package com.eumji.zblog.util;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.color.ColorSpace;
import java.awt.image.*;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
/**
* Created by eumji on 17-5-31.
*/
public class ImageCutUtil {
/**
* 图像切割(改) *
*
* @param srcImageFile 源图像地址
* @param dirImageFile 新图像地址
* @param x 目标切片起点x坐标
* @param y 目标切片起点y坐标
* @param destWidth 目标切片宽度
* @param destHeight 目标切片高度
*/
public static void abscut(String srcImageFile, String dirImageFile, int x, int y, int destWidth,
int destHeight) {
try {
Image img;
ImageFilter cropFilter;
// 读取源图像
BufferedImage bi = ImageIO.read(new File(srcImageFile));
int srcWidth = bi.getWidth(); // 源图宽度
int srcHeight = bi.getHeight(); // 源图高度
if (srcWidth >= destWidth && srcHeight >= destHeight) {
Image image = bi.getScaledInstance(srcWidth, srcHeight,
Image.SCALE_DEFAULT);
// 改进的想法:是否可用多线程加快切割速度
// 四个参数分别为图像起点坐标和宽高
// 即: CropImageFilter(int x,int y,int width,int height)
cropFilter = new CropImageFilter(x, y, destWidth, destHeight);
img = Toolkit.getDefaultToolkit().createImage(
new FilteredImageSource(image.getSource(), cropFilter));
BufferedImage tag = new BufferedImage(destWidth, destHeight,
BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0, 0, null); // 绘制缩小后的图
g.dispose();
// 输出为文件
ImageIO.write(tag, "JPEG", new File(dirImageFile));
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void cut(InputStream is, File dirImageFile, int x, int y, int destWidth,
int destHeight) throws IOException {
cut(ImageIO.read(is), dirImageFile, x, y, destWidth, destHeight);
}
public static void cut(BufferedImage bi, File dirImageFile, int x, int y, int destWidth,
int destHeight) {
try {
Image img;
ImageFilter cropFilter;
// 读取源图像
int srcWidth = bi.getWidth(); // 源图宽度
int srcHeight = bi.getHeight(); // 源图高度
if (srcWidth >= destWidth && srcHeight >= destHeight) {
Image image = bi.getScaledInstance(srcWidth, srcHeight,
Image.SCALE_DEFAULT);
// 改进的想法:是否可用多线程加快切割速度
// 四个参数分别为图像起点坐标和宽高
// 即: CropImageFilter(int x,int y,int width,int height)
cropFilter = new CropImageFilter(x, y, destWidth, destHeight);
img = Toolkit.getDefaultToolkit().createImage(
new FilteredImageSource(image.getSource(), cropFilter));
BufferedImage tag = new BufferedImage(destWidth, destHeight,
BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0, 0, null); // 绘制缩小后的图
g.dispose();
// 输出为文件
ImageIO.write(tag, "JPEG", dirImageFile);
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 缩放图像
*
* @param srcImageFile 源图像文件地址
* @param result 缩放后的图像地址
* @param scale 缩放比例
* @param flag 缩放选择:true 放大; false 缩小;
*/
public static void scale(String srcImageFile, String result, int scale,
boolean flag) {
try {
BufferedImage src = ImageIO.read(new File(srcImageFile)); // 读入文件
int width = src.getWidth(); // 得到源图宽
int height = src.getHeight(); // 得到源图长
if (flag) {
// 放大
width = width * scale;
height = height * scale;
} else {
// 缩小
width = width / scale;
height = height / scale;
}
Image image = src.getScaledInstance(width, height, Image.SCALE_DEFAULT);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(image, 0, 0, null); // 绘制缩小后的图
g.dispose();
ImageIO.write(tag, "JPEG", new File(result));// 输出到文件流
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 重新生成按指定宽度和高度的图像
*
* @param srcImageFile 源图像文件地址
* @param result 新的图像地址
* @param _width 设置新的图像宽度
* @param _height 设置新的图像高度
*/
public static void scale(String srcImageFile, String result, int _width, int _height) {
scale(srcImageFile, result, _width, _height, 0, 0);
}
public static void scale(String srcImageFile, String result, int _width, int _height, int x, int y) {
try {
BufferedImage src = ImageIO.read(new File(srcImageFile)); // 读入文件
int width = src.getWidth(); // 得到源图宽
int height = src.getHeight(); // 得到源图长
if (width > _width) {
width = _width;
}
if (height > _height) {
height = _height;
}
Image image = src.getScaledInstance(width, height, Image.SCALE_DEFAULT);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(image, x, y, null); // 绘制缩小后的图
g.dispose();
ImageIO.write(tag, "JPEG", new File(result));// 输出到文件流
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 图像类型转换 GIF->JPG GIF->PNG PNG->JPG PNG->GIF(X)
*/
public static void convert(String source, String result) {
try {
File f = new File(source);
f.canRead();
f.canWrite();
BufferedImage src = ImageIO.read(f);
ImageIO.write(src, "JPG", new File(result));
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 彩色转为黑白
*
* @param source
* @param result
*/
public static void gray(String source, String result) {
try {
BufferedImage src = ImageIO.read(new File(source));
ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
ColorConvertOp op = new ColorConvertOp(cs, null);
src = op.filter(src, null);
ImageIO.write(src, "JPEG", new File(result));
} catch (IOException e) {
e.printStackTrace();
}
}
}