swtgraphics2d.java

JFreeChart它主要是用来制作各种各样的图表

     *
     * @see java.awt.Graphics#drawString(java.lang.String, int, int)
     */
    public void drawString(String text, int x, int y) {
        float fm = this.gc.getFontMetrics().getAscent();
        this.gc.drawString(text, x, (int) (y - fm), true);
    }

    /**
     * Draws a string at the specified position.
     *
     * @param text  the string.
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     */
    public void drawString(String text, float x, float y) {
        float fm = this.gc.getFontMetrics().getAscent();
        this.gc.drawString(text, (int) x, (int) (y - fm), true);
    }

    /**
     * Draws a string at the specified position.
     *
     * @param iterator  the string.
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     */
    public void drawString(AttributedCharacterIterator iterator, int x, int y) {
        // TODO Auto-generated method stub
    }

    /**
     * Draws a string at the specified position.
     *
     * @param iterator  the string.
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     */
    public void drawString(AttributedCharacterIterator iterator, float x,
            float y) {
        // TODO Auto-generated method stub
    }

    /**
     * Not implemented - see {@link Graphics2D#hit(Rectangle, Shape, boolean)}.
     *
     * @return <code>false</code>.
     */
    public boolean hit(Rectangle rect, Shape text, boolean onStroke) {
        // TODO Auto-generated method stub
        return false;
    }

    /**
     * Not implemented - see {@link Graphics#copyArea(int, int, int, int, int,
     * int)}.
     */
    public void copyArea(int x, int y, int width, int height, int dx, int dy) {
        // TODO Auto-generated method stub
    }

    /**
     * Not implemented - see {@link Graphics2D#drawImage(Image,
     * AffineTransform, ImageObserver)}.
     *
     * @param image  the image.
     * @param xform  the transform.
     * @param obs  an image observer.
     *
     * @return A boolean.
     */
    public boolean drawImage(Image image, AffineTransform xform,
            ImageObserver obs) {
        // TODO Auto-generated method stub
        return false;
    }

    /**
     * Draws an image.
     *
     * @param image  the image.
     * @param op  the image operation.
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     */
    public void drawImage(BufferedImage image, BufferedImageOp op, int x,
            int y) {
        org.eclipse.swt.graphics.Image im = new org.eclipse.swt.graphics.Image(
                this.gc.getDevice(), SWTUtils.convertToSWT(image));
        this.gc.drawImage(im, x, y);
        im.dispose();
    }

    /**
     * Draws an SWT image with the top left corner of the image aligned to the
     * point (x, y).
     *
     * @param image  the image.
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     */
    public void drawImage(org.eclipse.swt.graphics.Image image, int x, int y) {
        this.gc.drawImage(image, x, y);
    }

    /**
     * Not implemented - see {@link Graphics2D#drawRenderedImage(RenderedImage,
     * AffineTransform)}.
     *
     * @param image  the image.
     * @param xform  the transform.
     */
    public void drawRenderedImage(RenderedImage image, AffineTransform xform) {
        // TODO Auto-generated method stub
    }

    /**
     * Not implemented - see {@link Graphics2D#drawRenderableImage(
     * RenderableImage, AffineTransform)}.
     *
     * @param image  the image.
     * @param xform  the transform.
     */
    public void drawRenderableImage(RenderableImage image,
            AffineTransform xform) {
        // TODO Auto-generated method stub

    }

    /**
     * Draws an image with the top left corner aligned to the point (x, y).
     *
     * @param image  the image.
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     * @param observer  ignored here.
     *
     * @return <code>true</code> if the image has been drawn.
     */
    public boolean drawImage(Image image, int x, int y,
            ImageObserver observer) {
        ImageData data = SWTUtils.convertAWTImageToSWT(image);
        if (data == null) {
            return false;
        }
        org.eclipse.swt.graphics.Image im = new org.eclipse.swt.graphics.Image(
                this.gc.getDevice(), data);
        this.gc.drawImage(im, x, y);
        im.dispose();
        return true;
    }

    /**
     * Draws an image with the top left corner aligned to the point (x, y),
     * and scaled to the specified width and height.
     *
     * @param image  the image.
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     * @param width  the width for the rendered image.
     * @param height  the height for the rendered image.
     * @param observer  ignored here.
     *
     * @return <code>true</code> if the image has been drawn.
     */
    public boolean drawImage(Image image, int x, int y, int width, int height,
            ImageObserver observer) {
        ImageData data = SWTUtils.convertAWTImageToSWT(image);
        if (data == null) {
            return false;
        }
        org.eclipse.swt.graphics.Image im = new org.eclipse.swt.graphics.Image(
                this.gc.getDevice(), data);
        org.eclipse.swt.graphics.Rectangle bounds = im.getBounds();
        this.gc.drawImage(im, 0, 0, bounds.width, bounds.height, x, y, width,
                height);
        im.dispose();
        return true;
    }

    /**
     * Draws an image.
     *
     * @param image (<code>null</code> not permitted).
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     * @param bgcolor  the background color.
     * @param observer  an image observer.
     *
     * @return A boolean.
     */
    public boolean drawImage(Image image, int x, int y, Color bgcolor,
            ImageObserver observer) {
        if (image == null) {
            throw new IllegalArgumentException("Null 'image' argument.");
        }
        int w = image.getWidth(null);
        int h = image.getHeight(null);
        if (w == -1 || h == -1) {
            return false;
        }
        Paint savedPaint = getPaint();
        fill(new Rectangle2D.Double(x, y, w, h));
        setPaint(savedPaint);
        return drawImage(image, x, y, observer);
    }

    /**
     * Draws an image.
     *
     * @param image  the image (<code>null</code> not permitted).
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     * @param width  the width.
     * @param height  the height.
     * @param bgcolor  the background colour.
     * @param observer  an image observer.
     *
     * @return A boolean.
     */
    public boolean drawImage(Image image, int x, int y, int width, int height,
            Color bgcolor, ImageObserver observer) {
        if (image == null) {
            throw new IllegalArgumentException("Null 'image' argument.");
        }
        int w = image.getWidth(null);
        int h = image.getHeight(null);
        if (w == -1 || h == -1) {
            return false;
        }
        Paint savedPaint = getPaint();
        fill(new Rectangle2D.Double(x, y, w, h));
        setPaint(savedPaint);
        return drawImage(image, x, y, width, height, observer);
    }

    /**
     * Not implemented - see {@link Graphics#drawImage(Image, int, int, int,
     *     int, int, int, int, int, ImageObserver)}.
     *
     * @param image  the image.
     * @param dx1
     * @param dy1
     * @param dx2
     * @param dy2
     * @param sx1
     * @param sy1
     * @param sx2
     * @param sy2
     * @param observer
     */
    public boolean drawImage(Image image, int dx1, int dy1, int dx2, int dy2,
            int sx1, int sy1, int sx2, int sy2, ImageObserver observer) {
        // TODO Auto-generated method stub
        return false;
    }

    /**
     * Not implemented - see {@link Graphics#drawImage(Image, int, int, int,
     *     int, int, int, int, int, Color, ImageObserver)}.
     *
     * @param image  the image.
     * @param dx1
     * @param dy1
     * @param dx2
     * @param dy2
     * @param sx1
     * @param sy1
     * @param sx2
     * @param sy2
     * @param bgcolor
     * @param observer
     */
    public boolean drawImage(Image image, int dx1, int dy1, int dx2, int dy2,
            int sx1, int sy1, int sx2, int sy2, Color bgcolor,
            ImageObserver observer) {
        // TODO Auto-generated method stub
        return false;
    }

    /**
     * Releases resources held by this instance (but note that the caller
     * must dispose of the 'GC' passed to the constructor).
     *
     * @see java.awt.Graphics#dispose()
     */
    public void dispose() {
        // we dispose resources we own but user must dispose gc
        disposeResourcePool();
    }

    /**
     * Add given swt resource to the resource pool. All resources added
     * to the resource pool will be disposed when {@link #dispose()} is called.
     *
     * @param resource the resource to add to the pool.
     * @return the swt <code>Resource</code> just added.
     */
    private Resource addToResourcePool(Resource resource) {
        this.resourcePool.add(resource);
        return resource;
    }

    /**
     * Dispose the resource pool.
     */
    private void disposeResourcePool() {
        for (Iterator it = this.resourcePool.iterator(); it.hasNext();) {
            Resource resource = (Resource) it.next();
            resource.dispose();
        }
        this.fontsPool.clear();
        this.colorsPool.clear();
        this.transformsPool.clear();
        this.resourcePool.clear();
    }

    /**
     * Internal method to convert a AWT font object into
     * a SWT font resource. If a corresponding SWT font
     * instance is already in the pool, it will be used
     * instead of creating a new one. This is used in
     * {@link #setFont()} for instance.
     *
     * @param font The AWT font to convert.
     * @return The SWT font instance.
     */
    private org.eclipse.swt.graphics.Font getSwtFontFromPool(Font font) {
        org.eclipse.swt.graphics.Font swtFont = (org.eclipse.swt.graphics.Font)
        this.fontsPool.get(font);
        if (swtFont == null) {
            swtFont = new org.eclipse.swt.graphics.Font(this.gc.getDevice(),
                    SWTUtils.toSwtFontData(this.gc.getDevice(), font, true));
            addToResourcePool(swtFont);
            this.fontsPool.put(font, swtFont);
        }
        return swtFont;
    }

    /**
     * Internal method to convert a AWT color object into
     * a SWT color resource. If a corresponding SWT color
     * instance is already in the pool, it will be used
     * instead of creating a new one. This is used in
     * {@link #setColor()} for instance.
     *
     * @param awtColor The AWT color to convert.
     * @return A SWT color instance.
     */
    private org.eclipse.swt.graphics.Color getSwtColorFromPool(Color awtColor) {
        org.eclipse.swt.graphics.Color swtColor =
                (org.eclipse.swt.graphics.Color)
                // we can't use the following valueOf() method, because it
                // won't compile with JDK1.4
                // this.colorsPool.get(Integer.valueOf(awtColor.getRGB()));
                this.colorsPool.get(new Integer(awtColor.getRGB()));
        if (swtColor == null) {
            swtColor = SWTUtils.toSwtColor(this.gc.getDevice(), awtColor);
            addToResourcePool(swtColor);
            // see comment above
            //this.colorsPool.put(Integer.valueOf(awtColor.getRGB()), swtColor);
            this.colorsPool.put(new Integer(awtColor.getRGB()), swtColor);
        }
        return swtColor;
    }

    /**
     * Internal method to convert a AWT transform object into
     * a SWT transform resource. If a corresponding SWT transform
     * instance is already in the pool, it will be used
     * instead of creating a new one. This is used in
     * {@link #setTransform()} for instance.
     *
     * @param awtTransform The AWT transform to convert.
     * @return A SWT transform instance.
     */
    private Transform getSwtTransformFromPool(AffineTransform awtTransform) {
        Transform t = (Transform) this.transformsPool.get(awtTransform);
        if (t == null) {
            t = new Transform(this.gc.getDevice());
            double[] matrix = new double[6];
            awtTransform.getMatrix(matrix);
            t.setElements((float) matrix[0], (float) matrix[1],
                    (float) matrix[2], (float) matrix[3],
                    (float) matrix[4], (float) matrix[5]);
            addToResourcePool(t);
            this.transformsPool.put(awtTransform, t);
        }
        return t;
    }

    /**
     * Perform a switch between foreground and background
     * color of gc. This is needed for consistency with
     * the awt behaviour, and is required notably for the
     * filling methods.
     */
    private void switchColors() {
        org.eclipse.swt.graphics.Color bg = this.gc.getBackground();
        org.eclipse.swt.graphics.Color fg = this.gc.getForeground();
        this.gc.setBackground(fg);
        this.gc.setForeground(bg);
    }

    /**
     * Converts an AWT <code>Shape</code> into a SWT <code>Path</code>.
     *
     * @param shape  the shape (<code>null</code> not permitted).
     *
     * @return The path.
     */
    private Path toSwtPath(Shape shape) {
        int type;
        float[] coords = new float[6];
        Path path = new Path(this.gc.getDevice());
        PathIterator pit = shape.getPathIterator(null);
        while (!pit.isDone()) {
            type = pit.currentSegment(coords);
            switch (type) {
                case (PathIterator.SEG_MOVETO):
                    path.moveTo(coords[0], coords[1]);
                    break;
                case (PathIterator.SEG_LINETO):
                    path.lineTo(coords[0], coords[1]);
                    break;
                case (PathIterator.SEG_QUADTO):
                    path.quadTo(coords[0], coords[1], coords[2], coords[3]);
                    break;
                case (PathIterator.SEG_CUBICTO):
                    path.cubicTo(coords[0], coords[1], coords[2],
                            coords[3], coords[4], coords[5]);
                    break;
                case (PathIterator.SEG_CLOSE):
                    path.close();
                    break;
                default:
                    break;
            }
            pit.next();
        }
        return path;
    }

    /**
     * Converts an SWT transform into the equivalent AWT transform.
     *
     * @param swtTransform  the SWT transform.
     *
     * @return The AWT transform.
     */
    private AffineTransform toAwtTransform(Transform swtTransform) {
        float[] elements = new float[6];
        swtTransform.getElements(elements);
        AffineTransform awtTransform = new AffineTransform(elements);
        return awtTransform;
    }

}