// version: 2017-11-25
/**
* o--------------------------------------------------------------------------------o
* | This file is part of the RGraph package - you can learn more at: |
* | |
* | http://www.rgraph.net |
* | |
* | RGraph is licensed under the Open Source MIT license. That means that it's |
* | totally free to use and there are no restrictions on what you can do with it! |
* o--------------------------------------------------------------------------------o
*/
/**
* 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.
*/
// Define the RGraph global variable
RGraph = window.RGraph || {isRGraph: true};
RGraph.Drawing = RGraph.Drawing || {};
/**
* The constructor. This function sets up the object. It takes the ID (the HTML attribute) of the canvas as the
* first argument, then th X position, the Y position and then the text to show
*
* @param string id The canvas tag ID
* @param number x The X position of the text
* @param number y The Y position of the text
* @param number text The text to show
*/
RGraph.Drawing.Text = function (conf)
{
/**
* Allow for object config style
*/
if ( typeof conf === 'object'
&& typeof conf.x === 'number'
&& typeof conf.y === 'number'
&& typeof conf.id === 'string') {
var id = conf.id
var x = conf.x;
var y = conf.y;
var text = String(conf.text);
var parseConfObjectForOptions = true; // Set this so the config is parsed (at the end of the constructor)
} else {
var id = conf;
var x = arguments[1];
var y = arguments[2];
var text = arguments[3];
}
this.id = id;
this.canvas = document.getElementById(id);
this.context = this.canvas.getContext('2d');
this.colorsParsed = false;
this.canvas.__object__ = this;
this.x = x;
this.y = y;
this.text = String(text);
this.coords = [];
this.coordsText = [];
this.original_colors = [];
this.firstDraw = true; // After the first draw this will be false
/**
* This defines the type of this shape
*/
this.type = 'drawing.text';
/**
* This facilitates easy object identification, and should always be true
*/
this.isRGraph = true;
/**
* This adds a uid to the object that you can use for identification purposes
*/
this.uid = RGraph.CreateUID();
/**
* This adds a UID to the canvas for identification purposes
*/
this.canvas.uid = this.canvas.uid ? this.canvas.uid : RGraph.CreateUID();
/**
* Some example background properties
*/
this.properties =
{
'chart.size': 10,
'chart.font': 'Segoe UI, Arial, Verdana, sans-serif',
'chart.bold': false,
'chart.angle': 0,
'chart.colors': ['black'],
'chart.events.click': null,
'chart.events.mousemove': null,
'chart.highlight.stroke': '#ccc',
'chart.highlight.fill': 'rgba(255,255,255,0.7)',
'chart.tooltips': null,
'chart.tooltips.effect': 'fade',
'chart.tooltips.css.class': 'RGraph_tooltip',
'chart.tooltips.event': 'onclick',
'chart.tooltips.highlight': true,
'chart.tooltips.coords.page': false,
'chart.bounding': false,
'chart.bounding.fill': 'rgba(255,255,255,0.7)',
'chart.bounding.stroke': '#777',
'chart.bounding.shadow': false,
'chart.bounding.shadow.color': '#ccc',
'chart.bounding.shadow.blur': 3,
'chart.bounding.shadow.offsetx': 3,
'chart.bounding.shadow.offsety': 3,
'chart.marker': false,
'chart.halign': 'left',
'chart.valign': 'bottom',
'chart.link': null,
'chart.link.target': '_self',
'chart.link.options': '',
'chart.text.accessible': true,
'chart.text.accessible.overflow': 'visible',
'chart.text.accessible.pointerevents': true,
'chart.clearto': 'rgba(0,0,0,0)',
'chart.shadow': false,
'chart.shadow.color': '#ccc',
'chart.shadow.offsetx': 2,
'chart.shadow.offsety': 2,
'chart.shadow.blur': 3
}
/**
* A simple check that the browser has canvas support
*/
if (!this.canvas) {
alert('[DRAWING.TEXT] No canvas support');
return;
}
/**
* Create the dollar object so that functions can be added to them
*/
this.$0 = {};
/**
* Translate half a pixel for antialiasing purposes - but only if it hasn't beeen
* done already
*/
if (!this.canvas.__rgraph_aa_translated__) {
this.context.translate(0.5,0.5);
this.canvas.__rgraph_aa_translated__ = true;
}
// Short variable names
var RG = RGraph,
ca = this.canvas,
co = ca.getContext('2d'),
prop = this.properties,
pa2 = RG.path2,
win = window,
doc = document,
ma = Math
/**
* "Decorate" the object with the generic effects if the effects library has been included
*/
if (RG.Effects && typeof RG.Effects.decorate === 'function') {
RG.Effects.decorate(this);
}
/**
* A setter method for setting properties.
*
* @param name string The name of the property to set OR it can be a map
* of name/value settings like what you set in the constructor
*/
this.set =
this.Set = function (name)
{
var value = typeof arguments[1] === 'undefined' ? null : arguments[1];
/**
* the number of arguments is only one and it's an
* object - parse it for configuration data and return.
*/
if (arguments.length === 1 && typeof name === 'object') {
RG.parseObjectStyleConfig(this, name);
return this;
}
/**
* This should be done first - prepend the property name with "chart." if necessary
*/
if (name.substr(0,6) != 'chart.') {
name = 'chart.' + name;
}
// Convert uppercase letters to dot+lower case letter
while(name.match(/([A-Z])/)) {
name = name.replace(/([A-Z])/, '.' + RegExp.$1.toLowerCase());
}
prop[name] = value;
return this;
};
/**
* A getter method for retrieving graph properties. It can be used like this: obj.Get('chart.strokestyle');
*
* @param name string The name of the property to get
*/
this.get =
this.Get = function (name)
{
/**
* This should be done first - prepend the property name with "chart." if necessary
*/
if (name.substr(0,6) != 'chart.') {
name = 'chart.' + name;
}
// Convert uppercase letters to dot+lower case letter
while(name.match(/([A-Z])/)) {
name = name.replace(/([A-Z])/, '.' + RegExp.$1.toLowerCase());
}
return prop[name.toLowerCase()];
};
/**
* Draws the rectangle
*/
this.draw =
this.Draw = function ()
{
/**
* Fire the onbeforedraw event
*/
RG.fireCustomEvent(this, 'onbeforedraw');
/**
* Parse the colors. This allows for simple gradient syntax
*/
if (!this.colorsParsed) {
this.parseColors();
// Don't want to do this again
this.colorsParsed = true;
}
/**
* Stop the coods array from growing
*/
this.coords = [];
/**
* Stop this growing uncntrollably
*/
this.coordsText = [];
/**
* The font, its size and whether its bold or not can be set by properties,
* so now they have been (potentiall) set - measure the text
*/
/**
* Measure the text and add the width/height
*
* text, bold, font, size
*
*/
var dimensions = RG.measureText(this.text, prop['chart.text.bold'],prop['chart.text.font'], prop['chart.text.size']);
// ------------- DRAW TEXT HERE -------------
co.fillStyle = prop['chart.colors'][0];
// Shadow
if (prop['chart.shadow']) {
RG.setShadow(
this,
prop['chart.shadow.color'],
prop['chart.shadow.offsetx'],
prop['chart.shadow.offsety'],
prop['chart.shadow.blur']
);
}
var ret = RG.text2(this, {
font: prop['chart.font'],
size: prop['chart.size'],
x: this.x,
y: this.y,
text: this.text,
bold: prop['chart.bold'],
angle: prop['chart.angle'],
bounding: prop['chart.bounding'],
'bounding.fill': prop['chart.bounding.fill'],
'bounding.stroke': prop['chart.bounding.stroke'],
'bounding.shadow': prop['chart.bounding.shadow'],
'bounding.shadow.color': prop['chart.bounding.shadow.color'],
'bounding.shadow.blur': prop['chart.bounding.shadow.blur'],
'bounding.shadow.offsetx': prop['chart.bounding.shadow.offsetx'],
'bounding.shadow.offsety': prop['chart.bounding.shadow.offsety'],
marker: prop['chart.marker'],
halign: prop['chart.halign'],
valign: prop['chart.valign']
});
// Shadow
if (prop['chart.shadow']) {
RG.noShadow(this);
}
// store the dimensions
this.coords.push({
0: ret.x, 'x': ret.x,
1: ret.y, 'y': ret.y,
2: ret.width, 'width': ret.width,
3: ret.height, 'height': ret.height
});
/**
* This installs the event listeners
*/
RG.InstallEventListeners(this);
/**
* Fire the onfirstdraw event
*/
if (this.firstDraw) {
this.firstDraw = false;
RG.fireCustomEvent(this, 'onfirstdraw');
this.firstDrawFunc();
}
/**
* Fire the ondraw event
*/
RG.FireCustomEvent(this, 'ondraw');
return this;
};
/**
* Used in chaining. Runs a function there and then - not waiting for
* the events to fire (eg the onbeforedraw event)
*
* @param function func The function to execute
*/
this.exec = function (func)
{
func(this);
return this;
};
/**
* The getObjectByXY() worker method
*/
this.getObjectByXY = function (e)
{
if (this.getShape(e)) {
return this;
}
};
/**
* Not used by the class during creating the graph, but is used by event handlers
* to get the coordinates (if any) of the selected bar
*
* @param object e The event object
*/
this.getShape = function (e)
{
var prop = this.properties;
var coords = this.coords;
var mouseXY = RGraph.getMouseXY(e);
var mouseX = mouseXY[0];
var mouseY = mouseXY[1];
for (var i=0,len=this.coords.length; i<len; i++) {
var left = coords[i].x;
var top = coords[i].y;
var width = coords[i].width;
var height = coords[i].height;
if (mouseX >= left && mouseX <= (left + width) && mouseY >= top && mouseY <= (top + height)) {
return {
0: this, 1: left, 2: top, 3: width, 4: height, 5: 0,
'object': this, 'x': left, 'y': top, 'width': width, 'height': height, 'index': 0, 'tooltip': prop['chart.tooltips'] ? prop['chart.tooltips'][0] : null
};
}
}
return null;
};
/**
* This function positions a tooltip when it is displayed
*
* @param obj object The chart object
* @param int x The X coordinate specified for the tooltip
* @param int y The Y coordinate specified for the tooltip
* @param objec tooltip The tooltips DIV element
*
this.positionTooltip = function (obj, x, y, tooltip, idx)
{
var coords = obj.coords[0];
var coordX = parseFloat(coords.x);
var coordY = parseFloat(coords.y);
var coordW = coords.width;
var coordH = coords.height;
var canvasXY = RG.getCanvasXY(obj.canvas);
var mouseXY = RG.getMouseXY(window.event);
var width = tooltip.offsetWidth;
var height = tooltip.offsetHeight;
// Set the top position
tooltip.style.left = 0;
tooltip.style.top = window.event.pageY - height - 5 + 'px';
// By default any overflow is hidden
tooltip.style.overflow = '';
// Reposition the tooltip if at the edges:
// LEFT edge
if (canvasXY[0] + mouseXY[0] - (width / 2) < 0) {
tooltip.style.left = canvasXY[0] + mouseXY[0] - (width * 0.1) + 'px';
// RIGHT edge
} else if (canvasXY[0] + mouseXY[0] + (width / 2) > doc.body.offsetWidth) {
tooltip.style.left = canvasXY[0] + mouseXY[0] - (width * 0.9) + 'px';
// Default positioning - CENTERED
} else {
tooltip.style.left = canvasXY[0] + mouseXY[0] - (width / 2) + 'px';
}
};*/
/**
* Each object type has its own Highlight() function which highlights the appropriate shape
*
* @param object shape The shape to highlight
*/
this.highlight =
this.Highlight = function (shape)
{
if (typeof prop['chart.highlight.style'] === 'function') {
(prop['chart.highlight.style'])(shape);
} else {
RG.Highlight.Rect(this, shape);
}
};
/**
* This allows for easy specification of gradients
*/
this.parseColors = function ()
{
// Save the original colors so that they can be restored when the canvas is reset
if (this.original_colors.length === 0) {
this.original_colors['chart.colors'] = RG.array_clone(prop['chart.colors'])[0];
this.original_colors['chart.fillstyle'] = RG.array_clone(prop['chart.fillstyle']);
this.original_colors['chart.strokestyle'] = RG.array_clone(prop['chart.strokestyle']);
this.original_colors['chart.highlight.stroke'] = RG.array_clone(prop['chart.highlight.stroke']);
this.original_colors['chart.highlight.fill'] = RG.array_clone(prop['chart.highlight.fill']);
}
/**
* Parse various properties for colors
*/
prop['chart.colors'][0] = this.parseSingleColorForGradient(prop['chart.colors'][0]);
prop['chart.fillstyle'] = this.parseSingleColorForGradient(prop['chart.fillstyle']);
prop['chart.strokestyle'] = this.parseSingleColorForGradient(prop['chart.strokestyle']);
prop['chart.highlight.stroke'] = this.parseSingleColorForGradient(prop['chart.highlight.stroke']);
prop['chart.highlight.fill'] = this.parseSingleColorForGradient(prop['chart.highlight.fill']);
};
/**
* Use this function to reset the object to the post-constructor state. Eg reset colors if
* need be etc
*/
this.reset = function ()
{
};
/**
* This parses a single color value
*/
this.parseSingleColorForGradient = function (color)
{
if (!color) {
return color;
}
if (typeof color === 'string' && color.match(/^gradient\((.*)\)$/i)) {
var parts = RegExp.$1.split(':');
// Create the gradient
var grad = co.createLinearGradient(0,0,ca.width,0);
var diff = 1 / (parts.length - 1);
grad.addColorStop(0, RGraph.trim(parts[0]));
for (var j=1,len=parts.length; j<len; ++j) {
grad.addColorStop(j * diff, RG.trim(parts[j]));
}
}
return grad ? grad : color;
};
/**
* Using a function to add events makes it easier to facilitate method chaining
*
* @param string type The type of even to add
* @param function func
*/
this.on = function (type, func)
{
if (type.substr(0,2) !== 'on') {
type = 'on' + type;
}
if (typeof this[type] !== 'function') {
this[type] = func;
} else {
RG.addCustomEventListener(this, type, func);
}
return this;
};
/**
* This function runs once only
* (put at the end of the file (before any effects))
*/
this.firstDrawFunc = function ()
{
};
RG.att(ca);
/**
* Objects are now always registered so that the chart is redrawn if need be.
*/
RG.Register(this);
/**
* This is the 'end' of the constructor so if the first argument
* contains configuration data - handle that.
*/
if (parseConfObjectForOptions) {
RG.parseObjectStyleConfig(this, conf.options);
}
};