java - 翻转和旋转图像。仿射变换在 java 中无法正常工作

Question

嘿，我实现了旋转和翻转图像的代码。

• 向左、向右、上下颠倒旋转均有效。
• 水平翻转、垂直翻转都有效。
• 但他们不一起工作

当我翻转图像然后旋转时，它就会消失。

但是

当我翻转和翻转图像时(所以它与翻转之前一样)，我可以正常旋转。

<小时/>

我尝试理解出了什么问题，我认为问题在于变换或缩放。

您知道如何修复此代码吗？

/**
 * Paint the icons of this compound icon at the specified location
 * 
 * @param c
 *            The component on which the icon is painted
 * @param g
 *            the graphics context
 * @param x
 *            the X coordinate of the icon's top-left corner
 * @param y
 *            the Y coordinate of the icon's top-left corner
 */
@Override
public void paintIcon(Component c, Graphics g, int x, int y) {
    Graphics2D g2 = (Graphics2D) g.create();

    AffineTransform af = g2.getTransform();
    int cWidth = icon.getIconWidth() / 2;
    int cHeight = icon.getIconHeight() / 2;

    int xAdjustment = (icon.getIconWidth() % 2) == 0 ? 0 : -1;
    int yAdjustment = (icon.getIconHeight() % 2) == 0 ? 0 : -1;

    if (rotate == Rotate.DOWN) {

        g2.translate(x + cHeight, y + cWidth);
        g2.rotate(Math.toRadians(90));
        icon.paintIcon(c, g2, -cWidth, yAdjustment - cHeight);

    } else if (rotate == Rotate.UP) {

        g2.translate(x + cHeight, y + cWidth);
        g2.rotate(Math.toRadians(-90));
        icon.paintIcon(c, g2, xAdjustment - cWidth, -cHeight);

    } else if (rotate == Rotate.UPSIDE_DOWN) {

        g2.translate(x + cWidth, y + cHeight);
        g2.rotate(Math.toRadians(180));
        icon.paintIcon(c, g2, xAdjustment - cWidth, yAdjustment - cHeight);

    } else if (rotate == Rotate.VERTICAL) { 

         g2.translate(0, getIconHeight());  
         g2.scale(1, -1); 

         icon.paintIcon(c, g2, x, y); 
         vert = !vert; //boolean flag

    } else if (rotate == Rotate.HORIZONTAL) {

        g2.translate(getIconWidth(), 0);  
        g2.scale(-1, 1);  
        icon.paintIcon(c, g2, x, y); 
        hor = !hor; //boolean flag

    } else if (rotate == Rotate.VERTICALLY_HORIZONTAL) {

        g2.translate(getIconWidth(), getIconHeight());  
        g2.scale(-1, -1);  
        icon.paintIcon(c, g2, x, y);
        hor = !hor;
        vert = !vert;

    } else if (rotate == Rotate.CENTER) {

        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        AffineTransform original = g2.getTransform();
        AffineTransform at = new AffineTransform();
        at.concatenate(original);
        at.translate((getIconWidth() - icon.getIconWidth()) / 2,
                (getIconHeight() - icon.getIconHeight()) / 2);
        at.rotate(Math.toRadians(angle), x + cWidth, y + cHeight);
        g2.setTransform(at);
        icon.paintIcon(c, g2, x, y);
        g2.setTransform(original);

    }
}

Answer 1

如果您希望它们一起工作，您必须保存通过转换制作的图像。这是一个例子

图像原点 = ...;
图像变换复制 = ...;
仿射变换 at = ...;
TransformedCopy.getGraphics().setTransform(at).drawImage(orig);
//transformedCopy 现在将拥有转换后图像的副本