Examples of java.awt.font.FontRenderContext

java.awt.font.FontRenderContext
The FontRenderContext class is a container for the information needed to correctly measure text. The measurement of text can vary because of rules that map outlines to pixels, and rendering hints provided by an application.
One such piece of information is a transform that scales typographical points to pixels. (A point is defined to be exactly 1/72 of an inch, which is slightly different than the traditional mechanical measurement of a point.) A character that is rendered at 12pt on a 600dpi device might have a different size than the same character rendered at 12pt on a 72dpi device because of such factors as rounding to pixel boundaries and hints that the font designer may have specified.
Anti-aliasing and Fractional-metrics specified by an application can also affect the size of a character because of rounding to pixel boundaries.
Typically, instances of FontRenderContext are obtained from a {@link java.awt.Graphics2D Graphics2D} object. AFontRenderContext which is directly constructed will most likely not represent any actual graphics device, and may lead to unexpected or incorrect results.
@see java.awt.RenderingHints#KEY_TEXT_ANTIALIASING @see java.awt.RenderingHints#KEY_FRACTIONALMETRICS @see java.awt.Graphics2D#getFontRenderContext() @see java.awt.font.LineMetrics


  /**
   * Updates the labels path by drawing the labels of the X/Y-axis.
   */
  protected void updatePathLabels(final double gapx, final double gapy) {
    final FontRenderContext frc = new FontRenderContext(null, true, true);
    final PlottingStyle labelsDisplay = shape.getLabelsDisplayed();
    final PlottingStyle ticksDisplay = shape.getTicksDisplayed();
    final TicksStyle ticksStyle = shape.getTicksStyle();


    if(labelsDisplay.isX())

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    private static float[] deriveTextBoundsAnchorOffsets(final Graphics2D g2,
            final String text, final TextAnchor anchor,
            final Rectangle2D textBounds) {


        final float[] result = new float[3];
        final FontRenderContext frc = g2.getFontRenderContext();
        final Font f = g2.getFont();
        final FontMetrics fm = g2.getFontMetrics(f);
        final Rectangle2D bounds = TextUtilities.getTextBounds(text, g2, fm);
        final LineMetrics metrics = f.getLineMetrics(text, frc);
        final float ascent = metrics.getAscent();

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     */
    private static float[] deriveTextBoundsAnchorOffsets(final Graphics2D g2,
            final String text, final TextAnchor anchor) {


        final float[] result = new float[2];
        final FontRenderContext frc = g2.getFontRenderContext();
        final Font f = g2.getFont();
        final FontMetrics fm = g2.getFontMetrics(f);
        final Rectangle2D bounds = TextUtilities.getTextBounds(text, g2, fm);
        final LineMetrics metrics = f.getLineMetrics(text, frc);
        final float ascent = metrics.getAscent();

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     */
    private static float[] deriveRotationAnchorOffsets(final Graphics2D g2,
            final String text, final TextAnchor anchor) {


        final float[] result = new float[2];
        final FontRenderContext frc = g2.getFontRenderContext();
        final LineMetrics metrics = g2.getFont().getLineMetrics(text, frc);
        final FontMetrics fm = g2.getFontMetrics();
        final Rectangle2D bounds = TextUtilities.getTextBounds(text, g2, fm);
        final float ascent = metrics.getAscent();
        final float halfAscent = ascent / 2.0f;

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      int requiredHeight = req.getParam("height").compareTo("") != 0 ? Integer.parseInt(req.getParam("height").endsWith("px")?req.getParam("height").substring(0, req.getParam("height").length()-2):req.getParam("height")) : DEFAULT_HEIGHT;
      // This is the image we are making
      BufferedImage buffer = new BufferedImage(requiredWidth, requiredHeight, BufferedImage.TYPE_INT_RGB);
      Graphics2D g2 = buffer.createGraphics();
      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
      FontRenderContext fc = g2.getFontRenderContext();
      // We then specify the maximum font size that fits in the image
      // For this, we start at 1, and increase it, until it overflows. This-1 will be the font size
      float size = 1;
      g2.setFont(g2.getFont().deriveFont(size));
      int width = 0;

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    private WrappedLines breakLines(Graphics2D g) {
      Dimension size = label.getSize();
      float maxWidth = size.width;
      AttributedString attributedText = new AttributedString(label.getText(), textAttributes());
      AttributedCharacterIterator textIterator = attributedText.getIterator();
      FontRenderContext fontRendering = g.getFontRenderContext();
      LineBreakMeasurer measurer = new LineBreakMeasurer(textIterator, fontRendering);
      WrappedLines lines = new WrappedLines();
      while(measurer.getPosition() < textIterator.getEndIndex()) {
        TextLayout layout = measurer.nextLayout(maxWidth);
        lines.add(layout);

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    Graphics2D graphics = image.createGraphics();
    try {
      graphics.setFont(font);
      graphics.setRenderingHint(KEY_TEXT_ANTIALIASING, VALUE_TEXT_ANTIALIAS_ON);
      
      FontRenderContext context = graphics.getFontRenderContext();
      TextLayout layout = new TextLayout(text, font, context);
      int x = width / 2 - (int) (layout.getAdvance() / 2f);
      int y = height / 2 + (int) (layout.getAscent() / 2f) - 1;
      
      graphics.setColor(Color.DARK_GRAY.darker());

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          JTextArea consHelpTextArea = new JTextArea();
          consHelpFrame.setLocation(xloc, yloc);
          consHelpFrame.add(consHelpPanel);
          consHelpFrame.setVisible(true);
          Graphics2D gc = (Graphics2D) consHelpPanel.getGraphics();
         FontRenderContext context = gc.getFontRenderContext();
           Rectangle2D bounds = df.getStringBounds(" ", context);
          int mwidth =(int) bounds.getWidth()*150;
          int mheight =(int) bounds.getHeight()*20;
         
           consHelpFrame.setSize(mwidth, mheight);

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  public TextConsole(int width, int height, int fontSize, String fontName) {
    font = new Font(fontName, Font.BOLD, fontSize);
    widthChars = width;
    heightChars = height;
    setFont(font);
    FontRenderContext fontRenderContext = new FontRenderContext(null, true,
        true);
    Rectangle2D stringBounds = font.getStringBounds(new char[] { 'l' }, 0,
        1, fontRenderContext);
    setPreferredSize(new Dimension(
        (int) ((widthChars + 1) * stringBounds.getWidth()),

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      double shearX = rng.nextDouble() * 0.2;
      double shearY = rng.nextDouble() * 0.2;
      CharAttributes cf = new CharAttributes(ch, fontName, rotation, rise, shearX, shearY);
      charAttsList.add(cf);
      text = new TextLayout(ch + "", getFont(fontName), new FontRenderContext(null, false,
        false));
      textAt = new AffineTransform();
      textAt.rotate(rotation);
      textAt.shear(shearX, shearY);
      shape = text.getOutline(textAt);

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