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SVG.Element = function Element(n) {
// keep reference to the element node
this.node = n;
// initialize attribute store
this.attrs = {};
// initialize transformations store
this.trans = {
x: 0,
y: 0,
scaleX: 1,
scaleY: 1,
rotation: 0,
skewX: 0,
skewY: 0
};
};
// Add element-specific functions
SVG.extend(SVG.Element, {
// move element to given x and y values
move: function(x, y) {
return this.attr({ x: x, y: y });
},
// set element size to given width and height
size: function(w, h) {
return this.attr({ width: w, height: h });
},
// position element by its center
center: function(x, y) {
var b = this.bbox();
return this.move(x - b.width / 2, y - b.height / 2);
},
// clone element
clone: function() {
var c,
n = this.node.nodeName;
// invoke shape method with shape-specific arguments
c = n == 'rect' ?
this.parent[n](this.attrs.width, this.attrs.height) :
n == 'ellipse' ?
this.parent[n](this.attrs.rx * 2, this.attrs.ry * 2) :
n == 'image' ?
this.parent[n](this.src) :
n == 'text' ?
this.parent[n](this.content) :
this.parent[n]();
// copy translations
c.trans = this.trans;
// apply attributes and translations
return c.attr(this.attrs).transform({});
},
// remove element
remove: function() {
return this.parent != null ? this.parent.remove(this) : void 0;
},
// get parent document
parentDoc: function() {
return this._parent(SVG.Doc);
},
// set svg element attribute
attr: function(a, v, n) {
if (arguments.length < 2) {
// apply every attribute individually if an object is passed
if (typeof a == 'object')
for (v in a) this.attr(v, a[v]);
// act as a getter for style attributes
else if (this._isStyle(a))
return a == 'text' ?
this.content :
a == 'leading' ?
this[a] :
this.style[a];
// act as a getter if the first and only argument is not an object
else
return this.attrs[a];
} else {
// store value
this.attrs[a] = v;
// treat x differently on text elements
if (a == 'x' && this._isText())
for (var i = this.lines.length - 1; i >= 0; i--)
this.lines[i].attr(a, v);
// set the actual attribute
else
n != null ?
this.node.setAttributeNS(n, a, v) :
this.node.setAttribute(a, v);
// if the passed argument belongs to the style as well, add it there
if (this._isStyle(a)) {
a == 'text' ?
this.text(v) :
a == 'leading' ?
this[a] = v :
this.style[a] = v;
this.text(this.content);
}
}
return this;
},
transform: function(o) {
// act as a getter if the first argument is a string
if (typeof o === 'string')
return this.trans[o];
// ... otherwise continue as a setter
var k,
t = [],
b = this.bbox(),
s = this.attr('transform') || '',
l = s.match(/[a-z]+\([^\)]+\)/g) || [];
// merge values
for (k in o)
if (o[k] != null)
this.trans[k] = o[k];
// alias current transformations
o = this.trans;
// add rotate
if (o.rotation != 0)
t.push('rotate(' + o.rotation + ',' + (o.cx != null ? o.cx : b.cx) + ',' + (o.cy != null ? o.cy : b.cy) + ')');
// add scale
t.push('scale(' + o.scaleX + ',' + o.scaleY + ')');
// add skew on x axis
if (o.skewX != 0)
t.push('skewX(' + o.skewX + ')');
// add skew on y axis
if (o.skewY != 0)
t.push('skewY(' + o.skewY + ')')
// add translate
t.push('translate(' + o.x + ',' + o.y + ')');
// add only te required transformations
return this.attr('transform', t.join(' '));
},
// get bounding box
bbox: function() {
// actual bounding box
var b = this.node.getBBox();
return {
// include translations on x an y
x: b.x + this.trans.x,
y: b.y + this.trans.y,
// add the center
cx: b.x + this.trans.x + b.width / 2,
cy: b.y + this.trans.y + b.height / 2,
// plain width and height
width: b.width,
height: b.height
};
},
// show element
show: function() {
this.node.style.display = '';
return this;
},
// hide element
hide: function() {
this.node.style.display = 'none';
return this;
},
// private: find svg parent
_parent: function(pt) {
var e = this;
// find ancestor with given type
while (e != null && !(e instanceof pt))
e = e.parent;
return e;
},
// private: tester method for style detection
_isStyle: function(a) {
return typeof a == 'string' && this._isText() ? (/^font|text|leading/).test(a) : false;
},
// private: element type tester
_isText: function() {
return this instanceof SVG.Text;
}
});
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