一个JAVA图形缩放处理工具类
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调用的例子
源代码,如果你复制源代码不方便,来这里:http://www.java2000.net/p10821
- import java.io.FileOutputStream;
- import java.io.IOException;
- import javax.imageio.ImageIO;
- public class T {
- public static void main(String[] args) throws Exception, IOException {
- ImageIO.write(ImageUtils.resizeImage("d:/www.java2000.net.gif", ImageUtils.IMAGE_GIF, 30, 20),
- "JPEG", new FileOutputStream("d:/test.jpg"));
- }
- }
源代码,如果你复制源代码不方便,来这里:http://www.java2000.net/p10821
- import java.awt.Dimension;
- import java.awt.Image;
- import java.awt.image.BufferedImage;
- import java.awt.image.PixelGrabber;
- import java.io.File;
- import java.io.IOException;
- import java.util.Iterator;
- import java.util.Locale;
- import javax.imageio.IIOImage;
- import javax.imageio.ImageIO;
- import javax.imageio.ImageWriteParam;
- import javax.imageio.ImageWriter;
- import javax.imageio.plugins.jpeg.JPEGImageWriteParam;
- import javax.imageio.stream.ImageOutputStream;
- public class ImageUtils {
- public static final int IMAGE_UNKNOWN = -1;
- public static final int IMAGE_JPEG = 0;
- public static final int IMAGE_PNG = 1;
- public static final int IMAGE_GIF = 2;
- /**
- * Resizes an image
- *
- * @param imgName
- * The image name to resize. Must be the complet path to the file
- * @param type
- * int
- * @param maxWidth
- * The image's max width
- * @param maxHeight
- * The image's max height
- * @return A resized <code>BufferedImage</code>
- */
- public static BufferedImage resizeImage(String imgName, int type, int maxWidth, int maxHeight) {
- try {
- return resizeImage(ImageIO.read(new File(imgName)), type, maxWidth, maxHeight);
- } catch (IOException e) {
- e.printStackTrace();
- return null;
- }
- }
- /**
- * Resizes an image.
- *
- * @param image
- * The image to resize
- * @param maxWidth
- * The image's max width
- * @param maxHeight
- * The image's max height
- * @return A resized <code>BufferedImage</code>
- * @param type
- * int
- */
- public static BufferedImage resizeImage(BufferedImage image, int type, int maxWidth, int maxHeight) {
- Dimension largestDimension = new Dimension(maxWidth, maxHeight);
- // Original size
- int imageWidth = image.getWidth(null);
- int imageHeight = image.getHeight(null);
- float aspectRatio = (float) imageWidth / imageHeight;
- if (imageWidth > maxWidth || imageHeight > maxHeight) {
- if ((float) largestDimension.width / largestDimension.height > aspectRatio) {
- largestDimension.width = (int) Math.ceil(largestDimension.height * aspectRatio);
- } else {
- largestDimension.height = (int) Math.ceil(largestDimension.width / aspectRatio);
- }
- imageWidth = largestDimension.width;
- imageHeight = largestDimension.height;
- }
- return createHeadlessSmoothBufferedImage(image, type, imageWidth, imageHeight);
- }
- /**
- * Saves an image to the disk.
- *
- * @param image
- * The image to save
- * @param toFileName
- * The filename to use
- * @param type
- * The image type. Use <code>ImageUtils.IMAGE_JPEG</code> to save as
- * JPEG images, or <code>ImageUtils.IMAGE_PNG</code> to save as PNG.
- * @return <code>false</code> if no appropriate writer is found
- */
- public static boolean saveImage(BufferedImage image, String toFileName, int type) {
- try {
- return ImageIO.write(image, type == IMAGE_JPEG ? "jpg" : "png", new File(toFileName));
- } catch (IOException e) {
- e.printStackTrace();
- return false;
- }
- }
- /**
- * Compress and save an image to the disk. Currently this method only supports
- * JPEG images.
- *
- * @param image
- * The image to save
- * @param toFileName
- * The filename to use
- * @param type
- * The image type. Use <code>ImageUtils.IMAGE_JPEG</code> to save as
- * JPEG images, or <code>ImageUtils.IMAGE_PNG</code> to save as PNG.
- */
- public static void saveCompressedImage(BufferedImage image, String toFileName, int type) {
- try {
- if (type == IMAGE_PNG) {
- throw new UnsupportedOperationException("PNG compression not implemented");
- }
- Iterator iter = ImageIO.getImageWritersByFormatName("jpg");
- ImageWriter writer;
- writer = (ImageWriter) iter.next();
- ImageOutputStream ios = ImageIO.createImageOutputStream(new File(toFileName));
- writer.setOutput(ios);
- ImageWriteParam iwparam = new JPEGImageWriteParam(Locale.getDefault());
- iwparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
- iwparam.setCompressionQuality(0.7F);
- writer.write(null, new IIOImage(image, null, null), iwparam);
- ios.flush();
- writer.dispose();
- ios.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- /**
- * Creates a <code>BufferedImage</code> from an <code>Image</code>. This
- * method can function on a completely headless system. This especially
- * includes Linux and Unix systems that do not have the X11 libraries
- * installed, which are required for the AWT subsystem to operate. This method
- * uses nearest neighbor approximation, so it's quite fast. Unfortunately, the
- * result is nowhere near as nice looking as the
- * createHeadlessSmoothBufferedImage method.
- *
- * @param image
- * The image to convert
- * @param w
- * The desired image width
- * @param h
- * The desired image height
- * @return The converted image
- * @param type
- * int
- */
- public static BufferedImage createHeadlessBufferedImage(BufferedImage image, int type, int width,
- int height) {
- if (type == ImageUtils.IMAGE_PNG && hasAlpha(image)) {
- type = BufferedImage.TYPE_INT_ARGB;
- } else {
- type = BufferedImage.TYPE_INT_RGB;
- }
- BufferedImage bi = new BufferedImage(width, height, type);
- for (int y = 0; y < height; y++) {
- for (int x = 0; x < width; x++) {
- bi.setRGB(x, y, image.getRGB(x * image.getWidth() / width, y * image.getHeight() / height));
- }
- }
- return bi;
- }
- /**
- * Creates a <code>BufferedImage</code> from an <code>Image</code>. This
- * method can function on a completely headless system. This especially
- * includes Linux and Unix systems that do not have the X11 libraries
- * installed, which are required for the AWT subsystem to operate. The
- * resulting image will be smoothly scaled using bilinear filtering.
- *
- * @param source
- * The image to convert
- * @param w
- * The desired image width
- * @param h
- * The desired image height
- * @return The converted image
- * @param type
- * int
- */
- public static BufferedImage createHeadlessSmoothBufferedImage(BufferedImage source, int type,
- int width, int height) {
- if (type == ImageUtils.IMAGE_PNG && hasAlpha(source)) {
- type = BufferedImage.TYPE_INT_ARGB;
- } else {
- type = BufferedImage.TYPE_INT_RGB;
- }
- BufferedImage dest = new BufferedImage(width, height, type);
- int sourcex;
- int sourcey;
- double scalex = (double) width / source.getWidth();
- double scaley = (double) height / source.getHeight();
- int x1;
- int y1;
- double xdiff;
- double ydiff;
- int rgb;
- int rgb1;
- int rgb2;
- for (int y = 0; y < height; y++) {
- sourcey = y * source.getHeight() / dest.getHeight();
- ydiff = scale(y, scaley) - sourcey;
- for (int x = 0; x < width; x++) {
- sourcex = x * source.getWidth() / dest.getWidth();
- xdiff = scale(x, scalex) - sourcex;
- x1 = Math.min(source.getWidth() - 1, sourcex + 1);
- y1 = Math.min(source.getHeight() - 1, sourcey + 1);
- rgb1 = getRGBInterpolation(source.getRGB(sourcex, sourcey), source.getRGB(x1, sourcey),
- xdiff);
- rgb2 = getRGBInterpolation(source.getRGB(sourcex, y1), source.getRGB(x1, y1), xdiff);
- rgb = getRGBInterpolation(rgb1, rgb2, ydiff);
- dest.setRGB(x, y, rgb);
- }
- }
- return dest;
- }
- private static double scale(int point, double scale) {
- return point / scale;
- }
- private static int getRGBInterpolation(int value1, int value2, double distance) {
- int alpha1 = (value1 & 0xFF000000) >>> 24;
- int red1 = (value1 & 0x00FF0000) >> 16;
- int green1 = (value1 & 0x0000FF00) >> 8;
- int blue1 = (value1 & 0x000000FF);
- int alpha2 = (value2 & 0xFF000000) >>> 24;
- int red2 = (value2 & 0x00FF0000) >> 16;
- int green2 = (value2 & 0x0000FF00) >> 8;
- int blue2 = (value2 & 0x000000FF);
- int rgb = ((int) (alpha1 * (1.0 - distance) + alpha2 * distance) << 24)
- | ((int) (red1 * (1.0 - distance) + red2 * distance) << 16)
- | ((int) (green1 * (1.0 - distance) + green2 * distance) << 8)
- | (int) (blue1 * (1.0 - distance) + blue2 * distance);
- return rgb;
- }
- /**
- * Determines if the image has transparent pixels.
- *
- * @param image
- * The image to check for transparent pixel.s
- * @return <code>true</code> of <code>false</code>, according to the result
- */
- public static boolean hasAlpha(Image image) {
- try {
- PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
- pg.grabPixels();
- return pg.getColorModel().hasAlpha();
- } catch (InterruptedException e) {
- return false;
- }
- }
- }
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