Java中Image的水準翻轉、縮放與自由旋轉操作

老生常談了，直接看代碼。

bufferedimage.getColorModel().getTransparency()以獲得原始圖檔透明度用于生成緩存圖，在緩存圖進行相應操作即可。

/**

     * 旋轉圖檔為指定角度

     * 

     * @param bufferedimage

     *            目标圖像

     * @param degree

     *            旋轉角度

     * @return

     */

    public static BufferedImage rotateImage(final BufferedImage bufferedimage,

            final int degree) {

        int w = bufferedimage.getWidth();

        int h = bufferedimage.getHeight();

        int type = bufferedimage.getColorModel().getTransparency();

        BufferedImage img;

        Graphics2D graphics2d;

        (graphics2d = (img = new BufferedImage(w, h, type))

                .createGraphics()).setRenderingHint(

                RenderingHints.KEY_INTERPOLATION,

                RenderingHints.VALUE_INTERPOLATION_BILINEAR);

        graphics2d.rotate(Math.toRadians(degree), w / 2, h / 2);

        graphics2d.drawImage(bufferedimage, 0, 0, null);

        graphics2d.dispose();

        return img;

    }

    /**

     * 變更圖像為指定大小

     * @param w

     *            寬

     * @param h

     *            高

    public static BufferedImage resizeImage(final BufferedImage bufferedimage,

            final int w, final int h) {

        (graphics2d = (img = createImage(w, h, type))

        graphics2d.drawImage(bufferedimage, 0, 0, w, h, 0, 0, bufferedimage

                .getWidth(), bufferedimage.getHeight(), null);

     * 水準翻轉圖像

     * @param bufferedimage 目标圖像

    public static BufferedImage flipImage(final BufferedImage bufferedimage) {

        (graphics2d = (img = createImage(w, h, bufferedimage

                .getColorModel().getTransparency())).createGraphics())

                .drawImage(bufferedimage, 0, 0, w, h, w, 0, 0, h, null);

本文轉自 cping 51CTO部落格，原文連結:http://blog.51cto.com/cping1982/130066