Sadece Çizgi Çizen Çizim Programı

  1 package com.godoro.drawer;
  2 import javax.swing.*;
  3 import java.awt.*;
  4 public class DrawApp extends JFrame{
  5   DrawApp(){
  6     setBounds(10,10,300,300);
  7     DrawCanvas canvas=new DrawCanvas();
  8     getContentPane().setLayout(new BorderLayout());
  9     getContentPane().add(canvas,BorderLayout.CENTER);
 10     setVisible(true);
 11   }
 12   public static void main(String[] args) {
 13     new DrawApp();
 14   }
 15 }

  1 package com.godoro.drawer;
  2 import java.awt.*;
  3 import java.awt.event.*;
  4 import java.util.*;
  5 /**
  6  * Çizimin yapıldığı class
  7  * Tüm çizgileri lines vector'unde tutar.
  8  * CanvasMouseAdapter ve CanvasMouseMotionAdapter ile fare olaylarını tutar.
  9  * pressedX,pressedY en son basılan noktayı tutar.
 10  * drawingLine ise şu anda çizim yapılan line'ı tutar. drag edildiği sürece boyu değiştirilir.
 11  */
 12 public class DrawCanvas extends Canvas{
 13   private Vector lines=new Vector();
 14   private int pressedX,pressedY;
 15   private Line drawingLine=null;
 16   public DrawCanvas(){
 17     setBackground(Color.WHITE);
 18     addMouseListener(new CanvasMouseAdapter());
 19     addMouseMotionListener(new CanvasMouseMotionAdapter());
 20   }
 21   public void paint(Graphics g){
 22     for(int i=0;i<lines.size();i++){
 23       Line line=(Line)lines.get(i);
 24       line.draw(g);
 25     }
 26   }
 27   class CanvasMouseAdapter extends MouseAdapter{
 28     public void mousePressed(MouseEvent e){
 29       pressedX=e.getX();
 30       pressedY=e.getY();
 31     }
 32     public void mouseReleased(MouseEvent e){
 33       drawingLine=null;
 34     }
 35   }
 36   class CanvasMouseMotionAdapter extends MouseMotionAdapter{
 37     public void mouseDragged(MouseEvent e){
 38       int x=e.getX();
 39       int y=e.getY();
 40       if(drawingLine==null){
 41         drawingLine=new Line(pressedX,pressedY,x,y);
 42         lines.add(drawingLine);
 43       }else{
 44         drawingLine.change(x,y);
 45       }
 46       repaint();
 47     }
 48   }
 49 }

  1 package com.godoro.drawer;
  2 import java.awt.*;
  3 /**
  4  * Bir başlangıç ve bir bitiş noktasını tutan class.
  5  * change method ile ikinci nokta değiştirilebiliyor.
  6  * draw method'u ile verilen bir Graphics method'una kendisini çizebiliyor.
  7  */
  8 public class Line {
  9   private Point p1,p2;
 10   public Line(int x1,int y1,int x2,int y2){
 11     this(new Point(x1,y1),new Point(x2,y2));
 12   }
 13   public Line(Point p1,Point p2){
 14     this.p1=p1;
 15     this.p2=p2;
 16   }
 17   public int getX1(){
 18     return (int)p1.getX();
 19   }
 20   public int getY1(){
 21     return (int)p1.getY();
 22   }
 23   public int getX2(){
 24     return (int)p2.getX();
 25   }
 26   public int getY2(){
 27     return (int)p2.getY();
 28   }
 29   public void change(int x2,int y2){
 30     p2.move(x2,y2);
 31   }
 32   public void draw(Graphics g){
 33     g.drawLine(getX1(),getY1(),getX2(),getY2());
 34   }
 35 }