/**
* Layout Plugin
* TODO: provide an AbstractLayout Class
* @module layout-plugin
*/
/**
* Calculate the new position for the given layout and animate the layer to this position
*/
WireIt.Layer.prototype.layoutAnim = function( sLayout, duration) {
var layout = new WireIt.Layout[sLayout || "Spring"](this);
var newPositions = layout.run(),
n = this.containers.length;
for(var i = 0 ; i < n ; i++) {
var c = this.containers[i],
p = newPositions[i],
anim = new WireIt.util.Anim( c.terminals, c.el, { left: { to: p[0] }, top: {to: p[1]} }, duration || 1, YAHOO.util.Easing.easeOut);
anim.animate();
}
delete layout;
};
/**
* Start a dynamic layout
*/
WireIt.Layer.prototype.startDynamicLayout = function( sLayout, interval) {
if(this.dynamicLayout) {
this.stopDynamicLayout();
}
this.dynamicLayout = new WireIt.Layout[sLayout || "Spring"](this);
var that = this;
this.dynamicTimer = setInterval(function() {
that._runDynamicLayout();
}, interval || 50);
this._runDynamicLayout();
};
WireIt.Layer.prototype._runDynamicLayout = function( ) {
var newPositions = this.dynamicLayout.run(),
n = this.containers.length;
for(var i = 0 ; i < n ; i++) {
var c = this.containers[i],
p = newPositions[i];
// TODO: this test should be: isDragging && container focused
if(! YAHOO.util.Dom.hasClass(c.el, "WireIt-Container-focused") ) {
c.el.style.left = p[0]+"px";
c.el.style.top = p[1]+"px";
c.redrawAllWires();
}
}
};
/**
* Stop the dynamic layout
*/
WireIt.Layer.prototype.stopDynamicLayout = function() {
clearInterval(this.dynamicTimer);
this.dynamicTimer = null;
this.dynamicLayout = null;
};
/**
* @static
*/
WireIt.Layout = {};
/**
* Spring Layout (TODO: use different eges k)
* @class WireIt.Layout.Spring
* @constructor
*/
WireIt.Layout.Spring = function(layer) {
this.layer = layer;
this.init();
};
WireIt.Layout.Spring.prototype = {
/**
* Init the default structure
*/
init: function() {
this.nodes = [];
this.edges = [];
// Extract wires
for(var i = 0 ; i < this.layer.wires.length ; i++) {
var wire = this.layer.wires[i];
this.edges.push([this.layer.containers.indexOf(wire.terminal1.container), this.layer.containers.indexOf(wire.terminal2.container) ]);
}
},
/**
* TODO: split iterations into "step" method
*/
run: function() {
var i, j, l;
// Extract nodes positions
this.nodes = [];
for( i = 0 ; i < this.layer.containers.length ; i++) {
var pos = this.layer.containers[i].terminals[0].getXY();
this.nodes.push({
layoutPosX: (pos[0]-400)/200,
layoutPosY: (pos[1]-400)/200,
layoutForceX: 0,
layoutForceY: 0
});
}
// Spring layout parameters
var iterations = 100,
maxRepulsiveForceDistance = 6,
k = 0.3,
c = 0.01;
var d,dx,dy,d2,node,node1,node2;
// Iterations
for (l = 0; l < iterations; l++) {
// Forces on nodes due to node-node repulsions
for (i = 0; i < this.nodes.length; i++) {
node1 = this.nodes[i];
for (j = i + 1; j < this.nodes.length; j++) {
node2 = this.nodes[j];
dx = node2.layoutPosX - node1.layoutPosX;
dy = node2.layoutPosY - node1.layoutPosY;
d2 = dx * dx + dy * dy;
if(d2 < 0.01) {
dx = 0.1 * Math.random() + 0.1;
dy = 0.1 * Math.random() + 0.1;
d2 = dx * dx + dy * dy;
}
d = Math.sqrt(d2);
if(d < maxRepulsiveForceDistance) {
var repulsiveForce = k * k / d;
node2.layoutForceX += repulsiveForce * dx / d;
node2.layoutForceY += repulsiveForce * dy / d;
node1.layoutForceX -= repulsiveForce * dx / d;
node1.layoutForceY -= repulsiveForce * dy / d;
}
}
}
// Forces on this.nodes due to edge attractions
for (i = 0; i < this.edges.length; i++) {
var edge = this.edges[i];
node1 = this.nodes[ edge[0] ];
node2 = this.nodes[ edge[1] ];
dx = node2.layoutPosX - node1.layoutPosX;
dy = node2.layoutPosY - node1.layoutPosY;
d2 = dx * dx + dy * dy;
if(d2 < 0.01) {
dx = 0.1 * Math.random() + 0.1;
dy = 0.1 * Math.random() + 0.1;
d2 = dx * dx + dy * dy;
}
d = Math.sqrt(d2);
if(d > maxRepulsiveForceDistance) {
d = maxRepulsiveForceDistance;
d2 = d * d;
}
var attractiveForce = (d2 - k * k) / k;
node2.layoutForceX -= attractiveForce * dx / d;
node2.layoutForceY -= attractiveForce * dy / d;
node1.layoutForceX += attractiveForce * dx / d;
node1.layoutForceY += attractiveForce * dy / d;
}
// Move by the given force
for (i = 0; i < this.nodes.length; i++) {
node = this.nodes[i];
var xmove = c * node.layoutForceX;
var ymove = c * node.layoutForceY;
node.layoutPosX += xmove;
node.layoutPosY += ymove;
node.layoutForceX = 0;
node.layoutForceY = 0;
}
}
var newPositions = [];
for( i = 0 ; i < this.layer.containers.length ; i++) {
node = this.nodes[i];
newPositions.push([node.layoutPosX*200+400-40, node.layoutPosY*200+400-20]);
}
return newPositions;
}
};