SpringGraph是Adobe的Flex

2.0的开源组件，它可以显示一套有相互联系的节点关系。该组件允许用户拖动和/或交互的个别节点。数据可以是XML或ActionScript对象。

本文使用xml数据来做演示.

网上搜下可以搜到几个非常不错的实例..SpringGraph 的文档还是比较少的.

先来看下本文做出来的效果图.

图形是自定义的,这里你可以使用任意图形来连接节点.

首先引入组件这个不用说,将SpringGraph.swc 组件引入到工程.

motionThreshold="1.5" repulsionFactor="0.60"

dataProvider="{graph}" itemRenderer="AtomView">

几个属性的介绍:

motionThreshold--布局计算停止的时间，有意义的值的范围是从0.001到2.0左右。低的数字意味着布局需要更长的时间定下来。高数量意味着布局将更快停止,这个值适中即可.

repulsionFactor--原子之间的关系间距,默认是0.75

dataProvider--不用说,就是你的数据来源.

itemRenderer--定义一个项目渲染UIComponent类,这个类可以绘制每个节点的样式以及形状大小.

lineColor --线的颜色.

autoFit--自动调整,保证该图形不跑出界面

这几个属性是我所用到的.可能用自己的语言组织出来不是很明白.大家试试就可以了。

之后需要一个符合格式的xml

var strXML:String = "<molecule convention=\"MDLMol\" id=\"dataSmall\" title=\"NICOTINE\">" +

"<graph>" +

"<Node id=\"1\" prop=\"节点文章\" color=\"0xaf3a42\" />" +

"<Node id=\"1.1\" prop=\"文章第一篇\" color=\"0xfa7730\" />" +

"<Node id=\"1.2\" prop=\"文章第二篇\" color=\"0x33CC99\"/>" +

"<Node id=\"1.3\" prop=\"文章第三篇\" color=\"0x6b4c8f\" />" +

"<Node id=\"1.4\" prop=\"文章第四篇\" color=\"0x585fee\" />" +

"<Node id=\"1.1.1\" prop=\"关键字一\" color=\"0xaf3a42\" />" +

"<Node id=\"1.1.2\" prop=\"关键字二\" color=\"0x6b4c8f\" />" +

"<Node id=\"1.1.3\" prop=\"关键字三\" color=\"0xfa7730\" />" +

"<Node id=\"1.1.4\" prop=\"关键字四\" color=\"0x585fee\" />" +

"<Edge fromID=\"1\" toID=\"1.1\" order=\"1\" number=\"10\"/>" +

"<Edge fromID=\"1\" toID=\"1.2\" order=\"3\" number=\"15\"/>" +

"<Edge fromID=\"1\" toID=\"1.3\" order=\"4\" number=\"3\"/>" +

"<Edge fromID=\"1\" toID=\"1.4\" order=\"2\" number=\"8\"/>" +

"<Edge fromID=\"1.1\" toID=\"1.1.1\" order=\"5\" number=\"7\"/>" +

"<Edge fromID=\"1.1\" toID=\"1.1.2\" order=\"1\" number=\"4\"/>" +

"<Edge fromID=\"1.1\" toID=\"1.1.3\" order=\"3\" number=\"12\"/>" +

"<Edge fromID=\"1.1\" toID=\"1.1.4\" order=\"2\" number=\"9\"/>" +

"<Edge fromID=\"1.2\" toID=\"1.1.1\" order=\"5\" number=\"100\"/>" +

"

graph>

molecule>";

注意关键的属性 fromID 和toID

Node节点就是原子,Edge是他们之间的关系. prop 是名称

,color就是圆的颜色了,order是线的粗细,number 的线上显示的文字.

Mian.mxml代码

"springgraph" bottom="0" top="0" right="0" left="0" backgroundColor="#ffffff"

motionThreshold="1.5" repulsionFactor="0.60" dataProvider="{graph}" autoFit="true" itemRenderer="AtomView">

[Bindable]

public var graph: Graph = new Graph();

//strXML就是上文写的到那段xml

private function gotData(strXml:String): void {

//ShowLoding();

graph.empty();

// 获得xml数据

var x:XML = new XML(strXml);

loadCML(x, graph);

}

// This namespace is used in some, but not all, CML files

public static var cmlns:Namespace = new Namespace("x-schema:cml_schema_ie_02.xml");

private static function loadCML(cml: XML, g: Graph): void {

var gid: String = cml.@id;

var item: Item;

for each (var node: XML in cml..Node) {

item = new Item(gid + node.@id);

item.data = node;

g.add(item);

}

for each (node in cml..cmlns::Node) {

item = new Item(gid + node.@id);

item.data = node;

g.add(item);

}

for each (var bond: XML in cml..Edge) {

loadBond(bond, g, gid);

}

for each (bond in cml..cmlns::Edge) {

loadBond(bond, g, gid);

}

}

private static function loadBond(bond: XML, g: Graph, gid: String): void {

var fromID: String;

var toID: String;

var orderString: String;

var infoString:String;

var colorString:String;

try {

fromID = bond.@fromID;

toID = bond.@toID;

orderString = bond.@order;

infoString = bond.@number;

colorString = bond.@color;

} catch (e: Error) {

}

var fromItem: Item = g.find(gid + fromID);

var toItem: Item = g.find(gid + toID);

if((fromItem != null) && (toItem != null)) {

var order: int = int(orderString.toString());

var data: Object = {settings: {alpha: 0.2 , color: colorString, tooltip: "测试数据",info:infoString, thickness: order}};

g.link(fromItem, toItem, data);

}

}

注意这句话:

var data: Object =

{settings:{alpha:0.2,color:colorString,tooltip:”测试数据",info:infoString,thickness:

order}};

这句话是设置连接先的样式.

itemRenderer="AtomView"

AtomView 是一个mxml组件 用来呈现图形化UI

AtomView.mxml代码:

<Circle id="circle" doubleClick="createPopUp(data.data.@pid)"/>

<mx:Label id="lab" doubleClick="createPopUp(data.data.@pid)"/>

<mx:Style source="index.css"/>

scaleX="{Main.getInstance().scaleFactor}"

scaleY="{Main.getInstance().scaleFactor}" -->

<mx:Script>

<![CDATA[

import com.adobe.flex.extras.controls.springgraph.Item;

import mx.containers.ControlBar;

import mx.containers.Panel;

import mx.containers.VBox;

import mx.controls.Alert;

import mx.controls.Button;

import mx.controls.Label;

import mx.controls.List;

import mx.controls.Spacer;

import mx.controls.TextInput;

import mx.graphics.SolidColor;

import mx.graphics.SolidColorStroke;

import mx.graphics.Stroke;

import mx.managers.PopUpManager;

private var _data: Item;

private var created: Boolean = false;

override public function set data(d: Object): void {

super.data = d;

_data = d as Item;

if(created)

applyData();

}

private function creationComplete(): void {

created = true;

if(_data != null)

applyData();

}

private function applyData(): void {

var name: String = getAtomName(_data.data as XML);

var _color: int;

var dataXML:XML = _data.data as XML

var colorInt:int = int(dataXML.@color);

// this atom type is not in the 'atomColors' table. use a default.

_color = colorInt;

// determine the size. To a first approximation, all atoms are roughly the

// same size. See http://www.historyoftheuniverse.com/atomsize.html.

var labelX: int = 30;

var labelY: int = 50; // TODO: figure out how to do vertical centering automatically

var size: int = 60;

this.width = 62;

this.height = 62;

circle.color = _color;

circle.width = size;

circle.height = size;

circle.cx = 30;

circle.cy = 30;

circle.doubleClickEnabled = true;

var order:int = int(dataXML.@order);

lab.width = 120;

lab.x = 5;//labelX;

lab.y = 20;//labelY;

lab.text = name;

lab.doubleClickEnabled = true;

lab.toolTip = lab.text + "\n" + dataXML.@number;

size = 60+order*5;

circle.cx = 30+order*5;

circle.cy = 30+order*5;

this.width = 62+order*10;

this.height = 62+order*10;

circle.width = size+order*5;

circle.height = size+order*5;

lab.y = 20+order*5;

}

private function getAtomName(atomXML: XML): String {

var name: String = String(atomXML.@prop);

if((name == null) || (name.length == 0)) {

// We didn't' find a name. Try again using a namespace.

var ns: Namespace = Main.cmlns;

name = atomXML.ns::string; // .(@builtin == "elementType");

// TODO: the above XML expression works, but isn't the right expression. fix it.

}

return name;

}

</mx:Script>

Circle是一个自定义圆的UIComponent

Circle代码

package

{

import flash.display.GradientType;

import flash.display.InterpolationMethod;

import flash.display.SpreadMethod;

import flash.geom.Matrix;

import mx.core.UIComponent;

import mx.effects.Rotate;

public class Circle extends UIComponent

{

private var _cx:int;

private var _cy:int;

public function set cx(i: int): void {

_cx = i;

}

public function set cy(i: int): void {

_cy = i;

}

public function set color(i: int): void {

_color = i;

invalidateDisplayList();

}

private var _color: int;

override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void {

graphics.clear();

graphics.beginFill(_color,0.4);

graphics.lineStyle(1,0x000000,1,true,"nomal","none");

graphics.drawCircle(_cx, _cy, unscaledWidth/2);

graphics.endFill();

}

}

}

多形状展示图形:

SpringGraph里面有一个Roamer分支

Roamer可以分层次展示,并且可以展示历史节点.功能依然强大,有兴趣的朋友可以试试.

谁有好的制作拓扑的组件可以推荐下,最近正在制作一个流程图,灰常给力..