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restaurant-search/client/js/grapher.js

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JavaScript
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(function(grapher) {
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'use strict';
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//
// Coord
//
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function Coord(x, y) {
this.x = x;
this.y = y;
}
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//
// Rect
//
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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;
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this.contains = function(coord) {
var contained =
coord.x >= this.left &&
coord.x < this.right &&
coord.y >= this.top &&
coord.y < this.bottom;
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return contained;
};
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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);
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return new Rect(left, top, right - left, bottom - top);
};
}
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//
// Range
//
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function Range(start, end) {
this.start = start;
this.end = end;
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this.containsPoint = function(value) {
return value >= this.start && value <= this.end;
};
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this.getLength = function() {
return this.end - this.start;
};
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this.clamp = function(value) {
if (value < this.start) {
return this.start;
}
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if (value > this.end) {
return this.end;
}
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return value;
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};
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}
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//
// Column
//
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function Column(canvas, name, params, scale, range, bounds) {
this.clearShapes = function() {
_.each(this.shapes, function(shape) {
this.canvas.remove(shape);
});
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this.shapes = [];
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};
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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',
});
}
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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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});
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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 && 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
});
}
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this.canvas.renderAll();
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};
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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;
}
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};
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this.updateText = function(name, str, args) {
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if (name in this) {
this[name].set(args);
}
else {
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var text = new fabric.Text(str, args);
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this.canvas.add(text);
this.shapes.push(text);
this[name] = text;
}
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};
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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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};
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this.decimateHints = function(steps, scale) {
var groups = this.groupHints(steps);
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var colorStops = {};
_.each(groups, function(count, index) {
var colorPercent = 0;
if (scale.getLength() > 0) {
colorPercent = Math.max(0, count - scale.start) / scale.getLength();
}
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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[index / steps] = colorStr;
});
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return colorStops;
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};
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this.groupHints = function(steps) {
var stepSize = this.range.getLength() / steps;
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var hintGroups = [];
for (var i = 0; i < steps; ++i) {
var stepMax = this.range.end - stepSize * i;
var stepMin = stepMax - stepSize;
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var hintCount = 0;
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for (var j = 0, count = this.hints.length; j < count; ++j) {
var hint = this.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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this.setClampedValue = function(value, final) {
this.value = this.range.clamp(value);
this.updateShapes(final);
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if (this.onValueChanged && final) {
this.onValueChanged(this.name, this.value);
}
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};
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this.setHints = function(hints, scale) {
this.hints = hints;
this.scale = scale;
this.updateShapes(true);
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};
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this.getLabelBounds = function(bounds) {
return new Rect(
bounds.left,
bounds.top + bounds.height,
bounds.width,
this.labelSize
);
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};
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this.getColumnBounds = function(bounds) {
return new Rect(
bounds.left + this.tickLength,
bounds.top,
bounds.width - this.tickLength,
bounds.height - this.labelSize
);
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};
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this.getHintBounds = function(bounds) {
return new Rect(
bounds.left + bounds.width - this.hintSize,
bounds.top,
this.hintSize,
bounds.height
);
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};
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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)
);
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};
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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;
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};
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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();
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};
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this.getFillColor = function() {
var color = this.value >= 0.0 ? this.fillColorPos : this.fillColorNeg;
return this.valueColorAdjust(color, this.desatOffset);
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};
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this.getHandleColor = function() {
var color = this.value >= 0.0 ? this.handleColorPos : this.handleColorNeg;
return this.valueColorAdjust(color, this.desatOffset);
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};
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this.mouseDown = function(position) {
if (this.isGrabbing(position)) {
this.stateTransition(this.State.DRAG, position);
}
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};
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this.mouseUp = function(position) {
this.stateTransition(
this.isHovering(position) ? this.State.HOVER : this.State.NORMAL,
position
);
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};
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this.mouseMove = function(position) {
switch (this.state) {
case this.State.NORMAL:
if (this.isHovering(position)) {
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this.stateTransition(this.State.HOVER, position);
}
break;
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case this.State.HOVER:
if (!this.isHovering(position)) {
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this.stateTransition(this.State.NORMAL, position);
}
break;
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}
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this.stateUpdate(position);
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};
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this.mouseOut = function(position) {
this.mouseUp(position);
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};
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this.mouseDoubleClick = function(position) {
if (this.isContained(position)) {
this.setClampedValue(this.getValueFromPos(position.y), true);
}
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};
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this.getValueFromPos = function(position) {
var percent = 1.0 - (position - this.columnBounds.top) / this.columnBounds.height;
return this.range.start + this.range.getLength() * percent;
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};
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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);
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};
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this.isHovering = function(position) {
return this.isGrabbing(position);
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};
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this.isGrabbing = function(position) {
return this.handleBounds.contains(position);
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};
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this.isContained = function(position) {
return this.columnBounds.contains(position);
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};
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this.stateUpdate = function(position) {
switch (this.state) {
case this.State.DRAG:
this.setClampedValue(this.getValueFromPos(position.y) + this.dragDelta, false);
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break;
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}
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};
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this.stateTransition = function(state, position) {
if (state == this.state) {
return;
}
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switch (this.state) {
case this.State.DRAG:
this.setClampedValue(this.getValueFromPos(position.y) + this.dragDelta, true);
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/* falls through */
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case this.State.HOVER:
if (state == this.State.NORMAL) {
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this.canvas.contextContainer.canvas.style.cursor = 'default';
}
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break;
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}
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switch (state) {
case this.State.DRAG:
this.dragDelta = this.value - this.getValueFromPos(position.y);
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/* falls through */
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case this.State.HOVER:
this.canvas.contextContainer.canvas.style.cursor = 'ns-resize';
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break;
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}
this.state = state;
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};
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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);
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}
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//
// Grapher
//
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grapher.Grapher = function(canvas, range, columnWidth, useLocalScale, useRelativeScale) {
this.setColumns = function(columns) {
this.clearColumns();
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var scale = 0;
if (!useLocalScale) {
var hintData = {};
_.each(columns, function(columnValue, columnName) {
hintData[columnName] = columnValue.hints || [];
});
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scale = this.getGlobalScale(hintData);
}
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var graphBounds = this.getGraphBounds(this.getCanvasBounds());
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var index = 0;
var that = this;
_.each(columns, function(columnValue, columnName) {
if (useLocalScale) {
scale = that.getLocalScale(columnValue.hints);
}
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var columnBounds = that.getColumnBounds(graphBounds, index);
that.columns.push(new Column(that.canvas, columnName, columnValue, scale, that.range, columnBounds));
that.indexMap[columnName] = index++;
});
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};
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this.clearColumns = function() {
_.each(this.columns, function(column) {
column.clearShapes();
});
this.columns = [];
this.indexMap = {};
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};
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this.setColumnHints = function(hintData) {
var scale = 0;
if (!this.useLocalScale) {
scale = this.getGlobalScale(hintData);
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}
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var that = this;
_.each(hintData, function(hints, name) {
var index = that.getColumnIndex(name);
console.assert(index >= 0);
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if (that.useLocalScale) {
scale = that.getLocalScale(hints);
}
that.columns[index].setHints(hints, scale);
});
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};
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this.setUseLocalScale = function(useLocalScale) {
if (useLocalScale != this.useLocalScale) {
this.useLocalScale = useLocalScale;
this.invalidateHints();
}
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};
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this.setUseRelativeScale = function(useRelativeScale) {
if (useRelativeScale != this.useRelativeScale) {
this.useRelativeScale = useRelativeScale;
this.invalidateHints();
}
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};
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this.invalidateHints = function() {
var hintData = {};
_.each(this.columns, function(column) {
hintData[column.name] = column.hints;
});
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this.setColumnHints(hintData);
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};
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this.setValueChangedListener = function(listener) {
_.each(this.columns, function(column) {
column.onValueChanged = listener;
});
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};
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this.getLocalScale = function(hints) {
var counts = _.pluck(hints, 'count');
var min = this.useRelativeScale ? _.min(counts) : 0;
return new Range(min, _.max(counts));
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};
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this.getGlobalScale = function(hintData) {
var that = this;
var globalScale = null;
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_.each(hintData, function(hints) {
var localScale = that.getLocalScale(hints);
if (globalScale) {
globalScale.includeRange(localScale);
}
else {
globalScale = localScale;
}
});
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return globalScale;
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};
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this.getColumnCount = function() {
return this.columns.length;
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};
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this.getColumnIndex = function(name) {
console.assert(name in this.indexMap);
return this.indexMap[name];
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};
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this.getColumnName = function(index) {
return this.columns[index].name;
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};
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this.getColumnNames = function() {
return _.pluck(this.columns, 'name');
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};
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this.getCanvasBounds = function() {
return new Rect(0, 0, this.canvas.width - 1, this.canvas.height - 1);
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};
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this.getGraphBounds = function(bounds) {
return this.getCanvasBounds();
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};
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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
);
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};
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this.getMousePos = function(e) {
var rect = e.target.getBoundingClientRect();
return new Coord(e.clientX - rect.left, e.clientY - rect.top);
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};
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this.mouseDown = function(e) {
var position = this.grapher.getMousePos(e);
_.each(this.grapher.columns, function(column) {
column.mouseDown(position);
});
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};
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this.mouseUp = function(e) {
var position = this.grapher.getMousePos(e);
_.each(this.grapher.columns, function(column) {
column.mouseUp(position);
});
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};
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this.mouseMove = function(e) {
var position = this.grapher.getMousePos(e);
_.each(this.grapher.columns, function(column) {
column.mouseMove(position);
});
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};
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this.mouseOut = function(e) {
var position = this.grapher.getMousePos(e);
_.each(this.grapher.columns, function(column) {
column.mouseOut(position);
});
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};
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this.mouseDoubleClick = function(e) {
var position = this.grapher.getMousePos(e);
_.each(this.grapher.columns, function(column) {
column.mouseDoubleClick(position);
});
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};
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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;
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};
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}(window.grapher = window.grapher || {}));