시소당

consume 사용 그림판 애플릿 소스

import  java.awt.event.*;
import  java.awt.*;
import  java.applet.*;

import  java.util.Vector;

public  class  DrawTest  extends  Applet{
        DrawPanel  panel;
        DrawControls  controls;

        public  void  init()  {
  setLayout(new  BorderLayout());
  panel  =  new  DrawPanel();
                controls  =  new  DrawControls(panel);
  add("Center",  panel);
  add("South",controls);
        }

        public  void  destroy()  {
                remove(panel);
                remove(controls);
        }

        public  static  void  main(String  args[])  {
  Frame  f  =  new  Frame("DrawTest");
  DrawTest  drawTest  =  new  DrawTest();
  drawTest.init();
  drawTest.start();

  f.add("Center",  drawTest);
  f.setSize(300,  300);
  f.show();
        }
        public  String  getAppletInfo()  {
                return  "A  simple  drawing  program.";
        }
}

class  DrawPanel  extends  Panel  implements  MouseListener,  MouseMotionListener  {
        public  static  final  int  LINES  =  0;
        public  static  final  int  POINTS  =  1;
        int        mode  =  LINES;
        Vector  lines  =  new  Vector();
        Vector  colors  =  new  Vector();
        int  x1,y1;
        int  x2,y2;

        public  DrawPanel()  {
  setBackground(Color.white);
  addMouseMotionListener(this);
  addMouseListener(this);
        }

        public  void  setDrawMode(int  mode)  {
  switch  (mode)  {
      case  LINES:
      case  POINTS:
          this.mode  =  mode;
          break;
      default:
          throw  new  IllegalArgumentException();
  }
        }


        public  void  mouseDragged(MouseEvent  e)  {
                e.consume();
                switch  (mode)  {
                        case  LINES:
                                x2  =  e.getX();
                                y2  =  e.getY();
                                break;
                        case  POINTS:
                        default:
                                colors.addElement(getForeground());
                                lines.addElement(new  Rectangle(x1,  y1,  e.getX(),  e.getY()));
                                x1  =  e.getX();
                                y1  =  e.getY();
                                break;
                }
                repaint();
        }

        public  void  mouseMoved(MouseEvent  e)  {
        }

        public  void  mousePressed(MouseEvent  e)  {
                e.consume();
                switch  (mode)  {
                        case  LINES:
                                x1  =  e.getX();
                                y1  =  e.getY();
                                x2  =  -1;
                                break;
                        case  POINTS:
                        default:
                                colors.addElement(getForeground());
                                lines.addElement(new  Rectangle(e.getX(),  e.getY(),  -1,  -1));
                                x1  =  e.getX();
                                y1  =  e.getY();
                                repaint();
                                break;
                }
        }

        public  void  mouseReleased(MouseEvent  e)  {
                e.consume();
                switch  (mode)  {
                        case  LINES:
                                colors.addElement(getForeground());
                                lines.addElement(new  Rectangle(x1,  y1,  e.getX(),  e.getY()));
                                x2  =  -1;
                                break;
                        case  POINTS:
                        default:
                                break;
                }
                repaint();
        }

        public  void  mouseEntered(MouseEvent  e)  {
        }

        public  void  mouseExited(MouseEvent  e)  {
        }

        public  void  mouseClicked(MouseEvent  e)  {
        }

        public  void  paint(Graphics  g)  {
  int  np  =  lines.size();

  /*  draw  the  current  lines  */
  g.setColor(getForeground());
  for  (int  i=0;  i  <  np;  i++)  {
          Rectangle  p  =  (Rectangle)lines.elementAt(i);
          g.setColor((Color)colors.elementAt(i));
          if  (p.width  !=  -1)  {
    g.drawLine(p.x,  p.y,  p.width,  p.height);
          }  else  {
    g.drawLine(p.x,  p.y,  p.x,  p.y);
          }
  }
  if  (mode  ==  LINES)  {
          g.setColor(getForeground());
          if  (x2  !=  -1)  {
                                g.drawLine(x1,  y1,  x2,  y2);
          }
  }
        }
}


class  DrawControls  extends  Panel  implements  ItemListener  {
        DrawPanel  target;

        public  DrawControls(DrawPanel  target)  {
  this.target  =  target;
  setLayout(new  FlowLayout());
  setBackground(Color.lightGray);
  target.setForeground(Color.red);
  CheckboxGroup  group  =  new  CheckboxGroup();
  Checkbox  b;
  add(b  =  new  Checkbox(null,  group,  false));
  b.addItemListener(this);
  b.setForeground(Color.red);
  add(b  =  new  Checkbox(null,  group,  false));
  b.addItemListener(this);
  b.setForeground(Color.green);
  add(b  =  new  Checkbox(null,  group,  false));
  b.addItemListener(this);
  b.setForeground(Color.blue);
  add(b  =  new  Checkbox(null,  group,  false));
  b.addItemListener(this);
  b.setForeground(Color.pink);
  add(b  =  new  Checkbox(null,  group,  false));
  b.addItemListener(this);
  b.setForeground(Color.orange);
  add(b  =  new  Checkbox(null,  group,  true));
  b.addItemListener(this);
  b.setForeground(Color.black);
  target.setForeground(b.getForeground());
  Choice  shapes  =  new  Choice();
  shapes.addItemListener(this);
  shapes.addItem("Lines");
  shapes.addItem("Points");
  shapes.setBackground(Color.lightGray);
  add(shapes);
        }

        public  void  paint(Graphics  g)  {
  Rectangle  r  =  getBounds();
  g.setColor(Color.lightGray);
  g.draw3DRect(0,  0,  r.width,  r.height,  false);

                int  n  =  getComponentCount();
                for(int  i=0;  i<n;  i++)  {
                        Component  comp  =  getComponent(i);
                        if  (comp  instanceof  Checkbox)  {
                                Point  loc  =  comp.getLocation();
                                Dimension  d  =  comp.getSize();
                                g.setColor(comp.getForeground());
                                g.drawRect(loc.x-1,  loc.y-1,  d.width+1,  d.height+1);
                        }
                }
        }

    public  void  itemStateChanged(ItemEvent  e)  {
        if  (e.getSource()  instanceof  Checkbox)  {
            target.setForeground(((Component)e.getSource()).getForeground());
        }  else  if  (e.getSource()  instanceof  Choice)  {
            String  choice  =  (String)  e.getItem();
            if  (choice.equals("Lines"))  {
  target.setDrawMode(DrawPanel.LINES);
            }  else  if  (choice.equals("Points"))  {
  target.setDrawMode(DrawPanel.POINTS);
            }
        }
    }
}