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paintComponent, ïîìîãèòå ðàçîáðàòñÿ

- ß íå ìîãó ðàçîáðàòüñÿ ñ îäíèì ìåòîäîì â ïðîãðàììå êîòîðàÿ ðèñóåò ôèãóðû(òèïà Paint òîëüêî óæàñíî ïðîñòîé). ß íå ìîãó ïîíÿòü ÷òî âûçûâàåò ìåòîä paintComponent(Graphics g) à èìåííî îí ðèñóåò ôèãóðû. Ìíå ýòî íàäî äëÿ òîãî ÷òîá íàñòðîèòü OpenCanvasFile(). Ïî÷åìó òî îâàë è ïðÿìîóãîëüíèê ÿ íå ìîãó âîññîçäàòü èç ôàéëà õîòÿ ëèíèè áåç ïðîáëåì îòêðûâàþòñÿ.Êîä import java.awt.*;import java.awt.event.*;import java.util.Vector;import java.util.StringTokenizer;import java.io.*;import javax.swing.*;public class CanvasPanel extends JPanel implements MouseListener,MouseMotionListener, Serializable{  protected final static int LINE=1,SQUARE=2,OVAL=3, SOLID_SQUARE=22, SOLID_OVAL=33;  protected static Vector vLine,vSquare,vOval,vSolidSquare,vSolidOval;  private LinkedList undo, redo;  private Color foreGroundColor, backGroundColor;  private int x1,y1,x2,y2,drawMode=0;  private boolean solidMode;  public CanvasPanel()  {    vLine = new Vector();    vSquare = new Vector();    vOval = new Vector();    vSolidSquare = new Vector();    vSolidOval = new Vector();    addMouseListener(this);    addMouseMotionListener(this);    solidMode = false;    foreGroundColor = Color.WHITE;    backGroundColor = Color.BLACK;    setBackground(backGroundColor);    undo = new LinkedList();    redo = new LinkedList();    repaint();  }/*----------------------------------------------------------------------------*/  public void mousePressed(MouseEvent event)  {  x1 = event.getX();  y1 = event.getY();  }/*----------------------------------------------------------------------------*/  public void mouseClicked(MouseEvent event){}  public void mouseMoved(MouseEvent event){}/*----------------------------------------------------------------------------*/  public void mouseReleased(MouseEvent event)  {    if (drawMode == LINE)    {      vLine.add(new Coordinate(x1,y1,event.getX(),event.getY(),foreGroundColor));      undo.addFirst(new StepInfo(LINE ,new Coordinate(x1,y1,event.getX(),event.getY(),foreGroundColor)));    }    if (drawMode == SQUARE)    {      if(solidMode)      {        if(x1 > event.getX() || y1 > event.getY())    {          vSolidSquare.add(new Coordinate(event.getX(),event.getY(),x1,y1,foreGroundColor));          undo.addFirst(new StepInfo(SOLID_SQUARE, new Coordinate(event.getX(),event.getY(),x1,y1,foreGroundColor)));        } else {          vSolidSquare.add(new Coordinate(x1,y1,event.getX(),event.getY(),foreGroundColor));          undo.addFirst(new StepInfo(SOLID_SQUARE, new Coordinate(x1,y1,event.getX(),event.getY(),foreGroundColor)));        }      } else {        if(x1 > event.getX() || y1 > event.getY())        {          vSquare.add(new Coordinate(event.getX(),event.getY(),x1,y1,foreGroundColor));          undo.addFirst(new StepInfo(SQUARE, new Coordinate(event.getX(),event.getY(),x1,y1,foreGroundColor)));        } else {          vSquare.add(new Coordinate(x1,y1,event.getX(),event.getY(),foreGroundColor));          undo.addFirst(new StepInfo(SQUARE, new Coordinate(x1,y1,event.getX(),event.getY(),foreGroundColor)));        }      }    }    if (drawMode == this.OVAL)    {      if(solidMode)      {        if(x1 > event.getX() || y1 > event.getY())        {          vSolidOval.add(new Coordinate(event.getX(),event.getY(),x1,y1,foreGroundColor));          undo.addFirst(new StepInfo(SOLID_OVAL, new Coordinate(event.getX(),event.getY(),x1,y1,foreGroundColor)));        } else {          vSolidOval.add(new Coordinate(x1,y1,event.getX(),event.getY(),foreGroundColor));          undo.addFirst(new StepInfo(SOLID_OVAL, new Coordinate(x1,y1,event.getX(),event.getY(),foreGroundColor)));        }      } else {        if(x1 > event.getX() || y1 > event.getY())        {          vOval.add(new Coordinate(event.getX(),event.getY(),x1,y1,foreGroundColor));          undo.addFirst(new StepInfo(OVAL, new Coordinate(event.getX(),event.getY(),x1,y1,foreGroundColor)));        } else {          vOval.add(new Coordinate(x1,y1,event.getX(),event.getY(),foreGroundColor));          undo.addFirst(new StepInfo(OVAL, new Coordinate(x1,y1,event.getX(),event.getY(),foreGroundColor)));        }      }    }    x1=x2=0;    y1=y2=0;  }/*----------------------------------------------------------------------------*/  public void mouseEntered(MouseEvent event)  {    setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));  }/*----------------------------------------------------------------------------*/  public void mouseExited(MouseEvent event)  {    setCursor(new Cursor(Cursor.DEFAULT_CURSOR));  }/*----------------------------------------------------------------------------*/  public void mouseDragged(MouseEvent event)  {    x2 = event.getX();    y2 = event.getY();    repaint();  }/*----------------------------------------------------------------------------*/  public void paintComponent(Graphics g)  {    super.paintComponent(g);    redrawVectorBuffer(g);    g.setColor(foreGroundColor);    if (drawMode == LINE)    {      g.drawLine(x1,y1,x2,y2);    }    if (drawMode == OVAL)    {      if(solidMode)      {        if(x1 > x2 || y1 > y2)        {          g.fillOval(x2,y2,x1-x2,y1-y2);        } else {          g.fillOval(x1,y1,x2-x1,y2-y1);        }      } else {        if(x1 > x2 || y1 > y2)        {          g.drawOval (x2,y2,x1-x2,y1-y2);        } else {          g.drawOval(x1, y1, x2 - x1, y2 - y1);        }      }    }    if (drawMode == SQUARE)    {      if(solidMode)      {        if(x1 > x2 || y1 > y2)        {          g.fillRect (x2,y2,x1-x2,y1-y2);        } else {          g.fillRect(x1, y1, x2 - x1, y2 - y1);        }      } else {        if(x1 > x2 || y1 > y2)        {          g.drawRect (x2,y2,x1-x2,y1-y2);        } else {          g.drawRect(x1, y1, x2 - x1, y2 - y1);        }      }    }  }/*----------------------------------------------------------------------------*/  public void setDrawMode(int mode)  {    drawMode = mode;  }  public int getDrawMode()  {    return drawMode;  }/*----------------------------------------------------------------------------*/  public void setSolidMode(Boolean inSolidMode)  {    solidMode = inSolidMode.booleanValue();  }  public Boolean getSolidMode()  {    return Boolean.valueOf(solidMode);  }/*----------------------------------------------------------------------------*/  public void setForeGroundColor(Color inputColor)  {    foreGroundColor = inputColor;  }  public Color getForeGroundColor()  {    return foreGroundColor;  }/*----------------------------------------------------------------------------*/  public void setBackGroundColor(Color inputColor)  {    backGroundColor = inputColor;    this.setBackground(backGroundColor);  }  public Color getBackGroundColor()  {    return backGroundColor;  }/*----------------------------------------------------------------------------*/  public void undo()  {    StepInfo tempInfo;    if(undo.isEmpty())    {      JOptionPane.showMessageDialog(null, "Can't Undo","Painter", JOptionPane.INFORMATION_MESSAGE);    } else {      tempInfo = (StepInfo)undo.removeFirst();      switch(tempInfo.getStepType())      {        case 1:    vLine.remove(vLine.size()-1);                break;        case 2:    vSquare.remove(vSquare.size()-1);        break;        case 3:    vOval.remove(vOval.size()-1);        break;        case 22: vSolidSquare.remove(vSolidSquare.size()-1);                 break;        case 33: vSolidOval.remove(vSolidOval.size()-1);                 break;      }      redo.addFirst(tempInfo);    }    repaint();  }/*----------------------------------------------------------------------------*/  public void redo()  {    StepInfo tempInfo;    if(redo.isEmpty())    {      JOptionPane.showMessageDialog(null,"Can't Redo","Painter",JOptionPane.INFORMATION_MESSAGE);    } else {      tempInfo = (StepInfo)redo.removeFirst();      switch(tempInfo.getStepType())      {        case 1:    vLine.add(tempInfo.getStepCoordinate());        break;        case 2:    vSquare.add(tempInfo.getStepCoordinate());        break;        case 3:    vOval.add(tempInfo.getStepCoordinate());        break;        case 22:vSolidSquare.add(tempInfo.getStepCoordinate());        break;        case 33:vSolidOval.add(tempInfo.getStepCoordinate());        break;      }      undo.addFirst(tempInfo);    }    repaint();  }/*----------------------------------------------------------------------------*/  public void clearCanvas()  {    vLine.removeAllElements();    vOval.removeAllElements();    vSolidOval.removeAllElements();    vSolidSquare.removeAllElements();    vSquare.removeAllElements();    undo.clear();    redo.clear();    repaint();  }/*----------------------------------------------------------------------------*/  public void SaveCanvasToFile()  {    try {      JFileChooser chooser = new JFileChooser();      if (chooser.showDialog(null, "Save") == JFileChooser.APPROVE_OPTION)      {        String filename = chooser.getSelectedFile().getPath();        BufferedWriter out = new BufferedWriter(new FileWriter(filename));        for (int i = 0; i < vLine.size(); i++)        {          Coordinate temp = (Coordinate) vLine.get(i);          out.write("Line " + temp.getX1() + " " + temp.getY1() + " " +temp.getX2()+ " " + temp.getY2());          out.newLine();        }        for (int i = 0; i < vOval.size(); i++) {          Coordinate temp = (Coordinate) vLine.get(i);          out.write("Oval " + temp.getX1() + " " + temp.getY1() + " " +temp.getX2()+ " " + temp.getY2());          out.newLine();        }        for (int i = 0; i < vSolidOval.size(); i++) {          Coordinate temp = (Coordinate) vLine.get(i);          out.write("SolidOval " + temp.getX1() + " " + temp.getY1() + " " +temp.getX2()+ " " + temp.getY2());          out.newLine();        }        for (int i = 0; i < vSquare.size(); i++) {          Coordinate temp = (Coordinate) vLine.get(i);          out.write("Square " + temp.getX1() + " " + temp.getY1() + " " +temp.getX2()+ " " + temp.getY2());          out.newLine();        }        for (int i = 0; i < vSolidSquare.size(); i++) {          Coordinate temp = (Coordinate) vLine.get(i);          out.write("SolidSquare " + temp.getX1() + " " + temp.getY1() + " " +temp.getX2()+ " " + temp.getY2());          out.newLine();        }        out.flush();        out.close();      }    } catch (IOException e) {      JOptionPane.showMessageDialog(null,"Error saving file");    }  }  public void OpenCanvasFile()  {    try {      JFileChooser chooser = new JFileChooser();      if (chooser.showDialog(null, "Load") == JFileChooser.APPROVE_OPTION)      {        String filename = chooser.getSelectedFile().getPath();        BufferedReader reader = new BufferedReader(new FileReader(filename));        String input = reader.readLine();        StringTokenizer str;        while (input != null)        {          str = new StringTokenizer(input);          String shape = str.nextToken();          int x1,y1,x2,y2;          x1 = Integer.parseInt(str.nextToken());          y1 = Integer.parseInt(str.nextToken());          x2 = Integer.parseInt(str.nextToken());          y2 = Integer.parseInt(str.nextToken());          if(shape.equals("Line"))          {            vLine.add(new Coordinate(x1,y1,x2,y2,foreGroundColor));          }          if(shape.equals("Oval"))          {            if(x1 > x2 || y1 > y2)            {              vOval.add(new Coordinate(x2,y2,x1,y1,foreGroundColor));            } else {              vOval.add(new Coordinate(x1,y1,x2,y2,foreGroundColor));            }          }          if(shape.equals("SolidOval"))          {            if(x1 > x2 || y1 > y2)            {              vSolidOval.add(new Coordinate(x2,y2,x1,y1,foreGroundColor));            } else {              vSolidOval.add(new Coordinate(x1,y1,x2,y2,foreGroundColor));            }          }          if(shape.equals("Square"))          {            if(x1 > x2 || y1 > x2)            {              vSquare.add(new Coordinate(x2,y2,x1,y1,foreGroundColor));            } else {              vSquare.add(new Coordinate(x1,y1,x2,y2,foreGroundColor));            }          }          if(shape.equals("SolidSquare"))          {            if(x1 > x2 || y1 > y2)            {              vSolidSquare.add(new Coordinate(x2,y2,x1,y1,foreGroundColor));            } else {              vSolidSquare.add(new Coordinate(x1,y1,x2,y2,foreGroundColor));            }          }          input = reader.readLine();        }        reader.close();      }    } catch (Exception e) {      JOptionPane.showMessageDialog(null,"Can't open file","Painter",JOptionPane.INFORMATION_MESSAGE);    }  }/*----------------------------------------------------------------------------*/  private class Coordinate implements Serializable  {    private int x1,y1,x2,y2;    private Color foreColor;    public Coordinate (int inx1,int iny1,int inx2, int iny2, Color color)    {      x1 = inx1;      y1 = iny1;      x2 = inx2;      y2 = iny2;      foreColor = color;    }    public Color colour()    {      return foreColor;    }    public int getX1 ()    {      return x1;    }    public int getX2 ()    {      return x2;    }    public int getY1 ()    {      return y1;    }    public int getY2 ()    {      return y2;    }  }/*----------------------------------------------------------------------------*/  private class StepInfo implements Serializable  {    private int stepType;    private Coordinate stepCoordinate;    public StepInfo(int inStepType, Coordinate inStepCoordinate)    {      stepType = inStepType;      stepCoordinate = inStepCoordinate;    }    public int getStepType()    {      return stepType;    }    public Coordinate getStepCoordinate()    {      return stepCoordinate;    }  }/*----------------------------------------------------------------------------*/  private void redrawVectorBuffer(Graphics g)  {    for (int i=0;i<vLine.size();i++){      g.setColor(((Coordinate)vLine.elementAt(i)).colour());      g.drawLine(((Coordinate)vLine.elementAt(i)).getX1(),((Coordinate)vLine.elementAt(i)).getY1(),((Coordinate)vLine.elementAt(i)).getX2(),((Coordinate)vLine.elementAt(i)).getY2());    }    for (int i=0;i<vOval.size();i++){      g.setColor(((Coordinate)vOval.elementAt(i)).colour());      g.drawOval(((Coordinate)vOval.elementAt(i)).getX1(),((Coordinate)vOval.elementAt(i)).getY1(),((Coordinate)vOval.elementAt(i)).getX2()-((Coordinate)vOval.elementAt(i)).getX1(),((Coordinate)vOval.elementAt(i)).getY2()-((Coordinate)vOval.elementAt(i)).getY1());    }    for (int i=0;i<vSolidOval.size();i++){      g.setColor(((Coordinate)vSolidOval.elementAt(i)).colour());      g.fillOval(((Coordinate)vSolidOval.elementAt(i)).getX1(),((Coordinate)vSolidOval.elementAt(i)).getY1(),((Coordinate)vSolidOval.elementAt(i)).getX2()-((Coordinate)vSolidOval.elementAt(i)).getX1(),((Coordinate)vSolidOval.elementAt(i)).getY2()-((Coordinate)vSolidOval.elementAt(i)).getY1());    }    for (int i=0;i<vSquare.size();i++){      g.setColor(((Coordinate)vSquare.elementAt(i)).colour());      g.drawRect(((Coordinate)vSquare.elementAt(i)).getX1(),((Coordinate)vSquare.elementAt(i)).getY1(),((Coordinate)vSquare.elementAt(i)).getX2()-((Coordinate)vSquare.elementAt(i)).getX1(),((Coordinate)vSquare.elementAt(i)).getY2()-((Coordinate)vSquare.elementAt(i)).getY1());    }    for (int i=0;i<vSolidSquare.size();i++){      g.setColor(((Coordinate)vSolidSquare.elementAt(i)).colour());      g.fillRect(((Coordinate)vSolidSquare.elementAt(i)).getX1(),((Coordinate)vSolidSquare.elementAt(i)).getY1(),((Coordinate)vSolidSquare.elementAt(i)).getX2()-((Coordinate)vSolidSquare.elementAt(i)).getX1(),((Coordinate)vSolidSquare.elementAt(i)).getY2()-((Coordinate)vSolidSquare.elementAt(i)).getY1());    }  }}highlightSyntax('javaZjAxNT','java'); Ýòî ñîîáùåíèå îòðåäàêòèðîâàë V0lk0d@V - 14.4.2005, 02:24

- 400 ñòðîê êîäà - êîìó îõîòà ðçáèðàòüñÿ? Âûäåëè ãëàâíîå. paintComponent(Graphics g) âûçûâàåòñÿ îòäåëüíûì ïîòîêîì. ×òîáû äàòü êîìàíäó íà âûçîâ ýòîãî ìåòîäà, èñïîëüçóåòñÿ ìåòîä repaint() íà íóæíîì êîìïîíåíòå.

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