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


public class LineMetricsImplRTest extends TestCase {
    
    public void testGetLineMetrics() {
            Font font = new Font("Dialog", Font.PLAIN, 12);
            FontRenderContext frc = new FontRenderContext(null, false, false);
            final int count = 100;
        try {
            for (int i = 0; i < count; i++) {
                LineMetrics lm = font.getLineMetrics("", frc);
            }

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  {
    super.setFont(font);


    if (renderNamesVertically)
    {
      final Rectangle2D bounds = font.getStringBounds("100%", new FontRenderContext(null, true, true));
      this.padding = bounds.getWidth() - bounds.getHeight();
    }
    else
    {
      final Rectangle2D bounds = font.getStringBounds("xxxPage Headerxxx", new FontRenderContext(null, true, true)); // NON-NLS
      this.padding = bounds.getWidth();
    }
  }

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    }
  }


  private void drawRotatedText(final Graphics2D g2d, final int x, final int y, final String text)
  {
    final FontRenderContext fontRenderContext = g2d.getFontRenderContext();
    final Font font = getFont();
    final Rectangle2D sb = font.getStringBounds(text, fontRenderContext);
    final int width = (int) sb.getWidth() + 4;


    final LineMetrics lineMetrics = font.getLineMetrics(text, fontRenderContext);

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    g2d.setTransform(oldTransform);
  }


  private void drawText(final Graphics2D g2d, final int x, final int y, final String text)
  {
    final FontRenderContext fontRenderContext = g2d.getFontRenderContext();
    final Font font = getFont();
    final LineMetrics lineMetrics = font.getLineMetrics(text, fontRenderContext);
    final float ascent = lineMetrics.getAscent();
    g2d.setFont(font);
    g2d.setColor(getForeground());

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  private static ImageIcon createRotatedTextIcon(final Color foreground,
                                                 final int rotate,
                                                 final Font font,
                                                 final String text)
  {
    final FontRenderContext fontRenderContext = new FontRenderContext(null, false, false);
    final GlyphVector glyphs = font.createGlyphVector(fontRenderContext, text);
    final int width = (int) glyphs.getLogicalBounds().getWidth() + 4;
    //height = (int)glyphs.getLogicalBounds().getHeight();


    final LineMetrics lineMetrics = font.getLineMetrics(text, fontRenderContext);

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  }


  private FontRenderContext createFontRenderContext(final StyleSheet layoutContext)
  {
    final boolean antiAliasing = RenderUtility.isFontSmooth(layoutContext, getMetaData());
    return new FontRenderContext(null, antiAliasing, true);
  }

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  private LineBreakIterator createLineBreakIterator(final ParagraphRenderBox box,
                                                    final StyleSheet layoutContext,
                                                    final RichTextSpec richText)
  {
    final AttributedCharacterIterator ci = richText.createAttributedCharacterIterator();
    final FontRenderContext fontRenderContext = createFontRenderContext(layoutContext);
    final boolean breakOnWordBoundary = strictCompatibility ||
        layoutContext.getBooleanStyleProperty(TextStyleKeys.WORDBREAK);


    if (breakOnWordBoundary)
    {

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                               final ParagraphPoolBox lineBoxContainer,
                               final StyleSheet layoutContext)
  {
    RichTextSpec richText = RichTextSpecProducer.compute(lineBoxContainer, metaData, resourceManager);


    final FontRenderContext fontRenderContext = createFontRenderContext(layoutContext);
    final TextLayout textLayout = new TextLayout(richText.createAttributedCharacterIterator(), fontRenderContext);
    double height = textLayout.getAscent() + textLayout.getDescent() + textLayout.getLeading();


    final RenderableComplexText text = richText.create(lineBoxContainer);
    text.setTextLayout(textLayout);

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  {
    final boolean antialias = RenderingHints.VALUE_TEXT_ANTIALIAS_ON.equals(getRenderingHint(
        RenderingHints.KEY_TEXT_ANTIALIASING));
    final boolean fractions = RenderingHints.VALUE_FRACTIONALMETRICS_ON.equals(getRenderingHint(
        RenderingHints.KEY_FRACTIONALMETRICS));
    return new FontRenderContext(new AffineTransform(), antialias, fractions);
  }

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    }
    g2.translate(-x, -y);
    x += b.getWidth() / 2.0 + 3.0;
    g2.setFont(this.font);


    final FontRenderContext frc = g2.getFontRenderContext();
    final Font f = g2.getFont();
//    final FontMetrics fm = g2.getFontMetrics(f);
    final LineMetrics metrics = f.getLineMetrics(label, frc);
    final float ascent = metrics.getAscent();
    final float halfAscent = ascent / 2.0f;

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