Twaver-HTML5基础学习(39)鹰眼可视化视图组件(OverView)

OverView

基本使用：

var overview = new twaver.network.Overview(network); 
overview.adjustBounds({
   x:0, y:0, width:200, height:200});

鹰眼可视化视图组件的作用

鹰眼对象
创建和Network绑定的鹰眼视图，鹰眼是Network的缩略图，能通过鹰眼导航Network。鹰眼支持各种操作：
单击：将Network的视图中心导航到指定坐标点
双击：将Network的缩放级别还原为1
按着CTRL键框选：将Network缩放并平移到指定区域

所谓鹰眼就是一个缩略图，内嵌矩形框，显示当前Network中的数据，拖动矩形框可以改变当前Network显示的位置，改变矩形框的大小，可以改变当前Network视图区域大小，从而起到导航的作用。

设置鹰眼视图的尺寸

    //如果是将overview放在布局容器中，大小会自动调整
    var overview = new twaver.network.Overview(this.network);
    var leftSplit = new SplitPane(this.tree, overview, 'vertical', 0.7);
    //否则调用adjustBounds();
    overview.adjustBounds({
   x:0, y:0, width:200, height:200});

使用

双击后：
单机后：

按住ctrl+鼠标选中

react代码：

/*
 * @Descripttion: 
 * @version: 
 * @Author: ZhangJunQing
 * @Date: 2022-04-18 14:44:05
 * @LastEditors: ZhangJunQing
 * @LastEditTime: 2022-05-06 14:30:46
 */
import React, {
    useEffect, useState } from 'react'

const twaver = require('twaver');
// const demo = require('demo');
const Demo = () => {
   
    const [network, setnetwork] = useState({
   })
    const init = () => {
   
        var box = new twaver.ElementBox();
        var network = new twaver.vector.Network(box);
        setnetwork(network)
        network.invalidateElementUIs();
        var autoLayouter = new twaver.layout.AutoLayouter(box);
        network.setScrollBarVisible(false)
        var tree = new twaver.controls.Tree(box);

        var overview = new twaver.vector.Overview(network);

        var BottomPane = new twaver.controls.SplitPane(tree, overview, 'horizontal', 0.3);
        var pane = new twaver.controls.SplitPane(network, BottomPane, 'vertical', 0.6);
        var view = pane.getView();
        view.style.left = '0px';
        view.style.top = '0px';
        view.style.right = '0px';
        view.style.bottom = '0px';
        document.getElementById("testID").appendChild(view);
        var from1 = new twaver.Node();
        from1.setName('from1');
        box.add(from1);
        var to = new twaver.Node();
        to.setName('To');
        box.add(to);
        var from2 = new twaver.Node();
        from2.setName('from2');
        box.add(from2);
        var from3 = new twaver.Node();
        from3.setName('from3');
        box.add(from3);
        var from4 = new twaver.Node();
        from4.setName('from4');
        box.add(from4);
        var link = new twaver.Link(from1, to);
        var link2 = new twaver.Link(from2, to);
        var link3 = new twaver.Link(from3, to);
        var link4 = new twaver.Link(from4, to);
        link.setName('Link');
        link2.setName('link2');
        link3.setName('link3');
        link4.setName('link4');
        box.add(link);
        box.add(link2);
        box.add(link3);
        box.add(link4);
        autoLayouter.doLayout('symmetry', function () {
   
            network.zoomOverview(false);
        });

    }
    useEffect(init, [])


    return (
        <>
            <p style={
   {
    fontSize: "20px", paddingLeft: "50px", poaddingTop: "50px" }}>tips: </p>
            <ul style={
   {
    fontSize: "20px", paddingLeft: "50px" }}>
                <li>Overview</li>
            </ul>
            {
   /* 画布元素需要开启定位 不然生成的图元坐标点会偏移 */}
            <div id="testID" style={
   {
    width: "800px", height: "800px", border: "1px solid #ccc", position: "relative", margin: "0 auto" }}></div>
        </>
    )
}
export default Demo

学习参考：TWaver Documents