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/**
* @license
* Copyright 2012 Dan Vanderkam (danvdk@gmail.com)
* MIT-licensed (http://opensource.org/licenses/MIT)
*/
/*global Dygraph:false */
Dygraph.Plugins.ChartLabels = (function() {
"use strict";
// TODO(danvk): move chart label options out of dygraphs and into the plugin.
// TODO(danvk): only tear down & rebuild the DIVs when it's necessary.
var chart_labels = function() {
this.title_div_ = null;
this.xlabel_div_ = null;
this.ylabel_div_ = null;
this.y2label_div_ = null;
};
chart_labels.prototype.toString = function() {
return "ChartLabels Plugin";
};
chart_labels.prototype.activate = function(g) {
return {
layout: this.layout,
// clearChart: this.clearChart,
didDrawChart: this.didDrawChart
};
};
// QUESTION: should there be a plugin-utils.js?
var createDivInRect = function(r) {
var div = document.createElement('div');
div.style.position = 'absolute';
div.style.left = r.x + 'px';
div.style.top = r.y + 'px';
div.style.width = r.w + 'px';
div.style.height = r.h + 'px';
return div;
};
// Detach and null out any existing nodes.
chart_labels.prototype.detachLabels_ = function() {
var els = [ this.title_div_,
this.xlabel_div_,
this.ylabel_div_,
this.y2label_div_ ];
for (var i = 0; i < els.length; i++) {
var el = els[i];
if (!el) continue;
if (el.parentNode) el.parentNode.removeChild(el);
}
this.title_div_ = null;
this.xlabel_div_ = null;
this.ylabel_div_ = null;
this.y2label_div_ = null;
};
var createRotatedDiv = function(g, box, axis, classes, html) {
// TODO(danvk): is this outer div actually necessary?
var div = document.createElement("div");
div.style.position = 'absolute';
if (axis == 1) {
// NOTE: this is cheating. Should be positioned relative to the box.
div.style.left = '0px';
} else {
div.style.left = box.x + 'px';
}
div.style.top = box.y + 'px';
div.style.width = box.w + 'px';
div.style.height = box.h + 'px';
div.style.fontSize = (g.getOption('yLabelWidth') - 2) + 'px';
var inner_div = document.createElement("div");
inner_div.style.position = 'absolute';
inner_div.style.width = box.h + 'px';
inner_div.style.height = box.w + 'px';
inner_div.style.top = (box.h / 2 - box.w / 2) + 'px';
inner_div.style.left = (box.w / 2 - box.h / 2) + 'px';
inner_div.style.textAlign = 'center';
// CSS rotation is an HTML5 feature which is not standardized. Hence every
// browser has its own name for the CSS style.
var val = 'rotate(' + (axis == 1 ? '-' : '') + '90deg)';
inner_div.style.transform = val; // HTML5
inner_div.style.WebkitTransform = val; // Safari/Chrome
inner_div.style.MozTransform = val; // Firefox
inner_div.style.OTransform = val; // Opera
inner_div.style.msTransform = val; // IE9
if (typeof(document.documentMode) !== 'undefined' &&
document.documentMode < 9) {
// We're dealing w/ an old version of IE, so we have to rotate the text
// using a BasicImage transform. This uses a different origin of rotation
// than HTML5 rotation (top left of div vs. its center).
inner_div.style.filter =
'progid:DXImageTransform.Microsoft.BasicImage(rotation=' +
(axis == 1 ? '3' : '1') + ')';
inner_div.style.left = '0px';
inner_div.style.top = '0px';
}
var class_div = document.createElement("div");
class_div.className = classes;
class_div.innerHTML = html;
inner_div.appendChild(class_div);
div.appendChild(inner_div);
return div;
};
chart_labels.prototype.layout = function(e) {
this.detachLabels_();
var g = e.dygraph;
var div = e.chart_div;
if (g.getOption('title')) {
// QUESTION: should this return an absolutely-positioned div instead?
var title_rect = e.reserveSpaceTop(g.getOption('titleHeight'));
this.title_div_ = createDivInRect(title_rect);
this.title_div_.style.textAlign = 'center';
this.title_div_.style.fontSize = (g.getOption('titleHeight') - 8) + 'px';
this.title_div_.style.fontWeight = 'bold';
this.title_div_.style.zIndex = 10;
var class_div = document.createElement("div");
class_div.className = 'dygraph-label dygraph-title';
class_div.innerHTML = g.getOption('title');
this.title_div_.appendChild(class_div);
div.appendChild(this.title_div_);
}
if (g.getOption('xlabel')) {
var x_rect = e.reserveSpaceBottom(g.getOption('xLabelHeight'));
this.xlabel_div_ = createDivInRect(x_rect);
this.xlabel_div_.style.textAlign = 'center';
this.xlabel_div_.style.fontSize = (g.getOption('xLabelHeight') - 2) + 'px';
var class_div = document.createElement("div");
class_div.className = 'dygraph-label dygraph-xlabel';
class_div.innerHTML = g.getOption('xlabel');
this.xlabel_div_.appendChild(class_div);
div.appendChild(this.xlabel_div_);
}
if (g.getOption('ylabel')) {
// It would make sense to shift the chart here to make room for the y-axis
// label, but the default yAxisLabelWidth is large enough that this results
// in overly-padded charts. The y-axis label should fit fine. If it
// doesn't, the yAxisLabelWidth option can be increased.
var y_rect = e.reserveSpaceLeft(0);
this.ylabel_div_ = createRotatedDiv(
g, y_rect,
1, // primary (left) y-axis
'dygraph-label dygraph-ylabel',
g.getOption('ylabel'));
div.appendChild(this.ylabel_div_);
}
if (g.getOption('y2label') && g.numAxes() == 2) {
// same logic applies here as for ylabel.
var y2_rect = e.reserveSpaceRight(0);
this.y2label_div_ = createRotatedDiv(
g, y2_rect,
2, // secondary (right) y-axis
'dygraph-label dygraph-y2label',
g.getOption('y2label'));
div.appendChild(this.y2label_div_);
}
};
chart_labels.prototype.didDrawChart = function(e) {
var g = e.dygraph;
if (this.title_div_) {
this.title_div_.children[0].innerHTML = g.getOption('title');
}
if (this.xlabel_div_) {
this.xlabel_div_.children[0].innerHTML = g.getOption('xlabel');
}
if (this.ylabel_div_) {
this.ylabel_div_.children[0].children[0].innerHTML = g.getOption('ylabel');
}
if (this.y2label_div_) {
this.y2label_div_.children[0].children[0].innerHTML = g.getOption('y2label');
}
};
chart_labels.prototype.clearChart = function() {
};
chart_labels.prototype.destroy = function() {
this.detachLabels_();
};
return chart_labels;
})();
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