Java：旋转图像 [英] Java: Rotating Images

问题描述

我需要能够单独旋转图像（在java中）。到目前为止，我唯一发现的是g2d.drawImage（image，affinetransform，ImageObserver）。不幸的是，我需要在特定的点绘制图像，并且没有方法可以分别对图像进行旋转，并且2.允许我设置x和y。任何帮助表示赞赏

I need to be able to rotate images individually(in java). The only thing I have found so far is g2d.drawImage(image, affinetransform, ImageObserver ). Unfortunately, I need to draw the image at a specific point, and there is no method with an argument that 1.rotates the image separately and 2. allows me to set the x and y. any help is appreciated

推荐答案

这就是你可以做到的。此代码假定存在称为图像的缓冲图像（如您的评论所示）

This is how you can do it. This code assumes the existance of a buffered image called 'image' (like your comment says)

// The required drawing location
int drawLocationX = 300;
int drawLocationY = 300;

// Rotation information

double rotationRequired = Math.toRadians (45);
double locationX = image.getWidth() / 2;
double locationY = image.getHeight() / 2;
AffineTransform tx = AffineTransform.getRotateInstance(rotationRequired, locationX, locationY);
AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_BILINEAR);

// Drawing the rotated image at the required drawing locations
g2d.drawImage(op.filter(image, null), drawLocationX, drawLocationY, null);

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