Twaver-HTML5基础学习(11)形状节点(ShapeNode)

形状节点(ShapeNode)

TWaver提供了一个特殊的节点:twaver.ShapeNode。这是一个节点扩展,与普通节点(Node)之间主要区别是:普通节点主要通过图片来表示一个物体,而形状节点通过一个任意形状来表示一个物体。形状节点由一系列点组成,这些点连接成一个形状。通过千变万化的形状,可以用来表示很多特殊的数据,比如一个国家或者地区、一个总线等等。

添加删除控制点相关方法：

get/setPoints:function(points)
addPoint:function(point)
addPointAt:function(point,index)
setPointAt:function(point,index)
removePoint:function(point)

此外还可以指定片段的绘制方式(segments),使ShapeNode表现更丰富的效果，如曲线(QuadTo)，间断(moveTo)等。绘制方式有三种，移动到(moveTo)、直线(lineTo)和曲线(quadto)。

上面的话是官网上的原话，但是一直没理解，官网上例子太少了，以后学习全面了，再回头看。目前先看怎么使用：

设置segments

get/setSegments:function(list)

需要配合上面的形状节点使用，首先创建一个list;

  var shapeNode2 = new twaver.ShapeNode();
  shapeNode2.setName('shapeNode2');
  shapeNode2.addPoint({ x: 300, y: 100 });
  shapeNode2.addPoint({ x: 200, y: 200 });
  shapeNode2.addPoint({ x: 100, y: 300 });
  shapeNode2.addPoint({ x: 400, y: 400 });
  shapeNode2.addPoint({ x: 500, y: 500 });
  shapeNode2.s('vector.fill.color', '#ec6c00');
  shapeNode2.s('vector.gradient', 'radial.east');
  // 创建List
  var segments = new twaver.List();
  segments.add("moveto");
  segments.add("quadto");
  segments.add("quadto");
  shapeNode2.setSegments(segments);
  box.add(shapeNode2);

例子：

工具类js:

const twaver = require('twaver');
// 设置每个图元name的颜色
twaver.Styles.setStyle('label.color', '#ec6c00');
// 设置每个图元name2的颜色
twaver.Styles.setStyle('label2.color', '#57ab9a');
twaver.Styles.setStyle('select.color', '#ef8200');
//TWaver内部预定义六中告警级别
twaver.AlarmSeverity.CRITICAL = twaver.AlarmSeverity.add(500, 'Critical', 'C', "#FF0000");
twaver.AlarmSeverity.MAJOR = twaver.AlarmSeverity.add(400, 'Major', 'M', "#FFA000");
twaver.AlarmSeverity.MINOR = twaver.AlarmSeverity.add(300, 'Minor', 'm', "#FFFF00");
twaver.AlarmSeverity.WARNING = twaver.AlarmSeverity.add(200, 'Warning', 'W', "#00FFFF");
twaver.AlarmSeverity.INDETERMINATE = twaver.AlarmSeverity.add(100, 'Indeterminate', 'N', "#C800FF");
twaver.AlarmSeverity.CLEARED = twaver.AlarmSeverity.add(0, 'Cleared', 'R', "#00FF00");

const { CRITICAL, MAJOR, WARNING, MINOR, INDETERMINATE, CLEARED } = twaver.AlarmSeverity
export const ALARM1 = CLEARED
export const ALARM2 = INDETERMINATE
export const ALARM3 = MINOR
export const ALARM4 = MAJOR
export const ALARM5 = CRITICAL

/**
 * 创建一个dataBox容器
 * 容器中可以add图元
 */
export const returnElementBoxFun = () => new twaver.ElementBox()


/**
 * 创建一个画布 network对象
 * @param {ElementBox} box  创建一个画布 network对象
 */
export const returnNetworkFun = (box) => new twaver.vector.Network(box)

/**
 * 创建一个Group
 * 用于包裹图元
 */
export const returnGroupFun = (box, obj = {}) => {
    let group = new twaver.Group(obj)
    box.add(group)
    return group
}



/**
 * 创建一个容器dataBox和一个画布
 * 并将容器实例化画布
 * @returns [box,network] box network
 */
export const returnElementBoxAndNetworkFun = () => {
    let box = returnElementBoxFun();
    let network = returnNetworkFun(box);
    return [box, network]
}

/**
 * 用于创建一个节点
 * @param {ElementBox} box dataBox 
 * @param {String} name 当前节点的name
 * @param {Number} x   当前节点的x坐标
 * @param {Number} y 当前节点的y坐标
 * @returns {Node} Node
 */
export const returnNodeFun = (box, Obj = {}) => {
    let node = new twaver.Node(Obj);
    // node.setName(name);
    // node.setLocation(x, y);
    box.add(node);
    return node
}

/**
 * 
 * @param {Node} node1 节点1
 * @param {Node} node2 节点2
 */
export const returnLineFun = (node1, node2) => new twaver.Link(node1, node2)

/**
 * 注册图片 用于设置图元的img setImage
 * @param {String} url 图片 url
 * @param {NetWork} svg  NetWork对象
 */
export function returnRegisterImage(url, svg) {
    var image = new Image();
    image.src = url;
    var views = arguments;
    image.onload = function () {
        // getImageName 获取到的图片name用做 node节点的显示img
        twaver.Util.registerImage(getImageName(url), image, image.width, image.height, svg === true);
        image.onload = null;
        for (var i = 1; i < views.length; i++) {
            var view = views[i];
            if (view.invalidateElementUIs) {
                view.invalidateElementUIs();
            }
            if (view.invalidateDisplay) {
                view.invalidateDisplay();
            }
        }
    };
    // getImageName 获取到的图片name用做 node节点的显示img
    const getImageName = (url) => {
        var index = url.lastIndexOf('/');
        var name = url;
        if (index >= 0) {
            name = url.substring(index + 1);
        }
        index = name.lastIndexOf('.');
        if (index >= 0) {
            name = name.substring(0, index);
        }
        return name;
    }
}


/*
 * @param {*} 告警的Id 
 * @param {*} 告警网元的Id 
  * @param {*} 告警级别 
 * @param {*} alarmBox 网元容器.getAlarmBox()
 */
export const returnAlarmFun = (alarmID, elementID, alarmSeverity, alarmBox) => {
    var alarm = new twaver.Alarm(alarmID, elementID, alarmSeverity);
    alarmBox.add(alarm);
}

/**
 * 
 * @param {*} box 容器dataBox
 * @param {*} layer layer对象
 * @param {*} shape 图层的形状
 * @param {*} x node点的坐标
 * @param {*} y node点的坐标
 * @param {*} width 图层的宽高
 * @param {*} height 图层的宽高
 * @param {*} fillColor  图层填充颜色
 */
/**
 * 
 * shape 
 * circle 圆形
 * diamond 菱形
 * rectangle 长方形
 */
export const createNode = (box, layer, shape, x, y, width, height, fillColor, ) => {
    var node = new twaver.Node();
    node.setLayerId(layer.getId());
    node.setName('layer-' + layer.getId());
    node.setStyle('body.type', 'vector');
    node.setStyle('vector.fill.alpha', 0.7);
    node.setStyle('vector.shape', shape);
    node.setSize(width, height);
    node.setLocation(x, y);
    node.setStyle('vector.fill.color', fillColor);
    box.add(node); return node;
}
/**
 * 
 * @param {*} table 
 * @param {*} name 
 * @param {*} propetyName 
 * @param {*} propertyType 
 * @param {*} valueType 
 */
export const returnCreateColumn = (table, name, propetyName, propertyType, valueType) => {
    var column = new twaver.Column(name);
    column.setName(name);
    column.setPropertyName(propetyName);
    column.setPropertyType(propertyType);
    if (valueType) {
        column.setValueType(valueType);
    }
    table.getColumnBox().add(column);
    return column;
}

export const returnRandomColor = () => {
    var r = randomInt(255);
    var g = randomInt(255);
    var b = randomInt(255);
    return '#' + formatNumber((r << 16) | (g << 8) | b);
}
function randomInt(n) {
    return Math.floor(Math.random() * n);
}

function formatNumber(value) {
    var result = value.toString(16);
    while (result.length < 6) { result = '0' + result; } return result;
}

react页面

/*
 * @Descripttion: 
 * @version: 
 * @Author: ZhangJunQing
 * @Date: 2022-04-18 14:44:05
 * @LastEditors: ZhangJunQing
 * @LastEditTime: 2022-04-19 18:03:17
 */
import React, { useEffect, useState } from 'react'
import {
    returnElementBoxAndNetworkFun,
} from './utils'
const twaver = require('twaver');
// const demo = require('demo');
const Demo = () => {
    const [network, setnetwork] = useState({})
    const init = () => {
        const [box, network] = returnElementBoxAndNetworkFun()
        setnetwork(_ => network)
        network.invalidateElementUIs();
        document.getElementById("testID").appendChild(network.getView());
        // 设置最初的大小
        network.adjustBounds({ x: 0, y: 0, width: 1000, height: 1000 });

        initDataBox()

        function initDataBox() {
            // ShapeNode 元素才有 addPoint 方法  NOde节点没有这个方法
            var shapeNode1 = new twaver.ShapeNode({ name: 'ShapeNode1' });
            // 填充颜色
            shapeNode1.s('vector.fill.color', 'RED');
            // 渐变颜色
            shapeNode1.s('vector.gradient', 'radial.center');
            // 添加的节点 从哪里开始到哪里结束
            shapeNode1.addPoint({ x: 30, y: 10 });
            shapeNode1.addPoint({ x: 80, y: 10 });
            shapeNode1.addPoint({ x: 100, y: 90 });
            shapeNode1.addPoint({ x: 10, y: 90 });
            shapeNode1.addPoint({ x: 30, y: 10 });
            box.add(shapeNode1);
            // 创建ShapeNode节点
            var shapeNode2 = new twaver.ShapeNode();
            shapeNode2.setName('shapeNode2');
            shapeNode2.addPoint({ x: 300, y: 100 });
            shapeNode2.addPoint({ x: 200, y: 200 });
            shapeNode2.addPoint({ x: 100, y: 300 });
            shapeNode2.addPoint({ x: 400, y: 400 });
            shapeNode2.addPoint({ x: 500, y: 500 });
            shapeNode2.s('vector.fill.color', '#ec6c00');
            shapeNode2.s('vector.gradient', 'radial.east');
            // 创建List
            var segments = new twaver.List();
            segments.add("moveto");
            segments.add("quadto");
            segments.add("quadto");
            shapeNode2.setSegments(segments);
            box.add(shapeNode2);
            var link = new twaver.ShapeLink(shapeNode1, shapeNode2);
            var list = new twaver.List();
            list.add({
                x: 250,
                y: 230
            });
            list.add({
                x: 350,
                y: 100
            });
            link.addPoint(list);
            box.add(link);
        }
    }
    useEffect(init, [])
    return (
        <>
            <p style={{ fontSize: "20px", paddingLeft: "50px", poaddingTop: "50px" }}>tips: </p>
            <ul style={{ fontSize: "20px", paddingLeft: "50px" }}>
                <li>形状节点(ShapeNode)</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" }}></div>
        </>
    )
}
export default Demo

学习参考：TWaver Documents