jbpm4.4根据.jpdl.xml流程定义文件,得到流程图.png

http://www.oecp.cn/hi/yangtaoorange/blog/5804
只需将.jpdl.xml文件传过来，就可以根据这个文件解析出来.png图片

http://javaintelligence.blogspot.com/2010/08/jboss-jbpm-generating-image-at-runtime.html
写到:
Was tested with the latest version of JBPM 4.4 and works normally.
The following is a direct access to source code containing also the icons. The icons are extracted from a JAR used by the modeler of the eclipse ide.
http://www.planetacontabil.com.br/jbpm_image_sample.jar

先看节点类的定义:

public class Node {   
  private String name;   
  private String type;   
  private Rectangle rectangle;   
  private List<Transition> transitions = new ArrayList<Transition>();   
  
  public Node(String name, String type) {   
    this.name = name;   
    this.type = type;   
  }   
  
  public Node(String name, String type, int x, int y, int w, int h) {   
    this.name = name;   
    this.type = type;   
    this.rectangle = new Rectangle(x, y, w, h);   
  }   
  
  public Rectangle getRectangle() {   
    return rectangle;   
  }   
  
  public void setRectangle(Rectangle rectangle) {   
    this.rectangle = rectangle;   
  }   
  
  public String getType() {   
    return type;   
  }   
  
  public void setType(String type) {   
    this.type = type;   
  }   
  
  public String getName() {   
    return name;   
  }   
  
  public void setName(String name) {   
    this.name = name;   
  }   
  
  public void addTransition(Transition transition) {   
    transitions.add(transition);   
  }   
  
  public List<Transition> getTransitions() {   
    return transitions;   
  }   
  
  public void setTransitions(List<Transition> transitions) {   
    this.transitions = transitions;   
  }   
  
  public int getX() {   
    return rectangle.x;   
  }   
  
  public int getY() {   
    return rectangle.y;   
  }   
  
  public int getCenterX() {   
    return (int) rectangle.getCenterX();   
  }   
  
  public int getCenterY() {   
    return (int) rectangle.getCenterY();   
  }   
  
  public int getWitdth() {   
    return rectangle.width;   
  }   
  
  public int getHeight() {   
    return rectangle.height;   
  }   
}  

其次是Transition的定义:

public class Transition {   
  private Point labelPosition;   
  private List<Point> lineTrace = new ArrayList<Point>();   
  private String label;   
  private String to;   
  
  public Transition(String label, String to) {   
    this.label = label;   
    this.to = to;   
  }   
  
  public Point getLabelPosition() {   
    return labelPosition;   
  }   
  
  public void setLabelPosition(Point labelPosition) {   
    this.labelPosition = labelPosition;   
  }   
  
  public List<Point> getLineTrace() {   
    return lineTrace;   
  }   
  
  public void setLineTrace(List<Point> lineTrace) {   
    this.lineTrace = lineTrace;   
  }   
  
  public void addLineTrace(Point lineTrace) {   
    if (lineTrace != null) {   
      this.lineTrace.add(lineTrace);   
    }   
  }   
  
  public String getLabel() {   
    return label;   
  }   
  public void setLabel(String label) {   
    this.label = label;   
  }   
  
  public String getTo() {   
    return to;   
  }   
  
  public void setTo(String to) {   
    this.to = to;   
  }   
  
}  

类JpdlModel

/**  
 * CopyRight (C) 2006-2009 yy  
 * @author yy  
 * @project jbpm  
 * @version 1.0  
 * @mail yy629_86 at 163 dot com  
 * @date 2009-9-6 下午06:00:14  
 * @description  
 */  
package sofocus.bpm.jbpm.jpdl.model;   
  
import java.awt.Point;   
import java.io.InputStream;   
import java.util.HashMap;   
import java.util.LinkedHashMap;   
import java.util.List;   
import java.util.Map;   
  
import org.dom4j.Element;   
import org.dom4j.io.SAXReader;   
  
public class JpdlModel {   
  private Map<String, Node> nodes = new LinkedHashMap<String, Node>();   
  public static final int RECT_OFFSET_X = -7;   
  public static final int RECT_OFFSET_Y = -8;   
  public static final int DEFAULT_PIC_SIZE = 48;   
  
  private final static Map<String, Object> nodeInfos = new HashMap<String, Object>();   
  static {   
    nodeInfos.put("start", "start_event_empty.png");   
    nodeInfos.put("end", "end_event_terminate.png");   
    nodeInfos.put("end-cancel", "end_event_cancel.png");   
    nodeInfos.put("end-error", "end_event_error.png");   
    nodeInfos.put("decision", "gateway_exclusive.png");   
    nodeInfos.put("fork", "gateway_parallel.png");   
    nodeInfos.put("join", "gateway_parallel.png");   
    nodeInfos.put("state", null);   
    nodeInfos.put("hql", null);   
    nodeInfos.put("sql", null);   
    nodeInfos.put("java", null);   
    nodeInfos.put("script", null);   
    nodeInfos.put("task", null);   
    nodeInfos.put("sub-process", null);   
    nodeInfos.put("custom", null);   
  }   
  
  public JpdlModel(InputStream is) throws Exception {   
    this(new SAXReader().read(is).getRootElement());   
  }   
  
  @SuppressWarnings("unchecked")   
  private JpdlModel(Element rootEl) throws Exception {   
    for (Element el : (List<Element>) rootEl.elements()) {   
      String type = el.getQName().getName();   
      if (!nodeInfos.containsKey(type)) { // 不是可展示的节点   
        continue;   
      }   
      String name = null;   
      if (el.attribute("name") != null) {   
        name = el.attributeValue("name");   
      }   
      String[] location = el.attributeValue("g").split(",");   
      int x = Integer.parseInt(location[0]);   
      int y = Integer.parseInt(location[1]);   
      int w = Integer.parseInt(location[2]);   
      int h = Integer.parseInt(location[3]);   
  
      if (nodeInfos.get(type) != null) {   
        w = DEFAULT_PIC_SIZE;   
        h = DEFAULT_PIC_SIZE;   
      } else {   
        x -= RECT_OFFSET_X;   
        y -= RECT_OFFSET_Y;   
        w += (RECT_OFFSET_X + RECT_OFFSET_X);   
        h += (RECT_OFFSET_Y + RECT_OFFSET_Y);   
      }   
      Node node = new Node(name, type, x, y, w, h);   
      parserTransition(node, el);   
      nodes.put(name, node);   
    }   
  }   
  
  @SuppressWarnings("unchecked")   
  private void parserTransition(Node node, Element nodeEl) {   
    for (Element el : (List<Element>) nodeEl.elements("transition")) {   
      String label = el.attributeValue("name");   
      String to = el.attributeValue("to");   
      Transition transition = new Transition(label, to);   
      String g = el.attributeValue("g");   
      if (g != null && g.length() > 0) {   
        if (g.indexOf(":") < 0) {   
          transition.setLabelPosition(getPoint(g));   
        } else {   
          String[] p = g.split(":");   
          transition.setLabelPosition(getPoint(p[1]));   
          String[] lines = p[0].split(";");   
          for (String line : lines) {   
            transition.addLineTrace(getPoint(line));   
          }   
        }   
      }   
      node.addTransition(transition);   
    }   
  }   
  
  private Point getPoint(String exp) {   
    if (exp == null || exp.length() == 0) {   
      return null;   
    }   
    String[] p = exp.split(",");   
    return new Point(Integer.valueOf(p[0]), Integer.valueOf(p[1]));   
  }   
  
  public Map<String, Node> getNodes() {   
    return nodes;   
  }   
    public static Map<String, Object> getNodeInfos() {   
    return nodeInfos;   
  }   
} 

根据JpdlModel绘制出流程图

/**  
 * CopyRight (C) 2006-2009 yy  
 * @author yy  
 * @project Jbpm  
 * @version 1.0  
 * @mail yy629_86 at 163 dot com  
 * @date 2009-9-6 下午06:00:14  
 * @description  
 */  
package sofocus.bpm.jbpm.jpdl;   
  
import java.awt.*;   
import java.awt.font.FontRenderContext;   
import java.awt.geom.Rectangle2D;   
import java.awt.image.BufferedImage;   
import java.io.IOException;   
import java.util.List;   
import java.util.Map;   
  
import javax.imageio.ImageIO;   
  
import sofocus.bpm.jbpm.jpdl.model.JpdlModel;   
import sofocus.bpm.jbpm.jpdl.model.Node;   
import sofocus.bpm.jbpm.jpdl.model.Transition;   
  
/**
 * @author yeyong  
 *   
 */  
public class JpdlModelDrawer {   
  public static final int RECT_OFFSET_X = JpdlModel.RECT_OFFSET_X;   
  public static final int RECT_OFFSET_Y = JpdlModel.RECT_OFFSET_Y;   
  public static final int RECT_ROUND = 25;   
  
  public static final int DEFAULT_FONT_SIZE = 12;   
  
  public static final Color DEFAULT_STROKE_COLOR = Color.decode("#03689A");   
  public static final Stroke DEFAULT_STROKE = new BasicStroke(2);   
  
  public static final Color DEFAULT_LINE_STROKE_COLOR = Color.decode("#808080");   
  public static final Stroke DEFAULT_LINE_STROKE = new BasicStroke(1);   
  
  public static final Color DEFAULT_FILL_COLOR = Color.decode("#F6F7FF");   
  
  private final static Map<String, Object> nodeInfos = JpdlModel.getNodeInfos();   
  
  public BufferedImage draw(JpdlModel jpdlModel) throws IOException {   
    Rectangle dimension = getCanvasDimension(jpdlModel);   
    BufferedImage bi = new BufferedImage(dimension.width, dimension.height, BufferedImage.TYPE_INT_ARGB);   
    Graphics2D g2 = bi.createGraphics();   
    g2.setColor(Color.WHITE);   
    g2.fillRect(0, 0, dimension.width, dimension.height);   
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);   
    Font font = new Font("宋体", Font.PLAIN, DEFAULT_FONT_SIZE);   
    g2.setFont(font);   
    Map<String, Node> nodes = jpdlModel.getNodes();   
    drawNode(nodes, g2, font);   
    drawTransition(nodes, g2);   
    return bi;   
  }   
  
  /**
   * 获得图片的矩形大小  
   *   
   * @return  
   */  
  private Rectangle getCanvasDimension(JpdlModel jpdlModel) {   
    Rectangle rectangle = new Rectangle();   
    Rectangle rect;   
    for (Node node : jpdlModel.getNodes().values()) {   
      rect = node.getRectangle();   
      if (rect.getMaxX() > rectangle.getMaxX()) {   
        rectangle.width = (int) rect.getMaxX();   
      }   
      if (rect.getMaxY() > rectangle.getMaxY()) {   
        rectangle.height = (int) rect.getMaxY();   
      }   
      for (Transition transition : node.getTransitions()) {   
        List<Point> trace = transition.getLineTrace();   
        for (Point point : trace) {   
          if (rectangle.getMaxX() < point.x) {   
            rectangle.width = point.x;   
          }   
          if (rectangle.getMaxY() < point.y) {   
            rectangle.height = point.y;   
          }   
        }   
      }   
    }   
    rectangle.width += 60;   
    rectangle.height += 20;   
    return rectangle;   
  }   
  
  /**
   * @param g2  
   * @throws IOException  
   */  
  private void drawTransition(Map<String, Node> nodes, Graphics2D g2) throws IOException {   
    g2.setStroke(DEFAULT_LINE_STROKE);   
    g2.setColor(DEFAULT_LINE_STROKE_COLOR);   
    for (Node node : nodes.values()) {   
      for (Transition transition : node.getTransitions()) {   
        String to = transition.getTo();   
        Node toNode = nodes.get(to);   
        List<Point> trace = new LinkedList<Point>(transition.getLineTrace());   
        int len = trace.size() + 2;   
        trace.add(0, new Point(node.getCenterX(), node.getCenterY()));   
        trace.add(new Point(toNode.getCenterX(), toNode.getCenterY()));   
        int[] xPoints = new int[len];   
        int[] yPoints = new int[len];   
        for (int i = 0; i < len; i++) {   
          xPoints[i] = trace.get(i).x;   
          yPoints[i] = trace.get(i).y;   
        }   
        final int taskGrow = 4;   
        final int smallGrow = -2;   
        int grow = 0;   
        if (nodeInfos.get(node.getType()) != null) {   
          grow = smallGrow;   
        } else {   
          grow = taskGrow;   
        }   
        Point p = GeometryUtils.getRectangleLineCrossPoint(node.getRectangle(), new Point(xPoints[1],   
            yPoints[1]), grow);   
        if (p != null) {   
          xPoints[0] = p.x;   
          yPoints[0] = p.y;   
        }   
        if (nodeInfos.get(toNode.getType()) != null) {   
          grow = smallGrow;   
        } else {   
          grow = taskGrow;   
        }   
        p = GeometryUtils.getRectangleLineCrossPoint(toNode.getRectangle(), new Point(xPoints[len - 2],   
            yPoints[len - 2]), grow);   
        if (p != null) {   
          xPoints[len - 1] = p.x;   
          yPoints[len - 1] = p.y;   
        }   
        g2.drawPolyline(xPoints, yPoints, len);   
        drawArrow(g2, xPoints[len - 2], yPoints[len - 2], xPoints[len - 1], yPoints[len - 1]);   
        String label = transition.getLabel();   
        if (label != null && label.length() > 0) {   
          int cx, cy;   
          if (len % 2 == 0) {   
            cx = (xPoints[len / 2 - 1] + xPoints[len / 2]) / 2;   
            cy = (yPoints[len / 2 - 1] + yPoints[len / 2]) / 2;   
          } else {   
            cx = xPoints[len / 2];   
            cy = yPoints[len / 2];   
          }   
          Point labelPoint = transition.getLabelPosition();   
          if (labelPoint != null) {   
            cx += labelPoint.x;   
            cy += labelPoint.y;   
          }   
          cy -= RECT_OFFSET_Y + RECT_OFFSET_Y / 2;   
          g2.drawString(label, cx, cy);   
        }   
      }   
    }   
  }   
  
  private void drawArrow(Graphics2D g2, int x1, int y1, int x2, int y2) {   
    final double len = 8.0;   
    double slopy = Math.atan2(y2 - y1, x2 - x1);   
    double cosy = Math.cos(slopy);   
    double siny = Math.sin(slopy);   
    int[] xPoints = { 0, x2, 0 };   
    int[] yPoints = { 0, y2, 0 };   
    double a = len * siny, b = len * cosy;   
    double c = len / 2.0 * siny, d = len / 2.0 * cosy;   
    xPoints[0] = x2 - (int) (b + c);   
    yPoints[0] = y2 - (int) (a - d);   
    xPoints[2] = x2 - (int) (b - c);   
    yPoints[2] = y2 - (int) (d + a);   
       
    g2.fillPolygon(xPoints, yPoints, 3);   
  }   
  
  /**
   * @param g2  
   * @throws IOException  
   */  
  private void drawNode(Map<String, Node> nodes, Graphics2D g2, Font font) throws IOException {   
    for (Node node : nodes.values()) {   
      String name = node.getName();   
      if (nodeInfos.get(node.getType()) != null) {   
        BufferedImage bi2 = ImageIO.read(getClass().getResourceAsStream(   
            "/icons/48/" + nodeInfos.get(node.getType())));   
        g2.drawImage(bi2, node.getX(), node.getY(), null);   
      } else {   
        int x = node.getX();   
        int y = node.getY();   
        int w = node.getWitdth();   
        int h = node.getHeight();   
        g2.setColor(DEFAULT_FILL_COLOR);   
        g2.fillRoundRect(x, y, w, h, RECT_ROUND, RECT_ROUND);   
        g2.setColor(DEFAULT_STROKE_COLOR);   
        g2.setStroke(DEFAULT_STROKE);   
        g2.drawRoundRect(x, y, w, h, RECT_ROUND, RECT_ROUND);   
  
        FontRenderContext frc = g2.getFontRenderContext();   
        Rectangle2D r2 = font.getStringBounds(name, frc);   
        int xLabel = (int) (node.getX() + ((node.getWitdth() - r2.getWidth()) / 2));   
        int yLabel = (int) ((node.getY() + ((node.getHeight() - r2.getHeight()) / 2)) - r2.getY());   
        g2.setStroke(DEFAULT_LINE_STROKE);   
        g2.setColor(Color.black);   
        g2.drawString(name, xLabel, yLabel);   
      }   
    }   
  }   
}  

工具类,用来计算一些坐标的

/**  
 * CopyRight (C) 2006-2009 yy  
 * @author yy  
 * @project jbpm  
 * @version 1.0  
 * @mail yy629_86 at 163 dot com  
 * @date 2009-9-11 上午06:16:26  
 * @description  
 */  
package sofocus.bpm.jbpm.jpdl;   
  
import java.awt.Point;   
import java.awt.Rectangle;   
  
/**
 * @author yeyong  
 *   
 */  
public class GeometryUtils {   
  /**
   * 获得直线(x1,y1)-(x2,y2)的斜率  
   *   
   * @param x1  
   * @param y1  
   * @param x2  
   * @param y2  
   * @return  
   */  
  public static double getSlope(int x1, int y1, int x2, int y2) {   
    return ((double) y2 - y1) / (x2 - x1);   
  }   
  
  /**
   * 获得直线(x1,y1)-(x2,y2)的y轴截距  
   *   
   * @param x1  
   * @param y1  
   * @param x2  
   * @param y2  
   * @return  
   */  
  public static double getYIntercep(int x1, int y1, int x2, int y2) {   
    return y1 - x1 * getSlope(x1, y1, x2, y2);   
  }   
  /**
   * 获得矩形的中点  
   *   
   * @param rect  
   * @return  
   */  
  public static Point getRectangleCenter(Rectangle rect) {   
    return new Point((int) rect.getCenterX(), (int) rect.getCenterY());   
  }   
  
  /**
   * 获得矩形中心p0与p1的线段和矩形的交点  
   *   
   * @param rectangle  
   * @param p1  
   * @return  
   */  
  public static Point getRectangleLineCrossPoint(Rectangle rectangle, Point p1, int grow) {   
    Rectangle rect = rectangle.getBounds();   
    rect.grow(grow, grow);   
    Point p0 = GeometryUtils.getRectangleCenter(rect);   
  
    if (p1.x == p0.x) {   
      if (p1.y < p0.y) {   
        return new Point(p0.x, rect.y);   
      }   
      return new Point(p0.x, rect.y + rect.height);   
    }   
  
    if (p1.y == p0.y) {   
      if (p1.x < p0.x) {   
        return new Point(rect.x, p0.y);   
      }   
      return new Point(rect.x + rect.width, p0.y);   
    }   
  
    double slope = GeometryUtils.getSlope(p0.x, p0.y, rect.x, rect.y);   
    double slopeLine = GeometryUtils.getSlope(p0.x, p0.y, p1.x, p1.y);   
    double yIntercep = GeometryUtils.getYIntercep(p0.x, p0.y, p1.x, p1.y);   
  
    if (Math.abs(slopeLine) > slope - 1e-2) {   
      if (p1.y < rect.y) {   
        return new Point((int) ((rect.y - yIntercep) / slopeLine), rect.y);   
      } else {   
        return new Point((int) ((rect.y + rect.height - yIntercep) / slopeLine), rect.y + rect.height);   
      }   
    }   
    if (p1.x < rect.x) {   
      return new Point(rect.x, (int) (slopeLine * rect.x + yIntercep));   
    } else {   
      return new Point(rect.x + rect.width, (int) (slopeLine * (rect.x + rect.width) + yIntercep));   
    }   
  }   
}

 


测试

public static void main(String[] args) {
		try {
			File file = new File("D:/test.jpdl.xml");
			InputStream is = new FileInputStream(file);
			JpdlModel jpdlModel = new JpdlModel(is);
			ImageIO.write(new JpdlModelDrawer().draw(jpdlModel), "png",
					new File("D:/test.png"));

		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}

	}