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( function( w ) { |
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var day_ms = 86400000; |
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|
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var config = { |
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origin : 365 * day_ms, // 1971-01-01 |
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offset : 2419200000, // 28 days |
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scale : 4838400000, // 56 days |
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decay : 0.5 |
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}; |
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|
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var scorer = { |
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_distance: function( val ) { |
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return Math.max( 0, Math.abs( val - config.origin ) - config.offset ); |
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}, |
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gauss: function( val ) { |
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var segma_sq = -1 * Math.pow( config.scale, 2 ) / ( 2 * Math.log( config.decay ) ); |
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return Math.exp( -1 * ( Math.pow( scorer._distance( val ), 2 ) / ( 2 * segma_sq ) ) ) |
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}, |
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exp: function( val ) { |
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var lambda = Math.log( config.decay ) / config.scale; |
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return Math.exp( lambda * scorer._distance( val ) ); |
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}, |
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linear: function( val ) { |
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var s = config.scale / ( 1 - config.decay ); |
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return Math.max( ( ( s - scorer._distance( val ) ) / s ), 0 ); |
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} |
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} |
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|
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w.day_scorer = { |
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set_configs: function( offset_days, scale_days, decay ) { |
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config.offset = day_ms * offset_days; |
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config.scale = day_ms * scale_days; |
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config.decay = decay; |
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}, |
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|
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get_configs: function() { |
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return { |
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offset : config.offset / day_ms, |
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scale : config.scale / day_ms, |
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decay : config.decay, |
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} |
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}, |
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|
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// Calc scores for range of days defaults to a year |
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calc_days: function( first, last ) { |
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// Origin is always last day of range |
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config.origin = last * day_ms; |
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|
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var s = { |
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gauss : [], |
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exp : [], |
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linear : [] |
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}; |
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|
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for ( var d = first; d <= last; d++ ) { |
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s.gauss.push( scorer.gauss( d * day_ms ) ); |
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s.exp.push( scorer.exp( d * day_ms ) ); |
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s.linear.push( scorer.linear( d * day_ms ) ); |
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} |
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|
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return s; |
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} |
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}; |
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} )( window ); |
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|
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( function( w, d ) { |
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// Set default chart configs |
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Chart.defaults.global.responsive = true; |
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Chart.defaults.global.scaleOverride = true; |
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Chart.defaults.global.scaleSteps = 4; |
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Chart.defaults.global.scaleStepWidth = 0.25; |
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Chart.defaults.global.scaleStartValue = 0; |
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Chart.defaults.global.tooltipXOffset = 0; |
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Chart.defaults.global.multiTooltipTemplate = "<%= value.toFixed(3) %><%if (datasetLabel){%> - <%=datasetLabel%><%}%>"; |
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|
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var first = 0, |
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last = 365; |
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|
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var get_labels = function( all ) { |
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var months = [ 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec' ]; |
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var labels = []; |
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|
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for ( var day = first; day <= last; day++ ) { |
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var date = new Date( 86400000 * day ); |
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|
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if ( all || date.getUTCDate() == 1 ) { |
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labels.push( months[ date.getUTCMonth() ] + ' ' + date.getUTCDate() ); |
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} else { |
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labels.push( '' ); |
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} |
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} |
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return labels; |
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}; |
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|
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var get_filler = function() { |
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var filler = new Array( 1 + last - first ); |
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filler.fill( 0 ); |
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|
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return filler; |
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}; |
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|
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var update_chart = function() { |
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var scores = w.day_scorer.calc_days( first, last ); |
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var labels = get_labels( true ); |
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|
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[ 'gauss', 'exp', 'linear' ].forEach( function( type, i ) { |
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scores[ type ].forEach( function( s, j ) { |
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graph.datasets[ i ].points[ j ].value = s; |
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graph.datasets[ i ].points[ j ].label = labels[ j ]; |
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} ); |
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} ); |
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|
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graph.update() |
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} |
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|
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var graph = null, |
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ctx = null, |
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data = { |
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labels: get_labels( false ), |
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datasets: [ |
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{ |
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label: "gauss", |
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fillColor: "rgba( 0, 135, 190, 0.05 )", |
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strokeColor: "rgba( 0, 135, 190, 1 )", |
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pointColor: "rgba( 0, 135, 190, 1)", |
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data: get_filler() |
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}, |
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{ |
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label: "exp", |
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fillColor: "rgba( 213, 78, 33, 0.05 )", |
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strokeColor: "rgba( 213, 78, 33, 1 )", |
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pointColor: "rgba( 213, 78, 33, 1 )", |
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data: get_filler() |
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}, |
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{ |
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label: "linear", |
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fillColor: "rgba( 168, 190, 206, 0.05 )", |
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strokeColor: "rgba( 168, 190, 206, 1 )", |
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pointColor: "rgba( 168, 190, 206, 1 )", |
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data: get_filler() |
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} |
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] |
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}, |
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options = { |
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scaleShowVerticalLines: false, |
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pointDot: false, |
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pointHitDetectionRadius: 1 |
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}, |
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ids = { |
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chart : '', |
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offset : '', |
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scale : '', |
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decay : '' |
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}; |
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|
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w.decay_chart = { |
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init: function( chart_id, offset_id, scale_id, decay_id ) { |
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// Store IDs |
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ids = { |
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chart : chart_id, |
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offset : offset_id, |
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scale : scale_id, |
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decay : decay_id |
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} |
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|
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// Set UI to default values |
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var configs = w.day_scorer.get_configs(); |
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d.getElementById( ids.offset ).value = configs.offset; |
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d.getElementById( ids.scale ).value = configs.scale; |
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d.getElementById( ids.decay ).value = configs.decay; |
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|
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ctx = d.getElementById( ids.chart ).getContext( "2d" ); |
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graph = new Chart( ctx ).Line( data, options ); |
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|
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update_chart(); |
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}, |
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update: function() { |
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// Check new values from UI |
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var valid = true; |
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[ ids.offset, ids.scale, ids.decay ].forEach( function( id ) { |
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var elem = d.getElementById( id ); |
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if ( false == elem.validity.valid ) { |
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valid = false; |
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|
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if ( 'function' == typeof elem.reportValidity ) { |
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elem.reportValidity(); |
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} |
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|
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elem.className = "invalid"; |
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} else { |
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elem.className = ""; |
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} |
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} ); |
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|
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if ( !valid ) { |
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return; |
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} |
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|
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w.day_scorer.set_configs( |
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parseInt( d.getElementById( ids.offset ).value ), |
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parseInt( d.getElementById( ids.scale ).value ), |
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parseFloat( d.getElementById( ids.decay ).value ) |
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); |
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|
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update_chart(); |
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} |
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} |
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} )( window, document ); |
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|
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window.onload = function() { |
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var elem = document.getElementById( 'chart_control' ); |
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elem.addEventListener( 'submit', function( event ) { |
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event.preventDefault(); |
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window.decay_chart.update(); |
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} ); |
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elem.style.display = ''; |
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|
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window.decay_chart.init( 'chart', 'offset', 'scale', 'decay' ); |
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} |
