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Thread: JFrame

  1. #1
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    Default JFrame

    EDIT: Sent the project to a friend, who compiled it and says it appears fine on his display, this had led me to believe that it's either my OS, GPU or Monitor, either way I guess this means it is independent of my code. Please check over if you will and insure I have done everything correctly, in case the error can be resolved this way! Thanks

    Ok, so I took a first try at making a simple window using a JFrame, ready to be drawn on with images. My CanvasHolder class extends Canvas, and is the component I'm using with a BufferStrategy of 2 to draw to the screen. For the moment, I am not drawing anything other than a clearRect to clear the screen of the previous data (when some will be present).

    As this code stands, -sometimes- it works (3/5 times), and I get a red background as I should (I'm using red for the sake of ease of knowing that what I'm writing is working). The other 2/5 times I just get a white screen that when clicked outside of closes.

    Also, the times where it does work, the boundary seems to start a certain amount of pixels to the right, giving me a black band across the left which is not accessible by the mouse. This occurs no matter what resolution I set it to perform at.

    Like I said, this is my first attempt at something in Java using a JFrame, I might have blatently done something very wrong or that is very bad practice, any advice on the following code would be great.

    Thanks guys.

    Main Class:
    package mainPackage;
     
    import java.awt.DisplayMode;
    import java.awt.GraphicsConfiguration;
    import java.awt.GraphicsDevice;
    import java.awt.GraphicsEnvironment;
     
    import javax.swing.JFrame;
     
    import canvasPackage.CanvasHolder;
     
    public class MainMethod 
    {
    	//fields to hold screen resolution
    	private static int xResolution;
    	private static int yResolution;
     
    	//JFrame variable to hold JFrame that holds the canvas
    	private static JFrame jFrame;
     
     
    	//main
    	public static void main(String[] args) 
    	{
    		//apply wanted resolution
    		setXResolution(800);
    		setYResolution(600);
     
    		//see 'initialiseGraphics()' below
    		jFrame = initialiseGraphics(xResolution, yResolution, 32, true);
     
    		//creates an instance of the canvas holder, applying a dimension of the given resolution
    		CanvasHolder canvas = new CanvasHolder(xResolution, yResolution);
     
    		//apply canvas and set characteristics
    		jFrame.add(canvas);
    		jFrame.setVisible(true);
    		jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
    		//modified method which creates bufferstrategy of required amount
    		canvas.addNotify(2);
     
    		//main 'loop', see CanvasHolder class
    		canvas.mainRenderer(xResolution, yResolution);
     
     
    	}
     
    	public static JFrame initialiseGraphics(int xResolution, int yResolution, int bitDepth, boolean isFullscreen)
    	{
    		//detect graphics environment and deduce graphics config
    		GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment();
    		GraphicsDevice device = environment.getDefaultScreenDevice();
    		GraphicsConfiguration config = device.getDefaultConfiguration();
     
    		//create new JFrame with necessary config
    		JFrame jFrame = new JFrame(config);
     
    		//if fullscreen is specified, check it is supported and change resolution to given values
    		if ( isFullscreen == true )
    		{
    			if ( device.isFullScreenSupported() ) 
    			{ 
    				device.setFullScreenWindow(jFrame);
     
    				if ( device.isDisplayChangeSupported() )
    				{
    					device.setDisplayMode( new DisplayMode( xResolution, yResolution, bitDepth, DisplayMode.REFRESH_RATE_UNKNOWN ) );
    				}
    				else
    				{
    					System.err.println("Change display mode not supported");
    				}
    			}
    			else
    			{
    				System.err.println("Full screen not supported");
    			}
    		}
     
    		return jFrame;
     
    	}
     
     
     
    	public static int getXResolution()
    	{
    		return xResolution;
    	}
     
    	public static void setXResolution(int x)
    	{
    		xResolution = x;
    	}
     
    	public static int getYResolution()
    	{
    		return yResolution;
    	}
     
    	public static void setYResolution(int y)
    	{
    		yResolution = y;
    	}
     
     
    }

    CanvasHolder class:
    package canvasPackage;
     
    import java.awt.Canvas;
    import java.awt.Color;
    import java.awt.Dimension;
    import java.awt.Graphics;
    import java.awt.Image;
    import java.awt.image.BufferStrategy;
    import java.awt.image.BufferedImage;
     
    public class CanvasHolder extends Canvas
    {	
    	//holds bufferstrategy
    	BufferStrategy bufStrat;
     
    	//constructor initiates canvas with given resolution and has focus. Background colour set here
    	public CanvasHolder(int xRes, int yRes)
    	{
    		setBackground(Color.red);
    		this.setPreferredSize(new Dimension(xRes, yRes));
    		setFocusable(true);
    		requestFocus();
     
    	}
     
    	//custom addNotify() to create buffer strategy
    	public void addNotify(int buffer)
    	{
    		super.addNotify();
    		this.createBufferStrategy(buffer);
    		this.bufStrat = this.getBufferStrategy();
    	}
     
    	public void mainRenderer(int xRes, int yRes)
    	{
    		//create graphics object to 'represent' current off-screen image
    		Graphics g = bufStrat.getDrawGraphics();
     
    		//wipe last iteration's pixels from screen ready for re-drawing
    		g.setColor(Color.red);
    		g.clearRect(0, 0, xRes, yRes);
     
    		/*
    		 * Image drawing goes here
    		 */
     
    		//switch off-screen and on-screen images and release unneeded graphics representation
    		bufStrat.show();
    		g.dispose();
     
    		//apply a sleep time to control tickrate
    		try 
    		{
    			Thread.sleep(19);
    		} 
    		catch (InterruptedException e) 
    		{
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    	}
     
    	//draw image method goes here
    	public void drawImage(Graphics g, BufferedImage bufImage, int xLocation, int yLocation)
    	{
     
    	}
    }
    Last edited by M3ss1ah; February 21st, 2011 at 10:34 AM.


  2. #2
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    Default Re: JFrame

    Actually offended that not only does this thread have no replies, but no views either. Having watched every thread before and after this one be viewed and replied on while sitting hoping someone just comments on my problem, I'm led to believe you guys aren't bothered.

    Being a new member here shouldn't effect the help received, although I presume it won't really matter to you guys, but I'll have to join some other Java community instead.

  3. #3
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    Default Re: JFrame

    It full screens, then I seem to be getting a red flicker for about a second, then it stops at white, clicking does nothing for me, it just waits for me to hit alt+f4. An explanation of the black band could be from your monitor not being adjusted correctly for the 800x600 resolution. I know when i change resolution on my lcd, i have to hit the auto button for it to fill the screen.
    Last edited by JJeng; February 23rd, 2011 at 03:54 PM.

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    Default Re: JFrame

    Moved to - AWT / Java Swing
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