SVGGraphic.js revision 4ef2f7e4cb7c7d255be077c47d542199f7bf8607
/**
* Graphic is a simple drawing api that allows for basic drawing operations.
*
* @class Graphic
* @constructor
*/
SVGGraphic = function(cfg) {
SVGGraphic.superclass.constructor.apply(this, arguments);
};
SVGGraphic.NAME = "svgGraphic";
SVGGraphic.ATTRS = {
render: {},
/**
* Unique id for class instance.
*
* @attribute id
* @type String
*/
id: {
valueFn: function()
{
return Y.guid();
},
setter: function(val)
{
var node = this._node;
if(node)
{
node.setAttribute("id", val);
}
return val;
}
},
/**
* Key value pairs in which a shape instance is associated with its id.
*
* @attribute shapes
* @type Object
* @readOnly
*/
shapes: {
readOnly: true,
getter: function()
{
return this._shapes;
}
},
/**
* Object containing size and coordinate data for the content of a Graphic in relation to the coordSpace node.
*
* @attribute contentBounds
* @type Object
* @readOnly
*/
contentBounds: {
readOnly: true,
getter: function()
{
return this._contentBounds;
}
},
/**
* The html element that represents to coordinate system of the Graphic instance.
*
* @attribute node
* @type HTMLElement
* @readOnly
*/
node: {
readOnly: true,
getter: function()
{
return this._node;
}
},
width: {
setter: function(val)
{
this._node.style.width = val + "px";
return val;
}
},
height: {
setter: function(val)
{
this._node.style.height = val + "px";
return val;
}
},
/**
* Determines how the size of instance is calculated. If true, the width and height are determined by the size of the contents.
* If false, the width and height values are either explicitly set or determined by the size of the parent node's dimensions.
*
* @attribute autoSize
* @type Boolean
* @default false
*/
autoSize: {
value: false
},
/**
* When overflow is set to true, by default, the viewBox will resize to greater values but not values. (for performance)
* When resizing the viewBox down is desirable, set the resizeDown value to true.
*
* @attribute resizeDown
* @type Boolean
*/
resizeDown: {
getter: function()
{
return this._resizeDown;
},
setter: function(val)
{
this._resizeDown = val;
this._redraw();
return val;
}
},
/**
* Indicates the x-coordinate for the instance.
*
* @attribute x
* @type Number
*/
x: {
getter: function()
{
return this._x;
},
setter: function(val)
{
this._x = val;
if(this._node)
{
this._node.style.left = val + "px";
}
return val;
}
},
/**
* Indicates the y-coordinate for the instance.
*
* @attribute y
* @type Number
*/
y: {
getter: function()
{
return this._y;
},
setter: function(val)
{
this._y = val;
if(this._node)
{
this._node.style.top = val + "px";
}
return val;
}
},
/**
* Indicates whether or not the instance will automatically redraw after a change is made to a shape.
* This property will get set to false when batching operations.
*
* @attribute autoDraw
* @type Boolean
* @default true
* @private
*/
autoDraw: {
value: true
},
visible: {
value: true,
setter: function(val)
{
this._toggleVisible(val);
return val;
}
},
/**
* Indicates the pointer-events setting for the svg:svg element.
*
* @attribute pointerEvents
* @type String
*/
pointerEvents: {
value: "none"
}
};
Y.extend(SVGGraphic, Y.BaseGraphic, {
/**
* @private
*/
_x: 0,
/**
* @private
*/
_y: 0,
/**
* Gets the current position of the graphic instance in page coordinates.
*
* @method getXY
* @return Array The XY position of the shape.
*/
getXY: function()
{
var node = Y.one(this._node),
xy;
if(node)
{
xy = node.getXY();
}
return xy;
},
/**
* @private
* @property _resizeDown
* @type Boolean
*/
_resizeDown: false,
/**
* Initializes the class.
*
* @method initializer
* @private
*/
initializer: function() {
var render = this.get("render");
this._shapes = {};
this._contentBounds = {
left: 0,
top: 0,
right: 0,
bottom: 0
};
this._gradients = {};
this._node = DOCUMENT.createElement('div');
this._node.style.position = "absolute";
this._node.style.left = this.get("x") + "px";
this._node.style.top = this.get("y") + "px";
this._contentNode = this._createGraphics();
this._contentNode.setAttribute("id", this.get("id"));
this._node.appendChild(this._contentNode);
if(render)
{
this.render(render);
}
},
/**
* Adds the graphics node to the dom.
*
* @method render
* @param {HTMLElement} parentNode node in which to render the graphics node into.
*/
render: function(render) {
var parentNode = Y.one(render),
w = this.get("width") || parseInt(parentNode.getComputedStyle("width"), 10),
h = this.get("height") || parseInt(parentNode.getComputedStyle("height"), 10);
parentNode = parentNode || DOCUMENT.body;
parentNode.appendChild(this._node);
this.parentNode = parentNode;
this.set("width", w);
this.set("height", h);
this.parentNode = parentNode;
return this;
},
/**
* Removes all nodes.
*
* @method destroy
*/
destroy: function()
{
this.removeAllShapes();
this._removeChildren(this._node);
if(this._node && this._node.parentNode)
{
this._node.parentNode.removeChild(this._node);
}
},
/**
* Generates a shape instance by type.
*
* @method getShape
* @param {String} type type of shape to generate.
* @param {Object} cfg attributes for the shape
* @return Shape
*/
getShape: function(cfg)
{
cfg.graphic = this;
var shape = new this._shapeClass[cfg.type](cfg);
this.addShape(shape);
return shape;
},
/**
* Adds a shape instance to the graphic instance.
*
* @method addShape
* @param {Shape} shape The shape instance to be added to the graphic.
*/
addShape: function(shape)
{
var node = shape.node,
parentNode = this._frag || this._contentNode;
if(this.get("autoDraw"))
{
parentNode.appendChild(node);
}
else
{
this._getDocFrag().appendChild(node);
}
},
/**
* Removes a shape instance from from the graphic instance.
*
* @method removeShape
* @param {Shape|String}
*/
removeShape: function(shape)
{
if(!(shape instanceof SVGShape))
{
if(Y_LANG.isString(shape))
{
shape = this._shapes[shape];
}
}
if(shape && shape instanceof SVGShape)
{
shape.destroy();
delete this._shapes[shape.get("id")];
}
if(this.get("autoDraw"))
{
this._redraw();
}
return shape;
},
/**
* Removes all shape instances from the dom.
*
* @method removeAllShapes
*/
removeAllShapes: function()
{
var shapes = this._shapes,
i;
for(i in shapes)
{
if(shapes.hasOwnProperty(i))
{
shapes[i].destroy();
}
}
this._shapes = {};
},
/**
* Removes all child nodes.
*
* @method _removeChildren
* @param {HTMLElement} node
* @private
*/
_removeChildren: function(node)
{
if(node.hasChildNodes())
{
var child;
while(node.firstChild)
{
child = node.firstChild;
this._removeChildren(child);
node.removeChild(child);
}
}
},
/**
* Clears the graphics object.
*
* @method clear
*/
clear: function() {
this.removeAllShapes();
},
/**
* Toggles visibility
*
* @method _toggleVisible
* @param {HTMLElement} node element to toggle
* @param {Boolean} val indicates visibilitye
* @private
*/
_toggleVisible: function(val)
{
var i,
shapes = this._shapes,
visibility = val ? "visible" : "hidden";
if(shapes)
{
for(i in shapes)
{
if(shapes.hasOwnProperty(i))
{
shapes[i].set("visible", val);
}
}
}
this._contentNode.style.visibility = visibility;
this._node.style.visibility = visibility;
},
/**
* @private
*/
_shapeClass: {
circle: Y.SVGCircle,
rect: Y.SVGRect,
path: Y.SVGPath,
ellipse: Y.SVGEllipse
},
/**
* Returns a shape based on the id of its dom node.
*
* @method getShapeById
* @param {String} id Dom id of the shape's node attribute.
* @return Shape
*/
getShapeById: function(id)
{
var shape = this._shapes[id];
return shape;
},
/**
* Allows for creating multiple shapes in order to batch appending and redraw operations.
*
* @method batch
* @param {Function} method Method to execute.
*/
batch: function(method)
{
var autoDraw = this.get("autoDraw");
this.set("autoDraw", false);
method();
this._redraw();
this.set("autoDraw", autoDraw);
},
_getDocFrag: function()
{
if(!this._frag)
{
this._frag = document.createDocumentFragment();
}
return this._frag;
},
_redraw: function()
{
var box = this.get("resizeDown") ? this._getUpdatedContentBounds() : this._contentBounds;
this._contentNode.style.left = box.left + "px";
this._contentNode.style.top = box.top + "px";
this._contentNode.setAttribute("width", box.width);
this._contentNode.setAttribute("height", box.height);
this._contentNode.style.width = box.width + "px";
this._contentNode.style.height = box.height + "px";
this._contentNode.setAttribute("viewBox", "" + box.left + " " + box.top + " " + box.width + " " + box.height + "");
if(this.get("autoSize"))
{
this.set("width", box.right);
this.set("height", box.bottom);
}
if(this._frag)
{
this._contentNode.appendChild(this._frag);
this._frag = null;
}
},
/**
* Adds a shape to the redraw queue and calculates the contentBounds.
*
* @method addToRedrawQueue
* @param shape {SVGShape}
*/
addToRedrawQueue: function(shape)
{
var shapeBox,
box;
this._shapes[shape.get("id")] = shape;
if(!this.get("resizeDown"))
{
shapeBox = shape.getBounds();
box = this._contentBounds;
box.left = box.left < shapeBox.left ? box.left : shapeBox.left;
box.top = box.top < shapeBox.top ? box.top : shapeBox.top;
box.right = box.right > shapeBox.right ? box.right : shapeBox.right;
box.bottom = box.bottom > shapeBox.bottom ? box.bottom : shapeBox.bottom;
box.width = box.right - box.left;
box.height = box.bottom - box.top;
this._contentBounds = box;
}
if(this.get("autoDraw"))
{
this._redraw();
}
},
_getUpdatedContentBounds: function()
{
var bounds,
i,
shape,
queue = this._shapes,
box = {
left: 0,
top: 0,
right: 0,
bottom: 0
};
for(i in queue)
{
if(queue.hasOwnProperty(i))
{
shape = queue[i];
bounds = shape.getBounds();
box.left = Math.min(box.left, bounds.left);
box.top = Math.min(box.top, bounds.top);
box.right = Math.max(box.right, bounds.right);
box.bottom = Math.max(box.bottom, bounds.bottom);
}
}
box.width = box.right - box.left;
box.height = box.bottom - box.top;
this._contentBounds = box;
return box;
},
/**
* Creates a contentNode element
*
* @method _createGraphics
* @private
*/
_createGraphics: function() {
var contentNode = this._createGraphicNode("svg"),
pointerEvents = this.get("pointerEvents");
contentNode.style.position = "absolute";
contentNode.style.top = "px";
contentNode.style.left = "0px";
contentNode.style.overflow = "auto";
contentNode.setAttribute("overflow", "auto");
contentNode.setAttribute("pointer-events", pointerEvents);
return contentNode;
},
/**
* Creates a graphic node
*
* @method _createGraphicNode
* @param {String} type node type to create
* @param {String} pe specified pointer-events value
* @return HTMLElement
* @private
*/
_createGraphicNode: function(type, pe)
{
var node = document.createElementNS("http://www.w3.org/2000/svg", "svg:" + type),
v = pe || "none";
if(type !== "defs" && type !== "stop" && type !== "linearGradient" && type != "radialGradient")
{
node.setAttribute("pointer-events", v);
}
return node;
},
/**
* Returns a reference to a gradient definition based on an id and type.
*
* @method getGradientNode
* @key {String} id that references the gradient definition
* @type {String} description of the gradient type
* @return HTMLElement
*/
getGradientNode: function(key, type)
{
var gradients = this._gradients,
gradient,
nodeType = type + "Gradient";
if(gradients.hasOwnProperty(key) && gradients[key].tagName.indexOf(type) > -1)
{
gradient = this._gradients[key];
}
else
{
gradient = this._createGraphicNode(nodeType);
if(!this._defs)
{
this._defs = this._createGraphicNode("defs");
this._contentNode.appendChild(this._defs);
}
this._defs.appendChild(gradient);
key = key || "gradient" + Math.round(100000 * Math.random());
gradient.setAttribute("id", key);
if(gradients.hasOwnProperty(key))
{
this._defs.removeChild(gradients[key]);
}
gradients[key] = gradient;
}
return gradient;
}
});
Y.SVGGraphic = SVGGraphic;