Hintergrundbild für JFrame

JavaNobody123 · 14. Feb 2012

Hallo leute,

ich habe einen JFrame und möchte auf eine relativ einfache Weise ein Hintergrundbild einbiden. Die Methode in youtube (How to set a background image for a JFrame using Jlabel - YouTube) mit dem JLabel Icon habe ich schon versucht... Bei mir ist aber nichts zu sehen!

Über jede Idee würde ich mich freuen,

MfG

Michael... · 14. Feb 2012

Hab kein youtube.

JavaNobody123 hat gesagt.:
Bei mir ist aber nichts zu sehen!

wie schaut der Code dazu aus? Ansonsten hier mal im Forum suchen. Es sollten sich einige Threads zu dem Thema finden lassen.

Jackii · 14. Feb 2012

Versuchs mal mit ein ImagePanel
Beispielcode:

Java:

class ImagePanel extends JPanel {

  private Image img;

  public ImagePanel(String img) {
    this(new ImageIcon(img).getImage());
  }

  public ImagePanel(Image img) {
    this.img = img;
    Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
    setPreferredSize(size);
    setMinimumSize(size);
    setMaximumSize(size);
    setSize(size);
    setLayout(null);
  }
  
    @Override
    public void paintComponent(Graphics g) {
        g.drawImage(img, 0, 0, null);
    }
}

und das fügst du dann so ein:

Java:

ImagePanel panel = new ImagePanel(new ImageIcon("images/hinter.jpg").getImage());
final JFrame frame = new JFrame();
[...]
frame.getContentPane().add(panel);

ich hoffe das ist das was du gesucht hast ;-)

JavaNobody123 · 14. Feb 2012

Das ist der Code von der Klasse die einen Hintergrundbild benötigt.
Gibt es keine Methode in Graphics oder Graphics2D - damit ich nicht gleich eine ganze Image Klasse implementieren muss ?!

Code:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * zeichnen.java
 *
 * Created on 19.01.2012, 12:23:57
 */
package emin;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.Line2D;


/**
 *
 * @author asa
 */
public class zeichnen extends javax.swing.JPanel {

    /** Creates new form zeichnen */
    public zeichnen() {
        
        initComponents();
 
    }
    
    int p1_x = this.getX() + 20;
    int p2_x = 300;
    int p3_x = this.getX() + 20;
    int p4_x = 300;
    int p5_x = 400;
    int p1_y = 30;
    int p2_y = 30;
    int p3_y = 200;
    int p4_y = 200;
    int p5_y = 115;
    
    int rect_width = 60;
    int rect_hight = 30;    
    int smalrect_width = 30;
    int smalrect_hight = 15;
    
    boolean p1_boolean = false;
    boolean p2_boolean = false;
    boolean p3_boolean = false;
    boolean p4_boolean = false;
    boolean p5_boolean = false;
    boolean p6_boolean = false;

    
    
    @Override
    public void paint(Graphics g) {
        super.paint(g);

        
//------------------------------------------------------------------------------------------
       //**** Signale zwischen einzelnen Elementen ****\\
//------------------------------------------------------------------------------------------
          
        ////////////////////////////////////////////////////////////////
        Graphics2D g2 = (Graphics2D)g;
        g2.setStroke(new BasicStroke(3));//lienen dicke
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);//um alles scharf zu machen
        ////////////////////////////////////////////////////////////
        
        //p1 - p2
        if (p1_boolean || p2_boolean) {
            g.setColor(Color.red);
        } 
        else {
            g.setColor(Color.BLACK);
        } 
        g.drawLine(p1_x + rect_width, p1_y + (rect_hight / 2), p2_x-(p1_x +rect_width)-40, p1_y+15 );
        g.drawLine(p2_x-(p1_x +rect_width)-40+smalrect_width,p1_y+rect_hight/2, p2_x, p2_y + (rect_hight / 2));
        
        //p1-p3
        if (p1_boolean || p3_boolean) {
            g.setColor(Color.red);
        } else {
            g.setColor(Color.BLACK);
        }       
        g.drawLine(p1_x + (rect_width / 2), p2_y + rect_hight, p3_x + (rect_width / 2),  p5_y+(smalrect_hight/2));
        g.drawLine(p1_x + (rect_width / 2),  p5_y+(smalrect_hight/2+(smalrect_hight)), p3_x + (rect_width / 2),  p3_y);
        
        //p1-p4
        if (p1_boolean || p4_boolean) {
            g.setColor(Color.red);
        } else {
            g.setColor(Color.BLACK);
        }        
        g.drawLine(p1_x + (rect_width / 2), p1_y + rect_hight, p4_x-(smalrect_width), p3_y-(rect_hight));
        g.drawLine(p4_x, p3_y-(smalrect_hight), p4_x + (rect_width / 2), p4_y);
        
        //p1-p5
        if (p1_boolean || p5_boolean) {
            g.setColor(Color.red);
        } else {
            g.setColor(Color.BLACK);
        }        
        g.drawLine(p1_x + (rect_width / 2), p1_y, p1_x + (rect_width / 2), p1_y - rect_hight);
        g.drawLine(p1_x + (rect_width / 2), p1_y - rect_hight, p5_x + (rect_width / 2), p1_y - rect_hight);
        g.drawLine(p5_x + (rect_width / 2), p1_y - rect_hight, p5_x + (rect_width / 2), p5_y);
        
        //p2-p3
        if (p2_boolean || p3_boolean) {
            g.setColor(Color.red);
        } else {
            g.setColor(Color.BLACK);
        }        
        g.drawLine(p2_x + (rect_width / 2), p2_y + rect_hight, p3_x + (rect_width+smalrect_width), p3_y-(rect_hight));
        g.drawLine( p3_x + (rect_width),  p3_y-(smalrect_hight), p3_x + (rect_width / 2), p3_y);
        
        //p2-p4
        if (p2_boolean || p4_boolean) {
            g.setColor(Color.red);
        } else {
            g.setColor(Color.BLACK);
        }
        g.drawLine(p2_x + (rect_width / 2), p2_y + rect_hight, p2_x + smalrect_width, p5_y+(smalrect_hight/2));
        g.drawLine(p2_x + (smalrect_width),p5_y+(smalrect_hight+8), p4_x + (rect_width / 2), p4_y);
        
        //p2-p5
        if (p2_boolean || p5_boolean) {
            g.setColor(Color.red);
        } else {
            g.setColor(Color.BLACK);
        }        
        g.drawLine(p2_x + (rect_width / 2), p2_y + rect_hight, p5_x + (rect_width / 2), p5_y);
        
        //p3-p4
        if (p3_boolean || p4_boolean) {
            g.setColor(Color.red);
        } else {
            g.setColor(Color.BLACK);
        }
        g.drawLine(p3_x + rect_width, p3_y + (rect_hight / 2),p2_x-(p1_x +rect_width)-40, p4_y + (rect_hight / 2));
        g.drawLine(p2_x-(p1_x +rect_width)-40+smalrect_width, p3_y + (rect_hight / 2), p4_x, p4_y + (rect_hight / 2));
        
        //p3-p5
        if (p3_boolean || p5_boolean) {
            g.setColor(Color.red);
        } else {
            g.setColor(Color.BLACK);
        }        
        g.drawLine(p3_x + (rect_width / 2), p3_y + rect_hight, p3_x + (rect_width / 2), p3_y + rect_hight + rect_hight);
        g.drawLine(p3_x + (rect_width / 2), p3_y + rect_hight + rect_hight, p5_x + (rect_width / 2), p3_y + rect_hight + rect_hight);
        g.drawLine(p5_x + (rect_width / 2), p3_y + rect_hight + rect_hight, p5_x + (rect_width / 2), p5_y + (rect_hight));
        
                
        //p4-p5
        if (p4_boolean || p5_boolean) {
            g.setColor(Color.red);
        } else {
            g.setColor(Color.BLACK);
        }    
        g.drawLine(p4_x + rect_width, p4_y + (rect_hight / 2), p5_x + (rect_width / 2), p5_y + rect_hight);
        
        //p4-p5
        if (p5_boolean || p6_boolean) {
            g.setColor(Color.red);
        } else {
            g.setColor(Color.BLACK);
        }    
        g.drawLine(p5_x + rect_width, p5_y + (rect_hight / 2), p5_x+(2*rect_width),  p5_y + (rect_hight / 2));
        
        //HWs zu Auswertunsmodul
        if (p1_boolean || p2_boolean || p3_boolean || p4_boolean || p5_boolean || p6_boolean) {
            g.setColor(Color.red);
        } else {
            g.setColor(Color.BLACK);
        }
        
        g.drawLine(p4_x-(smalrect_width), p3_y-22, (p2_x-(p1_x+rect_width)-55)+rect_width , p3_y-16);      //////////////////////////////
        g.drawLine(p3_x+rect_width+smalrect_width, p3_y-22,(p2_x-(p1_x+rect_width)-55), p3_y-16);     //////////////////////////////
        
        g.drawLine((p2_x-(p1_x+rect_width)-40)+smalrect_width/2, p4_y+(smalrect_hight/2), (p2_x-(p1_x+rect_width)-40)+smalrect_width/2 , p3_y);       
        g.drawLine(p1_x+(smalrect_width/2)+smalrect_width, (p5_y+(smalrect_hight/2))+7, (p2_x-(p1_x+rect_width)-40)+smalrect_width/2, p3_y-rect_hight);       
        g.drawLine(p2_x+(smalrect_width/2), (p5_y+(smalrect_hight/2))+7, (p2_x-(p1_x+rect_width)-40)+smalrect_width/2, p3_y-rect_hight);       
        g.drawLine(p2_x-(p1_x +rect_width)-25, p1_y+smalrect_hight+8, (p2_x-(p1_x+rect_width)-40)+smalrect_width/2, p3_y-rect_hight);
        
        
        
        
//------------------------------------------------------------------------------------------
        //**** Prozessoren ****\\
//------------------------------------------------------------------------------------------    
        //was zuletzt programmiert wird wird auch zuletzt gezeichnet daher erstmal die lienen und dann die viereck
        //und jetzt sieht man die viereck über die lienen
        
        
        g2.setStroke(new BasicStroke(1));
        //***P1***//
        g.drawRect(p1_x, p1_y, rect_width, rect_hight);
        g.setColor(Color.green);
        
        g.fillRect(p1_x+1, p1_y+1, rect_width-1, rect_hight-1); 
        if(p1_boolean){
         g.setColor(Color.red);    
         g.fillRect(p1_x+1, p1_y+1, rect_width-1, rect_hight-1);              
        }
        g.setColor(Color.black);
        g.drawString("P1", p1_x + 25, p1_y + 20);
        
        //***P2***//
        g.drawRect(p2_x, p2_y, rect_width, rect_hight);
        g.setColor(Color.green);
        g.fillRect(p2_x+1, p2_y+1, rect_width-1, rect_hight-1);
        if(p2_boolean){
         g.setColor(Color.red);   
         g.fillRect(p2_x+1, p2_y+1, rect_width-1, rect_hight-1);
        }
        g.setColor(Color.black);
        g.drawString("P2", p2_x + 25, p2_y + 20);
        
        //***P3***//
        g.drawRect(p3_x, p3_y, rect_width, rect_hight);
        g.setColor(Color.green);
        g.fillRect(p3_x+1, p3_y+1, rect_width-1, rect_hight-1);
        if(p3_boolean){
         g.setColor(Color.red);   
         g.fillRect(p3_x+1, p3_y+1, rect_width-1, rect_hight-1);  
        }
        g.setColor(Color.black);
        g.drawString("P3", p3_x + 25, p3_y + 20);
        
        //***P4***//
        g.drawRect(p4_x, p4_y, rect_width, rect_hight);
        g.setColor(Color.green);
        g.fillRect(p4_x+1, p4_y+1, rect_width-1, rect_hight-1);
        if(p4_boolean){
         g.setColor(Color.red);
         g.fillRect(p4_x+1, p4_y+1, rect_width-1, rect_hight-1);
        }
        g.setColor(Color.black);
        g.drawString("P4", p4_x + 25, p4_y + 20);
        
        //***DPR-Modul***//
        g.drawRect(p5_x, p5_y, rect_width, rect_hight);
        g.setColor(Color.green); 
        g.fillRect(p5_x+1, p5_y+1, rect_width-1, rect_hight-1);
        if (p5_boolean) {
            g.setColor(Color.red);
        }
        g.setColor(Color.black);
        g.drawString("DPR", p5_x + 25, p5_y + 20);
        
        //***Core Com-Modul***//
        g.drawRect(p5_x+(2*rect_width), p5_y, rect_width, rect_hight);
        g.setColor(Color.green);
        g.fillRect(p5_x+(2*rect_width)+1, p5_y+1, rect_width-1, rect_hight-1);
        if (p6_boolean) {
            g.setColor(Color.red);
        }
        g.setColor(Color.black);
        g.drawString("Core COM", p5_x + 5+ (2*rect_width), p5_y + 20);
        
        //***Auswertungsmodul***//
        g.drawRect(p2_x-(p1_x+rect_width)-55 , p3_y-(rect_hight), rect_width, rect_hight);
        g.setColor(Color.green);
        g.fillRect((p2_x-(p1_x+rect_width)-55)+1 , p3_y-(rect_hight)+1, rect_width-1, rect_hight-1);
        if (p6_boolean) {
            g.setColor(Color.red);
        }
        g.setColor(Color.black);
        g.drawString("Auswertung", (p2_x-(p1_x+rect_width)-55)+1 , (p3_y-rect_hight/2)+3);
        
//------------------------------------------------------------------------------------------
        //**** HW-Vergleicher ****\\
//------------------------------------------------------------------------------------------       
        //////////////////////////////////////////////////////////////////////////
        //die kleine viereck muss mann mit weiss full machen sonst sieht man die die linen drauf
        g.setColor(Color.white);
        g.fillRect(p2_x - (p1_x + rect_width) - 40, p1_y + 7, smalrect_width, smalrect_hight);
        g.fillRect(p2_x + (smalrect_width / 2), p5_y + (smalrect_hight / 2), smalrect_width, smalrect_hight);
        g.fillRect(p2_x - (p1_x + rect_width) - 40, p4_y + (smalrect_hight / 2), smalrect_width, smalrect_hight);
        g.fillRect(p1_x + (smalrect_width / 2), p5_y + (smalrect_hight / 2), smalrect_width, smalrect_hight);
        g.fillRect(p3_x + rect_width, p3_y - (rect_hight), smalrect_width, smalrect_hight);
        g.fillRect(p4_x - (smalrect_width), p3_y - (rect_hight), smalrect_width, smalrect_hight);
        /////////////////////////////////////////////////////////////////////
        //Zwischen P1 und P2
        g.setColor(Color.BLACK);
        g.drawRect(p2_x-(p1_x +rect_width)-40, p1_y+7, smalrect_width, smalrect_hight);
        g.drawString("HW", p2_x-(p1_x +rect_width)-32, p1_y+20);
        
        
        
        //Zwischen P2 und P4
        g.setColor(Color.BLACK);
        g.drawRect(p2_x+(smalrect_width/2), p5_y+(smalrect_hight/2), smalrect_width, smalrect_hight);
        g.drawString("HW", p2_x+25, p5_y+(smalrect_hight/2)+12);
        
        //Zwischen P3 und P4
        g.setColor(Color.BLACK);
        g.drawRect(p2_x-(p1_x+rect_width)-40, p4_y+(smalrect_hight/2) , smalrect_width, smalrect_hight);
        g.drawString("HW", p2_x-(p1_x+rect_width)-32, p4_y+20);
        
        //Zwischen P1 und P3
        g.setColor(Color.BLACK);
        g.drawRect(p1_x+(smalrect_width/2), p5_y+(smalrect_hight/2) , smalrect_width, smalrect_hight);         
        g.drawString("HW", p1_x+((rect_width-smalrect_width)-5), p5_y+(smalrect_hight/2)+12);
                
        //Zwischen P1 und P4
        g.setColor(Color.BLACK);
        g.drawRect(p3_x+rect_width, p3_y-(rect_hight) , smalrect_width, smalrect_hight);        
        g.drawString("HW", p3_x+rect_width+8, p3_y-(rect_hight-13));
        
        //Zwischen P2 und P4
        g.setColor(Color.BLACK);
        g.drawRect(p4_x-(smalrect_width), p3_y-(rect_hight) , smalrect_width, smalrect_hight);
        g.drawString("HW", p4_x-((rect_width-smalrect_width)-7),  p3_y-(rect_hight-13));       
        
        
        
        
    }

    public boolean isP1_boolean() {
        return p1_boolean;
    }

    public void setP1_boolean(boolean p1_boolean) {
        this.p1_boolean = p1_boolean;
    }

    public boolean isP2_boolean() {
        return p2_boolean;
    }

    public void setP2_boolean(boolean p2_boolean) {
        this.p2_boolean = p2_boolean;
    }

    public boolean isP3_boolean() {
        return p3_boolean;
    }

    public void setP3_boolean(boolean p3_boolean) {
        this.p3_boolean = p3_boolean;
    }

    public boolean isP4_boolean() {
        return p4_boolean;
    }

    public void setP4_boolean(boolean p4_boolean) {
        this.p4_boolean = p4_boolean;
    }

    public boolean isP5_boolean() {
        return p5_boolean;
    }

    public void setP5_boolean(boolean p5_boolean) {
        this.p5_boolean = p5_boolean;
    }
    

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        setName("Form"); // NOI18N

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );
    }// </editor-fold>                        
    // Variables declaration - do not modify                     
    // End of variables declaration                   
}

Michael... · 14. Feb 2012

JavaNobody123 hat gesagt.:
Das ist der Code von der Klasse die einen Hintergrundbild benötigt.
Gibt es keine Methode in Graphics oder Graphics2D - damit ich nicht gleich eine ganze Image Klasse implementieren muss ?!

Die obige Klasse ist auch "nur" ein JPanel. Man kann also in Deiner Klasse genau das selbe machen wie oben gepostet.
Bei Swing Komponenten sollte man sich angewöhnen paintComponent(Graphics g) anstatt paint(Graphics g) zu überschreiben.

JavaNobody · 14. Feb 2012

Es funktioniert nicht, füge ich quasie die Klasse in meine einfach oben ein oder wie ist das gemeint! Kann mir jemand mal ein Codesnippet senden ?!

Jackii · 15. Feb 2012

Wie hast du das denn eingefügt??

Ich habe dir mal eine Klasse hallo.java geschrieben xD

Java:

public class hallo {
   public static void main(String[] args) {
            new StartBild().los();
    }

    public void los() {
        ImagePanel panel = new ImagePanel(new ImageIcon("images/hinter.jpg").getImage());
        //hier kommt noch mehr Code rein
        //Frame, Grösse des Frames, Layout und
        //z.B. Buttons, ActionListener, Labels ect
    }
}

class ImagePanel extends JPanel {

  private Image img;

  public ImagePanel(String img) {
    this(new ImageIcon(img).getImage());
  }

  public ImagePanel(Image img) {
    this.img = img;
    Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
    setPreferredSize(size);
    setMinimumSize(size);
    setMaximumSize(size);
    setSize(size);
    setLayout(null);
  }
  
    @Override
    public void paintComponent(Graphics g) {
        g.drawImage(img, 0, 0, null);
    }
}

Ich hoffe das ist das was du gesucht hast.

Hintergrundbild für JFrame

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