java - 如何使用 swing 加快图像的放大/缩小？

Question

如何减少图片放大缩小的开销。

这是我的代码，放大/缩小图像需要很长时间...

@Override
public void mouseWheelMoved(MouseWheelEvent e) {
    int myX = 0;
    int myY = 0;

    if (e.getScrollType() == MouseWheelEvent.WHEEL_UNIT_SCROLL) {
        try {
            float amount = e.getWheelRotation() * 5f;
            myX = (int) (label.getWidth() + amount);
            myY = (int) (label.getHeight() + amount);
            imgX = myX;
            imgY = myY;
            label.setSize(myX, myY);
            scalledItemImage = itemImage.getScaledInstance(imgX, imgY,
                    BufferedImage.TYPE_INT_ARGB);
            ImageIcon icon = new ImageIcon(scalledItemImage);
            label.setIcon(icon);
            repaint();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

如何以预期的图像分辨率和清晰度加速图像渲染。

Answer 1

你以错误的方式调用了 scale 方法....

• BufferedImage.TYPE_ARGB = 6; http://docs.oracle.com/javase/7/docs/api/constant-values.html#java.awt.image.BufferedImage.TYPE_4BYTE_ABGR
• Image.SCALE_FAST = 2; http://docs.oracle.com/javase/7/docs/api/constant-values.html#java.awt.Image.SCALE_FAST

尝试调用:

scalledItemImage = itemImage.getScaledInstance(imgX, imgY,
                BufferedImage.SCALE_FAST);

(如上所述)