[es] - Presjek dva poligona

Ostap Bender

Član broj: 79519
Poruke: 6
193.198.17.*

Profil

^{29.05.2007. u 17:12 - pre 206 meseci}

Dobio sam zadatak, u kojem trebam odrediti povrsinu presjeka dva proizvoljno odredjena poligona pomocu klikanja na radnoj povrsini. Nazalost prilicno sam nevjest u programiranju i jedino sam uspio da izguglam kod za program koji crta beskonacno poligona.

Code:

/*
      This applet lets the user draw colored polygons.
      The user inputs a polygon by clicking a series of points.
      Clicking near the starting point (within 2 pixels) or
      right-clicking (or Command-clicking) will complete the
      polygon, so the user can begin a new one.  Shift-clicking
      will clear the screen.  Up to 500 points are allowed in a
      polygon.  This applet does not keep a copy of the image
      on the screen, so it will not reappear if the applet is
      covered and then uncovered.
    */


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


    public class SimplePolygons extends Applet implements MouseListener {


       /* Variables for implementing polygon input. */

       private int[] xCoord, yCoord;  // Arrays containing the points of
                                      //   the polygon.  Up to 500 points
                                      //   are allowed.

       private int pointCt;  // The number of points that have been input.

       private final static Color polygonColor = Color.red;
                            // Color that is used to draw the polygons.

       public void init() {
             // Initialize the applet.  The applet listens for mouse events.
             // Arrays are created to hold the points.
          setBackground(Color.white);
          addMouseListener(this);
          xCoord = new int[500];
          yCoord = new int[500];
          pointCt = 0;
       }


       public void paint(Graphics g) {

             // The paint() routine does nothing but draw a 1-pixel black
             // border around the applet.  Polygons drawn on the applet
             // are not permanent.

          g.setColor(Color.black);
          g.drawRect(0, 0, getSize().width - 1, getSize().height - 1);

       }  // end paint()


       private void putLine(int x1, int y1, int x2, int y2) {
              // Draw a line from (x1,y1) to (x2,y2) directly onto the
              // applet, without going through the paint() method.
           Graphics g = getGraphics();
           g.drawLine(x1,y1,x2,y2);
           g.dispose();
       }


public void mousePressed(MouseEvent evt) {
             // Process a user mouse-click.

           if (pointCt < 2)
              return;
           Graphics g = getGraphics();
           if (pointCt == 2) {
              g.drawLine(xCoord[0], yCoord[0], xCoord[1], yCoord[1]);
           }

if (evt.isMetaDown() || pointCt == 500)    {
              g.setColor(Color.red);
              g.fillPolygon(xCoord, yCoord, pointCt);
              g.setColor(Color.black);
              g.drawPolygon(xCoord, yCoord, pointCt);
           }
          else {
                 // Add the point where the user clicked to the list of
                 // points in the polygon, and draw a line between the
                 // previous point and the current point.
             xCoord[pointCt] = evt.getX();
             yCoord[pointCt] = evt.getY();
             pointCt++;
             if (pointCt >= 2) {
                putLine(xCoord[pointCt-2], yCoord[pointCt-2],
                             xCoord[pointCt-1], yCoord[pointCt-1]);
             }
          }

       } // end mousePressed()

       public void mouseReleased(MouseEvent evt) { }
       public void mouseClicked(MouseEvent evt) { }
       public void mouseEntered(MouseEvent evt) { }
       public void mouseExited(MouseEvent evt) { }

    }  // end class SimplePolygons

Zanima me prvo kako da napravim da program iscrta samo dva poligona.

Benzin vaš - ideje naše

Odgovor na temu

bgd2500

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Poruke: 226
*.finsoft.co.yu.

+7 Profil

Re: Presjek dva poligona

^{30.05.2007. u 14:49 - pre 205 meseci}

Kod bas i ne radi to sto pise da bi trebalo,...
Evo ga malo izmenjenog pa ti dalje nastavi.

Code:

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

public class SimplePolygons extends Applet implements MouseListener {

  private final static Color polygonBorder = Color.black;
  private final static Color polygonColor = Color.red;

  private final int MAX_POINTS = 500;
  private final int MAX_POLYGONS = 2;
  private Polygon[] polygons;
  private boolean[] polygonsDone;
  private int pointCt;
  private int polygonCt;

  public void init() {
    setBackground(Color.white);
    addMouseListener(this);
    polygons = new Polygon[MAX_POLYGONS];
    polygonsDone = new boolean[MAX_POLYGONS];
    pointCt = 0;
    polygonCt = 0;
  }

  public void paint(Graphics g) {
    g.setColor(Color.black);
    g.drawRect(0, 0, getSize().width - 1, getSize().height - 1);

    for (int i=0; i<MAX_POLYGONS; i++) {
      if (polygons[i] != null) {
        if (polygonsDone[i]) {
          g.setColor(polygonColor);
          g.fillPolygon(polygons[i]);
          g.setColor(polygonBorder);
          g.drawPolygon(polygons[i]);
        } else {
          g.setColor(polygonBorder);
          g.drawPolyline(polygons[i].xpoints, polygons[i].ypoints, polygons[i].npoints);
        }
      }
    }
  }

  public void mousePressed(MouseEvent evt) {
    if (polygonCt < MAX_POLYGONS) {
      if (polygons[polygonCt] == null) {
        polygons[polygonCt] = new Polygon();
      }
      polygons[polygonCt].addPoint(evt.getX(), evt.getY());
      int pointCt = polygons[polygonCt].npoints;
      if ((evt.isMetaDown() && pointCt > 2) || pointCt == MAX_POINTS) {
        polygonsDone[polygonCt++] = true;
      }
      repaint();
    }
  }

  public void mouseReleased(MouseEvent evt) { }
  public void mouseClicked(MouseEvent evt) { }
  public void mouseEntered(MouseEvent evt) { }
  public void mouseExited(MouseEvent evt) { }

}

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