我需要能夠單獨旋轉圖像（在Java中）。到目前為止，我發現的唯一東西是g2d.drawImage（image，affinetransform，ImageObserver）。不幸的是，我需要在特定點繪制圖像，并且沒有一種方法帶有參數1.分別旋轉圖像和2.允許我設置x和y。任何幫助表示贊賞
3 回答
萬千封印
TA貢獻1891條經驗 獲得超3個贊
這就是您可以做到的。這段代碼假設存在一個名為“ image”的緩沖圖像（如您的評論所說）
// 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);
米琪卡哇伊
TA貢獻1998條經驗 獲得超6個贊
一種簡單的方法，而無需使用如此復雜的draw語句：
//Make a backup so that we can reset our graphics object after using it.
AffineTransform backup = g2d.getTransform();
//rx is the x coordinate for rotation, ry is the y coordinate for rotation, and angle
//is the angle to rotate the image. If you want to rotate around the center of an image,
//use the image's center x and y coordinates for rx and ry.
AffineTransform a = AffineTransform.getRotateInstance(angle, rx, ry);
//Set our Graphics2D object to the transform
g2d.setTransform(a);
//Draw our image like normal
g2d.drawImage(image, x, y, null);
//Reset our graphics object so we can draw with it again.
g2d.setTransform(backup);
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