                  timeToCall = Math.max(0, 16 - (currTime - lastTime)),
                  id = window.setTimeout(function() {
                    callback(currTime + timeToCall);
                  }, timeToCall);
              lastTime = currTime + timeToCall;
              return id;
            };
          return requestAnimationFrame.call(window, callback, element);
        },
        cancelAnimationFrame = function(id) {
          var cancelAnimationFrame =
            window.cancelAnimationFrame ||
            function(id) {
              clearTimeout(id);
            };
          return cancelAnimationFrame.call(window, id);
        };

    return {
      requestAnimationFrame: requestAnimationFrame,
      cancelAnimationFrame: cancelAnimationFrame
    };
  })();

  SmoothieChart.defaultSeriesPresentationOptions = {
    lineWidth: 1,
    strokeStyle: '#ffffff'
  };

  /**
   * Adds a <code>TimeSeries</code> to this chart, with optional presentation options.
   *
   * Presentation options should be of the form (defaults shown):
   *
   * <pre>
   * {
   *   lineWidth: 1,
   *   strokeStyle: '#ffffff',
   *   fillStyle: undefined
   * }
   * </pre>
   */
  SmoothieChart.prototype.addTimeSeries = function(timeSeries, options) {
    this.seriesSet.push({timeSeries: timeSeries, options: Util.extend({}, SmoothieChart.defaultSeriesPresentationOptions, options)});
    if (timeSeries.options.resetBounds && timeSeries.options.resetBoundsInterval > 0) {
      timeSeries.resetBoundsTimerId = setInterval(
        function() {
          timeSeries.resetBounds();
        },
        timeSeries.options.resetBoundsInterval
      );
    }
  };

  /**
   * Removes the specified <code>TimeSeries</code> from the chart.
   */
  SmoothieChart.prototype.removeTimeSeries = function(timeSeries) {
    var numSeries = this.seriesSet.length;
    for (var i = 0; i < numSeries; i++) {
      if (this.seriesSet[i].timeSeries === timeSeries) {
        this.seriesSet.splice(i, 1);
        break;
      }
    }
    if (timeSeries.resetBoundsTimerId) {
      clearInterval(timeSeries.resetBoundsTimerId);
    }
  };

  /**
   * Instructs the <code>SmoothieChart</code> to start rendering to the provided canvas, with specified delay.
   *
   * @param canvas the target canvas element
   * @param delayMillis an amount of time to wait before a data point is shown. This can prevent the end of the series
   * from appearing on screen, with new values flashing into view, at the expense of some latency.
   */
  SmoothieChart.prototype.streamTo = function(canvas, delayMillis) {
    this.canvas = canvas;
    this.delay = delayMillis;
    this.start();
  };

  /**
   * Starts the animation of this chart.
   */
  SmoothieChart.prototype.start = function() {
    if (this.frame) {
      return;
    }

    var animate = function() {
      this.frame = SmoothieChart.AnimateCompatibility.requestAnimationFrame(function() {
        this.render();
        animate();
      }.bind(this));
    }.bind(this);

    animate();
  };

  /**
   * Stops the animation of this chart.
   */
  SmoothieChart.prototype.stop = function() {
    if (this.frame) {
      SmoothieChart.AnimateCompatibility.cancelAnimationFrame(this.frame);
      delete this.frame;
    }
  };

  SmoothieChart.prototype.updateValueRange = function() {
    var chartOptions = this.options,
        chartMaxValue = Number.NaN,
        chartMinValue = Number.NaN;

    for (var d = 0; d < this.seriesSet.length; d++) {
      var timeSeries = this.seriesSet[d].timeSeries;
      if (!isNaN(timeSeries.maxValue)) {
        chartMaxValue = !isNaN(chartMaxValue) ? Math.max(chartMaxValue, timeSeries.maxValue) : timeSeries.maxValue;
      }

      if (!isNaN(timeSeries.minValue)) {
        chartMinValue = !isNaN(chartMinValue) ? Math.min(chartMinValue, timeSeries.minValue) : timeSeries.minValue;
      }
    }

    if (chartOptions.maxValue != null) {
      chartMaxValue = chartOptions.maxValue;
    } else {
      chartMaxValue *= chartOptions.maxValueScale;
    }

    if (chartOptions.minValue != null) {
      chartMinValue = chartOptions.minValue;
    }

    if (this.options.yRangeFunction) {
      var range = this.options.yRangeFunction({min: chartMinValue, max: chartMaxValue});
      chartMinValue = range.min;
      chartMaxValue = range.max;
    }

    if (!isNaN(chartMaxValue) && !isNaN(chartMinValue)) {
      var targetValueRange = chartMaxValue - chartMinValue;
      this.currentValueRange += chartOptions.scaleSmoothing * (targetValueRange - this.currentValueRange);
      this.currentVisMinValue += chartOptions.scaleSmoothing * (chartMinValue - this.currentVisMinValue);
    }

    this.valueRange = { min: chartMinValue, max: chartMaxValue };
  };

  SmoothieChart.prototype.render = function(canvas, time) {
    canvas = canvas || this.canvas;
    time = time || new Date().getTime() - (this.delay || 0);


    time -= time % this.options.millisPerPixel;

    var context = canvas.getContext('2d'),
        chartOptions = this.options,
        dimensions = { top: 0, left: 0, width: canvas.clientWidth, height: canvas.clientHeight },
        oldestValidTime = time - (dimensions.width * chartOptions.millisPerPixel),
        valueToYPixel = function(value) {
          var offset = value - this.currentVisMinValue;
          return this.currentValueRange === 0
            ? dimensions.height
            : dimensions.height - (Math.round((offset / this.currentValueRange) * dimensions.height));
        }.bind(this),
        timeToXPixel = function(t) {
          return Math.round(dimensions.width - ((time - t) / chartOptions.millisPerPixel));
        };

    this.updateValueRange();

    context.font = chartOptions.labels.fontSize + 'px ' + chartOptions.labels.fontFamily;

    context.save();

    context.translate(dimensions.left, dimensions.top);

    context.beginPath();
    context.rect(0, 0, dimensions.width, dimensions.height);
    context.clip();

    context.save();
    context.fillStyle = chartOptions.grid.fillStyle;
    context.clearRect(0, 0, dimensions.width, dimensions.height);
    context.fillRect(0, 0, dimensions.width, dimensions.height);
    context.restore();

    context.save();
    context.lineWidth = chartOptions.grid.lineWidth;
    context.strokeStyle = chartOptions.grid.strokeStyle;
    if (chartOptions.grid.millisPerLine > 0) {
      var textUntilX = dimensions.width - context.measureText(minValueString).width + 4;
      for (var t = time - (time % chartOptions.grid.millisPerLine);
           t >= oldestValidTime;
           t -= chartOptions.grid.millisPerLine) {
        var gx = timeToXPixel(t);
        if (chartOptions.grid.sharpLines) {
          gx -= 0.5;
        }
        context.beginPath();
        context.moveTo(gx, 0);
        context.lineTo(gx, dimensions.height);
        context.stroke();
        context.closePath();

        if (chartOptions.timestampFormatter && gx < textUntilX) {
          
          var tx = new Date(t),
            ts = chartOptions.timestampFormatter(tx),
            tsWidth = context.measureText(ts).width;
          textUntilX = gx - tsWidth - 2;
          context.fillStyle = chartOptions.labels.fillStyle;
          context.fillText(ts, gx - tsWidth, dimensions.height - 2);
        }
      }
    }

    for (var v = 1; v < chartOptions.grid.verticalSections; v++) {
      var gy = Math.round(v * dimensions.height / chartOptions.grid.verticalSections);
      if (chartOptions.grid.sharpLines) {
        gy -= 0.5;
      }
      context.beginPath();
      context.moveTo(0, gy);
      context.lineTo(dimensions.width, gy);
      context.stroke();
      context.closePath();
    }
    if (chartOptions.grid.borderVisible) {
      context.beginPath();
      context.strokeRect(0, 0, dimensions.width, dimensions.height);
      context.closePath();
    }
    context.restore();

    if (chartOptions.horizontalLines && chartOptions.horizontalLines.length) {
      for (var hl = 0; hl < chartOptions.horizontalLines.length; hl++) {
        var line = chartOptions.horizontalLines[hl],
            hly = Math.round(valueToYPixel(line.value)) - 0.5;
        context.strokeStyle = line.color || '#ffffff';
        context.lineWidth = line.lineWidth || 1;
        context.beginPath();
        context.moveTo(0, hly);
        context.lineTo(dimensions.width, hly);
        context.stroke();
        context.closePath();
      }
    }

    for (var d = 0; d < this.seriesSet.length; d++) {
      context.save();
      var timeSeries = this.seriesSet[d].timeSeries,
          dataSet = timeSeries.data,
          seriesOptions = this.seriesSet[d].options;

      timeSeries.dropOldData(oldestValidTime, chartOptions.maxDataSetLength);

      context.lineWidth = seriesOptions.lineWidth;
      context.strokeStyle = seriesOptions.strokeStyle;
      context.beginPath();
      var firstX = 0, lastX = 0, lastY = 0;
      for (var i = 0; i < dataSet.length && dataSet.length !== 1; i++) {
        var x = timeToXPixel(dataSet[i][0]),
            y = valueToYPixel(dataSet[i][1]);

        if (i === 0) {
          firstX = x;
          context.moveTo(x, y);
        } else {
          switch (chartOptions.interpolation) {
            case "linear":
            case "line": {
              context.lineTo(x,y);
              break;
            }
            case "bezier":
            default: {
              
              
              
              
              
              
              
              
              
              context.bezierCurveTo( 
                Math.round((lastX + x) / 2), lastY, 
                Math.round((lastX + x)) / 2, y, 
                x, y); 
              break;
            }
          }
        }

        lastX = x; lastY = y;
      }

      if (dataSet.length > 1) {
        if (seriesOptions.fillStyle) {
          
          context.lineTo(dimensions.width + seriesOptions.lineWidth + 1, lastY);
          context.lineTo(dimensions.width + seriesOptions.lineWidth + 1, dimensions.height + seriesOptions.lineWidth + 1);
          context.lineTo(firstX, dimensions.height + seriesOptions.lineWidth);
          context.fillStyle = seriesOptions.fillStyle;
          context.fill();
        }

        if (seriesOptions.strokeStyle && seriesOptions.strokeStyle !== 'none') {
          context.stroke();
        }
        context.closePath();
      }
      context.restore();
    }

    
    if (!chartOptions.labels.disabled && !isNaN(this.valueRange.min) && !isNaN(this.valueRange.max)) {
      var maxValueString = parseFloat(this.valueRange.max).toFixed(chartOptions.labels.precision),
          minValueString = parseFloat(this.valueRange.min).toFixed(chartOptions.labels.precision);
      context.fillStyle = chartOptions.labels.fillStyle;
      context.fillText(maxValueString, dimensions.width - context.measureText(maxValueString).width - 2, chartOptions.labels.fontSize);
      context.fillText(minValueString, dimensions.width - context.measureText(minValueString).width - 2, dimensions.height - 2);
    }

    context.restore(); 
  };

  
  SmoothieChart.timeFormatter = function(date) {
    function pad2(number) { return (number < 10 ? '0' : '') + number }
    return pad2(date.getHours()) + ':' + pad2(date.getMinutes()) + ':' + pad2(date.getSeconds());
  };

  exports.TimeSeries = TimeSeries;
  exports.SmoothieChart = SmoothieChart;

})(typeof exports === 'undefined' ?  this : exports);