1
restaurant-search/client/grapher.js

559 lines
16 KiB
JavaScript
Raw Normal View History

2014-07-08 04:35:52 +00:00
'use strict';
goog.require('goog.color');
goog.require('goog.math');
goog.require('goog.math.Coordinate');
goog.require('goog.math.Range');
goog.require('goog.math.Rect');
//
// Column
//
function Column(canvas, name, params, scale, range, bounds) {
this.clearShapes = function() {
_.each(this.shapes, function(shape) {
this.canvas.remove(shape);
});
this.shapes = [];
}
this.updateShapes = function(final) {
this.labelBounds = this.getLabelBounds(this.bounds);
this.columnBounds = this.getColumnBounds(this.bounds);
this.hintBounds = this.getHintBounds(this.columnBounds);
this.fillBounds = this.getFillBounds(this.columnBounds);
this.handleBounds = this.getHandleBounds(this.columnBounds, this.fillBounds);
if (final) {
this.updateRect('boundsRect', {
left: this.bounds.left,
top: this.bounds.top,
width: this.bounds.width,
height: this.bounds.height,
stroke: this.strokeColor,
fill: this.emptyColor
});
this.updateRect('hintRect', {
left: this.hintBounds.left,
top: this.hintBounds.top,
width: this.hintBounds.width,
height: this.hintBounds.height,
stroke: this.strokeColor
});
this.hintRect.setGradient('fill', {
x1: 0.0,
y1: -this.hintRect.height / 2,
x2: 0.0,
y2: this.hintRect.height / 2,
colorStops: this.decimateHints(this.steps, this.scale)
});
this.updateRect('labelRect', {
left: this.labelBounds.left,
top: this.labelBounds.top,
width: this.labelBounds.width,
height: this.labelBounds.height,
fill: this.strokeColor
});
this.updateText('label', this.name, {
left: this.fillBounds.left + this.fillBounds.width / 2,
top: this.labelBounds.top + this.labelBounds.height / 2,
fontSize: this.labelFontSize,
originX: 'center',
originY: 'center',
});
}
this.updateRect('fillRect', {
left: this.fillBounds.left,
top: this.fillBounds.top,
width: this.fillBounds.width,
height: this.fillBounds.height,
fill: this.fillColor
});
this.updateRect('handleRect', {
left: this.handleBounds.left,
top: this.handleBounds.top,
width: this.handleBounds.width,
height: this.handleBounds.height,
fill: this.handleColor
});
this.canvas.renderAll();
}
this.updateRect = function(name, args) {
if (name in this) {
this[name].set(args);
}
else {
var rect = new fabric.Rect(args);
this.canvas.add(rect);
this.shapes.push(rect);
this[name] = rect;
}
}
this.updateText = function(name, text, args) {
if (name in this) {
this[name].set(args);
}
else {
var text = new fabric.Text(text, args);
this.canvas.add(text);
this.shapes.push(text);
this[name] = text;
}
}
this.updateColor = function(color) {
var fillColorRgb = goog.color.hexToRgb(goog.color.parse(color).hex);
var handleColorRgb = goog.color.darken(fillColorRgb, this.handleDarken);
this.fillColor = goog.color.rgbToHex.apply(this, fillColorRgb);
this.handleColor = goog.color.rgbToHex.apply(this, handleColorRgb);
}
this.decimateHints = function(steps, scale) {
var groups = this.groupHints(steps);
var colorStops = {};
_.each(groups, function(count, index) {
var colorPercent = 0;
if (scale.getLength() > 0) {
colorPercent = Math.max(0, count - scale.start) / scale.getLength();
}
var colorByte = 0xff - Math.min(0xff, Math.round(0xff * colorPercent));
var colorStr = goog.color.rgbToHex(colorByte, colorByte, colorByte);
colorStops[index / steps] = colorStr;
});
return colorStops;
}
this.groupHints = function(steps) {
var stepSize = this.range.getLength() / steps;
var hintGroups = [];
for (var i = 0; i < steps; ++i) {
var stepMax = this.range.end - stepSize * i;
var stepMin = stepMax - stepSize;
var hintCount = 0;
_.each(this.hints, function(hint) {
if (hint.sample > stepMin && hint.sample <= stepMax) {
hintCount += hint.count;
}
});
hintGroups.push(hintCount);
}
return hintGroups;
}
this.setClampedValue = function(value, final) {
this.value = goog.math.clamp(value, this.range.start, this.range.end);
this.updateShapes(final);
if (this.onValueChanged && final) {
this.onValueChanged(this.name, this.value);
}
}
this.setHints = function(hints, scale) {
this.hints = hints;
this.scale = scale;
this.updateShapes(true);
}
this.getLabelBounds = function(bounds) {
return new goog.math.Rect(
bounds.left,
bounds.top + bounds.height - this.labelSize,
bounds.width,
this.labelSize
);
}
this.getColumnBounds = function(bounds) {
return new goog.math.Rect(
bounds.left,
bounds.top,
bounds.width,
bounds.height - this.labelSize
);
}
this.getHintBounds = function(bounds) {
return new goog.math.Rect(
bounds.left + bounds.width - this.hintSize,
bounds.top,
this.hintSize,
bounds.height
);
}
this.getFillBounds = function(bounds) {
var fill = (this.value - this.range.start) / this.range.getLength();
var height = bounds.height * (1.0 - goog.math.clamp(fill, 0.0, 1.0));
return new goog.math.Rect(
bounds.left,
bounds.top + height,
bounds.width - this.hintSize,
bounds.height - height
);
}
this.getHandleBounds = function(bounds, fillBounds) {
var handleBounds = new goog.math.Rect(
fillBounds.left,
fillBounds.top,
fillBounds.width,
this.handleSize
);
handleBounds.intersection(bounds);
return handleBounds;
}
this.mouseDown = function(position) {
if (this.isGrabbing(position)) {
this.stateTransition(this.State.DRAG, position);
}
}
this.mouseUp = function(position) {
this.stateTransition(
this.isHovering(position) ? this.State.HOVER : this.State.NORMAL,
position
);
}
this.mouseMove = function(position) {
switch (this.state) {
case this.State.NORMAL:
if (this.isHovering(position)) {
this.stateTransition(this.State.HOVER, position);
}
break;
case this.State.HOVER:
if (!this.isHovering(position)) {
this.stateTransition(this.State.NORMAL, position);
}
break;
}
this.stateUpdate(position);
}
this.mouseOut = function(position) {
this.mouseUp(position);
}
this.mouseDoubleClick = function(position) {
if (this.isContained(position)) {
this.setClampedValue(this.getValueFromPos(position), true);
}
}
this.getValueFromPos = function(position) {
var percent = 1.0 - (position.y - this.columnBounds.top) / this.columnBounds.height;
return this.range.start + this.range.getLength() * percent;
}
this.isHovering = function(position) {
return this.isGrabbing(position);
}
this.isGrabbing = function(position) {
return this.handleBounds.contains(position);
}
this.isContained = function(position) {
return this.columnBounds.contains(position);
}
this.stateUpdate = function(position) {
switch (this.state) {
case this.State.DRAG:
this.setClampedValue(this.getValueFromPos(position) + this.dragDelta, false);
break;
}
}
this.stateTransition = function(state, position) {
if (state == this.state) {
return;
}
switch (this.state) {
case this.State.DRAG:
this.setClampedValue(this.getValueFromPos(position) + this.dragDelta, true);
case this.State.HOVER:
if (state == this.State.NORMAL) {
this.canvas.contextContainer.canvas.style.cursor = 'default';
}
break;
}
switch (state) {
case this.State.DRAG:
this.dragDelta = this.value - this.getValueFromPos(position);
case this.State.HOVER:
this.canvas.contextContainer.canvas.style.cursor = 'ns-resize';
break;
}
this.state = state;
}
this.State = {
NORMAL: 0,
HOVER: 1,
DRAG: 2
};
this.handleSize = 10;
this.handleDarken = 0.25;
this.hintSize = 10;
this.labelFontSize = 15;
this.labelSize = 20;
this.emptyColor = '#eeeeec';
this.strokeColor = '#d3d7cf';
this.canvas = canvas;
this.shapes = [];
this.name = name;
this.value = params.value;
this.hints = params.hints;
this.steps = params.steps;
this.scale = scale;
this.range = range;
this.bounds = bounds;
this.state = this.State.NORMAL;
this.updateColor(params.color);
this.updateShapes(true);
}
//
// Grapher
//
function Grapher(canvas, range, useLocalScale, useRelativeScale) {
this.setColumns = function(columns) {
this.clearColumns();
var graphBounds = this.getGraphBounds(this.getCanvasBounds());
var columnCount = _.keys(columns).length;
var scale = 0;
if (!useLocalScale) {
var hintData = {};
_.each(columns, function(columnValue, columnName) {
hintData[columnName] = columnValue.hints || [];
});
scale = this.getGlobalScale(hintData);
}
var index = 0;
var that = this;
_.each(columns, function(columnValue, columnName) {
if (useLocalScale) {
scale = that.getLocalScale(columnValue.hints);
}
var columnBounds = that.getColumnBounds(graphBounds, index, columnCount);
that.columns.push(new Column(that.canvas, columnName, columnValue, scale, that.range, columnBounds));
that.indexMap[columnName] = index++;
});
}
this.clearColumns = function() {
_.each(this.columns, function(column) {
column.clearShapes();
});
this.columns = [];
this.indexMap = {};
}
this.setColumnHints = function(hintData) {
var scale = 0;
if (!this.useLocalScale) {
scale = this.getGlobalScale(hintData);
}
var that = this;
_.each(hintData, function(hints, name) {
var index = that.getColumnIndex(name);
console.assert(index >= 0);
if (that.useLocalScale) {
scale = that.getLocalScale(hints);
}
that.columns[index].setHints(hints, scale);
});
}
this.setUseLocalScale = function(useLocalScale) {
if (useLocalScale != this.useLocalScale) {
this.useLocalScale = useLocalScale;
this.invalidateHints();
}
}
this.setUseRelativeScale = function(useRelativeScale) {
if (useRelativeScale != this.useRelativeScale) {
this.useRelativeScale = useRelativeScale;
this.invalidateHints();
}
}
this.invalidateHints = function() {
var hintData = {};
_.each(this.columns, function(column) {
hintData[column.name] = column.hints;
});
this.setColumnHints(hintData);
}
this.setValueChangedListener = function(listener) {
_.each(this.columns, function(column) {
column.onValueChanged = listener;
});
}
this.getLocalScale = function(hints) {
var counts = _.pluck(hints, 'count');
var min = this.useRelativeScale ? _.min(counts) : 0;
return new goog.math.Range(min, _.max(counts));
}
this.getGlobalScale = function(hintData) {
var that = this;
var globalScale = null;
_.each(hintData, function(hints) {
var localScale = that.getLocalScale(hints);
if (globalScale) {
globalScale.includeRange(localScale);
}
else {
globalScale = localScale;
}
});
return globalScale;
}
this.getColumnCount = function() {
return this.columns.length;
}
this.getColumnIndex = function(name) {
console.assert(name in this.indexMap);
return this.indexMap[name];
}
this.getColumnName = function(index) {
return this.columns[index].name;
}
this.getColumnNames = function() {
return _.pluck(this.columns, 'name');
}
this.getCanvasBounds = function() {
return new goog.math.Rect(0, 0, this.canvas.width - 1, this.canvas.height - 1);
}
this.getGraphBounds = function(bounds) {
return this.getCanvasBounds();
}
this.getColumnBounds = function(bounds, index, count) {
var secWidth = bounds.width / count;
var columnWidth = secWidth - this.padding * 2;
return new goog.math.Rect(
bounds.left + secWidth * index + this.padding,
bounds.top,
columnWidth,
bounds.height
);
}
this.getMousePos = function(e) {
var rect = e.target.getBoundingClientRect();
return new goog.math.Coordinate(
e.clientX - rect.left,
e.clientY - rect.top
);
}
this.mouseDown = function(e) {
var position = this.grapher.getMousePos(e);
_.each(this.grapher.columns, function(column) {
column.mouseDown(position);
});
}
this.mouseUp = function(e) {
var position = this.grapher.getMousePos(e);
_.each(this.grapher.columns, function(column) {
column.mouseUp(position);
});
}
this.mouseMove = function(e) {
var position = this.grapher.getMousePos(e);
_.each(this.grapher.columns, function(column) {
column.mouseMove(position);
});
}
this.mouseOut = function(e) {
var position = this.grapher.getMousePos(e);
_.each(this.grapher.columns, function(column) {
column.mouseOut(position);
});
}
this.mouseDoubleClick = function(e) {
var position = this.grapher.getMousePos(e);
_.each(this.grapher.columns, function(column) {
column.mouseDoubleClick(position);
});
}
this.useLocalScale = useLocalScale;
this.useRelativeScale = useRelativeScale;
this.canvas = new fabric.StaticCanvas(canvas);
this.range = range;
this.padding = 10;
this.indexMap = {};
this.columns = [];
var c = this.canvas.contextContainer.canvas;
c.addEventListener('mousedown', this.mouseDown, false);
c.addEventListener('mouseup', this.mouseUp, false);
c.addEventListener('mousemove', this.mouseMove, false);
c.addEventListener('mouseout', this.mouseOut, false);
c.addEventListener('dblclick', this.mouseDoubleClick, false);
c.grapher = this;
}