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

  @Override
  public void paintInstance(InstancePainter painter) {
    Location loc = painter.getLocation();
    int x = loc.getX();
    int y = loc.getY();
    Graphics g = painter.getGraphics();
    g.translate(x, y);
    g.setColor(Color.BLACK);
    paintGhost(painter);
    g.translate(-x, -y);
  }

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      g.fillRect(BORDER, BORDER, dim.width, dim.height);
      GraphicsUtil.switchToWidth(g, 1);
      g.setColor(defaultColor);
    }


    Graphics g2 = g.create();
    g2.translate(BORDER, BORDER);
    item.paintIcon(ToolbarButton.this, g2);
    g2.dispose();


    // draw selection indicator
    if (toolbar.getToolbarModel().isSelected(item)) {
      Dimension dim = item.getDimension(toolbar.getOrientation());
      GraphicsUtil.switchToWidth(g, 2);

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  }
  
  @Override
  protected void paintForeground(Graphics g) {
    double zoom = grid.getZoomFactor();
    Graphics gScaled = g.create();
    if (zoom != 1.0 && zoom != 0.0 && gScaled instanceof Graphics2D) {
      ((Graphics2D) gScaled).scale(zoom, zoom);
    }
    super.paintForeground(gScaled);
    gScaled.dispose();
  }

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        .expand(BORDER_SIZE);
      int width = (int) Math.round(bds.getWidth() * scale);
      int height = (int) Math.round(bds.getHeight() * scale);
      BufferedImage img = new BufferedImage(width, height,
          BufferedImage.TYPE_INT_RGB);
      Graphics base = img.getGraphics();
      Graphics g = base.create();
      g.setColor(Color.white);
      g.fillRect(0, 0, width, height);
      g.setColor(Color.black);
      if (g instanceof Graphics2D) {
        ((Graphics2D) g).scale(scale, scale);
        ((Graphics2D) g).translate(-bds.getX(), -bds.getY());
      } else {
        JOptionPane.showMessageDialog(frame,
            Strings.get("couldNotCreateImage"));
        monitor.close();
      }


      CircuitState circuitState = canvas.getProject().getCircuitState(circuit);
      ComponentDrawContext context = new ComponentDrawContext(canvas,
          circuit, circuitState, base, g, printerView);
      circuit.draw(context, null);


      File where;
      if (dest.isDirectory()) {
        where = new File(dest, circuit.getName() + filter.extensions[0]);
      } else if (filter.accept(dest)) {
        where = dest;
      } else {
        String newName = dest.getName() + filter.extensions[0];
        where = new File(dest.getParentFile(), newName);
      }
      try {
        switch (filter.type) {
        case FORMAT_GIF: GifEncoder.toFile(img, where, monitor); break;
        case FORMAT_PNG: ImageIO.write(img, "PNG", where); break;
        case FORMAT_JPG: ImageIO.write(img, "JPEG", where); break;
        }
      } catch (Exception e) {
        JOptionPane.showMessageDialog(frame,
            Strings.get("couldNotCreateFile"));
        monitor.close();
        return;
      }
      g.dispose();
      monitor.close();
    }

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  // user interface methods
  //
  @Override
  public void drawGhost(ComponentDrawContext context,
      Color color, int x, int y, AttributeSet attrs) {
    Graphics g = context.getGraphics();
    Object dir = attrs.getValue(Wire.dir_attr);
    int len = attrs.getValue(Wire.len_attr).intValue();


    g.setColor(color);
    GraphicsUtil.switchToWidth(g, 3);
    if (dir == Wire.VALUE_HORZ) {
      g.drawLine(x, y, x + len, y);
    } else {
      g.drawLine(x, y, x, y + len);
    }
  }

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  //
  // user interface features
  //  
  @Override
  public void paintGhost(InstancePainter painter) {
    Graphics g = painter.getGraphics();
    Color fg = g.getColor();
    int v = fg.getRed() + fg.getGreen() + fg.getBlue();
    Composite oldComposite = null;
    if (g instanceof Graphics2D && v > 50) {
      oldComposite = ((Graphics2D) g).getComposite();
      Composite c = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f);

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        back = label.indexOf('\\', back + 2);
      }
      
      int x = bds.getX() + bds.getWidth() / 2;
      int y = bds.getY() + bds.getHeight() / 2;
      Graphics g = painter.getGraphics().create();
      double angle = Math.PI / 2 - (up.toRadians() - defaultFacing.toRadians()) - facing.toRadians();
      if (g instanceof Graphics2D && Math.abs(angle) > 0.01) {
        Graphics2D g2 = (Graphics2D) g;
        g2.rotate(angle, x, y);
      }
      g.setFont(font);
      if (lines == 1 && !backs) {
        GraphicsUtil.drawCenteredText(g, label, x, y);
      } else {
        FontMetrics fm = g.getFontMetrics();
        int height = fm.getHeight();
        y = y - (height * lines - fm.getLeading()) / 2 + fm.getAscent(); 
        back = label.indexOf('\\');
        while (back >= 0 && back <= label.length() - 2) {
          char c = label.charAt(back + 1);
          if (c == 'n') {
            String line = label.substring(0, back);
            GraphicsUtil.drawText(g, line, x, y,
                GraphicsUtil.H_CENTER, GraphicsUtil.V_BASELINE);
            y += height;
            label = label.substring(back + 2);
            back = label.indexOf('\\');
          } else if (c == '\\') {
            label = label.substring(0, back) + label.substring(back + 1);
            back = label.indexOf('\\', back + 1);
          } else {
            back = label.indexOf('\\', back + 2);
          }
        }
        GraphicsUtil.drawText(g, label, x, y,
            GraphicsUtil.H_CENTER, GraphicsUtil.V_BASELINE);
      }
      g.dispose();
    }
  }

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    }
  }


  @Override
  public void paintIcon(ComponentDrawContext c, int x, int y) {
    Graphics g = c.getGraphics();
    g.fillRect(x + 2, y + 1, 9, 2);
    g.drawRect(x + 2, y + 3, 15, 12);
    g.setColor(Color.lightGray);
    g.drawLine(x + 4, y + 2, x + 8, y + 2);
    for (int y_offs = y + 6; y_offs < y + 15; y_offs += 3) {
      g.drawLine(x + 4, y_offs, x + 14, y_offs);
    }
  }

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          if (label == null || label.equals("")) {
            y += bds.getHeight() / 2;
          } else {
            y += 3 * bds.getHeight() / 4;
          }
          Graphics g = painter.getGraphics();
          for (int i = 0; i < len; i++) {
            String s = data.get(len - 1 - i).toHexString();
            GraphicsUtil.drawCenteredText(g, s, x, y);
            x += 10;
          }
        }
      } else {
        Bounds bds = painter.getBounds();
        int x = bds.getX() + bds.getWidth() / 2;
        int y = bds.getY();
        int h = bds.getHeight();
        Graphics g = painter.getGraphics();
        Object label = painter.getAttributeValue(StdAttr.LABEL);
        if (label == null || label.equals("")) {
          String a = Strings.get("shiftRegisterLabel1");
          GraphicsUtil.drawCenteredText(g, a, x, y + h / 4);
        }

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        facing.reverse(), select.getWidth() == 1 ? 10 : 20);
  }


  @Override
  public void paintInstance(InstancePainter painter) {
    Graphics g = painter.getGraphics();
    Bounds bds = painter.getBounds();
    Direction facing = painter.getAttributeValue(StdAttr.FACING);
    BitWidth select = painter.getAttributeValue(Plexers.ATTR_SELECT);
    boolean enable = painter.getAttributeValue(Plexers.ATTR_ENABLE).booleanValue();
    int outputs = 1 << select.getWidth();


    // draw select and enable inputs
    GraphicsUtil.switchToWidth(g, 3);
    boolean vertical = facing == Direction.NORTH || facing == Direction.SOUTH;
    Object selectLoc = painter.getAttributeValue(Plexers.ATTR_SELECT_LOC);
    int selMult = selectLoc == Plexers.SELECT_BOTTOM_LEFT ? 1 : -1;
    int dx = vertical ? selMult : 0;
    int dy = vertical ? 0 : -selMult;
    if (outputs == 2) { // draw select wire
      Location sel = painter.getInstance().getPortLocation(outputs);
      if (painter.getShowState()) {
        g.setColor(painter.getPort(outputs).getColor());
      }
      g.drawLine(sel.getX(), sel.getY(), sel.getX() + 2 * dx, sel.getY() + 2 * dy);
    }
    if (enable) {
      Location en = painter.getInstance().getPortLocation(outputs + 1);
      if (painter.getShowState()) {
        g.setColor(painter.getPort(outputs + 1).getColor());
      }
      int len = outputs == 2 ? 6 : 4;
      g.drawLine(en.getX(), en.getY(), en.getX() + len * dx, en.getY() + len * dy);
    }
    GraphicsUtil.switchToWidth(g, 1);
    
    // draw a circle indicating where the select input is located
    Multiplexer.drawSelectCircle(g, bds, painter.getInstance().getPortLocation(outputs));


    // draw "0" next to first input
    int x0;
    int y0;
    int halign;
    if (facing == Direction.WEST) {
      x0 = 3;
      y0 = 15;
      halign = GraphicsUtil.H_LEFT;
    } else if (facing == Direction.NORTH) {
      x0 = 10;
      y0 = 15;
      halign = GraphicsUtil.H_CENTER;
    } else if (facing == Direction.SOUTH) {
      x0 = 10;
      y0 = bds.getHeight() - 3;
      halign = GraphicsUtil.H_CENTER;
    } else {
      x0 = bds.getWidth() - 3;
      y0 = 15;
      halign = GraphicsUtil.H_RIGHT;
    }
    g.setColor(Color.GRAY);
    GraphicsUtil.drawText(g, "0", bds.getX() + x0, bds.getY() + y0,
        halign, GraphicsUtil.V_BASELINE);


    // draw trapezoid, "DMX" label, and ports
    g.setColor(Color.BLACK);
    Plexers.drawTrapezoid(g, bds, facing.reverse(), select.getWidth() == 1 ? 10 : 20);
    GraphicsUtil.drawCenteredText(g, "DMX",
        bds.getX() + bds.getWidth() / 2,
        bds.getY() + bds.getHeight() / 2);
    painter.drawPorts();

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