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restaurant-search/client/scripts/grapher.js

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/*
The MIT License (MIT)
Copyright (c) 2014 Alex Yatskov
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
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(function(grapher) {
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'use strict';
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//
// Range
//
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function Range(min, max) {
this.min = Math.min(min, max);
this.max = Math.max(min, max);
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this.contains = function(value) {
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return value >= this.min && value <= this.max;
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};
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this.length = function() {
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return this.max - this.min;
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};
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this.clamp = function(value) {
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if (value < this.min) {
return this.min;
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}
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if (value > this.max) {
return this.max;
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}
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return value;
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};
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this.include = function(range) {
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this.min = Math.min(this.min, range.min);
this.max = Math.max(this.max, range.max);
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};
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this.offset = function(value) {
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return (value - this.min) / this.length();
};
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this.project = function(value) {
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return this.min + this.length() * value;
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};
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}
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//
// Column
//
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function Column(params) {
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var _backdropColor = '#eeeeec';
var _borderColor = '#babdb6';
var _fillColorNeg = '#3465a4';
var _fillColorPos = '#cc0000';
var _panelColor = '#babdb6';
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var _tickColor = '#888a85';
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var _densitySize = 10;
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var _desatOffset = -0.3;
var _height = 500;
var _padding = 10;
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var _panelSize = 20;
var _tickSize = 5;
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var _width = 110;
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var _easeTime = 400;
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var _animation = null;
var _canvas = params.canvas;
var _data = params.data;
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var _index = params.index;
var _name = params.name;
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var _valueAnimated = params.data.value;
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var _onValueChanged = params.onValueChanged;
var _range = params.range;
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var _scale = params.scale;
var _steps = params.steps;
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var _elements = {};
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function createShapes() {
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// backdrop
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_elements.backdrop = _canvas.rect(
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_tickSize, 0, _width - (_densitySize + _tickSize), _height - _panelSize
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).attr({cursor: 'crosshair', stroke: _borderColor, fill: _backdropColor}).click(clicked);
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// density
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_elements.density = _canvas.rect(
_width - _densitySize, 0, _densitySize, _height - _panelSize
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).attr({stroke: _borderColor});
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// panel
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_elements.panel = _canvas.rect( _tickSize,
_height - _panelSize, _width - _tickSize, _panelSize
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).attr({fill: _panelColor});
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// label
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_elements.label = _canvas.text(
_tickSize + (_width - _tickSize) / 2, _height - _panelSize / 2, _name
).attr({'dominant-baseline': 'middle', 'text-anchor': 'middle'});
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// indicator
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var range = computeIndicatorRange(_data.value);
_elements.indicator = _canvas.rect(
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_tickSize, range.min, _width - (_densitySize + _tickSize), (range.max - range.min)
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).attr({cursor: 'crosshair', fill: computeIndicatorColor(_data.value)}).click(clicked);
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// tick
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if (_range.contains(0.0)) {
var origin = valueToIndicator(0.0);
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_elements.tick = _canvas.line(0, origin, _width - _densitySize, origin
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).attr({stroke: _tickColor});
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}
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_elements.group = _canvas.group(
_elements.backdrop,
_elements.indicator,
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_elements.density,
_elements.panel,
_elements.tick,
_elements.label
);
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_elements.group.transform(
Snap.format('t{x},{y}', {x: _index * (_width + _padding), y: 0})
);
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updateDensity();
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}
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function updateIndicator(value) {
var range = computeIndicatorRange(value);
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_elements.indicator.attr({
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y: range.min,
height: range.max - range.min,
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fill: computeIndicatorColor(value)
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});
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_valueAnimated = value;
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}
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function updateDensity() {
var fill = _data.hints.length === 0 ? _backdropColor : _canvas.gradient(decimateHints());
_elements.density.attr({ fill: fill });
}
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function decimateHints() {
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var colorStops = 'l(0,0,0,1)';
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var groups = groupHints();
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for (var i = 0, count = groups.length; i < count; ++i) {
var groupSize = groups[i];
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var colorPercent = 0;
if (_scale.length() > 0) {
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colorPercent = Math.max(0, groupSize - _scale.min) / _scale.length();
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}
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var colorByte = 0xff - Math.min(0xff, Math.round(0xff * colorPercent));
var colorObj = tinycolor({ r: colorByte, g: colorByte, b: colorByte });
var colorStr = colorObj.toHexString();
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colorStops += colorStr;
if (i + 1 < count) {
colorStops += '-';
}
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}
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return colorStops;
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}
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function groupHints() {
var stepSize = _range.length() / _steps;
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var hintGroups = [];
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for (var i = 0; i < _steps; ++i) {
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var stepMax = _range.max - stepSize * i;
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var stepMin = stepMax - stepSize;
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var hintCount = 0;
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for (var j = 0, count = _data.hints.length; j < count; ++j) {
var hint = _data.hints[j];
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if (hint.sample > stepMin && hint.sample <= stepMax) {
hintCount += hint.count;
}
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}
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hintGroups.push(hintCount);
}
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return hintGroups;
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}
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function updateValue(value) {
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_data.value = _range.clamp(value);
if (_onValueChanged) {
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_onValueChanged(_name, _data.value);
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}
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animateIndicator(_valueAnimated, _data.value);
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}
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function animateIndicator(valueOld, valueNew) {
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if (valueOld === valueNew) {
return;
}
if (_animation !== null) {
_animation.stop();
}
_animation = Snap.animate(
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valueOld,
valueNew,
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function(value) {
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updateIndicator(value);
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},
_easeTime,
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mina.easeinout,
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function() {
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_animation = null;
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}
);
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}
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function valueColorAdjust(value, color, offset) {
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var colorObj = tinycolor(color);
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var rangeEnd = value >= 0.0 ? _range.max : _range.min;
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var rangeMid = (_range.min + _range.max) / 2.0;
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var rangeRat = (value - rangeMid) / (rangeEnd - rangeMid);
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var desatVal = Math.max(0.0, 1.0 - rangeRat + offset) * 100.0;
return colorObj.desaturate(desatVal).toHexString();
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}
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function computeIndicatorColor(value) {
var color = value >= 0.0 ? _fillColorPos : _fillColorNeg;
return valueColorAdjust(value, color, _desatOffset);
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}
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function computeIndicatorRange(value) {
return new Range(valueToIndicator(0.0), valueToIndicator(value));
}
function valueToIndicator(scalar) {
var box = _elements.backdrop.getBBox();
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var offset = _range.offset(scalar);
return box.y + box.height * (1.0 - offset);
}
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function indicatorToValue(scalar) {
var box = _elements.backdrop.getBBox();
var range = new Range(box.y, box.y + box.height);
return -_range.project(range.offset(scalar));
}
function clicked(event, x, y) {
var rect = _canvas.node.getBoundingClientRect();
updateValue(indicatorToValue(y - rect.top));
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}
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this.update = function(data, scale) {
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_scale = scale;
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if (_.has(data, 'value')) {
_data.value = data.value;
animateIndicator(_valueAnimated, _data.value);
}
if (_.has(data, 'hints')) {
_data.hints = data.hints;
updateDensity();
}
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};
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createShapes();
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}
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//
// Grapher
//
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grapher.Grapher = function(params) {
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var _canvas = params.canvas;
var _columns = {};
var _data = {};
var _range = new Range(params.range.min || -1.0, params.range.max || 1.0);
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var _steps = params.steps || 20;
var _useLocalScale = params.useLocalScale || true;
var _useRelativeScale = params.useRelativeScale || true;
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var _onValueChanged = params.onValueChanged;
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function computeLocalScale(hints) {
var counts = _.pluck(hints, 'count');
var min = _useRelativeScale ? _.min(counts) : 0;
return new Range(min, _.max(counts));
}
function computeGlobalScale(hintData) {
var globalScale = null;
for (var i = 0, count = hintData.length; i < count; ++i) {
var localScale = computeLocalScale(hintData[i]);
if (globalScale) {
globalScale.include(localScale);
}
else {
globalScale = localScale;
}
}
return globalScale;
}
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this.setColumns = function(columns) {
var scale = 0;
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if (!_useLocalScale) {
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var hintData = _.pluck(columns, 'hints');
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scale = computeGlobalScale(hintData);
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}
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var index = 0;
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for (var name in columns) {
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var data = _data[name] = columns[name];
if (_useLocalScale) {
scale = computeLocalScale(data.hints);
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}
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var column = _columns[name];
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if (column) {
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column.update(data, scale);
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}
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else {
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_columns[name] = new Column({
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onValueChanged: _onValueChanged,
steps: _steps,
range: _range,
canvas: _canvas,
data: data,
name: name,
scale: scale,
index: index++,
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});
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}
}
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};
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this.setUseLocalScale = function(useLocalScale) {
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if (useLocalScale != _useLocalScale) {
_useLocalScale = useLocalScale;
this.setColumns(_data);
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}
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};
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this.setUseRelativeScale = function(useRelativeScale) {
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if (useRelativeScale != _useRelativeScale) {
_useRelativeScale = useRelativeScale;
this.setColumns(_data);
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}
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};
};
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}(window.grapher = window.grapher || {}));