java - 适合面板中导入的图像

Question

我尝试通过 JFileChooser 将图像导入 JPanel。有效。但我需要在不丢失纵横比或比例的情况下使图像适合面板。

我尝试重新缩放图像，这是我的代码:

Image img = Toolkit.getDefaultToolkit().createImage(picture.getSource());
Image scaledImage = img.getScaledInstance(jPanel1.getWidth(),jPanel1.getHeight(),Image.SCALE_SMOOTH);

g2.drawImage(scaledImage, 0, 0,null,null);

却无法保住它的比例。为此，我需要一个简单的代码。

Answer 1

尝试阅读 the instructions :

If either width or height is a negative number then a value is substituted to maintain the aspect ratio of the original image dimensions. If both width and height are negative, then the original image dimensions are used.