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/**
* @license
* Copyright 2012 Dan Vanderkam (danvdk@gmail.com)
* MIT-licensed (http://opensource.org/licenses/MIT)
*/
/*global Dygraph:false */
Dygraph.Plugins.Annotations = (function() {
"use strict";
/**
Current bits of jankiness:
- Uses dygraph.layout_ to get the parsed annotations.
- Uses dygraph.plotter_.area
It would be nice if the plugin didn't require so much special support inside
the core dygraphs classes, but annotations involve quite a bit of parsing and
layout.
TODO(danvk): cache DOM elements.
*/
var annotations = function() {
this.annotations_ = [];
};
annotations.prototype.toString = function() {
return "Annotations Plugin";
};
annotations.prototype.activate = function(g) {
return {
clearChart: this.clearChart,
didDrawChart: this.didDrawChart
};
};
annotations.prototype.detachLabels = function() {
for (var i = 0; i < this.annotations_.length; i++) {
var a = this.annotations_[i];
if (a.parentNode) a.parentNode.removeChild(a);
this.annotations_[i] = null;
}
this.annotations_ = [];
};
annotations.prototype.clearChart = function(e) {
this.detachLabels();
};
annotations.prototype.didDrawChart = function(e) {
var g = e.dygraph;
// Early out in the (common) case of zero annotations.
var points = g.layout_.annotated_points;
if (!points || points.length === 0) return;
var containerDiv = e.canvas.parentNode;
var annotationStyle = {
"position": "absolute",
"fontSize": g.getOption('axisLabelFontSize') + "px",
"zIndex": 10,
"overflow": "hidden"
};
var bindEvt = function(eventName, classEventName, pt) {
return function(annotation_event) {
var a = pt.annotation;
if (a.hasOwnProperty(eventName)) {
a[eventName](a, pt, g, annotation_event);
} else if (g.getOption(classEventName)) {
g.getOption(classEventName)(a, pt, g, annotation_event );
}
};
};
// Add the annotations one-by-one.
var area = e.dygraph.plotter_.area;
// x-coord to sum of previous annotation's heights (used for stacking).
var xToUsedHeight = {};
for (var i = 0; i < points.length; i++) {
var p = points[i];
if (p.canvasx < area.x || p.canvasx > area.x + area.w ||
p.canvasy < area.y || p.canvasy > area.y + area.h) {
continue;
}
var a = p.annotation;
var tick_height = 6;
if (a.hasOwnProperty("tickHeight")) {
tick_height = a.tickHeight;
}
var div = document.createElement("div");
for (var name in annotationStyle) {
if (annotationStyle.hasOwnProperty(name)) {
div.style[name] = annotationStyle[name];
}
}
if (!a.hasOwnProperty('icon')) {
div.className = "dygraphDefaultAnnotation";
}
if (a.hasOwnProperty('cssClass')) {
div.className += " " + a.cssClass;
}
var width = a.hasOwnProperty('width') ? a.width : 16;
var height = a.hasOwnProperty('height') ? a.height : 16;
if (a.hasOwnProperty('icon')) {
var img = document.createElement("img");
img.src = a.icon;
img.width = width;
img.height = height;
div.appendChild(img);
} else if (p.annotation.hasOwnProperty('shortText')) {
div.appendChild(document.createTextNode(p.annotation.shortText));
}
var left = p.canvasx - width / 2;
div.style.left = left + "px";
var divTop = 0;
if (a.attachAtBottom) {
var y = (area.y + area.h - height - tick_height);
if (xToUsedHeight[left]) {
y -= xToUsedHeight[left];
} else {
xToUsedHeight[left] = 0;
}
xToUsedHeight[left] += (tick_height + height);
divTop = y;
} else {
divTop = p.canvasy - height - tick_height;
}
div.style.top = divTop + "px";
div.style.width = width + "px";
div.style.height = height + "px";
div.title = p.annotation.text;
div.style.color = g.colorsMap_[p.name];
div.style.borderColor = g.colorsMap_[p.name];
a.div = div;
g.addAndTrackEvent(div, 'click',
bindEvt('clickHandler', 'annotationClickHandler', p, this));
g.addAndTrackEvent(div, 'mouseover',
bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p, this));
g.addAndTrackEvent(div, 'mouseout',
bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p, this));
g.addAndTrackEvent(div, 'dblclick',
bindEvt('dblClickHandler', 'annotationDblClickHandler', p, this));
containerDiv.appendChild(div);
this.annotations_.push(div);
var ctx = e.drawingContext;
ctx.save();
ctx.strokeStyle = g.colorsMap_[p.name];
ctx.beginPath();
if (!a.attachAtBottom) {
ctx.moveTo(p.canvasx, p.canvasy);
ctx.lineTo(p.canvasx, p.canvasy - 2 - tick_height);
} else {
var y = divTop + height;
ctx.moveTo(p.canvasx, y);
ctx.lineTo(p.canvasx, y + tick_height);
}
ctx.closePath();
ctx.stroke();
ctx.restore();
}
};
annotations.prototype.destroy = function() {
this.detachLabels();
};
return annotations;
})();
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