swtutils.java

JFreeChart它主要是用来制作各种各样的图表

                color.getBlue());
    }

    /**
     * Creates a swt color instance to match the rgb values
     * of the specified awt paint. For now, this method test
     * if the paint is a color and then return the adequate
     * swt color. Otherwise plain black is assumed.
     *
     * @param device The swt device to draw on (display or gc device).
     * @param paint The awt color to match.
     * @return a swt color object.
     */
    public static Color toSwtColor(Device device, java.awt.Paint paint) {
        java.awt.Color color;
        if (paint instanceof java.awt.Color) {
            color = (java.awt.Color) paint;
        }
        else {
            try {
                throw new Exception("only color is supported at present... "
                        + "setting paint to uniform black color");
            }
            catch (Exception e) {
                e.printStackTrace();
                color = new java.awt.Color(0, 0, 0);
            }
        }
        return new org.eclipse.swt.graphics.Color(device,
                color.getRed(), color.getGreen(), color.getBlue());
    }

    /**
     * Creates a swt color instance to match the rgb values
     * of the specified awt color. alpha channel is not supported.
     * Note that the dispose method will need to be called on the
     * returned object.
     *
     * @param device The swt device to draw on (display or gc device).
     * @param color The awt color to match.
     * @return a swt color object.
     */
    public static Color toSwtColor(Device device, java.awt.Color color) {
        return new org.eclipse.swt.graphics.Color(device,
                color.getRed(), color.getGreen(), color.getBlue());
    }

    /**
     * Transform an awt Rectangle2d instance into a swt one.
     * The coordinates are rounded to integer for the swt object.
     * @param rect2d The awt rectangle to map.
     * @return an swt <code>Rectangle</code> object.
     */
    public static Rectangle toSwtRectangle(Rectangle2D rect2d) {
        return new Rectangle(
                (int) Math.round(rect2d.getMinX()),
                (int) Math.round(rect2d.getMinY()),
                (int) Math.round(rect2d.getWidth()),
                (int) Math.round(rect2d.getHeight()));
    }

    /**
     * Transform a swt Rectangle instance into an awt one.
     * @param rect the swt <code>Rectangle</code>
     * @return a Rectangle2D.Double instance with
     * the eappropriate location and size.
     */
    public static Rectangle2D toAwtRectangle(Rectangle rect) {
        Rectangle2D rect2d = new Rectangle2D.Double();
        rect2d.setRect(rect.x, rect.y, rect.width, rect.height);
        return rect2d;
    }

    /**
     * Returns an AWT point with the same coordinates as the specified
     * SWT point.
     *
     * @param p  the SWT point (<code>null</code> not permitted).
     *
     * @return An AWT point with the same coordinates as <code>p</code>.
     *
     * @see #toSwtPoint(java.awt.Point)
     */
    public static Point2D toAwtPoint(Point p) {
        return new java.awt.Point(p.x, p.y);
    }

    /**
     * Returns an SWT point with the same coordinates as the specified
     * AWT point.
     *
     * @param p  the AWT point (<code>null</code> not permitted).
     *
     * @return An SWT point with the same coordinates as <code>p</code>.
     *
     * @see #toAwtPoint(Point)
     */
    public static Point toSwtPoint(java.awt.Point p) {
        return new Point(p.x, p.y);
    }

    /**
     * Returns an SWT point with the same coordinates as the specified AWT
     * point (rounded to integer values).
     *
     * @param p  the AWT point (<code>null</code> not permitted).
     *
     * @return An SWT point with the same coordinates as <code>p</code>.
     *
     * @see #toAwtPoint(Point)
     */
    public static Point toSwtPoint(java.awt.geom.Point2D p) {
        return new Point((int) Math.round(p.getX()),
                (int) Math.round(p.getY()));
    }

    /**
     * Creates an AWT <code>MouseEvent</code> from a swt event.
     * This method helps passing SWT mouse event to awt components.
     * @param event The swt event.
     * @return A AWT mouse event based on the given SWT event.
     */
    public static MouseEvent toAwtMouseEvent(org.eclipse.swt.events.MouseEvent event) {
        int button = MouseEvent.NOBUTTON;
        switch (event.button) {
        case 1: button = MouseEvent.BUTTON1; break;
        case 2: button = MouseEvent.BUTTON2; break;
        case 3: button = MouseEvent.BUTTON3; break;
        }
        int modifiers = 0;
        if ((event.stateMask & SWT.CTRL) != 0) {
            modifiers |= InputEvent.CTRL_DOWN_MASK;
        }
        if ((event.stateMask & SWT.SHIFT) != 0) {
            modifiers |= InputEvent.SHIFT_DOWN_MASK;
        }
        if ((event.stateMask & SWT.ALT) != 0) {
            modifiers |= InputEvent.ALT_DOWN_MASK;
        }
        MouseEvent awtMouseEvent = new MouseEvent(DUMMY_PANEL, event.hashCode(),
                event.time, modifiers, event.x, event.y, 1, false, button);
        return awtMouseEvent;
    }

    /**
     * Converts an AWT image to SWT.
     *
     * @param image  the image (<code>null</code> not permitted).
     *
     * @return Image data.
     */
    public static ImageData convertAWTImageToSWT(Image image) {
        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 null;
        }
        BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics g = bi.getGraphics();
        g.drawImage(image, 0, 0, null);
        g.dispose();
        return convertToSWT(bi);
    }

    /**
     * Converts a buffered image to SWT <code>ImageData</code>.
     *
     * @param bufferedImage  the buffered image (<code>null</code> not
     *         permitted).
     *
     * @return The image data.
     */
    public static ImageData convertToSWT(BufferedImage bufferedImage) {
        if (bufferedImage.getColorModel() instanceof DirectColorModel) {
            DirectColorModel colorModel
                    = (DirectColorModel) bufferedImage.getColorModel();
            PaletteData palette = new PaletteData(colorModel.getRedMask(),
                    colorModel.getGreenMask(), colorModel.getBlueMask());
            ImageData data = new ImageData(bufferedImage.getWidth(),
                    bufferedImage.getHeight(), colorModel.getPixelSize(),
                    palette);
            WritableRaster raster = bufferedImage.getRaster();
            int[] pixelArray = new int[3];
            for (int y = 0; y < data.height; y++) {
                for (int x = 0; x < data.width; x++) {
                    raster.getPixel(x, y, pixelArray);
                    int pixel = palette.getPixel(new RGB(pixelArray[0],
                            pixelArray[1], pixelArray[2]));
                    data.setPixel(x, y, pixel);
                }
            }
            return data;
        }
        else if (bufferedImage.getColorModel() instanceof IndexColorModel) {
            IndexColorModel colorModel = (IndexColorModel)
                    bufferedImage.getColorModel();
            int size = colorModel.getMapSize();
            byte[] reds = new byte[size];
            byte[] greens = new byte[size];
            byte[] blues = new byte[size];
            colorModel.getReds(reds);
            colorModel.getGreens(greens);
            colorModel.getBlues(blues);
            RGB[] rgbs = new RGB[size];
            for (int i = 0; i < rgbs.length; i++) {
                rgbs[i] = new RGB(reds[i] & 0xFF, greens[i] & 0xFF,
                        blues[i] & 0xFF);
            }
            PaletteData palette = new PaletteData(rgbs);
            ImageData data = new ImageData(bufferedImage.getWidth(),
                    bufferedImage.getHeight(), colorModel.getPixelSize(),
                    palette);
            data.transparentPixel = colorModel.getTransparentPixel();
            WritableRaster raster = bufferedImage.getRaster();
            int[] pixelArray = new int[1];
            for (int y = 0; y < data.height; y++) {
                for (int x = 0; x < data.width; x++) {
                    raster.getPixel(x, y, pixelArray);
                    data.setPixel(x, y, pixelArray[0]);
                }
            }
            return data;
        }
        return null;
    }

}