Java: playing with Java 2D
There’s sometime ago I wanted to see how java 2D was working.
I came from Amiga computers, where doing double buffering was part of your job in C.
But using accellerated 2D java engine seems a lot simpler as it do the job for you 😉
Below is a little java class I coded to experiment java 2D with double buffering.
It may be wrong now since this code is quite old and its also a lot slower than the same
code on an Amiga 4000 using C language.
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import javax.swing.*; import java.awt.*; import java.awt.image.*; import java.awt.event.*; // main window public class MainWindow extends Canvas {  /* The stragey that allows us to use accelerate page flipping */  private BufferStrategy strategy;  // constructor  public MainWindow()  {    // create window    JFrame container = new JFrame("Java 2d test");    // get hold the content of the frame and set up the resolution of the game    JPanel panel = (JPanel) container.getContentPane();    panel.setPreferredSize(new Dimension(800,600));    panel.setLayout(null);    // setup our canvas size and put it into the content of the frame    setBounds(0,0,800,600);    panel.add(this);    // Tell AWT not to bother repainting our canvas since we're    // going to do that our self in accelerated mode    setIgnoreRepaint(true);    // finally make the window visible    container.pack();    container.setResizable(false);    container.setVisible(true);    // add a listener to respond to the user closing the window. If they    // do we'd like to exit the game    container.addWindowListener(new WindowAdapter() {      public void windowClosing(WindowEvent e) {        System.exit(0);      }    });    addKeyListener(new keyhandler());    // get focus to receive key events    requestFocus();    // create the buffering strategy which will allow AWT    // to manage our accelerated graphics    createBufferStrategy(2);    strategy = getBufferStrategy();    // start    Draw();  }  public void Draw()  {    int j = 0 , i = 0, r = 255,g = 255, b=255, mr = -1,mg = -1,mb = -1;    int endw = 800, endh = 600, mw=1, mh = -1;    // Get hold of a graphics context for the accelerated    // surface and blank it out    Graphics2D gfx = (Graphics2D) strategy.getDrawGraphics();    gfx.setColor(Color.black);    gfx.fillRect(0,0,endw,endh);    gfx.setColor(Color.white);    while(true)    {      gfx.setColor(new Color(r,g,b));      gfx.drawLine(i,j,endw-i,endh-j);      //gfx.draw3DRect(i,endh,i,endw,false);      gfx.drawArc(i, j, endw, endh, 45-i, 90+j);      // finally, we've completed drawing so clear up the graphics      // and flip the buffer over      //g.dispose();      strategy.show();      if(i < 800) i++;      else      {        j++;        if(j > 600)        {          j = 0;          i = 0;        }      }      r = r + (2*mr);      g = g + (5*mg);      b = b + (10*mb);      if(r <= 5) mr = 1;      else if(r >= 250) mr = -1;      if(g <= 5) mg = 1;      else if(g >= 250) mg = -1;      if(b <= 5) mb = 1;      else if(b >= 250) mb = -1;      endw+=mw;      endh+=mh;      if(endw >= 1200) mw = -1;      else if(endw <= 300) mw = 1;      if(endh >= 900) mh = -1;      else if(endh <= 50) mh = 1;      try { Thread.sleep(1); } catch (Exception e) {}    }  }  private class keyhandler extends KeyAdapter  {    public void keyTyped(KeyEvent e)    {      System.exit(0);    }  }  // main function  public static void main(String[] args)  {    new MainWindow();  } } |