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/**
* o------------------------------------------------------------------------------o
* | This file is part of the RGraph package - you can learn more at: |
* | |
* | http://www.rgraph.net |
* | |
* | This package is licensed under the RGraph license. For all kinds of business |
* | purposes there is a small one-time licensing fee to pay and for non |
* | commercial purposes it is free to use. You can read the full license here: |
* | |
* | http://www.rgraph.net/LICENSE.txt |
* o------------------------------------------------------------------------------o
*/
/**
* This is the RGraph.skeleton.js file which you can use as a base for creating new graph types.
*/
/**
* Having this here means that the RGraph libraries can be included in any order, instead of you having
* to include the common core library first.
*/
if (typeof(RGraph) == 'undefined') RGraph = {};
/**
* The chart constructor. This function sets up the object. It takes the ID (the HTML attribute) of the canvas as the
* first argument and the data as the second. If you need to change this, you can.
*
* @param string id The canvas tag ID
* @param array data The chart data
*/
RGraph.Skeleton = function (id, data)
{
/**
* Set these as object properties so they don't have to be constantly retrieved. Note that using a dollar
* function - $() - can cause conflicts with popular javascript libraries, eg jQuery. It's therefore best
* to stick to document.getElementById(). Setting the canvas and context as object properties means you
* can reference them like this: myObj.canvas
* myObj.context
*/
this.id = id;
this.canvas = document.getElementById(id);
this.context = this.canvas.getContext ? this.canvas.getContext("2d") : null;
/**
* This puts a reference to this object on to the canvas. Useful in event handling.
*/
this.canvas.__object__ = this;
/**
* This defines the type of this graph type and should be a one word description.
*/
this.type = 'skeleton';
/**
* This facilitates easy object identification, and should be true
*/
this.isRGraph = true;
/**
* This does a few things, for example adding the .fillText() method to the canvas 2D context when
* it doesn't exist. This facilitates the graphs to be still shown in older browser (though without
* text obviously). You'll find the function in RGraph.common.core.js
*/
RGraph.OldBrowserCompat(this.context);
/**
* Some example background properties, as used by the method RGraph.background.Draw()
*/
this.properties = {
'chart.gutter.left': 25,
'chart.gutter.right': 25,
'chart.gutter.top': 25,
'chart.gutter.bottom': 25,
'chart.colors': ['red','blue'],
'chart.background.barcolor1': 'rgba(0,0,0,0)',
'chart.background.barcolor2': 'rgba(0,0,0,0)',
'chart.background.grid': true,
'chart.background.grid.color': '#ddd',
'chart.background.grid.width': 1,
'chart.background.grid.hsize': 20,
'chart.background.grid.vsize': 20,
'chart.background.grid.vlines': true,
'chart.background.grid.hlines': true,
'chart.background.grid.border': true,
'chart.background.grid.autofit':false,
'chart.background.grid.autofit.align':false,
'chart.background.grid.autofit.numhlines': 7,
'chart.background.grid.autofit.numvlines': 20,
'chart.zoom.factor': 1.5,
'chart.zoom.fade.in': true,
'chart.zoom.fade.out': true,
'chart.zoom.hdir': 'right',
'chart.zoom.vdir': 'down',
'chart.zoom.frames': 25,
'chart.zoom.delay': 16.666,
'chart.zoom.shadow': true,
'chart.zoom.mode': 'canvas',
'chart.zoom.thumbnail.width': 75,
'chart.zoom.thumbnail.height': 75,
'chart.zoom.background': true,
'chart.contextmenu': null,
'chart.labels': null,
'chart.labels.ingraph': null,
'chart.labels.above': false,
'chart.labels.above.decimals': 0,
'chart.labels.above.size': null,
'chart.scale.decimals': 0,
'chart.scale.point': '.',
'chart.scale.thousand': ',',
'chart.crosshairs': false,
'chart.crosshairs.color': '#333',
'chart.crosshairs.hline': true,
'chart.crosshairs.vline': true,
'chart.annotatable': false,
'chart.annotate.color': 'black',
'chart.units.pre': '',
'chart.units.post': '',
'chart.key': null,
'chart.key.background': 'white',
'chart.key.position': 'graph',
'chart.key.shadow': false,
'chart.key.shadow.color': '#666',
'chart.key.shadow.blur': 3,
'chart.key.shadow.offsetx': 2,
'chart.key.shadow.offsety': 2,
'chart.key.position.gutter.boxed': true,
'chart.key.position.x': null,
'chart.key.position.y': null,
'chart.key.color.shape': 'square',
'chart.key.rounded': true,
'chart.key.linewidth': 1,
'chart.title': '',
'chart.title.background': null,
'chart.title.hpos': null,
'chart.title.vpos': null,
'chart.title.bold': true,
'chart.title.font': null,
'chart.title.xaxis': '',
'chart.title.xaxis.bold': true,
'chart.title.xaxis.size': null,
'chart.title.xaxis.font': null,
'chart.title.yaxis': '',
'chart.title.yaxis.bold': true,
'chart.title.yaxis.size': null,
'chart.title.yaxis.font': null,
'chart.title.xaxis.pos': null,
'chart.title.yaxis.pos': null,
'chart.title.yaxis.position': 'left',
'chart.text.color': 'black',
'chart.text.size': 10,
'chart.text.angle': 0,
'chart.text.font': 'Verdana',
'chart.resizable': false,
'chart.resize.handle.background': null,
'chart.adjustable': false,
'chart.hmargin': 5,
'chart.shadow': false,
'chart.shadow.color': '#666',
'chart.shadow.offsetx': 3,
'chart.shadow.offsety': 3,
'chart.shadow.blur': 3,
'chart.tooltips': null,
'chart.tooltips.effect': 'fade',
'chart.tooltips.css.class': 'RGraph_tooltip',
'chart.tooltips.event': 'onclick',
'chart.tooltips.highlight': true
}
/**
* A simple check that the browser has canvas support
*/
if (!this.canvas) {
alert('[SKELETON] No canvas support');
return;
}
/**
* Store the data that was passed to this constructor
*/
this.data = data;
/**
* This can be used to store the coordinates of shapes on the graph
*/
this.coords = [];
/**
* If you add a .get*(e) method to ease getting the shape that's currently being hovered over
* or has been clicked on (in the same vein as the Bar charts .getBar() method or the Line charts
* .getPoint() method) then you should set this so that common methods have a common function
* name to call - for example the context menu uses the common name .getShape(e) to add the
* details to the context menu.
*/
this.getShape = this.getXXX;
}
/**
* A setter method for setting graph properties. It can be used like this: obj.Set('chart.background.grid', false);
*
* @param name string The name of the property to set
* @param value mixed The value of the property
*/
RGraph.Skeleton.prototype.Set = function (name, value)
{
this.properties[name.toLowerCase()] = value;
}
/**
* A getter method for retrieving graph properties. It can be used like this: obj.Get('chart.background.grid');
* This can be used inside your methods that draw the graph.
*
* @param name string The name of the property to get
*/
RGraph.Skeleton.prototype.Get = function (name)
{
return this.properties[name.toLowerCase()];
}
/**
* The function you call to draw the chart after you have set all of the graph properties
*/
RGraph.Skeleton.prototype.Draw = function ()
{
/**
* This draws the background image, which when loaded draws the graph, hence the return
*/
if (typeof(this.Get('chart.background.image')) == 'string' && !this.__background_image__) {
RGraph.DrawBackgroundImage(this);
return;
}
/**
* Fire the custom RGraph onbeforedraw event (which should be fired before the chart is drawn)
*/
RGraph.FireCustomEvent(this, 'onbeforedraw');
/**
* Clear all of this canvases event handlers (the ones installed by RGraph)
*/
RGraph.ClearEventListeners(this.id);
/*************************
* Draw the chart here... *
*************************/
/**
* These call common functions, that facilitate some of RGraphs features
*/
/**
* Setup the context menu if required
*/
if (this.Get('chart.contextmenu')) {
RGraph.ShowContext(this);
}
/**
* Draw "in graph" labels
*/
if (this.Get('chart.labels.ingraph')) {
RGraph.DrawInGraphLabels(this);
}
/**
* Draw crosschairs
*/
if (this.Get('chart.crosshairs')) {
RGraph.DrawCrosshairs(this);
}
/**
* If the canvas is annotatable, do install the event handlers
*/
if (this.Get('chart.annotatable')) {
RGraph.Annotate(this);
}
/**
* This bit shows the mini zoom window if requested
*/
if (this.Get('chart.zoom.mode') == 'thumbnail' || this.Get('chart.zoom.mode') == 'area') {
RGraph.ShowZoomWindow(this);
}
/**
* This function enables resizing
*/
if (this.Get('chart.resizable')) {
RGraph.AllowResizing(this);
}
/**
* This function enables adjusting
*/
if (this.Get('chart.adjustable')) {
RGraph.AllowAdjusting(this);
}
/**
* Fire the custom RGraph ondraw event (which should be fired when you have drawn the chart)
*/
RGraph.FireCustomEvent(this, 'ondraw');
}
|