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restaurant-search/client/scripts/grapher.js

694 lines
22 KiB
JavaScript

/*
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.
*/
(function(grapher) {
'use strict';
//
// Coord
//
function Coord(x, y) {
this.x = x;
this.y = y;
}
//
// Rect
//
function Rect(left, top, width, height) {
this.left = left;
this.top = top;
this.width = width;
this.height = height;
this.right = left + width;
this.bottom = top + height;
this.contains = function(coord) {
var contained =
coord.x >= this.left &&
coord.x < this.right &&
coord.y >= this.top &&
coord.y < this.bottom;
return contained;
};
this.intersection = function(rect) {
var left = Math.max(this.left, rect.left);
var top = Math.max(this.top, rect.top);
var right = Math.min(this.right, rect.right);
var bottom = Math.min(this.bottom, rect.bottom);
return new Rect(left, top, right - left, bottom - top);
};
}
//
// Range
//
function Range(start, end) {
this.start = start;
this.end = end;
this.containsPoint = function(value) {
return value >= this.start && value <= this.end;
};
this.getLength = function() {
return this.end - this.start;
};
this.clamp = function(value) {
if (value < this.start) {
return this.start;
}
if (value > this.end) {
return this.end;
}
return value;
};
}
//
// 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);
this.labelBounds = this.getLabelBounds(this.columnBounds);
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.columnBounds.left,
top: this.columnBounds.top,
width: this.columnBounds.width,
height: this.columnBounds.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: 0.0,
x2: 0.0,
y2: this.hintRect.height,
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()
});
this.updateRect('handleRect', {
left: this.handleBounds.left,
top: this.handleBounds.top,
width: this.handleBounds.width,
height: this.handleBounds.height,
fill: this.getHandleColor()
});
if (final && this.range.containsPoint(0.0)) {
var y = this.getPosFromValue(0.0);
var p = [this.bounds.left, y, this.bounds.left + this.tickLength, y];
this.updateLine('baseline', p, {
stroke: this.tickColor
});
}
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, str, args) {
if (name in this) {
this[name].set(args);
}
else {
var text = new fabric.Text(str, args);
this.canvas.add(text);
this.shapes.push(text);
this[name] = text;
}
};
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;
}
};
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();
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;
for (var j = 0, count = this.hints.length; j < count; ++j) {
var hint = this.hints[j];
if (hint.sample > stepMin && hint.sample <= stepMax) {
hintCount += hint.count;
}
}
hintGroups.push(hintCount);
}
return hintGroups;
};
this.setClampedValue = function(value, final) {
this.value = this.range.clamp(value);
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 Rect(
bounds.left,
bounds.top + bounds.height,
bounds.width,
this.labelSize
);
};
this.getColumnBounds = function(bounds) {
return new Rect(
bounds.left + this.tickLength,
bounds.top,
bounds.width - this.tickLength,
bounds.height - this.labelSize
);
};
this.getHintBounds = function(bounds) {
return new Rect(
bounds.left + bounds.width - this.hintSize,
bounds.top,
this.hintSize,
bounds.height
);
};
this.getFillBounds = function(bounds) {
var y1 = this.getPosFromValue(0.0);
var y2 = this.getPosFromValue(this.value);
return new Rect(
bounds.left,
Math.min(y1, y2),
bounds.width - this.hintSize,
Math.abs(y1 - y2)
);
};
this.getHandleBounds = function(bounds, fillBounds) {
var handleBounds = new Rect(
fillBounds.left,
this.getPosFromValue(this.value) - this.handleSize / 2,
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);
};
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.y), true);
}
};
this.getValueFromPos = function(position) {
var percent = 1.0 - (position - this.columnBounds.top) / this.columnBounds.height;
return this.range.start + this.range.getLength() * percent;
};
this.getPosFromValue = function(value) {
var percent = 1.0 - (value - this.range.start) / this.range.getLength();
var range = new Range(this.columnBounds.top, this.columnBounds.top + this.columnBounds.height);
return range.clamp(this.columnBounds.top + this.columnBounds.height * 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.y) + 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.y) + this.dragDelta, true);
/* falls through */
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.y);
/* falls through */
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.desatOffset = -0.3;
this.hintSize = 10;
this.labelFontSize = 15;
this.labelSize = 20;
this.tickLength = 5;
this.emptyColor = '#eeeeec';
this.strokeColor = '#d3d7cf';
this.tickColor = '#888a85';
this.fillColorNeg = '#3465a4';
this.fillColorPos = '#cc0000';
this.handleColorNeg = '#204a87';
this.handleColorPos = '#a40000';
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
//
grapher.Grapher = function(canvas, range, columnWidth, useLocalScale, useRelativeScale) {
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);
}
var graphBounds = this.getGraphBounds(this.getCanvasBounds());
var index = 0;
var that = this;
_.each(columns, function(columnValue, columnName) {
if (useLocalScale) {
scale = that.getLocalScale(columnValue.hints);
}
var columnBounds = that.getColumnBounds(graphBounds, index);
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 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 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 width = this.columnWidth + this.padding * 2;
return new Rect(
bounds.left + width * index + this.padding,
bounds.top,
this.columnWidth,
bounds.height
);
};
this.getMousePos = function(e) {
var rect = e.target.getBoundingClientRect();
return new Coord(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.columnWidth = columnWidth;
this.canvas = new fabric.StaticCanvas(canvas);
this.range = new Range(range.min, range.max);
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;
};
}(window.grapher = window.grapher || {}));