linebean.java~335~

flowGUI简单的java图形设计

package com.wiziflow.gui;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
/**
 * 画线控件。给定起点和终点，画一条直线。
 * 只有当鼠标移出控件时，才开始画线。
 * 如果整个JComponent加监听，则太大；加一个小小的JLabel，增加监听机制，
 * 很好的解决了line的监听问题
 *
 */

public class LineBean extends JComponent {
  private Bean startBean = null;//线起点的Bean，跟前面的startBean不同
  private Bean endBean = null;//线终点的Bean，跟前面的endBean不同
  //如果还没有endBean，画线依据终点
  private int newX=0;
  private int newY=0;
  private Stroke stroke = new BasicStroke(1f);
  private JLabel label = new JLabel("流");
  private boolean labelDragging=false;//是否在拖拉
  private int labelPressX=0;//鼠标点击在label上的X坐标
  private int labelPressY=0;//鼠标点击在label上的Y坐标

  public LineBean() {
    jbInit();
    //只有设置了尺寸，才能刷新，调用paint(Graphics g)方法
    //this.setSize(1000,1000);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    this.setSize(d);
    //以后屏幕能滚动时，仅仅屏幕大小仍然不够。
  }

  //设置起点控件
  public void setStartComponent(Bean b) {
    startBean = b;
  }
  //设置终点控件
  public void setEndComponent(Bean b) {
    endBean = b;
  }

  public void remove() {
    JLayeredPane flowPane = (JLayeredPane)getParent();
    flowPane.remove(this);
    flowPane.repaint();
  }

  private void jbInit()  {
    label.setSize(20,20);
    label.setFont(new Font("宋体",0,14));
    //label.setBorder(BorderFactory.createLineBorder(Color.red));
    label.setVisible(false);
    //居中处理
    label.setHorizontalAlignment(JLabel.CENTER);
    label.setVerticalAlignment(JLabel.CENTER);
    //流字加鼠标监听
    label.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        label_mouseClicked(e);
      }
      public void mousePressed(MouseEvent e) {
        label_mousePressed(e);
      }
      public void mouseReleased(MouseEvent e) {
        labelDragging=false;
      }
    });
    this.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
      public void propertyChange(PropertyChangeEvent e) {
        this_propertyChange(e);
      }
    });
    label.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
      public void mouseDragged(MouseEvent e) {
        label_mouseDragged(e);
      }
    });
    this.add(label);
    //this.setBorder(BorderFactory.createLineBorder(Color.black));
  }

  void this_propertyChange(PropertyChangeEvent e) {
    //新的坐标点
    String name = e.getPropertyName();
    if("x".equals(name)) {
      newX = Integer.parseInt(e.getNewValue().toString());
      newY = Integer.parseInt(e.getOldValue().toString());
      //这一段将来还是要的
//      if(endBean==null) {
//        this.setSize(newX,newY);
//      }else{
//        this.setSize(Math.abs(endBean.getX()-startBean.getX())*2,Math.abs(endBean.getY()-startBean.getY())*2);
//      }
    }
    this.repaint();

  }
  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D)g;
//    //想办法让线段光滑
//    RenderingHints hints = new RenderingHints(
//              RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
//    hints.put(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_OFF);
//    hints.put(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
//    //---------------
//    g2.setRenderingHints(hints);
//    g2.setStroke(stroke);
    g2.setStroke(new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND));
    if(endBean!=null) {
      newX = endBean.getX()-startBean.getX();
      newY = endBean.getY()-startBean.getY();
    }
//    this.setLocation(startBean.getX(),startBean.getY());
//    this.setSize(newX-startBean.getX() ,newY-startBean.getY());

    if(startBean!=null && newX!=0) {
      Point [] p = null;
      if(endBean==null) {//图标和鼠标之间
        Point mousePoint = new Point(startBean.getX()+newX,startBean.getY()+newY);
        p = Tools.getClosestPoint(startBean,mousePoint);
      }else{//图标和图标之间
        p = Tools.getClosestPoint(startBean,endBean);
      }
      //开始画线和“流”字
      if(p!=null) {
        //线段中点的坐标
        int lineCenterX = p[0].x+(p[1].x-p[0].x)/2;
        int lineCenterY = p[0].y+(p[1].y-p[0].y)/2;
        Point labelPoint= new Point(lineCenterX,lineCenterY);
        //label.setLocation(/2,startBean.getY()+newY/2);
        if(!labelDragging) {
        label.setLocation(labelPoint);
        label.setVisible(true);
        }
        ////画线。先画开始图标到“流”字，然后从“流”字到结束图标
        //g2.drawLine((int)p[0].getX(),(int)p[0].getY(),(int)p[1].getX(),(int)p[1].getY());
        Point [] one = Tools.getClosestPoint(label,p[0]);
        g2.drawLine(one[0].x,one[0].y,one[1].x,one[1].y);
        Point [] two = Tools.getClosestPoint(label,p[1]);
        g2.drawLine(two[0].x,two[0].y,two[1].x,two[1].y);
      }
    }
    super.paint(g);
  }

  void label_mouseClicked(MouseEvent e) {
    JLayeredPane flowPane = (JLayeredPane)getParent();
    flowPane.moveToFront(label);
    label.requestFocus();
    System.out.println("流label click");
  }

  void label_mouseDragged(MouseEvent e) {
    labelDragging=true;
    label.setLocation(label.getX()+(e.getX()-labelPressX),label.getY()+(e.getY()-labelPressY));
    this.repaint();
  }

  void label_mousePressed(MouseEvent e) {
   labelPressX=e.getX();
   labelPressY=e.getY();

  }
}