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| /* The common DataWrapper 'interface' is validated via the tests
Note: it is not done as a superclass (as PitchMapper is below) because
there's really nothing in common implementation-wise; only the
interface is shared.
var DataWrapper = (function() {
function DataWrapper(data) {
throw Error('Please use a derived object.');
}
DataWrapper.prototype.num_series = function() {};
DataWrapper.prototype.series_names = function() {};
DataWrapper.prototype.series_min = function(series) {};
DataWrapper.prototype.series_max = function(series) {};
DataWrapper.prototype.series_value = function(series, index) {};
DataWrapper.prototype.series_length = function(series) {};
return DataWrapper;
})();*/
var GoogleDataWrapper = (function() {
function GoogleDataWrapper(data) {
this.data = data;
}
GoogleDataWrapper.prototype.num_series = function() {
return this.data.getNumberOfColumns() - 1;
};
GoogleDataWrapper.prototype.series_names = function() {
var results = [];
for (var i = 0; i < this.data.getNumberOfColumns() - 1; i++) {
results.push(this.data.getColumnLabel(i));
}
return results;
};
GoogleDataWrapper.prototype.series_min = function(series) {
return this.data.getColumnRange(series + 1).min;
};
GoogleDataWrapper.prototype.series_max = function(series) {
return this.data.getColumnRange(series + 1).max;
};
GoogleDataWrapper.prototype.series_value = function(series, index) {
return this.data.getValue(index, series + 1);
};
GoogleDataWrapper.prototype.series_length = function(series) {
return this.data.getNumberOfRows();
};
return GoogleDataWrapper;
})();
var JSONDataWrapper = (function() {
function JSONDataWrapper(json) {
if (typeof json === 'string') {
this.object = JSON.parse(json);
} else Eif (typeof json === 'object') {
this.object = json;
} else {
throw Error("Please provide a JSON string or derived object.");
}
}
JSONDataWrapper.prototype.num_series = function() {
return this.object.data.length;
};
JSONDataWrapper.prototype.series_names = function() {
var results = [];
for (var i = 0; i < this.object.data.length; i++) {
results.push(this.object.data[i].series);
}
return results;
};
JSONDataWrapper.prototype.series_min = function(series) {
return Math.min.apply(this, this.object.data[series].values);
};
JSONDataWrapper.prototype.series_max = function(series) {
return Math.max.apply(this, this.object.data[series].values);
};
JSONDataWrapper.prototype.series_value = function(series, index) {
return this.object.data[series].values[index];
};
JSONDataWrapper.prototype.series_length = function(series) {
return this.object.data[series].values.length;
};
return JSONDataWrapper;
})();
var HTMLTableDataWrapper = (function() {
function HTMLTableDataWrapper(table) {
this.table = table;
if (!this.table) {
throw Error("No table given.");
}
}
HTMLTableDataWrapper.prototype.num_series = function() {
return this.table.getElementsByTagName('tr')[0].children.length;
};
HTMLTableDataWrapper.prototype.series_names = function() {
var header_cells = this.table.getElementsByTagName('th');
var results = [];
for (var i = 0; i < header_cells.length; i++) {
results.push(header_cells[i].textContent);
}
return results;
};
HTMLTableDataWrapper.prototype._series_floats = function(series) {
var data_cells = this.table.getElementsByTagName('td');
var results = [];
for (var i = 0; i < data_cells.length; i++) {
results.push(parseFloat(data_cells[i].textContent));
}
return results;
};
HTMLTableDataWrapper.prototype.series_min = function(series) {
return Math.min.apply(this, this._series_floats(series));
};
HTMLTableDataWrapper.prototype.series_max = function(series) {
return Math.max.apply(this, this._series_floats(series));
};
HTMLTableDataWrapper.prototype.series_value = function(series, index) {
return parseFloat(this.table.getElementsByTagName('tr')[index + 1].children[series].textContent);
};
HTMLTableDataWrapper.prototype.series_length = function(series) {
return this.table.getElementsByTagName('tr').length - 1;
};
return HTMLTableDataWrapper;
})();
var PitchMapper = (function() {
function PitchMapper(minimum_datum, maximum_datum) {
this.minimum_datum = minimum_datum;
this.maximum_datum = maximum_datum;
if (this.minimum_datum > this.maximum_datum) {
throw Error('minimum datum should be <= maximum datum');
}
}
PitchMapper.prototype.map = function(datum) {}; // FIXME naming conflict?
return PitchMapper;
})();
var FrequencyPitchMapper = (function() {
function FrequencyPitchMapper(minimum_datum, maximum_datum, minimum_frequency, maximum_frequency) {
this.minimum_frequency = minimum_frequency;
this.maximum_frequency = maximum_frequency;
PitchMapper.call(this, minimum_datum, maximum_datum);
if (this.minimum_frequency > this.maximum_frequency) {
throw Error('minimum frequency should be <= maximum frequency');
}
this.data_range = this.maximum_datum - this.minimum_datum;
}
FrequencyPitchMapper.prototype = Object.create(PitchMapper.prototype);
FrequencyPitchMapper.prototype.constructor = FrequencyPitchMapper;
FrequencyPitchMapper.prototype.map = function(datum) {
var ratio;
if (this.data_range) {
ratio = (datum - this.minimum_datum) / this.data_range;
} else {
ratio = 0.5;
}
return this.minimum_frequency + ratio * (this.maximum_frequency - this.minimum_frequency);
};
return FrequencyPitchMapper;
})();
var NotePitchMapper = (function() {
function NotePitchMapper() {
return PitchMapper.apply(this, arguments);
}
NotePitchMapper.prototype = Object.create(PitchMapper.prototype);
NotePitchMapper.prototype.constructor = NotePitchMapper;
return NotePitchMapper;
})();
var WebAudioSounder = (function() {
function WebAudioSounder(context) {
this.context = context;
this.oscillator = this.context.createOscillator();
}
WebAudioSounder.prototype.start = function() {
this.oscillator.connect(this.context.destination);
this.oscillator.start(0);
};
WebAudioSounder.prototype.frequency = function(frequency, offset) {
var callback = (function(that) {
return function() {
that.oscillator.frequency.value = frequency;
};
})(this);
setTimeout(callback, offset);
};
WebAudioSounder.prototype.stop = function(offset) {
this.oscillator.stop(this.context.currentTime + offset);
};
return WebAudioSounder;
})();
var Player = (function() {
function Player(duration, data, pitch_mapper, sounder, visual_callback) {
this.data = data;
this.pitch_mapper = pitch_mapper;
this.sounder = sounder;
if (arguments.length < 5) {
this.visual_callback = null;
} else {
this.visual_callback = visual_callback;
}
this.interval = duration / this.data.series_length(0);
}
Player.prototype.play = function() {
var series_length = this.data.series_length(0);
var series_max_index = series_length - 1;
this.sounder.start(0);
if (this.visual_callback !== null) {
this.visual_callback(0, 0);
}
this.sounder.frequency(this.pitch_mapper.map(this.data.series_value(0, 0)));
for (var i = 1; i <= series_max_index; i++) {
var offset = this.interval * i;
if (this.visual_callback !== null) {
this._highlight_enqueue(0, i, offset);
}
this.sounder.frequency(this.pitch_mapper.map(this.data.series_value(0, i)), offset);
}
this.sounder.stop((series_length * this.interval) / 1000);
};
Player.prototype._highlight_enqueue = function(series, row, offset) {
var callback = (function(that) {
return function() {
that.visual_callback(series, row);
};
})(this);
setTimeout(callback, offset);
};
return Player;
})();
var AudioChart = (function() {
function AudioChart(options, context) {
var fail = "Sorry, your browser doesn't support the Web Audio API.";
if (arguments.length < 2) {
context = AudioContextGetter.get();
if (context === null) {
throw Error(fail);
}
}
return _AudioChart(options, context);
}
return AudioChart;
})();
var AudioContextGetter = (function() {
function AudioContextGetter() {}
var audio_context = null;
var _get_audio_context = function() {
Iif (window.AudioContext !== undefined) {
return new window.AudioContext();
} else Iif (window.webkitAudioContext !== undefined) {
return new window.webkitAudioContext();
} else {
return null;
}
};
AudioContextGetter.get = function() {
return audio_context !== null ? audio_context : audio_context = _get_audio_context();
};
return AudioContextGetter;
})();
var _AudioChart = (function() {
function _AudioChart(options, context) {
var data_wrapper, callback, frequency_pitch_mapper, sounder, player;
var result = _AudioChart._assign_wrapper_callback(options);
data_wrapper = new result.wrapper(result.parameter);
callback = result.callback;
frequency_pitch_mapper = new FrequencyPitchMapper(
data_wrapper.series_min(0),
data_wrapper.series_max(0),
options.frequency_low,
options.frequency_high
);
sounder = new WebAudioSounder(context);
player = new Player(
options.duration,
data_wrapper,
frequency_pitch_mapper,
sounder,
callback
);
player.play();
}
// This is being done as a sort of 'class/static method' because
// it doesn't need 'this'.
// http://stackoverflow.com/a/1635143
_AudioChart._assign_wrapper_callback = function(options) {
var result = {
'wrapper': null,
'parameter': null,
'callback': null
};
switch (options.type) {
case 'google':
result.wrapper = GoogleDataWrapper;
result.parameter = options.data;
if (options.hasOwnProperty('chart')) {
result.callback =
google_visual_callback_maker(options.chart);
}
break;
case 'json':
result.wrapper = JSONDataWrapper;
result.parameter = options.data;
break;
case 'html_table':
result.wrapper = HTMLTableDataWrapper;
result.parameter = options.table;
if (options.hasOwnProperty('highlight_class')) {
result.callback = html_table_visual_callback_maker(
options.table,
options.highlight_class
);
}
break;
default:
throw Error("Invalid data type '" + options.type + "' given.");
}
return result;
};
return _AudioChart;
})();
var google_visual_callback_maker = function(chart) {
return function(series, row) {
chart.setSelection([
{
'row': row,
'column': series + 1
}
]);
};
};
var html_table_visual_callback_maker = function(table, class_name) {
return function(series, row) {
var tds = table.getElementsByTagName('td');
for (var i = 0; i < tds.length; i++) {
cell = tds[i];
cell.className = '';
}
cell = table.getElementsByTagName('td')[row];
cell.className = class_name;
};
};
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