如何通过Java动态调整绘图区域的大小？

Question

我正在尝试调整我的 BufferedImage（我的绘图区域）的大小，而不会丢失图像上绘制的图形并在调整大小后恢复绘制。（就像在 Paint .NET）我正在使用 JSplitPane 从边缘执行此操作并且它正在发生，但是当我想继续绘制时，光标（笔）距离绘制的图形（形状）大约 3 厘米，因为数字与图像一起成长。当我删除整个图片时，它会变得更好。 和

我查看了 Google 和 StackoverFlow 中的答案，但它对我不起作用。我该如何解决这个问题？

到目前为止我尝试过这样的：

类用户界面

jSplitPane.addPropertyChangeListener(JSplitPane.DIVIDER_LOCATION_PROPERTY, (PropertyChangeEvent evt) -> { double imageHeight = jSplitPane.getDividerLocation(); double imageWidth = imageHeight * 1.6; top.setDividerLocation((int) imageWidth); drawGround.changeImageSizeDynmcally((int) imageWidth, (int) imageHeight); drawGround.repaint(); });

类 DrawGround

     BufferedImage masterImage = new BufferedImage(AREA_WIDTH, AREA_HEIGHT, BufferedImage.TYPE_INT_ARGB);
    //image is master image drawing at first time.

    public void changeImageSizeDynmcally(int w, int h) {
      AREA_WIDTH = w;
      AREA_HEIGHT = h;
      repaint();

      BufferedImage scaledImage = new BufferedImage(AREA_WIDTH, AREA_HEIGHT, BufferedImage.TYPE_INT_ARGB);
      Graphics2D g2D = scaledImage.createGraphics();
      g2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
            RenderingHints.VALUE_INTERPOLATION_BILINEAR);
      g2D.drawImage(masterImage, 0, 0, null);
      g2D.dispose();
}

在这个方法之后我有

     `@Override
 protected void paintComponent(Graphics g) {
     super.paintComponent(g);
        if (masterImage != null) {
            g2D = (Graphics2D) masterImage.getGraphics();
            g2D.setComposite(AlphaComposite.Src); 
            bla,bla,bla`

Answer 1

我通过创建新方法来设置图像解决了这个问题：

public void changeImageSizeDynmcally(int x, int y) {

    AREA_WIDTH = x;
    AREA_HEIGHT = y;
    repaint();

    scaledImage = new BufferedImage(AREA_WIDTH, AREA_HEIGHT, BufferedImage.TYPE_INT_ARGB);
    Graphics2D g2D = scaledImage.createGraphics();
    g2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
            RenderingHints.VALUE_INTERPOLATION_BILINEAR);
    g2D.drawImage(image,0,0, null);

    g2D.dispose();
    setImage(scaledImage); //this is a new method!
}`

新方法是：

public void setImage(BufferedImage img) { if (img != null) { g2D = (Graphics2D) img.getGraphics(); g2D.setComposite(AlphaComposite.Src); g2D.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY); g2D.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY); g2D.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE); g2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2D.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB); masterImage = img; repaint(); } } 就像将新图像分配给旧图像一样。