java图片基本操作-缩放，旋转，镜像，拼接
- 2026-06-27 01:36:20
java图片基本操作-缩放，旋转，镜像，拼接
/**
* 缩放
*/
public static void zoomByScale(BufferedImage bufImage, double scale) throws IOException {
//获取缩放后的长和宽
int _width = (int) (scale * bufImage.getWidth());
int _height = (int) (scale * bufImage.getHeight());
//获取缩放后的Image对象
Image _img = bufImage.getScaledInstance(_width, _height, Image.SCALE_DEFAULT);
//新建一个和Image对象相同大小的画布
BufferedImage image = new BufferedImage(_width, _height, BufferedImage.TYPE_INT_RGB);
//获取画笔
Graphics2D graphics = image.createGraphics();
//将Image对象画在画布上,最后一个参数,ImageObserver:接收有关 Image 信息通知的异步更新接口,没用到直接传空
graphics.drawImage(_img, 0, 0, null);
//释放资源
graphics.dispose();
//使用ImageIO的方法进行输出,记得关闭资源
OutputStream out = new FileOutputStream("/Users/sunxianyan/Downloads/缩放.jpg");
ImageIO.write(image, "jpeg", out);
out.close();
}
/**
* 旋转
*/
public static void rotate(BufferedImage bufImage, int degree) throws IOException {
int w = bufImage.getWidth();// 得到图片宽度。
int h = bufImage.getHeight();// 得到图片高度。
int swidth = 0; //旋转后的宽度
int sheight = 0;//旋转后的高度
int x;//原点横坐标
int y;//原点纵坐标
degree = degree %360;
if (degree<0){
degree = 360+degree;
}
double theta = Math.toRadians(degree);
if (degree == 180|| degree ==0||degree==360){
sheight = bufImage.getWidth();
swidth =bufImage.getHeight();
} else if (degree == 90 || degree == 270) {
sheight = bufImage.getWidth();
swidth = bufImage.getHeight();
} else {
swidth = (int) (Math.sqrt(w * w + h * h));
sheight = (int) (Math.sqrt(w * w + h * h));
}
x = (swidth / 2) - (w / 2);// 确定原点坐标
y = (sheight / 2) - (h / 2);
BufferedImage spinImage = new BufferedImage(swidth, sheight,bufImage.getType());
// 设置图片背景颜色
Graphics2D gs = (Graphics2D) spinImage.getGraphics();
gs.setColor(Color.white);
gs.fillRect(0, 0, swidth, sheight);// 以给定颜色绘制旋转后图片的背景
AffineTransform at = new AffineTransform();
at.rotate(theta, swidth / 2, sheight / 2);// 旋转图象
at.translate(x, y);
AffineTransformOp op = new AffineTransformOp(at,
AffineTransformOp.TYPE_BICUBIC);
spinImage = op.filter(bufImage, spinImage);
ImageIO.write(spinImage,"jpeg", new File("/Users/sunxianyan/Downloads/旋转.jpg"));
}
/**
* 裁剪
*/
public static void clip(BufferedImage bufImage) throws IOException {
ImageIO.write(bufImage.getSubimage(0, 0, 100, 100), "JPEG", new File("/Users/sunxianyan/Downloads/裁剪.jpg"));
}
/**
* 镜像
*/
public static void mirror(BufferedImage bufImage) throws IOException {
// 获取图片的宽高
final int width = bufImage.getWidth();
final int height = bufImage.getHeight();
// 读取出图片的所有像素
int[] rgbs = bufImage.getRGB(0, 0, width, height, null, 0, width);
// 对图片的像素矩阵进行水平镜像
for (int row = 0; row < height; row++) {
for (int col = 0; col < width / 2; col++) {
int temp = rgbs[row * width + col];
rgbs[row * width + col] = rgbs[row * width + (width - 1 - col)];
rgbs[row * width + (width - 1 - col)] = temp;
}
}
// 把水平镜像后的像素矩阵设置回 bufImage
bufImage.setRGB(0, 0, width, height, rgbs, 0, width);
ImageIO.write(bufImage, "JPEG", new File("/Users/sunxianyan/Downloads/镜像.jpg"));
}
/**
* 拼接
*/
public static void add() throws IOException {
String fileUrl = "https://static.cdn.longmaosoft.com/00039447dd4fa068e1835148c3d5431e.png";
String filepath = "/Users/sunxianyan/Downloads/223233fmbmgbxrmfwmi3mw.jpg";
BufferedImage bufImage = ImageIO.read(new URL(fileUrl));
BufferedImage addImage = ImageIO.read(new File(filepath));
Graphics2D g2d = (Graphics2D) bufImage.getGraphics().create();
// 绘制图片（如果宽高传的不是图片原本的宽高, 则图片将会适当缩放绘制）
g2d.drawImage(addImage, 50, 50, addImage.getWidth(), addImage.getHeight(),null);
g2d.dispose();
ImageIO.write(bufImage,"jpeg", new File("/Users/sunxianyan/Downloads/拼接.jpg"));
}
posted @
2019-03-26 11:38
yangyuxiaozi
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