Examples of java.awt.font.GlyphVector

java.awt.font.GlyphVector
A GlyphVector object is a collection of glyphs containing geometric information for the placement of each glyph in a transformed coordinate space which corresponds to the device on which the GlyphVector is ultimately displayed.
The GlyphVector does not attempt any interpretation of the sequence of glyphs it contains. Relationships between adjacent glyphs in sequence are solely used to determine the placement of the glyphs in the visual coordinate space.
Instances of GlyphVector are created by a {@link Font}.
In a text processing application that can cache intermediate representations of text, creation and subsequent caching of a GlyphVector for use during rendering is the fastest method to present the visual representation of characters to a user.
A GlyphVector is associated with exactly one Font, and can provide data useful only in relation to this Font. In addition, metrics obtained from a GlyphVector are not generally geometrically scaleable since the pixelization and spacing are dependent on grid-fitting algorithms within a Font. To facilitate accurate measurement of a GlyphVector and its component glyphs, you must specify a scaling transform, anti-alias mode, and fractional metrics mode when creating the GlyphVector. These characteristics can be derived from the destination device.
For each glyph in the GlyphVector, you can obtain:
- the position of the glyph
- the transform associated with the glyph
- the metrics of the glyph in the context of the GlyphVector. The metrics of the glyph may be different under different transforms, application specified rendering hints, and the specific instance of the glyph within the GlyphVector.
Altering the data used to create the GlyphVector does not alter the state of the GlyphVector.
Methods are provided to adjust the positions of the glyphs within the GlyphVector. These methods are most appropriate for applications that are performing justification operations for the presentation of the glyphs.
Methods are provided to transform individual glyphs within the GlyphVector. These methods are primarily useful for special effects.
Methods are provided to return both the visual, logical, and pixel bounds of the entire GlyphVector or of individual glyphs within the GlyphVector.
Methods are provided to return a {@link Shape} for the GlyphVector, and for individual glyphs within the GlyphVector. @see Font @see GlyphMetrics @see TextLayout @version 19 Mar 1998 @author Charlton Innovations, Inc.


    private void appendLine(CharSequence characters, int start, int end,
        Font font, FontRenderContext fontRenderContext) {
        CharSequenceCharacterIterator line = new CharSequenceCharacterIterator(characters,
            start, end, start);
        GlyphVector glyphVector = font.createGlyphVector(fontRenderContext, line);
        rows.add(new Row(glyphVector, start));


        Rectangle2D textBounds = glyphVector.getLogicalBounds();
        width = Math.max(width, (float)textBounds.getWidth());
        height += textBounds.getHeight();
    }

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        this.font = font;


        int missingGlyphCode = font.getMissingGlyphCode();
        FontRenderContext fontRenderContext = Platform.getFontRenderContext();


        GlyphVector missingGlyphVector = font.createGlyphVector(fontRenderContext,
            new int[] {missingGlyphCode});
        Rectangle2D textBounds = missingGlyphVector.getLogicalBounds();


        Rectangle2D maxCharBounds = font.getMaxCharBounds(fontRenderContext);
        averageCharacterSize = new Dimensions((int)Math.ceil(textBounds.getWidth()),
            (int)Math.ceil(maxCharBounds.getHeight()));

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                false, false);


        // Only a single line
        if (_string.indexOf('\n') < 0) {
            // Get the shape
            GlyphVector gv = _font.createGlyphVector(frc, _string);
            _shape = gv.getOutline();


            // If the string is only whitespace, then the drawing stuff
            // won't work properly. So we set the bounding box to a special
            // value.
            if (_string.trim().equals("")) {
                _bounds = new Rectangle2D.Float(0.0f, 0.0f, 1.0f, 1.0f);
            } else {
                _bounds = _shape.getBounds2D();
            }
        } else {
            // Multiple lines, so generate a compound shape
            double dy = _font.getMaxCharBounds(frc).getHeight();
            StringTokenizer lines = new StringTokenizer(_string, "\n", true);
            _shape = null;


            int count = 0;


            while (lines.hasMoreTokens()) {
                String line = lines.nextToken();


                if (line.equals("\n")) {
                    // Note that leading or trailing newlines are ignored.
                    count++;
                } else if (!line.trim().equals("")) {
                    GlyphVector gv = _font.createGlyphVector(frc, line);
                    Shape s = gv.getOutline();


                    if (_shape == null) {
                        _shape = s;
                    } else {
                        // Translate each line and append to the previous shape

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    }


    @Override
    public Shape createStrokedShape( Shape shape ) {
        FontRenderContext frc = new FontRenderContext(null, true, true);
        GlyphVector glyphVector = font.createGlyphVector(frc, text);


        GeneralPath result = new GeneralPath();
        PathIterator it = new FlatteningPathIterator( shape.getPathIterator( null ), FLATNESS );
        float points[] = new float[6];
        float moveX = 0, moveY = 0;
        float lastX = 0, lastY = 0;
        float thisX = 0, thisY = 0;
        int type = 0;
        float next = 0;
        int currentChar = 0;
        int length = glyphVector.getNumGlyphs();


        if ( length == 0 )
            return result;


        float factor = stretchToFit ? measurePathLength( shape )/(float)glyphVector.getLogicalBounds().getWidth() : 1.0f;
        float nextAdvance = 0;


        while ( currentChar < length && !it.isDone() ) {
            type = it.currentSegment( points );
            switch( type ){
            case PathIterator.SEG_MOVETO:
                moveX = lastX = points[0];
                moveY = lastY = points[1];
                result.moveTo( moveX, moveY );
                nextAdvance = glyphVector.getGlyphMetrics( currentChar ).getAdvance() * 0.5f;
                next = nextAdvance;
                break;


            case PathIterator.SEG_CLOSE:
                points[0] = moveX;
                points[1] = moveY;
                // Fall into....


                //$FALL-THROUGH$
            case PathIterator.SEG_LINETO:
                thisX = points[0];
                thisY = points[1];
                float dx = thisX-lastX;
                float dy = thisY-lastY;
                float distance = (float)Math.sqrt( dx*dx + dy*dy );
                if ( distance >= next ) {
                    float r = 1.0f/distance;
                    float angle = (float)Math.atan2( dy, dx );
                    while ( currentChar < length && distance >= next ) {
                        Shape glyph = glyphVector.getGlyphOutline( currentChar );
                        Point2D p = glyphVector.getGlyphPosition(currentChar);
                        float px = (float)p.getX();
                        float py = (float)p.getY();
                        float x = lastX + next*dx*r;
                        float y = lastY + next*dy*r;
                        float advance = nextAdvance;
                        nextAdvance = currentChar < length-1 ? glyphVector.getGlyphMetrics(currentChar+1).getAdvance() * 0.5f : 0;
                        t.setToTranslation( x, y );
                        t.rotate( angle );
                        t.translate( -px-advance, -py );
                        result.append( t.createTransformedShape( glyph ), false );
                        next += (advance+nextAdvance) * factor;

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            if (line.equals("\n")) {
                // Note that leading or trailing newlines are ignored.
                y += dy;
            } else {
                GlyphVector gv = _font.createGlyphVector(frc, line);


                // Get the shape and bounds. Work around JDK1.4 bug.
                Shape s = gv.getOutline();
                Rectangle2D b;
                s = _transform.createTransformedShape(s);
                b = s.getBounds2D();


                if (_bounds == null) {

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    public void drawString( String string, int[] codePoints, Graphics g, float fontSize, 
            AffineTransform at, float x, float y ) throws IOException
    {
        Font awtFont = getawtFont();
        FontRenderContext frc = new FontRenderContext(new AffineTransform(), true, true);
        GlyphVector glyphs = null;
        boolean useCodepoints = codePoints != null && isType0Font();
        PDFont descendantFont = useCodepoints ? ((PDType0Font)this).getDescendantFont() : null;
        // symbolic fonts may trigger the same fontmanager.so/dll error as described below
        if (useCodepoints && !descendantFont.getFontDescriptor().isSymbolic())
        {

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     *
     ***************************************************************************/


    @Override
    public void drawString(AttributedCharacterIterator iterator, float x, float y) {
        GlyphVector gv = font.createGlyphVector(frc, iterator);
        drawGlyphVector(gv, x, y);
    }

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     *
     ***************************************************************************/


    @Override
    public void drawString(AttributedCharacterIterator iterator, float x, float y) {
        GlyphVector gv = font.createGlyphVector(frc, iterator);
        drawGlyphVector(gv, x, y);
    }

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                = domFactory.createElementNS(SVG_NAMESPACE_URI,
                                             SVG_MISSING_GLYPH_TAG);


            int missingGlyphCode[] = new int[1];
            missingGlyphCode[0] = commonSizeFont.getMissingGlyphCode();
            GlyphVector gv = commonSizeFont.createGlyphVector(frc, missingGlyphCode);
            Shape missingGlyphShape = gv.getGlyphOutline(0);
            GlyphMetrics gm = gv.getGlyphMetrics(0);


            // need to turn the missing glyph upside down to be in the font
            // coordinate system (i.e Y axis up)
            AffineTransform at = AffineTransform.getScaleInstance(1, -1);
            missingGlyphShape = at.createTransformedShape(missingGlyphShape);


            missingGlyphElement.setAttributeNS(null, SVG_D_ATTRIBUTE,
                                    SVGPath.toSVGPathData(missingGlyphShape, generatorContext));
            missingGlyphElement.setAttributeNS(null, SVG_HORIZ_ADV_X_ATTRIBUTE,
                                               "" + gm.getAdvance());
            fontDef.appendChild(missingGlyphElement);


            // set the font's default horizontal advance to be the same as
            // the missing glyph
            fontDef.setAttributeNS(null, SVG_HORIZ_ADV_X_ATTRIBUTE,  "" + gm.getAdvance());


            // set the ascent and descent attributes
            LineMetrics lm = commonSizeFont.getLineMetrics("By", frc);
            fontFace.setAttributeNS(null, SVG_ASCENT_ATTRIBUTE, "" + lm.getAscent());
            fontFace.setAttributeNS(null, SVG_DESCENT_ATTRIBUTE, "" + lm.getDescent());


            //
            // Font ID
            //
            fontDef.setAttributeNS(null, ATTR_ID,
                                   generatorContext.idGenerator.
                                   generateID(ID_PREFIX_FONT));
        }


        //
        // add any new glyphs to the fontDef here
        //


        // process the characters in textUsingFont backwards since the new chars
        // are at the end, can stop when find a char that already has a glyph
        for (int i = textUsingFont.length()-1; i >= 0; i--) {
            char c = textUsingFont.charAt(i);
            boolean foundGlyph = false;
            NodeList fontChildren = fontDef.getChildNodes();
            for (int j = 0; j < fontChildren.getLength(); j++) {
                if (fontChildren.item(j) instanceof Element) {
                    Element childElement = (Element)fontChildren.item(j);
                    if (childElement.getAttributeNS(null,
                            SVG_UNICODE_ATTRIBUTE).equals(""+c)) {
                        foundGlyph = true;
                        break;
                    }
                }
            }
            if (!foundGlyph) {
                // need to create one
                Element glyphElement
                    = domFactory.createElementNS(SVG_NAMESPACE_URI,
                                                 SVG_GLYPH_TAG);


                GlyphVector gv = commonSizeFont.createGlyphVector(frc, ""+c);
                Shape glyphShape = gv.getGlyphOutline(0);
                GlyphMetrics gm = gv.getGlyphMetrics(0);


                // need to turn the glyph upside down to be in the font
                // coordinate system (i.e Y axis up)
                AffineTransform at = AffineTransform.getScaleInstance(1, -1);
                glyphShape = at.createTransformedShape(glyphShape);

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    public GVTGlyphVector createGlyphVector(FontRenderContext frc,
                                            char[] chars) {


        StringCharacterIterator sci =
            new StringCharacterIterator(new String(chars));
        GlyphVector gv = awtFont.createGlyphVector(frc, chars);
        return new AWTGVTGlyphVector(gv, this, scale, sci);
    }

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