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restaurant-search/client/grapher.js

602 lines
18 KiB
JavaScript
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'use strict';
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.columnBounds = this.getColumnBounds(this.bounds);
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this.labelBounds = this.getLabelBounds(this.columnBounds);
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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', {
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left: this.columnBounds.left,
top: this.columnBounds.top,
width: this.columnBounds.width,
height: this.columnBounds.height,
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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: 0.0,
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x2: 0.0,
y2: this.hintRect.height,
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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.getFillColor()
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});
this.updateRect('handleRect', {
left: this.handleBounds.left,
top: this.handleBounds.top,
width: this.handleBounds.width,
height: this.handleBounds.height,
fill: this.getHandleColor()
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});
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if (final && goog.math.Range.containsPoint(this.range, 0.0)) {
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var y = this.getPosFromValue(0.0);
var p = [this.bounds.left, y, this.bounds.left + this.tickLength, y];
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this.updateLine('baseline', p, {
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stroke: this.tickColor
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});
}
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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;
}
}
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this.updateLine = function(name, points, args) {
if (name in this) {
this[name].set(args);
}
else {
var line = new fabric.Line(points, args);
this.canvas.add(line);
this.shapes.push(line);
this[name] = line;
}
}
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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 colorObj = tinycolor({ r: colorByte, g: colorByte, b: colorByte });
var colorStr = colorObj.toHexString();
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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,
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bounds.width,
this.labelSize
);
}
this.getColumnBounds = function(bounds) {
return new goog.math.Rect(
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bounds.left + this.tickLength,
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bounds.top,
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bounds.width - this.tickLength,
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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) {
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var y1 = this.getPosFromValue(0.0);
var y2 = this.getPosFromValue(this.value);
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return new goog.math.Rect(
bounds.left,
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Math.min(y1, y2),
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bounds.width - this.hintSize,
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Math.abs(y1 - y2)
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);
}
this.getHandleBounds = function(bounds, fillBounds) {
var handleBounds = new goog.math.Rect(
fillBounds.left,
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this.getPosFromValue(this.value) - this.handleSize / 2,
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fillBounds.width,
this.handleSize
);
handleBounds.intersection(bounds);
return handleBounds;
}
this.valueColorAdjust = function(color, offset) {
var colorObj = tinycolor(color);
var rangeEnd = this.value >= 0.0 ? this.range.end : this.range.start;
var rangeMid = (this.range.start + this.range.end) / 2.0;
var rangeRat = (this.value - rangeMid) / (rangeEnd - rangeMid);
var desatVal = Math.max(0.0, 1.0 - rangeRat + offset) * 100.0;
return colorObj.desaturate(desatVal).toHexString();
}
this.getFillColor = function() {
var color = this.value >= 0.0 ? this.fillColorPos : this.fillColorNeg;
return this.valueColorAdjust(color, this.desatOffset);
}
this.getHandleColor = function() {
var color = this.value >= 0.0 ? this.handleColorPos : this.handleColorNeg;
return this.valueColorAdjust(color, this.desatOffset);
}
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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)) {
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this.setClampedValue(this.getValueFromPos(position.y), true);
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}
}
this.getValueFromPos = function(position) {
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var percent = 1.0 - (position - this.columnBounds.top) / this.columnBounds.height;
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return this.range.start + this.range.getLength() * percent;
}
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this.getPosFromValue = function(value) {
var percent = 1.0 - (value - this.range.start) / this.range.getLength();
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return goog.math.clamp(
this.columnBounds.top + this.columnBounds.height * percent,
this.columnBounds.top,
this.columnBounds.top + this.columnBounds.height
);
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}
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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:
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this.setClampedValue(this.getValueFromPos(position.y) + this.dragDelta, false);
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break;
}
}
this.stateTransition = function(state, position) {
if (state == this.state) {
return;
}
switch (this.state) {
case this.State.DRAG:
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this.setClampedValue(this.getValueFromPos(position.y) + this.dragDelta, true);
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case this.State.HOVER:
if (state == this.State.NORMAL) {
this.canvas.contextContainer.canvas.style.cursor = 'default';
}
break;
}
switch (state) {
case this.State.DRAG:
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this.dragDelta = this.value - this.getValueFromPos(position.y);
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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;
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this.desatOffset = -0.3;
this.hintSize = 10;
this.labelFontSize = 15;
this.labelSize = 20;
this.tickLength = 5;
this.emptyColor = '#eeeeec';
this.strokeColor = '#d3d7cf';
this.tickColor = '#888a85';
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this.fillColorNeg = '#3465a4';
this.fillColorPos = '#cc0000';
this.handleColorNeg = '#204a87';
this.handleColorPos = '#a40000';
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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.updateShapes(true);
}
//
// Grapher
//
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function Grapher(canvas, range, columnWidth, useLocalScale, useRelativeScale) {
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this.setColumns = function(columns) {
this.clearColumns();
var scale = 0;
if (!useLocalScale) {
var hintData = {};
_.each(columns, function(columnValue, columnName) {
hintData[columnName] = columnValue.hints || [];
});
scale = this.getGlobalScale(hintData);
}
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var graphBounds = this.getGraphBounds(this.getCanvasBounds());
var index = 0;
var that = this;
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_.each(columns, function(columnValue, columnName) {
if (useLocalScale) {
scale = that.getLocalScale(columnValue.hints);
}
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var columnBounds = that.getColumnBounds(graphBounds, index);
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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) {
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var width = this.columnWidth + this.padding * 2;
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return new goog.math.Rect(
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bounds.left + width * index + this.padding,
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bounds.top,
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this.columnWidth,
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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;
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this.columnWidth = columnWidth;
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this.canvas = new fabric.StaticCanvas(canvas);
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this.range = new goog.math.Range(range.min, range.max);
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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;
}