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              <form id="chart_control" style="display:none">
	<div>
		<label for="offset">Offset (days):</label>
		<input id="offset" type="number" min="0" max="365" step="1" />
	</div>
	<div>
		<label for="scale">Scale (days):</label>
		<input id="scale" type="number" min="0" max="365" step="1" />
	</div>
	<div class="break">
		<label for="decay">Decay:</label>
		<input id="decay" type="number" min="0.000001" max="0.999999" step="0.000001" />
	</div>
	<div>
		<input type="submit" value="Update Graph" />
	</div>
</form>
<div class="break">
	<canvas id="chart" width="600" height="220"></canvas>
</div>
            
          
!
            
              body {
	font-family: 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
	font-size: 13px;
}
label, input {
	margin-bottom: 0.25em;
	width: 7em;
	display: block;
	float: left;
}
input[type="number"] {
	text-align: right;
}
input[type="submit"] {
	width: 10em;
}
form div {
	width: 14em;
	float: left;
}
div.break {
	clear: left;
}
.invalid {
	color: #d94f4f;
}
            
          
!
            
              ( function( w ) {
	var day_ms  = 86400000;

	var config = {
		origin : 365 * day_ms,  // 1971-01-01
		offset : 2419200000,    // 28 days
		scale  : 4838400000,    // 56 days
		decay  : 0.5
	};

	var scorer = {
		_distance: function( val ) {
			return Math.max( 0, Math.abs( val - config.origin ) - config.offset );
		},
		gauss: function( val ) {
			var segma_sq = -1 * Math.pow( config.scale, 2 ) / ( 2 * Math.log( config.decay ) );
			return Math.exp( -1 * ( Math.pow( scorer._distance( val ), 2 ) / ( 2 * segma_sq ) ) )
		},
		exp: function( val ) {
			var lambda = Math.log( config.decay ) / config.scale;
			return Math.exp( lambda * scorer._distance( val ) );
		},
		linear: function( val ) {
			var s = config.scale / ( 1 - config.decay );
			return Math.max( ( ( s - scorer._distance( val ) ) / s ), 0 );
		}
	}

	w.day_scorer = {
		set_configs: function( offset_days, scale_days, decay ) {
			config.offset = day_ms * offset_days;
			config.scale  = day_ms * scale_days;
			config.decay  = decay;
		},

		get_configs: function() {
			return {
				offset : config.offset / day_ms,
				scale  : config.scale / day_ms,
				decay  : config.decay,
			}
		},

		// Calc scores for range of days defaults to a year
		calc_days: function( first, last ) {
			// Origin is always last day of range
			config.origin = last * day_ms;

			var s = {
				gauss  : [],
				exp    : [],
				linear : []
			};

			for ( var d = first; d <= last; d++ ) {
				s.gauss.push( scorer.gauss( d * day_ms ) );
				s.exp.push( scorer.exp( d * day_ms ) );
				s.linear.push( scorer.linear( d * day_ms ) );
			}

			return s;
		}
	};
} )( window );

( function( w, d ) {
	// Set default chart configs
	Chart.defaults.global.responsive = true;
	Chart.defaults.global.scaleOverride = true;
	Chart.defaults.global.scaleSteps = 4;
	Chart.defaults.global.scaleStepWidth = 0.25;
	Chart.defaults.global.scaleStartValue = 0;
	Chart.defaults.global.tooltipXOffset = 0;
	Chart.defaults.global.multiTooltipTemplate = "<%= value.toFixed(3) %><%if (datasetLabel){%> - <%=datasetLabel%><%}%>";

	var first = 0,
		last = 365;

	var get_labels = function( all ) {
		var months = [ 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec' ];
		var labels = [];

		for ( var day = first; day <= last; day++ ) {
			var date = new Date( 86400000 * day );

			if ( all || date.getUTCDate() == 1 ) {
				labels.push( months[ date.getUTCMonth() ] + ' ' + date.getUTCDate() );
			} else {
				labels.push( '' );
			}
		}

		return labels;
	};

	var get_filler = function() {
		var filler = new Array( 1 + last - first );
		filler.fill( 0 );

		return filler;
	};

	var update_chart = function() {
		var scores = w.day_scorer.calc_days( first, last );
		var labels = get_labels( true );

		[ 'gauss', 'exp', 'linear' ].forEach( function( type, i ) {
			scores[ type ].forEach( function( s, j ) {
				graph.datasets[ i ].points[ j ].value = s;
				graph.datasets[ i ].points[ j ].label = labels[ j ];
			} );
		} );

		graph.update()
	}

	var graph = null,
		ctx = null,
		data = {
			labels: get_labels( false ),
			datasets: [
				{
					label: "gauss",
					fillColor: "rgba( 0, 135, 190, 0.05 )",
					strokeColor: "rgba( 0, 135, 190, 1 )",
					pointColor: "rgba( 0, 135, 190, 1)",
					data: get_filler()
				},
				{
					label: "exp",
					fillColor: "rgba( 213, 78, 33, 0.05 )",
					strokeColor: "rgba( 213, 78, 33, 1 )",
					pointColor: "rgba( 213, 78, 33, 1 )",
					data: get_filler()
				},
				{
					label: "linear",
					fillColor: "rgba( 168, 190, 206, 0.05 )",
					strokeColor: "rgba( 168, 190, 206, 1 )",
					pointColor: "rgba( 168, 190, 206, 1 )",
					data: get_filler()
				}
			]
		},
		options = {
			scaleShowVerticalLines: false,
			pointDot: false,
			pointHitDetectionRadius: 1
		},
		ids = {
			chart  : '',
			offset : '',
			scale  : '',
			decay  : ''
		};

	w.decay_chart = {
		init: function( chart_id, offset_id, scale_id, decay_id ) {
			// Store IDs
			ids = {
				chart  : chart_id,
				offset : offset_id,
				scale  : scale_id,
				decay  : decay_id
			}

			// Set UI to default values
			var configs = w.day_scorer.get_configs();
			d.getElementById( ids.offset ).value = configs.offset;
			d.getElementById( ids.scale ).value = configs.scale;
			d.getElementById( ids.decay ).value = configs.decay;

			ctx = d.getElementById( ids.chart ).getContext( "2d" );
			graph = new Chart( ctx ).Line( data, options );

			update_chart();
		},
		update: function() {
			// Check new values from UI
			var valid = true;
			[ ids.offset, ids.scale, ids.decay ].forEach( function( id ) {
				var elem = d.getElementById( id );
				if ( false == elem.validity.valid ) {
					valid = false;

					if ( 'function' == typeof elem.reportValidity ) {
						elem.reportValidity();
					}

					elem.className = "invalid";
				} else {
					elem.className = "";
				}
			} );

			if ( !valid ) {
				return;
			}

			w.day_scorer.set_configs(
				parseInt( d.getElementById( ids.offset ).value ),
				parseInt( d.getElementById( ids.scale ).value ),
				parseFloat( d.getElementById( ids.decay ).value )
			);

			update_chart();
		}
	}
} )( window, document );

window.onload = function() {
	var elem = document.getElementById( 'chart_control' );
	elem.addEventListener( 'submit', function( event ) {
		event.preventDefault();
		window.decay_chart.update();
	} );
	elem.style.display = '';

	window.decay_chart.init( 'chart', 'offset', 'scale', 'decay' );
}
            
          
!
999px
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