实现效果：
TIM截图20180705145356.png
版本声明：Activiti 5.22.0
需求：Activiti原生代码在展示动态流程图时，仅支持高亮当前节点，且高亮颜色为红色，如何才能实现这样一个需求：要求在展示动态流程图时，走过的历史节点显示为绿色（颜色可配置），当前节点高亮为红色（颜色可配置）？下面讲述下思路。
1、重写ProcessDiagramGenerator接口中的generateDiagram方法，增加color参数：
package com.fengunion.scf.data.workflow.manager;
import java.awt.Color;
import java.io.InputStream;
import java.util.List;
import java.util.Set;
import org.activiti.bpmn.model.BpmnModel;
import org.activiti.image.ProcessDiagramGenerator;
public interface CustomProcessDiagramGeneratorI extends ProcessDiagramGenerator {
InputStream generateDiagram(BpmnModel bpmnModel, String imageType, List<String> highLightedActivities,
List<String> highLightedFlows, String activityFontName, String labelFontName, String annotationFontName,
ClassLoader customClassLoader, double scaleFactor, Color[] colors, Set<String> currIds);
}
2、在Activiti配置中注入自定义的CustomProcessDiagramGeneratorI（此处为SpringBoot方式）：
import java.util.ArrayList;
import java.util.List;
import org.activiti.engine.impl.interceptor.SessionFactory;
import org.activiti.spring.SpringProcessEngineConfiguration;
import org.activiti.spring.boot.ProcessEngineConfigurationConfigurer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import com.fengunion.scf.data.workflow.manager.CustomGroupEntityManagerFactory;
import com.fengunion.scf.data.workflow.manager.CustomProcessDiagramGeneratorI;
import com.fengunion.scf.data.workflow.manager.CustomUserEntityManagerFactory;
import com.fengunion.scf.data.workflow.manager.ProcessHistoryManagerSessionFactory;
@Configuration
public class ActivitiConfiguration implements ProcessEngineConfigurationConfigurer{
@Autowired
private CustomUserEntityManagerFactory customUserEntityManagerFactory;
@Autowired
private CustomGroupEntityManagerFactory customGroupEntityManagerFactory;
@Autowired
private ProcessHistoryManagerSessionFactory processHistoryManagerSessionFactory;
@Autowired
private CustomProcessDiagramGeneratorI customProcessDiagramGeneratorI;
@Override
public void configure(SpringProcessEngineConfiguration processEngineConfiguration) {
// TODO Auto-generated method stub
//processEngineConfiguration.setDataSource(dataSource);
processEngineConfiguration.setDatabaseSchemaUpdate("none");// none true
processEngineConfiguration.setDatabaseType("mysql");
//processEngineConfiguration.setTransactionManager(transactionManager);
// 流程图字体
processEngineConfiguration.setActivityFontName("宋体");
processEngineConfiguration.setAnnotationFontName("宋体");
processEngineConfiguration.setLabelFontName("宋体");
processEngineConfiguration.setJpaHandleTransaction(false);
processEngineConfiguration.setJpaCloseEntityManager(false);
//
// processEngineConfiguration.setMailServerHost(mailProperty.getMailServerHost());
// processEngineConfiguration.setMailServerUsername(mailProperty.getMailServerUsername());
// processEngineConfiguration.setMailServerPassword(mailProperty.getMailServerPassword());
// processEngineConfiguration.setMailServerPort(mailProperty.getMailServerPort());
//
processEngineConfiguration.setJobExecutorActivate(false);
processEngineConfiguration.setAsyncExecutorEnabled(false);
//processEngineConfiguration.setAsyncExecutorActivate(false);
//自定义用户和组
List<SessionFactory> customSessionFactories = new ArrayList<>();
customSessionFactories.add(customUserEntityManagerFactory);
customSessionFactories.add(customGroupEntityManagerFactory);
customSessionFactories.add(processHistoryManagerSessionFactory);
processEngineConfiguration.setCustomSessionFactories(customSessionFactories);
//自定义流程图样式
processEngineConfiguration.setProcessDiagramGenerator(customProcessDiagramGeneratorI);
}
}
3、实现自定义的CustomProcessDiagramGenerator类：
package com.fengunion.scf.data.workflow.manager;
import org.activiti.bpmn.model.*;
import org.activiti.bpmn.model.Process;
import org.activiti.image.impl.DefaultProcessDiagramGenerator;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.List;
import java.util.Set;
@Component
public class CustomProcessDiagramGenerator extends DefaultProcessDiagramGenerator implements CustomProcessDiagramGeneratorI{
//预初始化流程图绘制，大大提升了系统启动后首次查看流程图的速度
static {
new CustomProcessDiagramCanvas(10,10,0,0,"png", "宋体","宋体","宋体",null);
}
public CustomProcessDiagramCanvas generateProcessDiagram(BpmnModel bpmnModel, String imageType,
List<String> highLightedActivities, List<String> highLightedFlows, String activityFontName,
String labelFontName, String annotationFontName, ClassLoader customClassLoader, double scaleFactor,
Color [] colors, Set<String> currIds) {
if(null == highLightedActivities) {
highLightedActivities = Collections.<String>emptyList();
}
if(null == highLightedFlows) {
highLightedFlows = Collections.<String>emptyList();
}
prepareBpmnModel(bpmnModel);
CustomProcessDiagramCanvas processDiagramCanvas = initProcessDiagramCanvas(bpmnModel, imageType, activityFontName, labelFontName, annotationFontName, customClassLoader);
// Draw pool shape, if process is participant in collaboration
for (Pool pool : bpmnModel.getPools()) {
GraphicInfo graphicInfo = bpmnModel.getGraphicInfo(pool.getId());
processDiagramCanvas.drawPoolOrLane(pool.getName(), graphicInfo);
}
// Draw lanes
for (Process process : bpmnModel.getProcesses()) {
for (Lane lane : process.getLanes()) {
GraphicInfo graphicInfo = bpmnModel.getGraphicInfo(lane.getId());
processDiagramCanvas.drawPoolOrLane(lane.getName(), graphicInfo);
}
}
// Draw activities and their sequence-flows
for (Process process: bpmnModel.getProcesses()) {
List<FlowNode> flowNodeList= process.findFlowElementsOfType(FlowNode.class);
for (FlowNode flowNode : flowNodeList) {
drawActivity(processDiagramCanvas, bpmnModel, flowNode, highLightedActivities, highLightedFlows, scaleFactor, colors, currIds);
}
}
// Draw artifacts
for (Process process : bpmnModel.getProcesses()) {
for (Artifact artifact : process.getArtifacts()) {
drawArtifact(processDiagramCanvas, bpmnModel, artifact);
}
List<SubProcess> subProcesses = process.findFlowElementsOfType(SubProcess.class, true);
if (subProcesses != null) {
for (SubProcess subProcess : subProcesses) {
for (Artifact subProcessArtifact : subProcess.getArtifacts()) {
drawArtifact(processDiagramCanvas, bpmnModel, subProcessArtifact);
}
}
}
}
return processDiagramCanvas;
}
protected void drawActivity(CustomProcessDiagramCanvas processDiagramCanvas, BpmnModel bpmnModel, FlowNode flowNode,
List<String> highLightedActivities, List<String> highLightedFlows, double scaleFactor, Color[] colors, Set<String> currIds) {
ActivityDrawInstruction drawInstruction = activityDrawInstructions.get(flowNode.getClass());
if (drawInstruction != null) {
drawInstruction.draw(processDiagramCanvas, bpmnModel, flowNode);
// Gather info on the multi instance marker
boolean multiInstanceSequential = false, multiInstanceParallel = false, collapsed = false;
if (flowNode instanceof Activity) {
Activity activity = (Activity) flowNode;
MultiInstanceLoopCharacteristics multiInstanceLoopCharacteristics = activity.getLoopCharacteristics();
if (multiInstanceLoopCharacteristics != null) {
multiInstanceSequential = multiInstanceLoopCharacteristics.isSequential();
multiInstanceParallel = !multiInstanceSequential;
}
}
// Gather info on the collapsed marker
GraphicInfo graphicInfo = bpmnModel.getGraphicInfo(flowNode.getId());
if (flowNode instanceof SubProcess) {
collapsed = graphicInfo.getExpanded() != null && !graphicInfo.getExpanded();
} else if (flowNode instanceof CallActivity) {
collapsed = true;
}
if (scaleFactor == 1.0) {
// Actually draw the markers
processDiagramCanvas.drawActivityMarkers((int) graphicInfo.getX(), (int) graphicInfo.getY(),(int) graphicInfo.getWidth(), (int) graphicInfo.getHeight(),
multiInstanceSequential, multiInstanceParallel, collapsed);
}
// Draw highlighted activities
if (highLightedActivities.contains(flowNode.getId())) {
if(!CollectionUtils.isEmpty(currIds)
&&currIds.contains(flowNode.getId())
&& !(flowNode instanceof Gateway)) {//非结束节点，并且是当前节点
drawHighLight((flowNode instanceof StartEvent), processDiagramCanvas, bpmnModel.getGraphicInfo(flowNode.getId()), colors[1]);
}else {//普通节点
drawHighLight((flowNode instanceof StartEvent)||(flowNode instanceof EndEvent),processDiagramCanvas, bpmnModel.getGraphicInfo(flowNode.getId()), colors[0]);
}
}
}
// Outgoing transitions of activity
for (SequenceFlow sequenceFlow : flowNode.getOutgoingFlows()) {
String flowId = sequenceFlow.getId();
boolean highLighted = (highLightedFlows.contains(flowId));
String defaultFlow = null;
if (flowNode instanceof Activity) {
defaultFlow = ((Activity) flowNode).getDefaultFlow();
} else if (flowNode instanceof Gateway) {
defaultFlow = ((Gateway) flowNode).getDefaultFlow();
}
boolean isDefault = false;
if (defaultFlow != null && defaultFlow.equalsIgnoreCase(flowId)) {
isDefault = true;
}
// boolean drawConditionalIndicator = sequenceFlow.getConditionExpression() != null && !(flowNode instanceof Gateway);
String sourceRef = sequenceFlow.getSourceRef();
String targetRef = sequenceFlow.getTargetRef();
FlowElement sourceElement = bpmnModel.getFlowElement(sourceRef);
FlowElement targetElement = bpmnModel.getFlowElement(targetRef);
List<GraphicInfo> graphicInfoList = bpmnModel.getFlowLocationGraphicInfo(flowId);
if (graphicInfoList != null && graphicInfoList.size() > 0) {
graphicInfoList = connectionPerfectionizer(processDiagramCanvas, bpmnModel, sourceElement, targetElement, graphicInfoList);
int xPoints[]= new int[graphicInfoList.size()];
int yPoints[]= new int[graphicInfoList.size()];
for (int i=1; i<graphicInfoList.size(); i++) {
GraphicInfo graphicInfo = graphicInfoList.get(i);
GraphicInfo previousGraphicInfo = graphicInfoList.get(i-1);
if (i == 1) {
xPoints[0] = (int) previousGraphicInfo.getX();
yPoints[0] = (int) previousGraphicInfo.getY();
}
xPoints[i] = (int) graphicInfo.getX();
yPoints[i] = (int) graphicInfo.getY();
}
//画高亮线
processDiagramCanvas.drawSequenceflow(xPoints, yPoints, false, isDefault, highLighted, scaleFactor, colors[0]);
// Draw sequenceflow label
// GraphicInfo labelGraphicInfo = bpmnModel.getLabelGraphicInfo(flowId);
// if (labelGraphicInfo != null) {
// processDiagramCanvas.drawLabel(sequenceFlow.getName(), labelGraphicInfo, false);
// }else {//解决流程图连线名称不显示的BUG
GraphicInfo lineCenter = getLineCenter(graphicInfoList);
processDiagramCanvas.drawLabel(highLighted, sequenceFlow.getName(), lineCenter, Math.abs(xPoints[1]-xPoints[0]) >= 5);
// }
}
}
// Nested elements
if (flowNode instanceof FlowElementsContainer) {
for (FlowElement nestedFlowElement : ((FlowElementsContainer) flowNode).getFlowElements()) {
if (nestedFlowElement instanceof FlowNode) {
drawActivity(processDiagramCanvas, bpmnModel, (FlowNode) nestedFlowElement,
highLightedActivities, highLightedFlows, scaleFactor);
}
}
}
}
protected void drawHighLight(boolean isStartOrEnd, CustomProcessDiagramCanvas processDiagramCanvas, GraphicInfo graphicInfo, Color color) {
processDiagramCanvas.drawHighLight(isStartOrEnd, (int) graphicInfo.getX(), (int) graphicInfo.getY(), (int) graphicInfo.getWidth(), (int) graphicInfo.getHeight(), color);
}
protected static CustomProcessDiagramCanvas initProcessDiagramCanvas(BpmnModel bpmnModel, String imageType,
String activityFontName, String labelFontName, String annotationFontName, ClassLoader customClassLoader) {
// We need to calculate maximum values to know how big the image will be in its entirety
double minX = Double.MAX_VALUE;
double maxX = 0;
double minY = Double.MAX_VALUE;
double maxY = 0;
for (Pool pool : bpmnModel.getPools()) {
GraphicInfo graphicInfo = bpmnModel.getGraphicInfo(pool.getId());
minX = graphicInfo.getX();
maxX = graphicInfo.getX() + graphicInfo.getWidth();
minY = graphicInfo.getY();
maxY = graphicInfo.getY() + graphicInfo.getHeight();
}
List<FlowNode> flowNodes = gatherAllFlowNodes(bpmnModel);
for (FlowNode flowNode : flowNodes) {
GraphicInfo flowNodeGraphicInfo = bpmnModel.getGraphicInfo(flowNode.getId());
// width
if (flowNodeGraphicInfo.getX() + flowNodeGraphicInfo.getWidth() > maxX) {
maxX = flowNodeGraphicInfo.getX() + flowNodeGraphicInfo.getWidth();
}
if (flowNodeGraphicInfo.getX() < minX) {
minX = flowNodeGraphicInfo.getX();
}
// height
if (flowNodeGraphicInfo.getY() + flowNodeGraphicInfo.getHeight() > maxY) {
maxY = flowNodeGraphicInfo.getY() + flowNodeGraphicInfo.getHeight();
}
if (flowNodeGraphicInfo.getY() < minY) {
minY = flowNodeGraphicInfo.getY();
}
for (SequenceFlow sequenceFlow : flowNode.getOutgoingFlows()) {
List<GraphicInfo> graphicInfoList = bpmnModel.getFlowLocationGraphicInfo(sequenceFlow.getId());
if (graphicInfoList != null) {
for (GraphicInfo graphicInfo : graphicInfoList) {
// width
if (graphicInfo.getX() > maxX) {
maxX = graphicInfo.getX();
}
if (graphicInfo.getX() < minX) {
minX = graphicInfo.getX();
}
// height
if (graphicInfo.getY() > maxY) {
maxY = graphicInfo.getY();
}
if (graphicInfo.getY()< minY) {
minY = graphicInfo.getY();
}
}
}
}
}
List<Artifact> artifacts = gatherAllArtifacts(bpmnModel);
for (Artifact artifact : artifacts) {
GraphicInfo artifactGraphicInfo = bpmnModel.getGraphicInfo(artifact.getId());
if (artifactGraphicInfo != null) {
// width
if (artifactGraphicInfo.getX() + artifactGraphicInfo.getWidth() > maxX) {
maxX = artifactGraphicInfo.getX() + artifactGraphicInfo.getWidth();
}
if (artifactGraphicInfo.getX() < minX) {
minX = artifactGraphicInfo.getX();
}
// height
if (artifactGraphicInfo.getY() + artifactGraphicInfo.getHeight() > maxY) {
maxY = artifactGraphicInfo.getY() + artifactGraphicInfo.getHeight();
}
if (artifactGraphicInfo.getY() < minY) {
minY = artifactGraphicInfo.getY();
}
}
List<GraphicInfo> graphicInfoList = bpmnModel.getFlowLocationGraphicInfo(artifact.getId());
if (graphicInfoList != null) {
for (GraphicInfo graphicInfo : graphicInfoList) {
// width
if (graphicInfo.getX() > maxX) {
maxX = graphicInfo.getX();
}
if (graphicInfo.getX() < minX) {
minX = graphicInfo.getX();
}
// height
if (graphicInfo.getY() > maxY) {
maxY = graphicInfo.getY();
}
if (graphicInfo.getY()< minY) {
minY = graphicInfo.getY();
}
}
}
}
int nrOfLanes = 0;
for (Process process : bpmnModel.getProcesses()) {
for (Lane l : process.getLanes()) {
nrOfLanes++;
GraphicInfo graphicInfo = bpmnModel.getGraphicInfo(l.getId());
// // width
if (graphicInfo.getX() + graphicInfo.getWidth() > maxX) {
maxX = graphicInfo.getX() + graphicInfo.getWidth();
}
if (graphicInfo.getX() < minX) {
minX = graphicInfo.getX();
}
// height
if (graphicInfo.getY() + graphicInfo.getHeight() > maxY) {
maxY = graphicInfo.getY() + graphicInfo.getHeight();
}
if (graphicInfo.getY() < minY) {
minY = graphicInfo.getY();
}
}
}
// Special case, see https://activiti.atlassian.net/browse/ACT-1431
if (flowNodes.isEmpty() && bpmnModel.getPools().isEmpty() && nrOfLanes == 0) {
// Nothing to show
minX = 0;
minY = 0;
}
return new CustomProcessDiagramCanvas((int) maxX + 10,(int) maxY + 10, (int) minX, (int) minY,
imageType, activityFontName, labelFontName, annotationFontName, customClassLoader);
}
@Override
public InputStream generateDiagram(BpmnModel bpmnModel, String imageType, List<String> highLightedActivities,
List<String> highLightedFlows, String activityFontName, String labelFontName, String annotationFontName,
ClassLoader customClassLoader, double scaleFactor, Color[] colors, Set<String> currIds) {
CustomProcessDiagramCanvas customProcessDiagramCanvas = generateProcessDiagram(bpmnModel, imageType, highLightedActivities, highLightedFlows,
activityFontName, labelFontName, annotationFontName, customClassLoader, scaleFactor,colors, currIds);
BufferedImage bufferedImage = customProcessDiagramCanvas.generateBufferedImage(imageType);
ByteArrayOutputStream bs = new ByteArrayOutputStream();
ImageOutputStream imOut;
try {
imOut = ImageIO.createImageOutputStream(bs);
ImageIO.write(bufferedImage, "PNG", imOut);
} catch (IOException e) {
e.printStackTrace();
}
InputStream is = new ByteArrayInputStream(bs.toByteArray());
return is;
}
@Override
public InputStream generateDiagram(BpmnModel bpmnModel, String imageType, String activityFontName, String labelFontName, String annotationFontName, ClassLoader customClassLoader) {
return generateDiagram(bpmnModel, imageType, Collections.<String>emptyList(), Collections.<String>emptyList(),
activityFontName, labelFontName, annotationFontName, customClassLoader, 1.0, new Color[] {Color.BLACK, Color.BLACK}, null);
}
}
4、重写DefaultProcessDiagramCanvas类drawHighLight和drawSequenceflow方法，实现走过的历史节点高亮功能：
package com.fengunion.scf.data.workflow.manager;
import java.awt.Color;
import java.awt.Font;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.awt.Stroke;
import java.awt.font.FontRenderContext;
import java.awt.font.LineBreakMeasurer;
import java.awt.font.TextAttribute;
import java.awt.font.TextLayout;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;
import javax.imageio.ImageIO;
import org.activiti.bpmn.model.AssociationDirection;
import org.activiti.bpmn.model.GraphicInfo;
import org.activiti.image.exception.ActivitiImageException;
import org.activiti.image.impl.DefaultProcessDiagramCanvas;
import org.activiti.image.util.ReflectUtil;
import com.fengunion.scf.data.workflow.common.constant.WorkflowConstants;
public class CustomProcessDiagramCanvas extends DefaultProcessDiagramCanvas {
protected static Color LABEL_COLOR = new Color(0, 0, 0);
//font
protected String activityFontName = "宋体";
protected String labelFontName = "宋体";
protected String annotationFontName = "宋体";
private static volatile boolean flag = false;
public CustomProcessDiagramCanvas(int width, int height, int minX, int minY, String imageType) {
super(width, height, minX, minY, imageType);
}
public CustomProcessDiagramCanvas(int width, int height, int minX, int minY, String imageType,
String activityFontName, String labelFontName, String annotationFontName, ClassLoader customClassLoader) {
super(width, height, minX, minY, imageType, activityFontName, labelFontName, annotationFontName,
customClassLoader);
}
public void drawHighLight(boolean isStartOrEnd, int x, int y, int width, int height, Color color) {
Paint originalPaint = g.getPaint();
Stroke originalStroke = g.getStroke();
g.setPaint(color);
g.setStroke(MULTI_INSTANCE_STROKE);
if (isStartOrEnd) {// 开始、结束节点画圆
g.drawOval(x, y, width, height);
} else {// 非开始、结束节点画圆角矩形
RoundRectangle2D rect = new RoundRectangle2D.Double(x, y, width, height, 5, 5);
g.draw(rect);
}
g.setPaint(originalPaint);
g.setStroke(originalStroke);
}
public void drawSequenceflow(int[] xPoints, int[] yPoints, boolean conditional, boolean isDefault,
boolean highLighted, double scaleFactor, Color color) {
drawConnection(xPoints, yPoints, conditional, isDefault, "sequenceFlow", AssociationDirection.ONE, highLighted,
scaleFactor, color);
}
public void drawConnection(int[] xPoints, int[] yPoints, boolean conditional, boolean isDefault,
String connectionType, AssociationDirection associationDirection, boolean highLighted, double scaleFactor,
Color color) {
Paint originalPaint = g.getPaint();
Stroke originalStroke = g.getStroke();
g.setPaint(CONNECTION_COLOR);
if (connectionType.equals("association")) {
g.setStroke(ASSOCIATION_STROKE);
} else if (highLighted) {
g.setPaint(color);
g.setStroke(HIGHLIGHT_FLOW_STROKE);
}
for (int i = 1; i < xPoints.length; i++) {
Integer sourceX = xPoints[i - 1];
Integer sourceY = yPoints[i - 1];
Integer targetX = xPoints[i];
Integer targetY = yPoints[i];
Line2D.Double line = new Line2D.Double(sourceX, sourceY, targetX, targetY);
g.draw(line);
}
if (isDefault) {
Line2D.Double line = new Line2D.Double(xPoints[0], yPoints[0], xPoints[1], yPoints[1]);
drawDefaultSequenceFlowIndicator(line, scaleFactor);
}
if (conditional) {
Line2D.Double line = new Line2D.Double(xPoints[0], yPoints[0], xPoints[1], yPoints[1]);
drawConditionalSequenceFlowIndicator(line, scaleFactor);
}
if (associationDirection.equals(AssociationDirection.ONE)
|| associationDirection.equals(AssociationDirection.BOTH)) {
Line2D.Double line = new Line2D.Double(xPoints[xPoints.length - 2], yPoints[xPoints.length - 2],
xPoints[xPoints.length - 1], yPoints[xPoints.length - 1]);
drawArrowHead(line, scaleFactor);
}
if (associationDirection.equals(AssociationDirection.BOTH)) {
Line2D.Double line = new Line2D.Double(xPoints[1], yPoints[1], xPoints[0], yPoints[0]);
drawArrowHead(line, scaleFactor);
}
g.setPaint(originalPaint);
g.setStroke(originalStroke);
}
public void drawLabel(boolean highLighted, String text, GraphicInfo graphicInfo, boolean centered) {
float interline = 1.0f;
// text
if (text != null && text.length() > 0) {
Paint originalPaint = g.getPaint();
Font originalFont = g.getFont();
if (highLighted) {
g.setPaint(WorkflowConstants.COLOR_NORMAL);
} else {
g.setPaint(LABEL_COLOR);
}
g.setFont(new Font(labelFontName, Font.BOLD, 10));
int wrapWidth = 100;
int textY = (int) graphicInfo.getY();
// TODO: use drawMultilineText()
AttributedString as = new AttributedString(text);
as.addAttribute(TextAttribute.FOREGROUND, g.getPaint());
as.addAttribute(TextAttribute.FONT, g.getFont());
AttributedCharacterIterator aci = as.getIterator();
FontRenderContext frc = new FontRenderContext(null, true, false);
LineBreakMeasurer lbm = new LineBreakMeasurer(aci, frc);
while (lbm.getPosition() < text.length()) {
TextLayout tl = lbm.nextLayout(wrapWidth);
textY += tl.getAscent();
Rectangle2D bb = tl.getBounds();
double tX = graphicInfo.getX();
if (centered) {
tX += (int) (graphicInfo.getWidth() / 2 - bb.getWidth() / 2);
}
tl.draw(g, (float) tX, textY);
textY += tl.getDescent() + tl.getLeading() + (interline - 1.0f) * tl.getAscent();
}
// restore originals
g.setFont(originalFont);
g.setPaint(originalPaint);
}
}
@Override
public BufferedImage generateBufferedImage(String imageType) {
if (closed) {
throw new ActivitiImageException("ProcessDiagramGenerator already closed");
}
// Try to remove white space
minX = (minX <= WorkflowConstants.PROCESS_PADDING) ? WorkflowConstants.PROCESS_PADDING : minX;
minY = (minY <= WorkflowConstants.PROCESS_PADDING) ? WorkflowConstants.PROCESS_PADDING : minY;
BufferedImage imageToSerialize = processDiagram;
if (minX >= 0 && minY >= 0) {
imageToSerialize = processDiagram.getSubimage(
minX - WorkflowConstants.PROCESS_PADDING,
minY - WorkflowConstants.PROCESS_PADDING,
canvasWidth - minX + WorkflowConstants.PROCESS_PADDING,
canvasHeight - minY + WorkflowConstants.PROCESS_PADDING);
}
return imageToSerialize;
}
@Override
public void initialize(String imageType) {
this.processDiagram = new BufferedImage(canvasWidth, canvasHeight, BufferedImage.TYPE_INT_ARGB);
this.g = processDiagram.createGraphics();
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g.setPaint(Color.black);
Font font = new Font(activityFontName, Font.BOLD, FONT_SIZE);
g.setFont(font);
this.fontMetrics = g.getFontMetrics();
LABEL_FONT = new Font(labelFontName, Font.ITALIC, 10);
ANNOTATION_FONT = new Font(annotationFontName, Font.PLAIN, FONT_SIZE);
//优化加载速度
if(flag) {
return;
}
try {
USERTASK_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/userTask.png", customClassLoader));
SCRIPTTASK_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/scriptTask.png", customClassLoader));
SERVICETASK_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/serviceTask.png", customClassLoader));
RECEIVETASK_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/receiveTask.png", customClassLoader));
SENDTASK_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/sendTask.png", customClassLoader));
MANUALTASK_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/manualTask.png", customClassLoader));
BUSINESS_RULE_TASK_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/businessRuleTask.png", customClassLoader));
SHELL_TASK_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/shellTask.png", customClassLoader));
CAMEL_TASK_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/camelTask.png", customClassLoader));
MULE_TASK_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/muleTask.png", customClassLoader));
TIMER_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/timer.png", customClassLoader));
COMPENSATE_THROW_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/compensate-throw.png", customClassLoader));
COMPENSATE_CATCH_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/compensate.png", customClassLoader));
ERROR_THROW_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/error-throw.png", customClassLoader));
ERROR_CATCH_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/error.png", customClassLoader));
MESSAGE_THROW_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/message-throw.png", customClassLoader));
MESSAGE_CATCH_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/message.png", customClassLoader));
SIGNAL_THROW_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/signal-throw.png", customClassLoader));
SIGNAL_CATCH_IMAGE = ImageIO.read(ReflectUtil.getResource("org/activiti/icons/signal.png", customClassLoader));
/* String baseUrl = Thread.currentThread().getContextClassLoader().getResource("static/img/activiti/").getPath();
SCRIPTTASK_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"scriptTask.png"));
USERTASK_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"userTask.png"));
SERVICETASK_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"serviceTask.png"));
RECEIVETASK_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"receiveTask.png"));
SENDTASK_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"sendTask.png"));
MANUALTASK_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"manualTask.png"));
BUSINESS_RULE_TASK_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"businessRuleTask.png"));
SHELL_TASK_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"shellTask.png"));
CAMEL_TASK_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"camelTask.png"));
MULE_TASK_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"muleTask.png"));
TIMER_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"timer.png"));
COMPENSATE_THROW_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"compensate-throw.png"));
COMPENSATE_CATCH_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"compensate.png"));
ERROR_THROW_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"error-throw.png"));
ERROR_CATCH_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"error.png"));
MESSAGE_THROW_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"message-throw.png"));
MESSAGE_CATCH_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"message.png"));
SIGNAL_THROW_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"signal-throw.png"));
SIGNAL_CATCH_IMAGE = ImageIO.read(new FileInputStream(baseUrl+"signal.png"));*/
flag = true;
} catch (IOException e) {
flag = false;
LOGGER.warn("Could not load image for process diagram creation: {}", e.getMessage());
}
}
}
总结：核心思想就是重写Activiti生成动态流程图的方法(需要重写画节点、画线的方法)，增加颜色配置参数。
鉴于有小伙伴私信找我要自定义的常量类，现将WorkflowConstants类奉上：
package com.fengunion.scf.data.workflow.common.constant;
import com.google.common.collect.Lists;
import java.awt.Color;
import java.util.List;
/**
* 变量类
*@author jjd
**/
public final class WorkflowConstants {
/**businessKey**/
public static final String WORKLOW_BUSINESS_KEY = "businessKey";
/**按钮网关**/
public static final String WAY_TYPE = "wayType";
/**按钮网关**/
public static final String WAY_TYPE_PREFIX = "way_type_";
/**项目id**/
public static final String PROJECT_ID = "projectId";
/**核心企业Id变量**/
public static final String CORE_ENTERPRISE_ID="coreEnterpriseId";
/**链属企业Id变量**/
public static final String CHAIN_ENTERPRISE_ID="chainEnterpriseId";
/**银行企业Id变量**/
public static final String BANK_ENTERPRISE_ID="bankEnterpriseId";
/**保理公司Id变量**/
public static final String BAOLI_ENTERPRISE_ID="baoliEnterpriseId";
/**立账开立企业Id变量**/
public static final String START_ENTERPRISE_ID="startEnterpriseId";
/**立账合作企业Id变量**/
public static final String PARTNER_ENTERPRISE_ID="partnerEnterpriseId";
/**母公司企业id**/
public static final String PARENT_ENTERPRISE_ID="parentEnterpriseId";
/**指定签收企业id**/
public static final String RECEIVE_ENTERPRISE_ID ="receiveEnterpriseId";
/**转出方企业Id变量**/
public static final String TRANSFER_ENTERPRISE_ID="transEnterpriseId";
/**指定签收企业id**/
public static final String AC_TASK_ID ="acTaskId";
/**企业所有角色**/
public static final String ENT_ALL_ROLE ="all";
/**运营所有角色**/
public static final String OPER_ALL_ROLE ="oper";
/**流程定义缓存时间**/
public static final int PROCESS_DEFINITION_CACHE = 60;
/**流程实例激活**/
public static final int PROCESS_INSTANCE_ACTIVE = 1;
/**流程实例挂起**/
public static final int PROCESS_INSTANCE_SUSPEND = 0;
/**读取图片**/
public static final String READ_IMAGE = "image";
/**读取xml**/
public static final String READ_XML = "xml";
/**流程激活**/
public static final Integer ACTIVE_PROCESSDEFINITION = 1;
/**流程挂起**/
public static final Integer SUSPEND_PROCESSDEFINITION = 2;
/**流程状态：0-全部，1-正常，2-已挂起**/
public static final int QUERY_ALL = 0;
public static final int QUERY_NORMAL = 1;
public static final int QUERY_SUSPENDED = 2;
/**流程实例状态：0-全部，1-正常，2-已删除**/
public static final int INSTANCE_ALL = 0;
public static final int INSTANCE_NOT_DELETED = 1;
public static final int INSTANCE_DELETED = 2;
/** 系统管理员ID **/
public static final String INTERFACE_SYSTEM_ID = "-1";
/** 系统管理员名称 **/
public static final String INTERFACE_SYSTEM_NAME = "系统操作";
/** 流程部署类型:1-启动并激活，2-启动即挂起 **/
public static final int PROCESS_START_ACTIVE = 1;
public static final int PROCESS_START_SUSPEND = 2;
/** 用于标识流程项目配置信息校验结果：1：新流程，2：新版本， 3：流程类别有误 **/
public static final int CHECK_NEW_PROCESS = 1;
public static final int CHECK_NEW_VERSION = 2;
public static final int CHECK_ERROR_PROCESS_TYPE = 3;
/** 默认网关条件值 **/
public static final Integer default_GATEWAY_CONDITION_VALUE = 1;
/** 工作流-业务状态表数据类型：1-工作流状态，2-业务状态 **/
public static final Integer PROCESS_STATUS = 1;
public static final Integer BIZNESS_STATUS = 2;
/** 新增流程时标识：1-直接保存，2-提示覆盖 **/
public static final Integer PROCESS_STATUS_SAVE = 1;
public static final Integer BIZNESS_STATUS_WARN = 2;
/** 模板类型标识：1-新创建或直接导入的模板，2-默认模板生成 **/
public static final Integer MODEL_TYPE_1 = 1;
public static final Integer MODEL_TYPE_2 = 2;
/** 查询流程定义标识：1-查询最新版本流程定义，2-查询所有版本 **/
public static final Integer QUERY_PROCESS_LATEST_VERSION = 1;
public static final Integer QUERY_PROCESS_ALL_VERSION = 2;
/** 按钮网关 通过1 */
public static final String WAY_TYPE_PASS = "1";
/** 按钮网关 驳回或结束0 */
public static final String WAY_TYPE_REJECT = "0";
/** 按钮网关 退回2 */
public static final String WAY_TYPE_BACK = "2";
/**任务参数为空**/
public static final int TASK_CHECK_PARAM_NULL = -1;
/**任务已办理**/
public static final int TASK_CHECK_COMPLETED = 1;
/**无权限办理**/
public static final int TASK_CHECK_NO_PERMISSIONS= 2;
/**任务校验通过**/
public static final int TASK_CHECK_PASS = 0;
/** 动态流程图颜色定义 **/
public static final Color COLOR_NORMAL = new Color(0, 205, 0);
public static final Color COLOR_CURRENT = new Color(255, 0, 0);
/** 定义生成流程图时的边距(像素) **/
public static final int PROCESS_PADDING = 5;
/** 定义新版业务进度查询包含的流程类型 **/
public static final List<ProcessTypeEnum> INCLUDE_PROCEE_TYPE = Lists.newArrayList(
ProcessTypeEnum.BUILD_ACCOUNT_APPLY,
ProcessTypeEnum.CREDIT_LETTER_APPLY,
ProcessTypeEnum.CREDIT_LETTER_TRANSFER,
ProcessTypeEnum.CREDIT_LETTER_CASH);
}
5、调用画图service层
/**
* @读取动态流程图
*/
public void readProcessImg(String processInstanceId, HttpServletResponse response) throws IOException {
if (StringUtils.isBlank(processInstanceId)) {
logger.error("参数为空");
}
HistoricProcessInstance processInstance = historyService.createHistoricProcessInstanceQuery()
.processInstanceId(processInstanceId).singleResult();
BpmnModel bpmnModel = repositoryService.getBpmnModel(processInstance.getProcessDefinitionId());
ProcessDefinitionEntity definitionEntity = (ProcessDefinitionEntity) repositoryService
.getProcessDefinition(processInstance.getProcessDefinitionId());
List<HistoricActivityInstance> highLightedActivitList = historyService.createHistoricActivityInstanceQuery()
.processInstanceId(processInstanceId).orderByHistoricActivityInstanceStartTime().asc().list();
// 高亮环节id集合
List<String> highLightedActivitis = new ArrayList<String>();
// 高亮线路id集合
List<String> highLightedFlows = getHighLightedFlows(definitionEntity, highLightedActivitList);
for (HistoricActivityInstance tempActivity : highLightedActivitList) {
String activityId = tempActivity.getActivityId();
highLightedActivitis.add(activityId);
}
Set<String> currIds = runtimeService.createExecutionQuery().processInstanceId(processInstance.getId()).list()
.stream().map(e->e.getActivityId()).collect(Collectors.toSet());
CustomProcessDiagramGeneratorI diagramGenerator = (CustomProcessDiagramGeneratorI) processEngineConfiguration
.getProcessDiagramGenerator();
InputStream imageStream = diagramGenerator.generateDiagram(bpmnModel, "png", highLightedActivitis,
highLightedFlows, "宋体", "宋体", "宋体", null, 1.0, new Color[] { WorkflowConstants.COLOR_NORMAL, WorkflowConstants.COLOR_CURRENT }, currIds);
// 输出资源内容到相应对象
byte[] b = new byte[1024];
int len;
while ((len = imageStream.read(b, 0, 1024)) != -1) {
response.getOutputStream().write(b, 0, len);
}
}
6、getHighLightedFlows方法调整为如下：
/**
* 获取需要高亮的线
*
* @param processDefinitionEntity
* @param historicActivityInstances
* @return
*/
private List<String> getHighLightedFlows(ProcessDefinitionEntity processDefinitionEntity,
List<HistoricActivityInstance> historicActivityInstances) {
List<String> highFlows = new ArrayList<>();// 用以保存高亮的线flowId
for (int i = 0; i < historicActivityInstances.size() - 1; i++) {// 对历史流程节点进行遍历
ActivityImpl activityImpl = processDefinitionEntity
.findActivity(historicActivityInstances.get(i).getActivityId());// 得到节点定义的详细信息
List<ActivityImpl> sameStartTimeNodes = new ArrayList<>();// 用以保存后需开始时间相同的节点
ActivityImpl sameActivityImpl1 = processDefinitionEntity
.findActivity(historicActivityInstances.get(i + 1).getActivityId());
// 将后面第一个节点放在时间相同节点的集合里
sameStartTimeNodes.add(sameActivityImpl1);
for (int j = i + 1; j < historicActivityInstances.size() - 1; j++) {
HistoricActivityInstance activityImpl1 = historicActivityInstances.get(j);// 后续第一个节点
HistoricActivityInstance activityImpl2 = historicActivityInstances.get(j + 1);// 后续第二个节点
if (Math.abs(activityImpl1.getStartTime().getTime()-activityImpl2.getStartTime().getTime()) < 200) {
// if (activityImpl1.getStartTime().equals(activityImpl2.getStartTime())) {
// 如果第一个节点和第二个节点开始时间相同保存
ActivityImpl sameActivityImpl2 = processDefinitionEntity
.findActivity(activityImpl2.getActivityId());
sameStartTimeNodes.add(sameActivityImpl2);
} else {
// 有不相同跳出循环
break;
}
}
List<PvmTransition> pvmTransitions = activityImpl.getOutgoingTransitions();// 取出节点的所有出去的线
for (PvmTransition pvmTransition : pvmTransitions) {
// 对所有的线进行遍历
ActivityImpl pvmActivityImpl = (ActivityImpl) pvmTransition.getDestination();
// 如果取出的线的目标节点存在时间相同的节点里，保存该线的id，进行高亮显示
if (sameStartTimeNodes.contains(pvmActivityImpl)) {
highFlows.add(pvmTransition.getId());
}
}
}
return highFlows;
}
附20190319日修改内容：
鉴于有小伙伴@dou666999向我反映并行网关的高亮显示有问题，在他的热心帮助下，我修改了部分代码，以支持并行网关，在此感谢！
附20191009日温馨提示：
不少小伙伴反映本地运行一切正常，打包后部署到服务器上出现流程节点内的文字显示不了的问题，简友@1024小嘿铁
找到了原因及解决办法：流程节点的文字信息可能被覆盖了，将节点边框拉宽就好，小伙伴们不妨一试。在此感谢！！！
感谢大家的关注！
