Java Code Examples for java.awt.geom.AffineTransform#translate()

public static void render( Graphics2D gc, GraphicsNode svgGraphicsNode, Dimension2D svgGraphicsSize, int centerX,
    int centerY, int width, int height, double angleRadians ) {
  double scaleX = width / svgGraphicsSize.getWidth();
  double scaleY = height / svgGraphicsSize.getHeight();

  AffineTransform affineTransform = new AffineTransform();
  if ( centerX != 0 || centerY != 0 ) {
    affineTransform.translate( centerX, centerY );
  }
  affineTransform.scale( scaleX, scaleY );
  if ( angleRadians != 0 ) {
    affineTransform.rotate( angleRadians );
  }
  affineTransform.translate( -svgGraphicsSize.getWidth() / 2, -svgGraphicsSize.getHeight() / 2 );

  svgGraphicsNode.setTransform( affineTransform );

  svgGraphicsNode.paint( gc );
}
 

public BufferedImage generateCenteredImage(int imageWidth, int imageHeight,
                                           Point2D.Double centerLocation,
                                           Image logoImage) {
    try {
        panelController.getInteractionLock().readLock().lock();
        if ( panelController.getScrollController().getVisibleRectangle().width == 0 ||
             panelController.getScrollController().getVisibleRectangle().height == 0 ) {
            return null;
        }
        BufferedImage image = new BufferedImage(imageWidth, imageHeight,
            BufferedImage.TYPE_INT_RGB);
        
        Rectangle2D.Double bounds = getRendererBounds(imageWidth, imageHeight, centerLocation);
        AffineTransform transform = new AffineTransform();
        transform.scale(panelController.getScrollController().getScalingZoomFactor(), panelController.getScrollController().getScalingZoomFactor());
        transform.translate(-bounds.getMinX(),-bounds.getMinY());
 
        paintImage(image, logoImage, transform);
        return image;
    }
    finally {
        panelController.getInteractionLock().readLock().unlock();
    }
}
 

public static void rotateSelection(VisualModel vm, double theta) {
    Rectangle2D selectionBB = getNodesCoordinateBox(vm.getSelection());
    if (selectionBB != null) {
        AffineTransform t = new AffineTransform();
        Point2D cp = new Point2D.Double(selectionBB.getCenterX(), selectionBB.getCenterY());

        t.translate(cp.getX(), cp.getY());
        t.rotate(theta);
        t.translate(-cp.getX(), -cp.getY());

        transformNodes(vm.getSelection(), t);
    }
}
 

/**
 * Paints the background of a formatted text field.
 *
 * @param context SynthContext identifying the <code>JComponent</code> and
 *        <code>Region</code> to paint to
 * @param g <code>Graphics</code> to paint to
 * @param x X coordinate of the area to paint to
 * @param y Y coordinate of the area to paint to
 * @param w Width of the area to paint to
 * @param h Height of the area to paint to
 */
public void paintFormattedTextFieldBackground(SynthContext context,
                                      Graphics g, int x, int y,
                                      int w, int h) {
    if (context.getComponent().getComponentOrientation().isLeftToRight()){
        paintBackground(context, g, x, y, w, h, null);
    } else {
        AffineTransform transform = new AffineTransform();
        transform.translate(x,y);
        transform.scale(-1, 1);
        transform.translate(-w,0);
        paintBackground(context, g, 0, 0, w, h, transform);
    }
}
 

/**
 * Paints the border of a formatted text field.
 *
 * @param context SynthContext identifying the <code>JComponent</code> and
 *        <code>Region</code> to paint to
 * @param g <code>Graphics</code> to paint to
 * @param x X coordinate of the area to paint to
 * @param y Y coordinate of the area to paint to
 * @param w Width of the area to paint to
 * @param h Height of the area to paint to
 */
public void paintFormattedTextFieldBorder(SynthContext context,
                                  Graphics g, int x, int y,
                                  int w, int h) {
    if (context.getComponent().getComponentOrientation().isLeftToRight()){
        paintBorder(context, g, x, y, w, h, null);
    } else {
        AffineTransform transform = new AffineTransform();
        transform.translate(x,y);
        transform.scale(-1, 1);
        transform.translate(-w,0);
        paintBorder(context, g, 0, 0, w, h, transform);
    }
}
 

public void init(Graphics2D g2d, Context ctx, Dimension dim) {
    int w = dim.width;
    int h = dim.height;
    AffineTransform at = new AffineTransform();
    at.translate(0.0, (h - (w*h)/(w + h*0.1)) / 2);
    at.shear(0.1, 0.0);
    g2d.transform(at);
    dim.setSize(scaleForTransform(at, dim));
}
 

protected void addImage(Graphics2D graphics, ImageResult imageResult, MapViewport viewport) throws IOException {
	Rectangle screenArea = viewport.getScreenArea();
	ReferencedEnvelope worldBounds = viewport.getBounds();
	// convert map bounds to application bounds
	double printScale = screenArea.getWidth() / worldBounds.getWidth();
	if (tileScale < 0) {
		tileScale = printScale;
	}
	Envelope applicationBounds = new Envelope((worldBounds.getMinX()) * printScale, (worldBounds.getMaxX())
			* printScale, -(worldBounds.getMinY()) * printScale, -(worldBounds.getMaxY()) * printScale);
	Bbox imageBounds = imageResult.getRasterImage().getBounds();
	// find transform between image bounds and application bounds
	double tx = (imageBounds.getX() * printScale / tileScale - applicationBounds.getMinX());
	double ty = (imageBounds.getY() * printScale / tileScale - applicationBounds.getMinY());
	BufferedImage image = ImageIO.read(new ByteArrayInputStream(imageResult.getImage()));
	double scaleX = imageBounds.getWidth() / image.getWidth() * printScale / tileScale;
	double scaleY = imageBounds.getHeight() / image.getHeight() * printScale / tileScale;
	AffineTransform transform = new AffineTransform();
	transform.translate(tx, ty);
	transform.scale(scaleX, scaleY);
	if (log.isDebugEnabled()) {
		log.debug("adding image, width=" + image.getWidth() + ",height=" + image.getHeight() + ",x=" + tx + ",y="
				+ ty);
	}
	// opacity
	log.debug("before drawImage");
	// create a copy to apply transform
	Graphics2D g = (Graphics2D) graphics.create();
	// apply opacity to image off-graphics to avoid interference with whatever opacity model is used by graphics
	BufferedImage opaqueCopy = makeOpaque(image);
	g.drawImage(opaqueCopy, transform, null);
	log.debug("after drawImage");
}
 

/**
 * Paints the background of a combo box.
 *
 * @param context SynthContext identifying the <code>JComponent</code> and
 *        <code>Region</code> to paint to
 * @param g <code>Graphics</code> to paint to
 * @param x X coordinate of the area to paint to
 * @param y Y coordinate of the area to paint to
 * @param w Width of the area to paint to
 * @param h Height of the area to paint to
 */
public void paintComboBoxBackground(SynthContext context,
                                    Graphics g, int x, int y,
                                    int w, int h) {
    if (context.getComponent().getComponentOrientation().isLeftToRight()){
        paintBackground(context, g, x, y, w, h, null);
    } else {
        AffineTransform transform = new AffineTransform();
        transform.translate(x,y);
        transform.scale(-1, 1);
        transform.translate(-w,0);
        paintBackground(context, g, 0, 0, w, h, transform);
    }
}
 

public void drawConditionalSequenceFlowIndicator(Line2D.Double line) {
  int horizontal = (int) (CONDITIONAL_INDICATOR_WIDTH * 0.7);
  int halfOfHorizontal = horizontal / 2;
  int halfOfVertical = CONDITIONAL_INDICATOR_WIDTH / 2;

  Polygon conditionalIndicator = new Polygon();
  conditionalIndicator.addPoint(0, 0);
  conditionalIndicator.addPoint(-halfOfHorizontal, halfOfVertical);
  conditionalIndicator.addPoint(0, CONDITIONAL_INDICATOR_WIDTH);
  conditionalIndicator.addPoint(halfOfHorizontal, halfOfVertical);

  AffineTransform transformation = new AffineTransform();
  transformation.setToIdentity();
  double angle = Math.atan2(line.y2 - line.y1, line.x2 - line.x1);
  transformation.translate(line.x1, line.y1);
  transformation.rotate((angle - Math.PI / 2d));

  AffineTransform originalTransformation = g.getTransform();
  g.setTransform(transformation);
  g.draw(conditionalIndicator);

  Paint originalPaint = g.getPaint();
  g.setPaint(CONDITIONAL_INDICATOR_COLOR);
  g.fill(conditionalIndicator);

  g.setPaint(originalPaint);
  g.setTransform(originalTransformation);
}
 

/**
 * Paints the background of a combo box.
 *
 * @param context SynthContext identifying the <code>JComponent</code> and
 *        <code>Region</code> to paint to
 * @param g <code>Graphics</code> to paint to
 * @param x X coordinate of the area to paint to
 * @param y Y coordinate of the area to paint to
 * @param w Width of the area to paint to
 * @param h Height of the area to paint to
 */
public void paintComboBoxBackground(SynthContext context,
                                    Graphics g, int x, int y,
                                    int w, int h) {
    if (context.getComponent().getComponentOrientation().isLeftToRight()){
        paintBackground(context, g, x, y, w, h, null);
    } else {
        AffineTransform transform = new AffineTransform();
        transform.translate(x,y);
        transform.scale(-1, 1);
        transform.translate(-w,0);
        paintBackground(context, g, 0, 0, w, h, transform);
    }
}
 

/**
 * Paints the background of a text field.
 *
 * @param context SynthContext identifying the <code>JComponent</code> and
 *        <code>Region</code> to paint to
 * @param g <code>Graphics</code> to paint to
 * @param x X coordinate of the area to paint to
 * @param y Y coordinate of the area to paint to
 * @param w Width of the area to paint to
 * @param h Height of the area to paint to
 */
public void paintTextFieldBackground(SynthContext context,
                                      Graphics g, int x, int y,
                                      int w, int h) {
    if (context.getComponent().getComponentOrientation().isLeftToRight()){
        paintBackground(context, g, x, y, w, h, null);
    } else {
        AffineTransform transform = new AffineTransform();
        transform.translate(x,y);
        transform.scale(-1, 1);
        transform.translate(-w,0);
        paintBackground(context, g, 0, 0, w, h, transform);
    }
}
 

/**
 * Paints the background of a text field.
 *
 * @param context SynthContext identifying the <code>JComponent</code> and
 *                <code>Region</code> to paint to
 * @param g       <code>Graphics</code> to paint to
 * @param x       X coordinate of the area to paint to
 * @param y       Y coordinate of the area to paint to
 * @param w       Width of the area to paint to
 * @param h       Height of the area to paint to
 */
public void paintTextFieldBackground(SynthContext context, Graphics g, int x, int y, int w, int h) {
    if (context.getComponent().getComponentOrientation().isLeftToRight()) {
        paintBackground(context, g, x, y, w, h, null);
    } else {
        AffineTransform transform = new AffineTransform();

        transform.translate(x, y);
        transform.scale(-1, 1);
        transform.translate(-w, 0);
        paintBackground(context, g, 0, 0, w, h, transform);
    }
}
 

@Override
public Transition2DInstruction[] getInstructions(float progress,
		Dimension size) {
	if (type == OUT) {
		progress = 1 - progress;
	}
	AffineTransform transform = new AffineTransform();
	transform.translate(size.width / 2, size.height / 2);
	transform.scale(progress, progress);
	transform.rotate((1 - progress) * 6);
	transform.translate(-size.width / 2, -size.height / 2);

	return new ImageInstruction[] { new ImageInstruction(type == IN),
			new ImageInstruction(type != IN, transform, null) };
}
 

/**
 * Draw arraw
 *
 * @param g Graphics2D
 * @param sP Start point
 * @param angle Angle
 */
public static void drawArraw(Graphics2D g, PointF sP, double angle) {
    GeneralPath path = new GeneralPath(GeneralPath.WIND_EVEN_ODD, 5);
    Rectangle.Float rect = new Rectangle.Float(-4, -4, 8, 8);
    PointF[] pt = new PointF[5];
    pt[0] = new PointF(rect.x, rect.y);
    pt[1] = new PointF(rect.x + rect.width, rect.y + (rect.height / 2));
    pt[2] = new PointF(rect.x, rect.y + rect.height);
    pt[3] = new PointF(rect.x + rect.width / 2, pt[1].Y);
    pt[4] = pt[0];
    path.moveTo(pt[0].X, pt[0].Y);
    for (int i = 1; i < 5; i++) {
        path.lineTo(pt[i].X, pt[i].Y);
    }

    AffineTransform tempTrans = g.getTransform();
    if (angle != 0) {
        //AffineTransform myTrans = new AffineTransform();         
        AffineTransform myTrans = (AffineTransform) tempTrans.clone();
        //myTrans.translate(tempTrans.getTranslateX() + sP.X, tempTrans.getTranslateY() + sP.Y);
        myTrans.translate(sP.X, sP.Y);
        double angle1 = angle - 90;
        myTrans.rotate(angle1 * Math.PI / 180);
        g.setTransform(myTrans);
    }
    path.closePath();
    g.fill(path);

    if (angle != 0) {
        g.setTransform(tempTrans);
    }
}
 

/**
 * We use OpenGL's texture coordinate generator to automatically
 * map the TexturePaint image to the geometry being rendered.  The
 * generator uses two separate plane equations that take the (x,y)
 * location (in device space) of the fragment being rendered to
 * calculate (u,v) texture coordinates for that fragment:
 *     u = Ax + By + Cz + Dw
 *     v = Ex + Fy + Gz + Hw
 *
 * Since we use a 2D orthographic projection, we can assume that z=0
 * and w=1 for any fragment.  So we need to calculate appropriate
 * values for the plane equation constants (A,B,D) and (E,F,H) such
 * that {u,v}=0 for the top-left of the TexturePaint's anchor
 * rectangle and {u,v}=1 for the bottom-right of the anchor rectangle.
 * We can easily make the texture image repeat for {u,v} values
 * outside the range [0,1] by specifying the GL_REPEAT texture wrap
 * mode.
 *
 * Calculating the plane equation constants is surprisingly simple.
 * We can think of it as an inverse matrix operation that takes
 * device space coordinates and transforms them into user space
 * coordinates that correspond to a location relative to the anchor
 * rectangle.  First, we translate and scale the current user space
 * transform by applying the anchor rectangle bounds.  We then take
 * the inverse of this affine transform.  The rows of the resulting
 * inverse matrix correlate nicely to the plane equation constants
 * we were seeking.
 */
private static void setTexturePaint(RenderQueue rq,
                                    SunGraphics2D sg2d,
                                    TexturePaint paint,
                                    boolean useMask)
{
    BufferedImage bi = paint.getImage();
    SurfaceData dstData = sg2d.surfaceData;
    SurfaceData srcData =
        dstData.getSourceSurfaceData(bi, SunGraphics2D.TRANSFORM_ISIDENT,
                                     CompositeType.SrcOver, null);
    boolean filter =
        (sg2d.interpolationType !=
         AffineTransformOp.TYPE_NEAREST_NEIGHBOR);

    // calculate plane equation constants
    AffineTransform at = (AffineTransform)sg2d.transform.clone();
    Rectangle2D anchor = paint.getAnchorRect();
    at.translate(anchor.getX(), anchor.getY());
    at.scale(anchor.getWidth(), anchor.getHeight());

    double xp0, xp1, xp3, yp0, yp1, yp3;
    try {
        at.invert();
        xp0 = at.getScaleX();
        xp1 = at.getShearX();
        xp3 = at.getTranslateX();
        yp0 = at.getShearY();
        yp1 = at.getScaleY();
        yp3 = at.getTranslateY();
    } catch (java.awt.geom.NoninvertibleTransformException e) {
        xp0 = xp1 = xp3 = yp0 = yp1 = yp3 = 0.0;
    }

    // assert rq.lock.isHeldByCurrentThread();
    rq.ensureCapacityAndAlignment(68, 12);
    RenderBuffer buf = rq.getBuffer();
    buf.putInt(SET_TEXTURE_PAINT);
    buf.putInt(useMask ? 1 : 0);
    buf.putInt(filter ? 1 : 0);
    buf.putLong(srcData.getNativeOps());
    buf.putDouble(xp0).putDouble(xp1).putDouble(xp3);
    buf.putDouble(yp0).putDouble(yp1).putDouble(yp3);
}
 

/**
 * We use OpenGL's texture coordinate generator to automatically
 * map the TexturePaint image to the geometry being rendered.  The
 * generator uses two separate plane equations that take the (x,y)
 * location (in device space) of the fragment being rendered to
 * calculate (u,v) texture coordinates for that fragment:
 *     u = Ax + By + Cz + Dw
 *     v = Ex + Fy + Gz + Hw
 *
 * Since we use a 2D orthographic projection, we can assume that z=0
 * and w=1 for any fragment.  So we need to calculate appropriate
 * values for the plane equation constants (A,B,D) and (E,F,H) such
 * that {u,v}=0 for the top-left of the TexturePaint's anchor
 * rectangle and {u,v}=1 for the bottom-right of the anchor rectangle.
 * We can easily make the texture image repeat for {u,v} values
 * outside the range [0,1] by specifying the GL_REPEAT texture wrap
 * mode.
 *
 * Calculating the plane equation constants is surprisingly simple.
 * We can think of it as an inverse matrix operation that takes
 * device space coordinates and transforms them into user space
 * coordinates that correspond to a location relative to the anchor
 * rectangle.  First, we translate and scale the current user space
 * transform by applying the anchor rectangle bounds.  We then take
 * the inverse of this affine transform.  The rows of the resulting
 * inverse matrix correlate nicely to the plane equation constants
 * we were seeking.
 */
private static void setTexturePaint(RenderQueue rq,
                                    SunGraphics2D sg2d,
                                    TexturePaint paint,
                                    boolean useMask)
{
    BufferedImage bi = paint.getImage();
    SurfaceData dstData = sg2d.surfaceData;
    SurfaceData srcData =
        dstData.getSourceSurfaceData(bi, SunGraphics2D.TRANSFORM_ISIDENT,
                                     CompositeType.SrcOver, null);
    boolean filter =
        (sg2d.interpolationType !=
         AffineTransformOp.TYPE_NEAREST_NEIGHBOR);

    // calculate plane equation constants
    AffineTransform at = (AffineTransform)sg2d.transform.clone();
    Rectangle2D anchor = paint.getAnchorRect();
    at.translate(anchor.getX(), anchor.getY());
    at.scale(anchor.getWidth(), anchor.getHeight());

    double xp0, xp1, xp3, yp0, yp1, yp3;
    try {
        at.invert();
        xp0 = at.getScaleX();
        xp1 = at.getShearX();
        xp3 = at.getTranslateX();
        yp0 = at.getShearY();
        yp1 = at.getScaleY();
        yp3 = at.getTranslateY();
    } catch (java.awt.geom.NoninvertibleTransformException e) {
        xp0 = xp1 = xp3 = yp0 = yp1 = yp3 = 0.0;
    }

    // assert rq.lock.isHeldByCurrentThread();
    rq.ensureCapacityAndAlignment(68, 12);
    RenderBuffer buf = rq.getBuffer();
    buf.putInt(SET_TEXTURE_PAINT);
    buf.putInt(useMask ? 1 : 0);
    buf.putInt(filter ? 1 : 0);
    buf.putLong(srcData.getNativeOps());
    buf.putDouble(xp0).putDouble(xp1).putDouble(xp3);
    buf.putDouble(yp0).putDouble(yp1).putDouble(yp3);
}
 

/**
 * This method calculates six m** values and a focusX value that
 * are used by the native fragment shader.  These techniques are
 * based on a whitepaper by Daniel Rice on radial gradient performance
 * (attached to the bug report for 6521533).  One can refer to that
 * document for the complete set of formulas and calculations, but
 * the basic goal is to compose a transform that will convert an
 * (x,y) position in device space into a "u" value that represents
 * the relative distance to the gradient focus point.  The resulting
 * value can be used to look up the appropriate color by linearly
 * interpolating between the two nearest colors in the gradient.
 */
private static void setRadialGradientPaint(RenderQueue rq,
                                           SunGraphics2D sg2d,
                                           RadialGradientPaint paint,
                                           boolean useMask)
{
    boolean linear =
        (paint.getColorSpace() == ColorSpaceType.LINEAR_RGB);
    int cycleMethod = paint.getCycleMethod().ordinal();
    float[] fractions = paint.getFractions();
    Color[] colors = paint.getColors();
    int numStops = colors.length;
    int[] pixels = convertToIntArgbPrePixels(colors, linear);
    Point2D center = paint.getCenterPoint();
    Point2D focus = paint.getFocusPoint();
    float radius = paint.getRadius();

    // save original (untransformed) center and focus points
    double cx = center.getX();
    double cy = center.getY();
    double fx = focus.getX();
    double fy = focus.getY();

    // transform from gradient coords to device coords
    AffineTransform at = paint.getTransform();
    at.preConcatenate(sg2d.transform);
    focus = at.transform(focus, focus);

    // transform unit circle to gradient coords; we start with the
    // unit circle (center=(0,0), focus on positive x-axis, radius=1)
    // and then transform into gradient space
    at.translate(cx, cy);
    at.rotate(fx - cx, fy - cy);
    at.scale(radius, radius);

    // invert to get mapping from device coords to unit circle
    try {
        at.invert();
    } catch (Exception e) {
        at.setToScale(0.0, 0.0);
    }
    focus = at.transform(focus, focus);

    // clamp the focus point so that it does not rest on, or outside
    // of, the circumference of the gradient circle
    fx = Math.min(focus.getX(), 0.99);

    // assert rq.lock.isHeldByCurrentThread();
    rq.ensureCapacity(20 + 28 + (numStops*4*2));
    RenderBuffer buf = rq.getBuffer();
    buf.putInt(SET_RADIAL_GRADIENT_PAINT);
    buf.putInt(useMask ? 1 : 0);
    buf.putInt(linear  ? 1 : 0);
    buf.putInt(numStops);
    buf.putInt(cycleMethod);
    buf.putFloat((float)at.getScaleX());
    buf.putFloat((float)at.getShearX());
    buf.putFloat((float)at.getTranslateX());
    buf.putFloat((float)at.getShearY());
    buf.putFloat((float)at.getScaleY());
    buf.putFloat((float)at.getTranslateY());
    buf.putFloat((float)fx);
    buf.put(fractions);
    buf.put(pixels);
}
 

@Override
public void paint(Graphics g) {

	if (shapes.isEmpty()) {
		return;
	}

	Graphics2D g2d = (Graphics2D) g;
	AffineTransform oldXform = g2d.getTransform();

	RenderContext<?, ?> rc = viewer.getRenderContext();
	MultiLayerTransformer multiLayerTransformer = rc.getMultiLayerTransformer();
	MutableTransformer layoutXformer = multiLayerTransformer.getTransformer(Layer.LAYOUT);
	AffineTransform layoutXform = layoutXformer.getTransform();

	double tx = layoutXform.getTranslateX();
	double ty = layoutXform.getTranslateY();

	for (PaintableShape s : shapes) {

		if (s.isShapeFinished()) {
			// this will draw the shape, after dragging is finished, at a position
			// relative to its start point 
			double dx = tx - s.getTx();
			double dy = ty - s.getTy();

			AffineTransform newXform = new AffineTransform(oldXform);
			newXform.translate(dx, dy);
			g2d.setTransform(newXform);
		}

		Stroke oldStroke = g2d.getStroke();
		Color oldColor = g2d.getColor();

		s.paint(g2d);

		g2d.setStroke(oldStroke);
		g2d.setColor(oldColor);
		g2d.setTransform(oldXform);
	}
}
 

/**
 * Imports a page from some PDF file as a Form XObject so it can be placed on another page
 * in the target document.
 * <p>
 * You may want to call {@link #wrapInSaveRestore(PDPage) wrapInSaveRestore(PDPage)} before invoking the Form XObject to
 * make sure that the graphics state is reset.
 * 
 * @param sourceDoc the source PDF document that contains the page to be copied
 * @param page the page in the source PDF document to be copied
 * @return a Form XObject containing the original page's content
 * @throws IOException if an I/O error occurs
 */
public PDFormXObject importPageAsForm(PDDocument sourceDoc, PDPage page) throws IOException
{
    importOcProperties(sourceDoc);

    PDStream newStream = new PDStream(targetDoc, page.getContents(), COSName.FLATE_DECODE);
    PDFormXObject form = new PDFormXObject(newStream);

    //Copy resources
    PDResources pageRes = page.getResources();
    PDResources formRes = new PDResources();
    cloner.cloneMerge(pageRes, formRes);
    form.setResources(formRes);

    //Transfer some values from page to form
    transferDict(page.getCOSObject(), form.getCOSObject(), PAGE_TO_FORM_FILTER, true);

    Matrix matrix = form.getMatrix();
    AffineTransform at = matrix.createAffineTransform();
    PDRectangle mediaBox = page.getMediaBox();
    PDRectangle cropBox = page.getCropBox();
    PDRectangle viewBox = (cropBox != null ? cropBox : mediaBox);

    //Handle the /Rotation entry on the page dict
    int rotation = page.getRotation();

    //Transform to FOP's user space
    //at.scale(1 / viewBox.getWidth(), 1 / viewBox.getHeight());
    at.translate(mediaBox.getLowerLeftX() - viewBox.getLowerLeftX(),
            mediaBox.getLowerLeftY() - viewBox.getLowerLeftY());
    switch (rotation)
    {
    case 90:
        at.scale(viewBox.getWidth() / viewBox.getHeight(), viewBox.getHeight() / viewBox.getWidth());
        at.translate(0, viewBox.getWidth());
        at.rotate(-Math.PI / 2.0);
        break;
    case 180:
        at.translate(viewBox.getWidth(), viewBox.getHeight());
        at.rotate(-Math.PI);
        break;
    case 270:
        at.scale(viewBox.getWidth() / viewBox.getHeight(), viewBox.getHeight() / viewBox.getWidth());
        at.translate(viewBox.getHeight(), 0);
        at.rotate(-Math.PI * 1.5);
        break;
    default:
        //no additional transformations necessary
    }
    //Compensate for Crop Boxes not starting at 0,0
    at.translate(-viewBox.getLowerLeftX(), -viewBox.getLowerLeftY());
    if (!at.isIdentity())
    {
        form.setMatrix(at);
    }

    BoundingBox bbox = new BoundingBox();
    bbox.setLowerLeftX(viewBox.getLowerLeftX());
    bbox.setLowerLeftY(viewBox.getLowerLeftY());
    bbox.setUpperRightX(viewBox.getUpperRightX());
    bbox.setUpperRightY(viewBox.getUpperRightY());
    form.setBBox(new PDRectangle(bbox));

    return form;
}
 

/**
 * This method calculates six m** values and a focusX value that
 * are used by the native fragment shader.  These techniques are
 * based on a whitepaper by Daniel Rice on radial gradient performance
 * (attached to the bug report for 6521533).  One can refer to that
 * document for the complete set of formulas and calculations, but
 * the basic goal is to compose a transform that will convert an
 * (x,y) position in device space into a "u" value that represents
 * the relative distance to the gradient focus point.  The resulting
 * value can be used to look up the appropriate color by linearly
 * interpolating between the two nearest colors in the gradient.
 */
private static void setRadialGradientPaint(RenderQueue rq,
                                           SunGraphics2D sg2d,
                                           RadialGradientPaint paint,
                                           boolean useMask)
{
    boolean linear =
        (paint.getColorSpace() == ColorSpaceType.LINEAR_RGB);
    int cycleMethod = paint.getCycleMethod().ordinal();
    float[] fractions = paint.getFractions();
    Color[] colors = paint.getColors();
    int numStops = colors.length;
    int[] pixels = convertToIntArgbPrePixels(colors, linear);
    Point2D center = paint.getCenterPoint();
    Point2D focus = paint.getFocusPoint();
    float radius = paint.getRadius();

    // save original (untransformed) center and focus points
    double cx = center.getX();
    double cy = center.getY();
    double fx = focus.getX();
    double fy = focus.getY();

    // transform from gradient coords to device coords
    AffineTransform at = paint.getTransform();
    at.preConcatenate(sg2d.transform);
    focus = at.transform(focus, focus);

    // transform unit circle to gradient coords; we start with the
    // unit circle (center=(0,0), focus on positive x-axis, radius=1)
    // and then transform into gradient space
    at.translate(cx, cy);
    at.rotate(fx - cx, fy - cy);
    at.scale(radius, radius);

    // invert to get mapping from device coords to unit circle
    try {
        at.invert();
    } catch (Exception e) {
        at.setToScale(0.0, 0.0);
    }
    focus = at.transform(focus, focus);

    // clamp the focus point so that it does not rest on, or outside
    // of, the circumference of the gradient circle
    fx = Math.min(focus.getX(), 0.99);

    // assert rq.lock.isHeldByCurrentThread();
    rq.ensureCapacity(20 + 28 + (numStops*4*2));
    RenderBuffer buf = rq.getBuffer();
    buf.putInt(SET_RADIAL_GRADIENT_PAINT);
    buf.putInt(useMask ? 1 : 0);
    buf.putInt(linear  ? 1 : 0);
    buf.putInt(numStops);
    buf.putInt(cycleMethod);
    buf.putFloat((float)at.getScaleX());
    buf.putFloat((float)at.getShearX());
    buf.putFloat((float)at.getTranslateX());
    buf.putFloat((float)at.getShearY());
    buf.putFloat((float)at.getScaleY());
    buf.putFloat((float)at.getTranslateY());
    buf.putFloat((float)fx);
    buf.put(fractions);
    buf.put(pixels);
}