graphic_editor/src/mvcgrafik/view/GrafikView.java

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package mvcgrafik.view;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.util.logging.Logger;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.standard.DialogTypeSelection;
import javax.swing.JComponent;
import javax.swing.JOptionPane;
import mvcgrafik.model.GrafikModel;

/**
 *
 * @author le
 */
public class GrafikView extends JComponent implements Printable
{
  private final static Dimension EINS = new Dimension(1, 1);
  private final static Logger lg = Logger.getLogger("mvcGrafik");
  private Rectangle2D.Float pixel;
  private GrafikModel model;
  private Point old_punkt = null;

  public GrafikView()
  {
    pixel = new Rectangle2D.Float();
    this.setBackground(Color.WHITE);
  }

  public void setModel(GrafikModel model)
  {
    this.model = model;
  }

  public void drawLine(Point p, Point p_old)
  {
    Graphics2D g2 = (Graphics2D) this.getGraphics();
    Line2D.Double line = new Line2D.Double(p.getX(),p.getY(),p_old.getX(),p_old.getY());
//    pixel.setFrame(p, EINS);
    g2.draw(line);
    g2.dispose(); // VERY, VERY WICHTIG
  }

  @Override
  public void paintComponent(Graphics g)
  {
    if (model == null)
    {
      lg.severe("keine Referenz auf Model vorhanden");
      return;
    }
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D) g;

    model.getFigures().forEach(figure -> {
      figure.getPunkte().forEach(punkt -> {
        pixel.setFrame(punkt, EINS);
//        g2.draw(pixel);
        if(old_punkt != null)
        {
          drawLine(punkt, old_punkt);
        }
        old_punkt = punkt;
      });
    });
  }
  
  public void doPrint()
  {
    HashPrintRequestAttributeSet printSet = 
     new HashPrintRequestAttributeSet();
    printSet.add(DialogTypeSelection.NATIVE);
    PrinterJob pj = PrinterJob.getPrinterJob();
    pj.setPrintable(this);
    // Druckdialog
    if (pj.printDialog(printSet))
    {
      try
      {
        pj.print(printSet);
      }
      catch (Exception ex)
      {
        JOptionPane.showMessageDialog(this, ex.toString());
      }
    }
  }

  @Override
  public int print(Graphics gp, PageFormat pf, int pageIndex) throws PrinterException
  {
    Graphics2D g2p = (Graphics2D) gp;
    if (pageIndex == 1)
    {
      g2p.translate(pf.getImageableX(), pf.getImageableY());
      g2p.scale(pf.getImageableWidth()/pf.getWidth(), 
                pf.getImageableHeight() / pf.getHeight());
      super.print(g2p);
      return Printable.PAGE_EXISTS;
    }
    else
    {
      return Printable.NO_SUCH_PAGE;
    }
  }

}