Examples of java.awt.Graphics

java.awt.Graphics
The Graphics class is the abstract base class for all graphics contexts that allow an application to draw onto components that are realized on various devices, as well as onto off-screen images.
A Graphics object encapsulates state information needed for the basic rendering operations that Java supports. This state information includes the following properties:
- The Component object on which to draw.
- A translation origin for rendering and clipping coordinates.
- The current clip.
- The current color.
- The current font.
- The current logical pixel operation function (XOR or Paint).
- The current XOR alternation color (see {@link Graphics#setXORMode}).
Coordinates are infinitely thin and lie between the pixels of the output device. Operations that draw the outline of a figure operate by traversing an infinitely thin path between pixels with a pixel-sized pen that hangs down and to the right of the anchor point on the path. Operations that fill a figure operate by filling the interior of that infinitely thin path. Operations that render horizontal text render the ascending portion of character glyphs entirely above the baseline coordinate.
The graphics pen hangs down and to the right from the path it traverses. This has the following implications:
- If you draw a figure that covers a given rectangle, that figure occupies one extra row of pixels on the right and bottom edges as compared to filling a figure that is bounded by that same rectangle.
- If you draw a horizontal line along the same y coordinate as the baseline of a line of text, that line is drawn entirely below the text, except for any descenders.
All coordinates that appear as arguments to the methods of this Graphics object are considered relative to the translation origin of this Graphics object prior to the invocation of the method.
All rendering operations modify only pixels which lie within the area bounded by the current clip, which is specified by a {@link Shape} in user space and is controlled by the program using the Graphics object. This user clip is transformed into device space and combined with the device clip, which is defined by the visibility of windows and device extents. The combination of the user clip and device clip defines the composite clip, which determines the final clipping region. The user clip cannot be modified by the rendering system to reflect the resulting composite clip. The user clip can only be changed through the setClip or clipRect methods. All drawing or writing is done in the current color, using the current paint mode, and in the current font. @version 1.74, 02/14/06 @author Sami Shaio @author Arthur van Hoff @see java.awt.Component @see java.awt.Graphics#clipRect(int,int,int,int) @see java.awt.Graphics#setColor(java.awt.Color) @see java.awt.Graphics#setPaintMode() @see java.awt.Graphics#setXORMode(java.awt.Color) @see java.awt.Graphics#setFont(java.awt.Font) @since JDK1.0

    dummy.addNotify();
    Image image = dummy.createImage(100, 100);
    if (image == null) {
      System.err.println("getFontMetrics: image is null");
    }
    Graphics graphics = image.getGraphics();
    return graphics.getFontMetrics(font);


  }

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    // Add the menubar
    menuBar = new TestMenuBar(this);
    setJMenuBar(menuBar);
       
    // Get the Graphics object for pdf writing
    Graphics pdfGraphics = null;
    job = new PDFJob(fileOutputStream);
    pdfGraphics = job.getGraphics();
    Dimension d = job.getPageDimension();
    documentDimension = d;

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      System.out.println("Error!! - drawing image is null");
      System.exit(1);
    }


    drawingArea.setImage(img);
    Graphics javaGraphics = img.getGraphics();    


    // Now we have two Graphics objects - one for java Graphics to 
    // draw to the screen , another to write 
    // to the pdf file.  We'll use the same methods to act on both 
    // objects, and (theoretically) the results should be identical.
    // If 'Print' is selected from the menu, the same methods wi
    // act on a Graphics object from the java.awt.PrintJob    


    doTest(javaGraphics, d);
    javaGraphics.dispose();


    // The whole pdf doc will be written when the program starts
    if ((!pdfDocumentAlreadyDone) && (pdfGraphics != null)) {
      doTest(pdfGraphics, d);
      pdfGraphics.dispose();

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    PrintJob pjob = toolkit.getPrintJob(this, 
                                        "PDF Test Print", 
                                        jobAttributes,  
                                        null); 
    if(pjob != null) {  
      Graphics printGraphics = pjob.getGraphics(); 
      if (currentPage == 1) {
        doTest(printGraphics, documentDimension); 
        printGraphics.dispose();
        pjob.end(); 
      }
      else {
        doSecondPageTest(printGraphics);
        printGraphics.dispose();
        pjob.end();
      }
    } 
    else { 
      System.err.println("Can't print: printjob null");

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      System.out.println("Error!! - drawing image is null");
      System.exit(1);
    }


    drawingArea.setImage(img);
    Graphics javaGraphics = img.getGraphics();    
   
    doSecondPageTest(javaGraphics);
    javaGraphics.dispose();


    currentPage = 2;
    drawingArea.repaint();
    drawingArea.revalidate();
  }

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        int pwidth = 512;
        int pheight = 512;


        AcmeGifFormatter formatter = new AcmeGifFormatter();
        Graphics graphics = formatter.getGraphics(pwidth, pheight);


        Paint background;
        if (map == null) {
            background = MapBean.DEFAULT_BACKGROUND_COLOR;
        } else {

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            if (drawingBuffer == null) {
                drawingBuffer = createImage(w, h);
            }


            // draw the old image
            Graphics gr = getMapBeanRepaintPolicy().modifyGraphicsForPainting(drawingBuffer.getGraphics());


            if (clip == null) {
                gr.setClip(0, 0, w, h);
            } else {
                gr.setClip(clip);
            }
            // gr.drawImage(drawingBuffer,0,0,null);
            if (Debug.debugging("mapbean")) {
                Debug.output("BufferedMapBean.rendering layers to buffer.");
            }


            paintChildrenWithBorder(gr, false);


            // reset the clip to full map
            // gr.setClip(0, 0, w, h);
            gr.dispose();
        } else if (Debug.debugging("mapbean")) {
            Debug.output("BufferedMapBean.rendering buffer.");
        }


        // Should be be clipping the graphics here? I'm not sure.

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        if( newMetricsNeeded ) {
            calculateSize();
        }
        
        stringImage = createImage(stringWidth, stringHeight);
        Graphics graphics = stringImage.getGraphics();


        //  Draw shadow
        if( shadowEnabled ) {
            graphics.setColor(getShadow());
            graphics.drawString(message, shadowX, stringAscent + shadowY);
        }


        //  Draw foreground
        graphics.setColor(getForeground());
        graphics.drawString(message, 0, stringAscent);
    }

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  /**  
  * Paint the ticks in the panel.
  */
    public void paint(Graphics g) {
  Graphics mygfx;


  if (labelFont != null) {
      mygfx = g.create();
      mygfx.setFont(labelFont);
  }  // Just in case, requested font unavailable
  else
      mygfx = g;


  FontMetrics fm = mygfx.getFontMetrics();


  int offset = 0;
  double w = (double) size.width;
  double ppu = w / (max - min);
  while (ppu * tickIncrement < 2) {
      tickIncrement += 10;
  }


  int pix_inc = (int)(tickIncrement * ppu);
  int labelSpan = labelIncrement * tickIncrement;


  for (int i = min, x = 0, j = 0; 
    i <= max; 
    i += tickIncrement, x += pix_inc) {
      if (i % labelSpan == 0) {
     String label = String.valueOf(min + (j * labelSpan));
    offset = 0;
    // Place leftmost label to right
    if (i != min) 
        offset = fm.stringWidth(label) / 2;
          if (i >= max)  // Place rightmost label to left
        offset = fm.stringWidth(label);
    
    mygfx.drawString(label, x - offset, size.height/2);
          mygfx.drawLine(x, size.height/2, x, size.height); 
    j++;
      } else 
    mygfx.drawLine(x, 3 * size.height/4, x, size.height);
        }


  if (labelFont != null)
      mygfx.dispose();
    }

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    VideoFormat vf = (VideoFormat) cbuffer.getFormat();
    bti = new BufferToImage(vf);
      }
      if (bti != null && component != null) {
    Image im = bti.createImage(cbuffer);
    Graphics g = component.getGraphics();
    Dimension size = component.getSize();
    if (g != null)
        g.drawImage(im, 0, 0, component);
      }
  }


  // Maybe synchronize this with setTransferHandler() ?
  if (transferHandler != null && cds.delStarted)

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