flowable 走过的流程图节点描红线

 在正常的flowable就是显示当前节点，路径需要我们自己获取，特别是来回的驳回会导致节点混乱，这里主要就是如何正确的显示流程图

效果：

已经结束的流程

  正在执行的流程

 代码：1、生成图片

// 源码 www.1b23.com

public byte[] createImage2(String processInstanceId) {

        //1.获取当前的流程实例

        ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();

        String processDefinitionId = null;

        List<String> activeActivityIds = null;

        //2.获取所有的历史轨迹对象

        List<HistoricActivityInstance> list = historyService.createHistoricActivityInstanceQuery()

                .processInstanceId(processInstanceId).list();

        Map<String, HistoricActivityInstance> hisActivityMap = new HashMap<>();

        list.forEach(historicActivityInstance -> {

            if (!hisActivityMap.containsKey(historicActivityInstance.getActivityId())) {

                hisActivityMap.put(historicActivityInstance.getActivityId(), historicActivityInstance);

            }

        });

        //3. 获取流程定义id和高亮的节点id

        if (processInstance != null) {

            //3.1. 正在运行的流程实例

            processDefinitionId = processInstance.getProcessDefinitionId();

            activeActivityIds = runtimeService.getActiveActivityIds(processInstanceId);

        } else {

            //3.2. 已经结束的流程实例

            HistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();

            processDefinitionId = historicProcessInstance.getProcessDefinitionId();

            activeActivityIds = new ArrayList<>();

            List<EndEvent> endEvents = bpmnModelService.findEndFlowElement(processDefinitionId);

            List<String> finalActiveActivityIds = activeActivityIds;

            endEvents.forEach(endEvent -> {

                if (hisActivityMap.containsKey(endEvent.getId())) {

                    finalActiveActivityIds.add(endEvent.getId());

                }

            });

        }

        //4. 获取流程定义的所有节点信息

        List<FlowNode> flowNodes = bpmnModelService.findFlowNodes(processDefinitionId);

        Map<String, FlowNode> activityMap = flowNodes.stream().collect(Collectors.toMap(FlowNode::getId, flowNode -> flowNode));

        List<String> highLightedFlows = new ArrayList<>();

        //5. 递归得到高亮线

        activeActivityIds.forEach(activeActivityId -> this.getHighLightedFlows(activityMap, hisActivityMap, activeActivityId, highLightedFlows, activeActivityId));

        //6. 获取bpmnModel对象

        BpmnModel bpmnModel = bpmnModelService.getBpmnModelByProcessDefId(processDefinitionId);

        //7. 生成图片流

        InputStream inputStream = flowProcessDiagramGenerator.generateDiagram(bpmnModel, activeActivityIds, highLightedFlows);

        //8. 转化成byte便于网络传输

        byte[] datas = IoUtil.readInputStream(inputStream, "image inputStream name");

        return datas;

    }

递归获取高

//from www.fhadmin.cn

private void getHighLightedFlows(Map<String, FlowNode> flowNodeMap,

            Map<String, HistoricActivityInstance> hisActivityMap,

            String activeActivityId,

            List<String> highLightedFlows,

            String oldActivityId) {

        FlowNode flowNode = flowNodeMap.get(activeActivityId);

        List<SequenceFlow> incomingFlows = flowNode.getIncomingFlows();

        for (SequenceFlow sequenceFlow : incomingFlows) {

            String sourceRefId = sequenceFlow.getSourceRef();

            if (hisActivityMap.containsKey(sourceRefId) && !oldActivityId.equals(sourceRefId)) {

                highLightedFlows.add(sequenceFlow.getId());

                this.getHighLightedFlows(flowNodeMap, hisActivityMap, sourceRefId, highLightedFlows, oldActivityId);

            } else {

　　　　　　　　　　if (hisActivityMap.containsKey(sourceRefId)){

　　　　　　　　　　　　　　highLightedFlows.add(sequenceFlow.getId());

　　　　　　　　　　}

　　　　　　　　　　break;

} } }