Mind，Diagram，Design

最近在设计新版的流程渲染引擎，考虑采用无损失放缩的矢量图SVG去搞，从技术调研到实现蛮有心得的，这里贴出自己的设计思路，欢迎拍砖～

首先说下诉求，简单说就是绘制流程地图。其次简单列举下需要注意的技术点：

（1）图形元素和坐标元素解析（合并or分拆）

（2） DOM树解析，原生JAXP，DOM4J or SVG DOM utils（混用会带来很多问题）

（3） REST Service Lib选型

（4） SVG 元素渲染技巧

（5）一些几何算法（旋转矢量，斜率，两点中距，碰撞检测）

（6）XML，XPath等一些奇淫技巧（Axis，namespace，doctype，qname，EntityResolver等）

好，Mind有了，我们上图评设计；

图1 ：原型 - 比较丑

图2 ：预期 - 比较美

图3 ： Core Class Diagram

图4 ： REST Request Response Sequence Diagram

图5： Process-Figure Render Sequence Diagram

SVG代码片断一：（伪table样式）

<?xml version='1.0' standalone='no'?>
<!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 1.1//EN'
  'https://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd'>
<svg width='100%' height='100%' xmlns='https://www.w3.org/2000/svg' xmlns:xlink='https://www.w3.org/1999/xlink'>

   <title>SVG Tables</title>

   <g id='columnGroup'>
      <rect x='25' y='30' width='35' height='70' fill="#c9dae5"/>

      <rect x='195' y='30' width='35' height='70' fill="#e0f0f9"/>

      <rect x='395' y='30' width='35' height='70' fill="#e0f0f9"/>
	  
      <text x='30' y='30' font-size='12' text-anchor='left'>
         <tspan x='30' dy='1em'>表头</tspan>
         <tspan x='30' dy='2em'>表头</tspan>
         <tspan x='30' dy='2em'>表头</tspan>
      </text>

      <text x='100' y='30' font-size='12' text-anchor='left'>
         <tspan x='100' dy='1em'>同意</tspan>
         <tspan x='100' dy='2em'>调查</tspan>
         <tspan x='100' dy='2em'>中国</tspan>
      </text>

      <text x='200' y='30' font-size='12' text-anchor='left'>
         <tspan x='200' dy='1em'>同意</tspan>
         <tspan x='200' dy='2em'>调查</tspan>
         <tspan x='200' dy='2em'>中国</tspan>
      </text>

      <text x='300' y='30' font-size='12' text-anchor='left'>
         <tspan x='300' dy='1em'>同意</tspan>
         <tspan x='300' dy='2em'>调查</tspan>
         <tspan x='300' dy='2em'>中国</tspan>
      </text>

      <text x='400' y='30' font-size='12' text-anchor='left'>
         <tspan x='400' dy='1em'>同意</tspan>
         <tspan x='400' dy='2em'>调查</tspan>
         <tspan x='400' dy='2em'>中国</tspan>
      </text>
   </g>
   
   <g id='rowGroup' transform='translate(0, 160)'>
      <rect  x='25' y='0' width='230' height='20' fill="#c9dae5"/>
	  <animateColor  attributeName="stroke" from="none" to="green" repeatCount="indefinite" dur="1.3s" calcMode="spline" />
	  
      <rect x='25' y='40' width='230' height='20' fill="#e0f0f9"/>

      <rect x='25' y='80' width='230' height='20' fill="#e0f0f9"/>
	  
      <text x='30' y='0' font-size='12' text-anchor='left'>
         <tspan x='30' dy='1em'>表头</tspan>
         <tspan x='100'>表头</tspan>
         <tspan x='200'>表头</tspan>
      </text>

      <text x='30' y='0' font-size='12' text-anchor='left'>
         <tspan x='30' dy='2.7em'>同意</tspan>
         <tspan x='100'>Expenses</tspan>
         <tspan x='200'>中国</tspan>
      </text>

      <text x='30' y='0' font-size='12' text-anchor='left'>
         <tspan x='30' dy='4.4em' >同意</tspan>
         <tspan x='100'>Expenses</tspan>
         <tspan x='200'>中国</tspan>
      </text>

      <text x='30' y='0' font-size='12' text-anchor='left'>
         <tspan x='30' dy='6.1em'>同意</tspan>
         <tspan x='100'>Expenses</tspan>
         <tspan x='200'>中国</tspan>
      </text>

      <text x='30' y='0' font-size='12' text-anchor='left'>
         <tspan x='30' dy='7.8em'>同意</tspan>
         <tspan x='100'>Expenses</tspan>
         <tspan x='200'>中国</tspan>
      </text>
   </g>
   
   
  <g>
     <rect x="370.0" y="144.0" width="600" height="15" fill="#c9dae5"/>
      <text x="377.0" y="144.0" font-size="11" text-anchor="left">
        <tspan  x="377.0" dy="1em">节点开始时间</tspan>
		<animateColor  attributeName="stroke" from="none" to="red" repeatCount="indefinite" dur="1.3s" calcMode="discrete" />
        <tspan x="507.0">节点结束时间</tspan>
        <tspan x="637.0">计划处理人</tspan>
        <tspan x="767.0">实际处理人</tspan>
        <tspan x="897.0">审批决策</tspan>
      </text>
      <text x="377.0" y="144.0" font-size="11" text-anchor="left">
        <tspan x="377.0" dy="2.5em">12-10-26 上午9:40</tspan>
        <tspan x="507.0" >12-10-26 下午2:53</tspan>
        <tspan x="637.0" >yun.ma</tspan>
		<tspan x="637.0" dy="1.5em">@alibaba-inc.com</tspan>
        <tspan x="767.0">admin@xbpms</tspan>
        <tspan x="897.0">重新进入</tspan>
      </text>
    </g>
</svg>

SVG代码片断二：（流程结点）

<?xml version="1.0" standalone="no"?>
<svg width="640" height="480" xmlns:xlink="https://www.w3.org/1999/xlink" xmlns="https://www.w3.org/2000/svg">
 <!-- Created with SVG-edit - https://svg-edit.googlecode.com/ -->
 <g>
  <title>公安机关财务报销申请</title>
  <g >
   <rect  x="206" y="232" width="123" height="38" fill="#cbeddb" stroke="#0000bf" stroke-width="2"/>
   <text  xml:space="preserve" text-anchor="middle" font-family="serif" font-size="12" stroke-dasharray="null" stroke-width="0" stroke="#000000" fill="#000000" y="263" x="274">结束</text>
   <text  xml:space="preserve" text-anchor="middle" font-family="serif" font-size="12" stroke-dasharray="null" stroke-width="0" stroke="#000000" fill="#008000" y="245" x="272"><<End State>></text>
   <rect x="216" y="247" width="12" height="12"  fill="#ff0000" stroke="#bf0000" stroke-width="2" stroke-dasharray="null"/>
  </g>
  <g >
   <path d="m253,140l11,5.199997l-11,7.800003l0,-13z"  fill="#000000" stroke="#000000" stroke-dasharray="null" transform="rotate(92.72631072998047 258.50000000000006,146.5) "/>
   <line x1="254" y1="95.000002" x2="259" y2="140"  stroke="#000000" stroke-dasharray="null" fill="none"/>
  </g>
  <g >
   <rect stroke-opacity="0.71" x="198" y="56" width="123" height="38"  fill="#cbeddb" stroke="#261b1b" stroke-width="2"/>
   <text xml:space="preserve" text-anchor="middle" font-family="serif" font-size="12" stroke-dasharray="null" stroke-width="0" stroke="#000000" fill="#000000"  y="88" x="266">财务报销申请</text>
   <text xml:space="preserve" text-anchor="middle" font-family="serif" font-size="12" stroke-dasharray="null" stroke-width="0" stroke="#000000" fill="#008000"  y="69" x="264"><<Start State>></text>
   <g >
    <circle cx="211.500001" cy="78" r="8.425827"  fill="#007f00" stroke="#007f00" stroke-width="null" stroke-dasharray="null"/>
    <path d="m208.96106,71.672707l0.005127,12.181953l10.376938,-6.133987l-10.382065,-6.047951z"  fill="#d0e0d0" stroke="#007f00" stroke-width="null" stroke-dasharray="null"/>
   </g>
  </g>
  <g >
   <rect  x="203" y="153" width="123" height="38" fill="#cbeddb" stroke="#ff0000" stroke-width="2"/>
   <text  xml:space="preserve" text-anchor="middle" font-family="serif" font-size="12" stroke-dasharray="null" stroke-width="0" stroke="#000000" fill="#000000" y="185" x="271">主管申请</text>
   <text  xml:space="preserve" text-anchor="middle" font-family="serif" font-size="12" stroke-dasharray="null" stroke-width="0" stroke="#000000" fill="#008000" y="166" x="269"><<Task State>></text>
   <g >
    <rect x="211" y="169" width="13.5" height="13.935483"  fill="#e5e5e5" stroke="#a59898" stroke-width="2" stroke-dasharray="null"/>
    <g >
     <rect x="213.5" y="171.064516" width="13.5" height="13.935483" fill="#e5e5e5" stroke="#a59898" stroke-width="2" stroke-dasharray="null" />
     <line x1="214.5" y1="174.677419" x2="225.5" y2="174.677419"  stroke="#a59898" stroke-width="2" stroke-dasharray="null" fill="none"/>
     <line x1="215" y1="177.774193" x2="226" y2="177.774193" stroke="#a59898" stroke-width="2" stroke-dasharray="null" fill="none" />
     <line x1="214.5" y1="180.870967" x2="225.5" y2="180.870967" stroke="#a59898" stroke-width="2" stroke-dasharray="null" fill="none" />
    </g>
   </g>
  </g>
  <g >
   <rect x="189" y="311" width="123" height="38" fill="#cbeddb" stroke="#0000bf" stroke-width="2" />
   <text xml:space="preserve" text-anchor="middle" font-family="serif" font-size="12" stroke-dasharray="null" stroke-width="0" stroke="#000000" fill="#000000" y="342" x="259" >Dubbo远程服务</text>
   <text xml:space="preserve" text-anchor="middle" font-family="serif" font-size="12" stroke-dasharray="null" stroke-width="0" stroke="#000000" fill="#008000" y="327" x="256" ><<Dubbo Node>></text>
   <g >
    <circle cx="200.090371" cy="326.131744" r="4.032028" fill="#f7f77e" stroke="#e5e557" stroke-width="2" stroke-dasharray="null" />
    <circle cx="204.73279" cy="334.544693" r="4.032028" fill="#f98a6b" stroke="#ff5656" stroke-width="2" stroke-dasharray="null" />
    <circle cx="196.267203" cy="334.868268" r="4.032028" fill="#5692ce" stroke="#5858d3" stroke-width="2" stroke-dasharray="null" />
   </g>
  </g>
 </g>
</svg>

核心代码片段

/**
 * REST API for SVG Process-Runtime-Figure
 * 
 * @author Von Gosling
 * @version 1.0.0
 */
@Singleton
@Path("svg")
public class SVGProcessFigureResource {
    private final Logger log = LoggerFactory.getLogger(getClass());

    @SuppressWarnings("unchecked")
    @GET
    @Produces(MediaType.APPLICATION_SVG_XML)
    public Response get(@Context HttpServletRequest request,
                        @DefaultValue("") @QueryParam("procId") String procId,
                        @DefaultValue("") @QueryParam("procName") String procName,
                        @DefaultValue("") @QueryParam("version") String version) {
        String content = "";
        try {
            Document doc = processDefinitionReader.getXmlProcessDefinition(procName,
                    NumberUtils.toInt(version, -1));

            if (StringUtils.isNotBlank(procId)) {
                // 获取静态流程上下文
                long procInstId = Long.parseLong(procId);
                HashMap<String, Object> staticProcessContext = (HashMap<String, Object>) processEngine
                        .getProcInstVarData(procInstId).get(0);
                // 获取流程运行期上下文
                Map<String, String> dynamicProcessContext = getProcRuntimeContext(procInstId);

                content = SVGProcessFigureGenerator.getSVG(doc, staticProcessContext,
                        dynamicProcessContext);
            } else {
                content = SVGProcessFigureGenerator.getSVG(doc);
            }
        } catch (Exception e) {
            log.error("Error occurs when getting SVG.", e);

            return Response.status(Status.INTERNAL_SERVER_ERROR)
                    .entity("Error occurs,please visit later !").build();
        }
        return Response.ok().entity(content).build();
    }

/**
 * @author Von Gosling
 * @version 1.0.0
 */
public class DomMappingPostProcessor {


    public static Document process(HashMap<String, Object> spContextMap,
                                   Map<String, String> dpContextMap, org.w3c.dom.Document svgDoc)
            throws DocumentException {
        //1. Xpath with namespace enabled 
        Map<String, String> npURIs = Maps.newHashMap();
        npURIs.put("svg", SVGConstants.SVG_NAMESPACE_URI);
        npURIs.put("xlink", SVGConstants.XLINK_NAMESPACE_URI);


        DOMReader reader = new DOMReader();
        reader.getDocumentFactory().setXPathNamespaceURIs(npURIs);


        Document doc = reader.read(svgDoc);
        //doc.accept(new NameSpaceCleaner());
        //doc.setEntityResolver(new IngoreDtdEntityResolver());


        //2.Append inline and external script
        JSBuilder.buildInlineScript(spContextMap, doc);
        JSBuilder.buildExternalScript(doc);


        //3.Append process context
        ContextBuilder.buildStaticProcessContext(doc);
        ContextBuilder.buildDynamicProcessContext(dpContextMap, doc);


        return doc;
    }


}

好了，差不多了，整个技术设计，编码实现都圆满KO～

欢迎大家对设计，实现部分提出异议，

最后更新：2017-04-02 00:06:48

Mind，Diagram，Design

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