ProcessDiagramCanvas.java

/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.bpmn.diagram;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Polygon;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Stroke;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Logger;

import javax.imageio.ImageIO;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.impl.util.IoUtil;
import org.activiti.engine.impl.util.ReflectUtil;

/**
 * Represents a canvas on which BPMN 2.0 constructs can be drawn.
 * 
 * Some of the icons used are licenced under a Creative Commons Attribution 2.5
 * License, see http://www.famfamfam.com/lab/icons/silk/
 * 
 * @see ProcessDiagramGenerator
 * @author Joram Barrez
 */
public class ProcessDiagramCanvas {

  protected static final Logger LOGGER = Logger.getLogger(ProcessDiagramCanvas.class.getName());

  // Predefined sized
  protected static final int ARROW_WIDTH = 5;
  protected static final int CONDITIONAL_INDICATOR_WIDTH = 16;
  protected static final int MARKER_WIDTH = 12;

  // Colors
  protected static Color TASK_COLOR = new Color(255, 255, 204);
  protected static Color BOUNDARY_EVENT_COLOR = new Color(255, 255, 255);
  protected static Color CONDITIONAL_INDICATOR_COLOR = new Color(255, 255, 255);
  protected static Color HIGHLIGHT_COLOR = Color.RED;

  // Strokes
  protected static Stroke THICK_TASK_BORDER_STROKE = new BasicStroke(3.0f);
  protected static Stroke GATEWAY_TYPE_STROKE = new BasicStroke(3.0f);
  protected static Stroke END_EVENT_STROKE = new BasicStroke(3.0f);
  protected static Stroke MULTI_INSTANCE_STROKE = new BasicStroke(1.3f);
  protected static Stroke EVENT_SUBPROCESS_STROKE = new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 1.0f,  new float[] { 1.0f }, 0.0f);

  // icons
  protected static int ICON_SIZE = 16;
  protected static Image USERTASK_IMAGE;
  protected static Image SCRIPTTASK_IMAGE;
  protected static Image SERVICETASK_IMAGE;
  protected static Image RECEIVETASK_IMAGE;
  protected static Image SENDTASK_IMAGE;
  protected static Image MANUALTASK_IMAGE;
  protected static Image BUSINESS_RULE_TASK_IMAGE;
  protected static Image TIMER_IMAGE;
  protected static Image ERROR_THROW_IMAGE;
  protected static Image ERROR_CATCH_IMAGE;
  protected static Image SIGNAL_CATCH_IMAGE;
  protected static Image SIGNAL_THROW_IMAGE;

  // icons are statically loaded for performace
  static {
    try {
      USERTASK_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/user.png"));
      SCRIPTTASK_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/script.png"));
      SERVICETASK_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/service.png"));
      RECEIVETASK_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/receive.png"));
      SENDTASK_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/send.png"));
      MANUALTASK_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/manual.png"));
      BUSINESS_RULE_TASK_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/business_rule.png"));
      TIMER_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/timer.png"));
      ERROR_THROW_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/error_throw.png"));
      ERROR_CATCH_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/error_catch.png"));
      SIGNAL_CATCH_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/signal_catch.png"));
      SIGNAL_THROW_IMAGE = ImageIO.read(ReflectUtil.getResourceAsStream("org/activiti/engine/impl/bpmn/deployer/signal_throw.png"));
    } catch (IOException e) {
      LOGGER.warning("Could not load image for process diagram creation: " + e.getMessage());
    }
  }

  protected int canvasWidth = -1;
  protected int canvasHeight = -1;
  protected int minX = -1;
  protected int minY = -1;
  protected BufferedImage processDiagram;
  protected Graphics2D g;
  protected FontMetrics fontMetrics;
  protected boolean closed;

  /**
   * Creates an empty canvas with given width and height.
   */
  public ProcessDiagramCanvas(int width, int height) {
    this.canvasWidth = width;
    this.canvasHeight = height;
    this.processDiagram = new BufferedImage(width, height, 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("Arial", Font.BOLD, 11);
    g.setFont(font);
    this.fontMetrics = g.getFontMetrics();
  }

  /**
   * Creates an empty canvas with given width and height.
   * 
   * Allows to specify minimal boundaries on the left and upper side of the
   * canvas. This is useful for diagrams that have white space there (eg
   * Signavio). Everything beneath these minimum values will be cropped.
   * 
   * @param minX
   *          Hint that will be used when generating the image. Parts that fall
   *          below minX on the horizontal scale will be cropped.
   * @param minY
   *          Hint that will be used when generating the image. Parts that fall
   *          below minX on the horizontal scale will be cropped.
   */
  public ProcessDiagramCanvas(int width, int height, int minX, int minY) {
    this(width, height);
    this.minX = minX;
    this.minY = minY;
  }

  /**
   * Generates an image of what currently is drawn on the canvas.
   * 
   * Throws an {@link ActivitiException} when {@link #close()} is already
   * called.
   */
  public InputStream generateImage(String imageType) {
    if (closed) {
      throw new ActivitiException("ProcessDiagramGenerator already closed");
    }

    ByteArrayOutputStream out = new ByteArrayOutputStream();
    try {
      // Try to remove white space
      minX = (minX <= 5) ? 5 : minX;
      minY = (minY <= 5) ? 5 : minY;
      BufferedImage imageToSerialize = processDiagram;
      if (minX >= 0 && minY >= 0) {
        imageToSerialize = processDiagram.getSubimage(minX - 5, minY - 5, canvasWidth - minX + 5, canvasHeight - minY + 5);
      }
      ImageIO.write(imageToSerialize, imageType, out);
    } catch (IOException e) {
      throw new ActivitiException("Error while generating process image", e);
    } finally {
      IoUtil.closeSilently(out);
    }
    return new ByteArrayInputStream(out.toByteArray());
  }

  /**
   * Closes the canvas which dissallows further drawing and releases graphical
   * resources.
   */
  public void close() {
    g.dispose();
    closed = true;
  }

  public void drawNoneStartEvent(int x, int y, int width, int height) {
    drawStartEvent(x, y, width, height, null);
  }

  public void drawTimerStartEvent(int x, int y, int width, int height) {
    drawStartEvent(x, y, width, height, TIMER_IMAGE);
  }

  public void drawStartEvent(int x, int y, int width, int height, Image image) {
    g.draw(new Ellipse2D.Double(x, y, width, height));
    if (image != null) {
      g.drawImage(image, x, y, width, height, null);
    }

  }

  public void drawNoneEndEvent(int x, int y, int width, int height) {
    Stroke originalStroke = g.getStroke();
    g.setStroke(END_EVENT_STROKE);
    g.draw(new Ellipse2D.Double(x, y, width, height));
    g.setStroke(originalStroke);
  }

  public void drawErrorEndEvent(int x, int y, int width, int height) {
    drawNoneEndEvent(x, y, width, height);
    g.drawImage(ERROR_THROW_IMAGE, x + 3, y + 3, width - 6, height - 6, null);
  }
  
  public void drawErrorStartEvent(int x, int y, int width, int height) {
    drawNoneStartEvent(x, y, width, height);
    g.drawImage(ERROR_CATCH_IMAGE, x + 3, y + 3, width - 6, height - 6, null);
  }

  public void drawCatchingEvent(int x, int y, int width, int height, Image image) {
    // event circles
    Ellipse2D outerCircle = new Ellipse2D.Double(x, y, width, height);
    int innerCircleX = x + 3;
    int innerCircleY = y + 3;
    int innerCircleWidth = width - 6;
    int innerCircleHeight = height - 6;
    Ellipse2D innerCircle = new Ellipse2D.Double(innerCircleX, innerCircleY, innerCircleWidth, innerCircleHeight);

    Paint originalPaint = g.getPaint();
    g.setPaint(BOUNDARY_EVENT_COLOR);
    g.fill(outerCircle);

    g.setPaint(originalPaint);
    g.draw(outerCircle);
    g.draw(innerCircle);

    g.drawImage(image, innerCircleX, innerCircleY, innerCircleWidth, innerCircleHeight, null);
  }

  public void drawCatchingTimerEvent(int x, int y, int width, int height) {
    drawCatchingEvent(x, y, width, height, TIMER_IMAGE);
  }

  public void drawCatchingErroEvent(int x, int y, int width, int height) {
    drawCatchingEvent(x, y, width, height, ERROR_CATCH_IMAGE);
  }
  
  public void drawCatchingSignalEvent(int x, int y, int width, int height) {
    drawCatchingEvent(x, y, width, height, SIGNAL_CATCH_IMAGE);
  }
  
  public void drawThrowingSignalEvent(int x, int y, int width, int height) {
    drawCatchingEvent(x, y, width, height, SIGNAL_THROW_IMAGE);
  }

  public void drawSequenceflow(int srcX, int srcY, int targetX, int targetY, boolean conditional) {
    Line2D.Double line = new Line2D.Double(srcX, srcY, targetX, targetY);
    g.draw(line);
    drawArrowHead(line);

    if (conditional) {
      drawConditionalSequenceFlowIndicator(line);
    }
  }

  public void drawSequenceflowWithoutArrow(int srcX, int srcY, int targetX, int targetY, boolean conditional) {
    Line2D.Double line = new Line2D.Double(srcX, srcY, targetX, targetY);
    g.draw(line);

    if (conditional) {
      drawConditionalSequenceFlowIndicator(line);
    }
  }

  public void drawArrowHead(Line2D.Double line) {
    int doubleArrowWidth = 2 * ARROW_WIDTH;
    Polygon arrowHead = new Polygon();
    arrowHead.addPoint(0, 0);
    arrowHead.addPoint(-ARROW_WIDTH, -doubleArrowWidth);
    arrowHead.addPoint(ARROW_WIDTH, -doubleArrowWidth);

    AffineTransform transformation = new AffineTransform();
    transformation.setToIdentity();
    double angle = Math.atan2(line.y2 - line.y1, line.x2 - line.x1);
    transformation.translate(line.x2, line.y2);
    transformation.rotate((angle - Math.PI / 2d));

    AffineTransform originalTransformation = g.getTransform();
    g.setTransform(transformation);
    g.fill(arrowHead);
    g.setTransform(originalTransformation);
  }

  public void drawConditionalSequenceFlowIndicator(Line2D.Double line) {
    int horizontal = (int) (CONDITIONAL_INDICATOR_WIDTH * 0.7);
    int halfOfHorizontal = horizontal / 2;
    int halfOfVertical = CONDITIONAL_INDICATOR_WIDTH / 2;

    Polygon conditionalIndicator = new Polygon();
    conditionalIndicator.addPoint(0, 0);
    conditionalIndicator.addPoint(-halfOfHorizontal, halfOfVertical);
    conditionalIndicator.addPoint(0, CONDITIONAL_INDICATOR_WIDTH);
    conditionalIndicator.addPoint(halfOfHorizontal, halfOfVertical);

    AffineTransform transformation = new AffineTransform();
    transformation.setToIdentity();
    double angle = Math.atan2(line.y2 - line.y1, line.x2 - line.x1);
    transformation.translate(line.x1, line.y1);
    transformation.rotate((angle - Math.PI / 2d));

    AffineTransform originalTransformation = g.getTransform();
    g.setTransform(transformation);
    g.draw(conditionalIndicator);

    Paint originalPaint = g.getPaint();
    g.setPaint(CONDITIONAL_INDICATOR_COLOR);
    g.fill(conditionalIndicator);

    g.setPaint(originalPaint);
    g.setTransform(originalTransformation);
  }

  public void drawTask(String name, int x, int y, int width, int height) {
    drawTask(name, x, y, width, height, false);
  }
  
  public void drawPoolOrLane(String name, int x, int y, int width, int height) {
    g.drawRect(x, y, width, height);
    
    // Add the name as text, vertical
    if(name != null && name.length() > 0) {
      // Include some padding
      int availableTextSpace = height - 6;

      // Create rotation for derived font
      AffineTransform transformation = new AffineTransform();
      transformation.setToIdentity();
      transformation.rotate(270 * Math.PI/180);

      Font currentFont = g.getFont();
      Font theDerivedFont = currentFont.deriveFont(transformation);
      g.setFont(theDerivedFont);
      
      String truncated = fitTextToWidth(name, availableTextSpace);
      int realWidth = fontMetrics.stringWidth(truncated);
      
      g.drawString(truncated, x + 2 + fontMetrics.getHeight(), 3 + y + availableTextSpace - (availableTextSpace - realWidth) / 2);
      g.setFont(currentFont);
    }
  }

  protected void drawTask(String name, int x, int y, int width, int height, boolean thickBorder) {
    Paint originalPaint = g.getPaint();
    g.setPaint(TASK_COLOR);

    // shape
    RoundRectangle2D rect = new RoundRectangle2D.Double(x, y, width, height, 20, 20);
    g.fill(rect);
    g.setPaint(originalPaint);

    if (thickBorder) {
      Stroke originalStroke = g.getStroke();
      g.setStroke(THICK_TASK_BORDER_STROKE);
      g.draw(rect);
      g.setStroke(originalStroke);
    } else {
      g.draw(rect);
    }

    // text
    if (name != null) {
      String text = fitTextToWidth(name, width);
      int textX = x + ((width - fontMetrics.stringWidth(text)) / 2);
      int textY = y + ((height - fontMetrics.getHeight()) / 2) + fontMetrics.getHeight();
      g.drawString(text, textX, textY);
    }
  }

  protected String fitTextToWidth(String original, int width) {
    String text = original;

    // remove length for "..."
    int maxWidth = width - 10;

    while (fontMetrics.stringWidth(text + "...") > maxWidth && text.length() > 0) {
      text = text.substring(0, text.length() - 1);
    }

    if (!text.equals(original)) {
      text = text + "...";
    }

    return text;
  }

  public void drawUserTask(String name, int x, int y, int width, int height) {
    drawTask(name, x, y, width, height);
    g.drawImage(USERTASK_IMAGE, x + 7, y + 7, ICON_SIZE, ICON_SIZE, null);
  }

  public void drawScriptTask(String name, int x, int y, int width, int height) {
    drawTask(name, x, y, width, height);
    g.drawImage(SCRIPTTASK_IMAGE, x + 7, y + 7, ICON_SIZE, ICON_SIZE, null);
  }

  public void drawServiceTask(String name, int x, int y, int width, int height) {
    drawTask(name, x, y, width, height);
    g.drawImage(SERVICETASK_IMAGE, x + 7, y + 7, ICON_SIZE, ICON_SIZE, null);
  }

  public void drawReceiveTask(String name, int x, int y, int width, int height) {
    drawTask(name, x, y, width, height);
    g.drawImage(RECEIVETASK_IMAGE, x + 7, y + 7, ICON_SIZE, ICON_SIZE, null);
  }

  public void drawSendTask(String name, int x, int y, int width, int height) {
    drawTask(name, x, y, width, height);
    g.drawImage(SENDTASK_IMAGE, x + 7, y + 7, ICON_SIZE, ICON_SIZE, null);
  }

  public void drawManualTask(String name, int x, int y, int width, int height) {
    drawTask(name, x, y, width, height);
    g.drawImage(MANUALTASK_IMAGE, x + 7, y + 7, ICON_SIZE, ICON_SIZE, null);
  }
  
  public void drawBusinessRuleTask(String name, int x, int y, int width, int height) {
    drawTask(name, x, y, width, height);
    g.drawImage(BUSINESS_RULE_TASK_IMAGE, x + 7, y + 7, ICON_SIZE, ICON_SIZE, null);
  }

  public void drawExpandedSubProcess(String name, int x, int y, int width, int height, Boolean isTriggeredByEvent) {
    RoundRectangle2D rect = new RoundRectangle2D.Double(x, y, width, height, 20, 20);
    
    // Use different stroke (dashed)
    if(isTriggeredByEvent) {
      Stroke originalStroke = g.getStroke();
      g.setStroke(EVENT_SUBPROCESS_STROKE);
      g.draw(rect);
      g.setStroke(originalStroke);
    } else {
      g.draw(rect);
    }

    String text = fitTextToWidth(name, width);
    g.drawString(text, x + 10, y + 15);
  }

  public void drawCollapsedSubProcess(String name, int x, int y, int width, int height, Boolean isTriggeredByEvent) {
    drawCollapsedTask(name, x, y, width, height, false);
  }

  public void drawCollapsedCallActivity(String name, int x, int y, int width, int height) {
    drawCollapsedTask(name, x, y, width, height, true);
  }

  protected void drawCollapsedTask(String name, int x, int y, int width, int height, boolean thickBorder) {
    // The collapsed marker is now visualized separately
    drawTask(name, x, y, width, height, thickBorder);
  }

  public void drawCollapsedMarker(int x, int y, int width, int height) {
    // rectangle
    int rectangleWidth = MARKER_WIDTH;
    int rectangleHeight = MARKER_WIDTH;
    Rectangle rect = new Rectangle(x + (width - rectangleWidth) / 2, y + height - rectangleHeight - 3, rectangleWidth, rectangleHeight);
    g.draw(rect);

    // plus inside rectangle
    Line2D.Double line = new Line2D.Double(rect.getCenterX(), rect.getY() + 2, rect.getCenterX(), rect.getMaxY() - 2);
    g.draw(line);
    line = new Line2D.Double(rect.getMinX() + 2, rect.getCenterY(), rect.getMaxX() - 2, rect.getCenterY());
    g.draw(line);
  }

  public void drawActivityMarkers(int x, int y, int width, int height, boolean multiInstanceSequential, boolean multiInstanceParallel, boolean collapsed) {
    if (collapsed) {
      if (!multiInstanceSequential && !multiInstanceParallel) {
        drawCollapsedMarker(x, y, width, height);
      } else {
        drawCollapsedMarker(x - MARKER_WIDTH / 2 - 2, y, width, height);
        if (multiInstanceSequential) {
          drawMultiInstanceMarker(true, x + MARKER_WIDTH / 2 + 2, y, width, height);
        } else if (multiInstanceParallel) {
          drawMultiInstanceMarker(false, x + MARKER_WIDTH / 2 + 2, y, width, height);
        }
      }
    } else {
      if (multiInstanceSequential) {
        drawMultiInstanceMarker(false, x, y, width, height);
      } else if (multiInstanceParallel) {
        drawMultiInstanceMarker(true, x, y, width, height);
      }
    }
  }

  public void drawGateway(int x, int y, int width, int height) {
    Polygon rhombus = new Polygon();
    rhombus.addPoint(x, y + (height / 2));
    rhombus.addPoint(x + (width / 2), y + height);
    rhombus.addPoint(x + width, y + (height / 2));
    rhombus.addPoint(x + (width / 2), y);
    g.draw(rhombus);
  }

  public void drawParallelGateway(int x, int y, int width, int height) {
    // rhombus
    drawGateway(x, y, width, height);

    // plus inside rhombus
    Stroke orginalStroke = g.getStroke();
    g.setStroke(GATEWAY_TYPE_STROKE);
    Line2D.Double line = new Line2D.Double(x + 10, y + height / 2, x + width - 10, y + height / 2); // horizontal
    g.draw(line);
    line = new Line2D.Double(x + width / 2, y + height - 10, x + width / 2, y + 10); // vertical
    g.draw(line);
    g.setStroke(orginalStroke);
  }

  public void drawExclusiveGateway(int x, int y, int width, int height) {
    // rhombus
    drawGateway(x, y, width, height);

    int quarterWidth = width / 4;
    int quarterHeight = height / 4;

    // X inside rhombus
    Stroke orginalStroke = g.getStroke();
    g.setStroke(GATEWAY_TYPE_STROKE);
    Line2D.Double line = new Line2D.Double(x + quarterWidth + 3, y + quarterHeight + 3, x + 3 * quarterWidth - 3, y + 3 * quarterHeight - 3);
    g.draw(line);
    line = new Line2D.Double(x + quarterWidth + 3, y + 3 * quarterHeight - 3, x + 3 * quarterWidth - 3, y + quarterHeight + 3);
    g.draw(line);

    g.setStroke(orginalStroke);
  }

  public void drawInclusiveGateway(int x, int y, int width, int height) {
    // rhombus
    drawGateway(x, y, width, height);

    int diameter = width / 2;

    // circle inside rhombus
    Stroke orginalStroke = g.getStroke();
    g.setStroke(GATEWAY_TYPE_STROKE);
    Ellipse2D.Double circle = new Ellipse2D.Double(((width - diameter) / 2) + x, ((height - diameter) / 2) + y, diameter, diameter);
    g.draw(circle);
    g.setStroke(orginalStroke);
  }

  public void drawMultiInstanceMarker(boolean sequential, int x, int y, int width, int height) {
    int rectangleWidth = MARKER_WIDTH;
    int rectangleHeight = MARKER_WIDTH;
    int lineX = x + (width - rectangleWidth) / 2;
    int lineY = y + height - rectangleHeight - 3;

    Stroke orginalStroke = g.getStroke();
    g.setStroke(MULTI_INSTANCE_STROKE);

    if (sequential) {
      g.draw(new Line2D.Double(lineX, lineY, lineX + rectangleWidth, lineY));
      g.draw(new Line2D.Double(lineX, lineY + rectangleHeight / 2, lineX + rectangleWidth, lineY + rectangleHeight / 2));
      g.draw(new Line2D.Double(lineX, lineY + rectangleHeight, lineX + rectangleWidth, lineY + rectangleHeight));
    } else {
      g.draw(new Line2D.Double(lineX, lineY, lineX, lineY + rectangleHeight));
      g.draw(new Line2D.Double(lineX + rectangleWidth / 2, lineY, lineX + rectangleWidth / 2, lineY + rectangleHeight));
      g.draw(new Line2D.Double(lineX + rectangleWidth, lineY, lineX + rectangleWidth, lineY + rectangleHeight));
    }

    g.setStroke(orginalStroke);
  }

  public void drawHighLight(int x, int y, int width, int height) {
    Paint originalPaint = g.getPaint();
    Stroke originalStroke = g.getStroke();

    g.setPaint(HIGHLIGHT_COLOR);
    g.setStroke(THICK_TASK_BORDER_STROKE);

    RoundRectangle2D rect = new RoundRectangle2D.Double(x, y, width, height, 20, 20);
    g.draw(rect);

    g.setPaint(originalPaint);
    g.setStroke(originalStroke);
  }

}