java.awt.FontMetrics#getHeight ( )源码实例Demo

@Override
public Dimension getPreferredSize(JComponent c) {
    int prefHeight = 28;
    //Never call getGraphics() on the control, it resets in-process
    //painting on OS-X 1.4.1 and triggers gratuitous repaints
    Graphics g = BasicScrollingTabDisplayerUI.getOffscreenGraphics();
    if (g != null) {
        FontMetrics fm = g.getFontMetrics(displayer.getFont());
        Insets ins = getTabAreaInsets();
        prefHeight = fm.getHeight() + ins.top + ins.bottom + 7;
    }
    if (prefHeight % 2 == 0) {
        prefHeight += 1;
    }
    return new Dimension(displayer.getWidth(), prefHeight);
}
 

/**
		 * Compute height.
		 *
		 * @return the int
		 */
		private int computeHeight()
		{
			FontMetrics fm = rootPane.getFontMetrics(getFont());
			int fontHeight = fm.getHeight();
			fontHeight += 7;
			int iconHeight = 0;
			if (getWindowDecorationStyle() == JRootPane.FRAME)
//					||getWindowDecorationStyle() == JRootPane.PLAIN_DIALOG)//
			{
				iconHeight = IMAGE_HEIGHT;
			}

			int finalHeight = Math.max(fontHeight, iconHeight);
			return finalHeight+2;//* 改变此处的返回结果将直接改变窗口标题的高度哦
		}
 

protected void measure()
{
    final FontMetrics fm = this.getFontMetrics( this.getFont() );
    // If we don't have font metrics yet, just return.
    if (fm == null) return;
    
    line_height = fm.getHeight();
    line_ascent = fm.getAscent();
    max_width = 0;
    
    for( int i = 0; i < num_lines; i++ )
    {
        line_widths[ i ] = fm.stringWidth( lines[ i ] );
        if ( line_widths[ i ] > max_width )
        	max_width = line_widths[i];
    }
}
 

private void drawScaleLine2(Graphics2D g, long breakWidth, long geoBreakWidth) {
    FontMetrics metrics = g.getFontMetrics(_font);
    float fontHeight = metrics.getHeight();
    float leftStart = metrics.stringWidth(String.valueOf(Math.abs(geoBreakWidth))) / 2F;
    int yShift = 5;

    g.setColor(this.getForeground());
    g.setStroke(new BasicStroke(this.lineWidth));
    g.draw(new Line2D.Float(leftStart, fontHeight * 1.6f + yShift, leftStart + (breakWidth * _numBreaks), fontHeight * 1.6f + yShift));
    g.setFont(this._font);
    for (int i = 0; i <= _numBreaks; i++) {
        g.draw(new Line2D.Float(leftStart, fontHeight * 1.1f + yShift, leftStart, fontHeight + (fontHeight * 1.1f) + yShift));
        g.drawString(String.valueOf(Math.abs(geoBreakWidth * i)),
                leftStart - (metrics.stringWidth(String.valueOf(Math.abs(geoBreakWidth * i))) / 2), yShift * _yShiftScale);
        leftStart = leftStart + breakWidth;
    }
    g.drawString(_unitText, leftStart - breakWidth + (fontHeight / 2), fontHeight * 1.1f + yShift * _yShiftScale);
}
 

/**
 * Called when a mouse button is pressed.
 */
public void mousePressed(MouseEvent e) {
    Font font = fileWindow.textArea.getFont();
    FontMetrics metrics = getFontMetrics(font);
    int h = metrics.getHeight();
    pressLine = e.getY() / h;
}
 

private BufferedImage getSplat(int id, int damage)
{
	//Get a copy of the hitsplat to get a clean one each time
	final BufferedImage rawSplat = spriteManager.getSprite(id, 0);
	if (rawSplat == null)
	{
		return null;
	}

	final BufferedImage splat = new BufferedImage(
		rawSplat.getColorModel(),
		rawSplat.copyData(null),
		rawSplat.getColorModel().isAlphaPremultiplied(),
		null);

	final Graphics g = splat.getGraphics();
	g.setFont(FontManager.getRunescapeSmallFont());

	// Align the text in the centre of the hitsplat
	final FontMetrics metrics = g.getFontMetrics();
	final String text = String.valueOf(damage);
	final int x = (splat.getWidth() - metrics.stringWidth(text)) / 2;
	final int y = (splat.getHeight() - metrics.getHeight()) / 2 + metrics.getAscent();

	g.setColor(Color.BLACK);
	g.drawString(String.valueOf(damage), x + 1, y + 1);
	g.setColor(Color.WHITE);
	g.drawString(String.valueOf(damage), x, y);
	return splat;
}
 

public void paint(Graphics g, JComponent c) {
     FontMetrics metrics = g.getFontMetrics();
     Dimension size = c.getSize();
     g.setColor(c.getBackground());
     g.fillRect(0, 0, size.width, size.height);
     g.setColor(c.getForeground());
     int y = metrics.getAscent() + 1;
     int h = metrics.getHeight();
     if(lines != null)
for (int i = 0; i < lines.length; i++) {
  g.drawString(lines[i], 3, y);
  y += h;
}
   }
 

/**
 * Evaluates the preferred size for the TextPane.
 *
 * @return a Dimension with the preferred TextPane dimensions.
 */
private Dimension calculateTextPaneSize() {
  FontMetrics fontMetrics = getFontMetrics(FONT);
  int width = fontMetrics.charWidth(' ') * (COLUMNS + 1); // Add a padding column.
  int height = fontMetrics.getHeight() * ROWS;
  return new Dimension(width, height);
}
 

double height(Tree<String> tree, FontMetrics fM) {
	if (tree == null) {
		return 0.0;
	}
	double depth = tree.getDepth();
	// double f = fM.getHeight() ;
	return fM.getHeight()
			* (depth * (1.0 + parentSkip + aboveLineSkip + belowLineSkip) - parentSkip);
}
 

/**
 * Paints info message about the game.
 * @param g2 graphics context in which to paint
 */
private void paintInfo( final Graphics2D g2 ) {
	g2.setFont( g2.getFont().deriveFont( Font.BOLD, 22 ) );
	final FontMetrics fontMetrics = g2.getFontMetrics();
	final int textsCount = 5;
	final int lineHeight = fontMetrics.getHeight() << 1;
	int y = ( ( Consts.HEIGHT - textsCount * lineHeight ) >> 1 ) + fontMetrics.getAscent();
	
	g2.setColor( Color.LIGHT_GRAY );
	for ( int i = 1; i <= textsCount; i++, y += lineHeight ) {
		final String text = Language.getText( "mousePracticeGame.info" + i );
		g2.drawString( text, ( Consts.WIDTH - fontMetrics.stringWidth( text ) ) >> 1, y );
	}
}
 

/** Measure text
 *  @param gc AWT Graphics context. Font must be set.
 *  @param text Text to measure, may be multi-line.
 *  @return Rectangle where (x, y) is the offset from the top-left
 *          corner of the text to its baseline as used for gc.drawString(),
 *          and (width, height) are the overall bounding box.
 */
public static Rectangle measureText(final Graphics2D gc, final String text)
{
	final FontMetrics metrics = gc.getFontMetrics();
	final Rectangle info = new Rectangle(0, metrics.getLeading() + metrics.getAscent(), 0, 0);
    for (String line : text.split("\n"))
    {
        final int width = metrics.stringWidth(line);
        if (width > info.width)
            info.width = width;
        info.height += metrics.getHeight();
    }
	return info;
}
 

/**
    * Call this function to determine if the point at x,y is on the unit.
    * @param g The graphics context for font size info.
    * @param x The x coord.
    * @param y The y coord.
    * @param w The width of the display.
    * @param h The height of the display.
    * @return True if the point is on the unit, false otherwise.
    */
   public boolean onUnit(Graphics g, int x, int y, int w, int h) {
     
     FontMetrics fm = g.getFontMetrics();
     int l = (int)(m_x * w) - fm.stringWidth(m_id) / 2;
     int t = (int)(m_y * h) - fm.getHeight() / 2;
     if (x < l || x > l + fm.stringWidth(m_id) + 4 
  || y < t || y > t + fm.getHeight() + fm.getDescent() + 4) {
return false;
     }
     return true;
     
   }
 

private void computeLineY(FontMetrics fm) {
	lineY = new int[lineNots.size()];
	int curY = 0;
	for (int i = 0; i < lineY.length; i++) {
		int maxDepth = -1;
		ArrayList<NotData> nots = lineNots.get(i);
		for (NotData nd : nots) {
			if (nd.depth > maxDepth)
				maxDepth = nd.depth;
		}
		lineY[i] = curY + maxDepth * NOT_SEP;
		curY = lineY[i] + fm.getHeight() + EXTRA_LEADING;
	}
	height = Math.max(MINIMUM_HEIGHT, curY - fm.getLeading() - EXTRA_LEADING);
}
 

private static void drawColumnLabel(Graphics2D graphics, FontMetrics metrics, String text, int yCenter, int[] drawRange, int xRight, boolean updateMin, boolean centeredOnly) {
    // If the center is not in the range, don't draw anything
    if (drawRange[MAX] < yCenter || drawRange[MIN] > yCenter)
        return;

    // If there is no space, don't draw anything
    if (drawRange[MAX] - drawRange[MIN] < metrics.getHeight())
        return;

    Java2DStringUtilities.Alignment alignment = Java2DStringUtilities.Alignment.RIGHT;
    int targetY = yCenter;
    int halfHeight = metrics.getAscent() / 2;
    if (yCenter < drawRange[MIN] + halfHeight) {
        // Can't be drawn in the center
        if (centeredOnly)
            return;
        alignment = Java2DStringUtilities.Alignment.TOP_RIGHT;
        targetY = drawRange[MIN];
    } else if (yCenter > drawRange[MAX] - halfHeight) {
        // Can't be drawn in the center
        if (centeredOnly)
            return;
        alignment = Java2DStringUtilities.Alignment.BOTTOM_RIGHT;
        targetY = drawRange[MAX];
    }

    Java2DStringUtilities.drawString(graphics, alignment, xRight, targetY, text);

    if (updateMin) {
        drawRange[MAX] = targetY - metrics.getHeight();
    } else {
        drawRange[MIN] = targetY + metrics.getHeight();
    }
}
 

/**
 * Paints the border for the specified component with the
 * specified position and size.
 * @param c the component for which this border is being painted
 * @param g the paint graphics
 * @param x the x position of the painted border
 * @param y the y position of the painted border
 * @param width the width of the painted border
 * @param height the height of the painted border
 */
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
    if (!(c instanceof JPopupMenu)) {
        return;
    }

    Font origFont = g.getFont();
    Color origColor = g.getColor();
    JPopupMenu popup = (JPopupMenu)c;

    String title = popup.getLabel();
    if (title == null) {
        return;
    }

    g.setFont(font);

    FontMetrics fm = SwingUtilities2.getFontMetrics(popup, g, font);
    int         fontHeight = fm.getHeight();
    int         descent = fm.getDescent();
    int         ascent = fm.getAscent();
    Point       textLoc = new Point();
    int         stringWidth = SwingUtilities2.stringWidth(popup, fm,
                                                          title);

    textLoc.y = y + ascent + TEXT_SPACING;
    textLoc.x = x + ((width - stringWidth) / 2);

    g.setColor(background);
    g.fillRect(textLoc.x - TEXT_SPACING, textLoc.y - (fontHeight-descent),
               stringWidth + (2 * TEXT_SPACING), fontHeight - descent);
    g.setColor(foreground);
    SwingUtilities2.drawString(popup, g, title, textLoc.x, textLoc.y);

    MotifGraphicsUtils.drawGroove(g, x, textLoc.y + TEXT_SPACING,
                                  width, GROOVE_HEIGHT,
                                  shadowColor, highlightColor);

    g.setFont(origFont);
    g.setColor(origColor);
}
 

public static String getCaptcha(HttpServletRequest request, HttpServletResponse response) {
    try {
        Delegator delegator = (Delegator) request.getAttribute("delegator");
        final String captchaSizeConfigName = StringUtils.defaultIfEmpty(request.getParameter("captchaSize"), "default");
        final String captchaSizeConfig = EntityUtilProperties.getPropertyValue("captcha", "captcha." + captchaSizeConfigName, delegator);
        final String[] captchaSizeConfigs = captchaSizeConfig.split("\\|");
        final String captchaCodeId = StringUtils.defaultIfEmpty(request.getParameter("captchaCodeId"), ""); // this is used to uniquely identify in the user session the attribute where the captcha code for the last captcha for the form is stored

        final int fontSize = Integer.parseInt(captchaSizeConfigs[0]);
        final int height = Integer.parseInt(captchaSizeConfigs[1]);
        final int width = Integer.parseInt(captchaSizeConfigs[2]);
        final int charsToPrint = UtilProperties.getPropertyAsInteger("captcha", "captcha.code_length", 6);
        final char[] availableChars = EntityUtilProperties.getPropertyValue("captcha", "captcha.characters", delegator).toCharArray();

        //It is possible to pass the font size, image width and height with the request as well
        Color backgroundColor = Color.gray;
        Color borderColor = Color.DARK_GRAY;
        Color textColor = Color.ORANGE;
        Color circleColor = new Color(160, 160, 160);
        Font textFont = new Font("Arial", Font.PLAIN, fontSize);
        int circlesToDraw = 6;
        float horizMargin = 20.0f;
        double rotationRange = 0.7; // in radians
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        Graphics2D g = (Graphics2D) bufferedImage.getGraphics();

        g.setColor(backgroundColor);
        g.fillRect(0, 0, width, height);

        //Generating some circles for background noise
        g.setColor(circleColor);
        for (int i = 0; i < circlesToDraw; i++) {
            int circleRadius = (int) (Math.random() * height / 2.0);
            int circleX = (int) (Math.random() * width - circleRadius);
            int circleY = (int) (Math.random() * height - circleRadius);
            g.drawOval(circleX, circleY, circleRadius * 2, circleRadius * 2);
        }
        g.setColor(textColor);
        g.setFont(textFont);

        FontMetrics fontMetrics = g.getFontMetrics();
        int maxAdvance = fontMetrics.getMaxAdvance();
        int fontHeight = fontMetrics.getHeight();

        String captchaCode = RandomStringUtils.random(6, availableChars);

        float spaceForLetters = -horizMargin * 2 + width;
        float spacePerChar = spaceForLetters / (charsToPrint - 1.0f);

        for (int i = 0; i < captchaCode.length(); i++) {

            // this is a separate canvas used for the character so that
            // we can rotate it independently
            int charWidth = fontMetrics.charWidth(captchaCode.charAt(i));
            int charDim = Math.max(maxAdvance, fontHeight);
            int halfCharDim = (charDim / 2);

            BufferedImage charImage = new BufferedImage(charDim, charDim, BufferedImage.TYPE_INT_ARGB);
            Graphics2D charGraphics = charImage.createGraphics();
            charGraphics.translate(halfCharDim, halfCharDim);
            double angle = (Math.random() - 0.5) * rotationRange;
            charGraphics.transform(AffineTransform.getRotateInstance(angle));
            charGraphics.translate(-halfCharDim, -halfCharDim);
            charGraphics.setColor(textColor);
            charGraphics.setFont(textFont);

            int charX = (int) (0.5 * charDim - 0.5 * charWidth);
            charGraphics.drawString("" + captchaCode.charAt(i), charX,
                    ((charDim - fontMetrics.getAscent()) / 2 + fontMetrics.getAscent()));

            float x = horizMargin + spacePerChar * (i) - charDim / 2.0f;
            int y = ((height - charDim) / 2);

            g.drawImage(charImage, (int) x, y, charDim, charDim, null, null);

            charGraphics.dispose();
        }
        // Drawing the image border
        g.setColor(borderColor);
        g.drawRect(0, 0, width - 1, height - 1);
        g.dispose();
        response.setContentType("image/jpeg");
        ImageIO.write(bufferedImage, "jpg", response.getOutputStream());
        HttpSession session = request.getSession();
        Map<String, String> captchaCodeMap = UtilGenerics.checkMap(session.getAttribute("_CAPTCHA_CODE_"));
        if (captchaCodeMap == null) {
            captchaCodeMap = new HashMap<>();
            session.setAttribute("_CAPTCHA_CODE_", captchaCodeMap);
        }
        captchaCodeMap.put(captchaCodeId, captchaCode);
    } catch (IOException | IllegalArgumentException | IllegalStateException ioe) {
        Debug.logError(ioe.getMessage(), module);
    }
    return "success";
}
 

public int getBaseline(int w, int h) {
    FontMetrics fm = getFontMetrics(getFont());
    return h - fm.getDescent() - ((h - fm.getHeight()) / 2);
}
 

/**
 * Presents the Exceptions if the chart cannot be displayed properly.
 * 
 * @param g2d
 * @param ex
 */
private final void showException( Graphics2D g2d, Exception ex )
{
	String sWrappedException = ex.getClass( ).getName( );
	Throwable th = ex;
	while ( ex.getCause( ) != null )
	{
		ex = (Exception) ex.getCause( );
	}
	String sException = ex.getClass( ).getName( );
	if ( sWrappedException.equals( sException ) )
	{
		sWrappedException = null;
	}

	String sMessage = null;
	if ( th instanceof BirtException )
	{
		sMessage = ( (BirtException) th ).getLocalizedMessage( );
	}
	else
	{
		sMessage = ex.getMessage( );
	}

	if ( sMessage == null )
	{
		sMessage = "<null>";//$NON-NLS-1$
	}

	StackTraceElement[] stea = ex.getStackTrace( );
	Dimension d = getSize( );

	Font fo = new Font( "Monospaced", Font.BOLD, 14 );//$NON-NLS-1$
	g2d.setFont( fo );
	FontMetrics fm = g2d.getFontMetrics( );
	g2d.setColor( Color.WHITE );
	g2d.fillRect( 20, 20, d.width - 40, d.height - 40 );
	g2d.setColor( Color.BLACK );
	g2d.drawRect( 20, 20, d.width - 40, d.height - 40 );
	g2d.setClip( 20, 20, d.width - 40, d.height - 40 );
	int x = 25, y = 20 + fm.getHeight( );
	g2d.drawString( "Exception:", x, y );//$NON-NLS-1$
	x += fm.stringWidth( "Exception:" ) + 5;//$NON-NLS-1$
	g2d.setColor( Color.RED );
	g2d.drawString( sException, x, y );
	x = 25;
	y += fm.getHeight( );
	if ( sWrappedException != null )
	{
		g2d.setColor( Color.BLACK );
		g2d.drawString( "Wrapped In:", x, y );//$NON-NLS-1$
		x += fm.stringWidth( "Wrapped In:" ) + 5;//$NON-NLS-1$
		g2d.setColor( Color.RED );
		g2d.drawString( sWrappedException, x, y );
		x = 25;
		y += fm.getHeight( );
	}
	g2d.setColor( Color.BLACK );
	y += 10;
	g2d.drawString( "Message:", x, y );//$NON-NLS-1$
	x += fm.stringWidth( "Message:" ) + 5;//$NON-NLS-1$
	g2d.setColor( Color.BLUE );
	g2d.drawString( sMessage, x, y );
	x = 25;
	y += fm.getHeight( );
	g2d.setColor( Color.BLACK );
	y += 10;
	g2d.drawString( "Trace:", x, y );//$NON-NLS-1$
	x = 40;
	y += fm.getHeight( );
	g2d.setColor( Color.GREEN.darker( ) );
	for ( int i = 0; i < stea.length; i++ )
	{
		g2d.drawString( stea[i].getClassName( ) + ":"//$NON-NLS-1$
				+ stea[i].getMethodName( ) + "(...):"//$NON-NLS-1$
				+ stea[i].getLineNumber( ), x, y );
		x = 40;
		y += fm.getHeight( );
	}
}
 

double paintTree(Tree<String> t, Point2D start, Graphics2D g2,
		FontMetrics fM) {
	if (t == null) {
		return 0.0;
	}
	String nodeStr = nodeToString(t);
	double nodeWidth = fM.stringWidth(nodeStr);
	double nodeHeight = fM.getHeight();
	double nodeAscent = fM.getAscent();
	WidthResult wr = widthResult(t, fM);
	double treeWidth = wr.width;
	double nodeTab = wr.nodeTab;
	double childTab = wr.childTab;
	double nodeCenter = wr.nodeCenter;
	// draw root
	g2.drawString(nodeStr, (float) (nodeTab + start.getX()),
			(float) (start.getY() + nodeAscent));
	if (t.isLeaf()) {
		return nodeWidth;
	}
	double layerMultiplier = (1.0 + belowLineSkip + aboveLineSkip + parentSkip);
	double layerHeight = nodeHeight * layerMultiplier;
	double childStartX = start.getX() + childTab;
	double childStartY = start.getY() + layerHeight;
	double lineStartX = start.getX() + nodeCenter;
	double lineStartY = start.getY() + nodeHeight * (1.0 + belowLineSkip);
	double lineEndY = lineStartY + nodeHeight * parentSkip;
	// recursively draw children
	for (int i = 0; i < t.getChildren().size(); i++) {
		Tree<String> child = t.getChildren().get(i);
		double cWidth = paintTree(child, new Point2D.Double(childStartX,
				childStartY), g2, fM);
		// draw connectors
		wr = widthResult(child, fM);
		double lineEndX = childStartX + wr.nodeCenter;
		g2.draw(new Line2D.Double(lineStartX, lineStartY, lineEndX,
				lineEndY));
		childStartX += cWidth;
		if (i < t.getChildren().size() - 1) {
			childStartX += sisterSkip * fM.stringWidth(" ");
		}
	}
	return treeWidth;
}
 

/**
 * Returns the bounds for the specified text when it is drawn with the 
 * left-baseline aligned to the point <code>(x, y)</code>.
 * 
 * @param text  the text (<code>null</code> not permitted).
 * @param x  the x-coordinate.
 * @param y  the y-coordinate.
 * @param fm  the font metrics (<code>null</code> not permitted).
 * 
 * @return The bounding rectangle (never <code>null</code>). 
 */
public static Rectangle2D getTextBounds(String text, double x, double y,
        FontMetrics fm) {
    ParamChecks.nullNotPermitted(text, "text");
    ParamChecks.nullNotPermitted(fm, "fm");
    double width = fm.stringWidth(text);
    double height = fm.getHeight();
    return new Rectangle2D.Double(x, y - fm.getAscent(), width, height);
    
}