How to set background image in Java

Question

I am developing a simple platform game using Java using BlueJ as the IDE  Right now I have player enemy sprites  platforms and other items in the game drawn using polygons and simple shapes  Eventually I hope to replace them with actual images   For now I would like to know what is the simplest solution to setting an image  either URL or from local source  as the  background  of my game window canvas   I would appreciate it if it isn t something long or complex as my programming skills aren t very good and I want to keep my program as simple as possible  Kindly provide example codes with comments to elaborate on their function  and also if it s in its own class  how to call on relevant methods used by it on other classes   Thank you very much

User · Answer

The Path is the only thing you really have to worry about if you are really new to Java. You need to drag your image into the main project file, and it will show up at the very bottom of the list.

Then the file path is pretty straight forward. This code goes into the constructor for the class.

    img = Toolkit.getDefaultToolkit().createImage("/home/ben/workspace/CS2/Background.jpg");

CS2 is the name of my project, and everything before that is leading to the workspace.

User · Answer

Firstly create a new class that extends the WorldView class  I called my new class Background  So in this new class import all the Java packages you will need in order to override the paintBackground method  This should be   import city soi platform    import java awt Graphics2D  import java awt Image  import java awt image ImageObserver  import javax swing ImageIcon  import java awt geom AffineTransform    Next after the class name make sure that it says extends WorldView  Something like this   public class Background extends WorldView   Then declare the variables game of type Game and an image variable of type Image something like this   private Game game  private Image image    Then in the constructor of this class make sure the game of type Game is in the signature of the constructor and that in the call to super you will have to initialise the WorldView  initialise the game and initialise the image variables  something like this   super game getCurrentLevel   getWorld    game getWidth    game getHeight     this game   game  bg    new ImageIcon  lol png    getImage      Then you just override the paintBackground method in exactly the same way as you did when overriding the paint method in the Player class  Just like this   public void paintBackground Graphics2D g    float x   getX    float y   getY    AffineTransform transform   AffineTransform getTranslateInstance x y   g drawImage bg  transform  game getView         Now finally you have to declare a class level reference to the new class you just made in the Game class and initialise this in the Game constructor  something like this   private Background image   And in the Game constructor  image   new Background this     Lastly all you have to do is add the background to the frame  That s the thing I m sure we were all missing  To do that you have to do something like this after the variable frame has been declared   frame add image     Make sure you add this code just before frame pack     Also make sure you use a background image that isn t too big   Now that s it  Ive noticed that the game engines can handle JPEG and PNG image formats but could also support others  Even though this helps include a background image in your game  it is not perfect  Because once you go to the next level all your platforms and sprites are invisible and all you can see is your background image and any JLabels Jbuttons you have included in the game

User · Answer

Or try this     try     this setContentPane      new JLabel new ImageIcon ImageIO read new File  your file jpeg          catch  IOException e

User · Answer

lt script gt  function SetBack dir        document getElementById  body   style backgroundImage dir    SetBack  url myniftybg gif      lt  script gt

User · Answer

The answer will vary slightly depending on whether the application or applet is using AWT or Swing    Basically  classes that start with J such as JApplet and JFrame are Swing  and Applet and Frame are AWT    In either case  the basic steps would be    Draw or load an image into a Image object  Draw the background image in the painting event of the Component you want to draw the background in    Step 1  Loading the image can be either by using the Toolkit class or by the ImageIO class   The Toolkit createImage method can be used to load an Image from a location specified in a String   Image img   Toolkit getDefaultToolkit   createImage  background jpg      Similarly  ImageIO can be used   Image img   ImageIO read new File  background jpg      Step 2  The painting method for the Component that should get the background will need to be overridden and paint the Image onto the component   For AWT  the method to override is the paint method  and use the drawImage method of the Graphics object that is handed into the paint method   public void paint Graphics g           Draw the previously loaded image to Component      g drawImage img  0  0  null           Draw sprites  and other things                  For Swing  the method to override is the paintComponent method of the JComponent  and draw the Image as with what was done in AWT   public void paintComponent Graphics g           Draw the previously loaded image to Component      g drawImage img  0  0  null           Draw sprites  and other things                  Simple Component Example  Here s a Panel which loads an image file when instantiated  and draws that image on itself   class BackgroundPanel extends Panel          The Image to store the background image in      Image img      public BackgroundPanel                    Loads the background image and stores in img object          img   Toolkit getDefaultToolkit   createImage  background jpg               public void paint Graphics g                   Draws the img to the BackgroundPanel          g drawImage img  0  0  null             For more information on painting    Painting in AWT and Swing Lesson  Performing Custom Painting from The Java Tutorials may be of help

[java] How to set background image in Java?

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