多维数组如何在java中对角反射图像

Question

我有以下代码，以便以对角线方式反映图像：

public void mirrorDiagonal() {

      Pixel[][] pixels = this.getPixels2D();

      Pixel topRightPixel = null;
      Pixel bottomLeftPixel = null;
      int maxLength;
      if (pixels.length < pixels[0].length) { maxLength = pixels.length; }
      else {maxLength = pixels[0].length; }

      for (int row = 0; row < maxLength; row++)
      {
          for (int col = row; col < maxLength; col++)
          {
              topRightPixel = pixels[row][col];
              bottomLeftPixel = pixels[col][row];
              bottomLeftPixel.setColor(topRightPixel.getColor());
          }
      }
  }

然而，我在某个地方搞砸了，它从图像的右上角反射到左下角

我的问题是：我将如何以其他方式反映它？（更具体地说，从左上到右下）

Answer 1

看起来你认为是右上角的像素实际上是左上角。请尝试以下方法：

for (int row = 0; row < maxLength; row++) {
    for (int col = maxLength - row - 1; col >= 0; col ) {
        topRightPixel = pixels[row][col];
        bottomLeftPixel = pixels[col][row];
        bottomLeftPixel.setColor(topRightPixel.getColor());
    }
}

Answer 2

你为什么要改变颜色？你可以移动像素对象。此外，如果定义了3种基本转换，则可以通过以不同方式组合前3种来构造所有其他转换。 e、 g

static void mirrorHor(Pixel[][] pixels) {
  for(int row = 0; row < pixels.length; row++) {
    for(int col = 0; col + col < pixels[row].length - 1; col++) {
      Pixel p = pixels[row][col];
      pixels[row][col] = pixels[row][pixels[row].length - col - 1];
      pixels[row][pixels[row].length - col - 1] = p;
    }
  }
}

static void mirrorVert(Pixel[][] pixels) {
  for(int row = 0; row + row < pixels.length - 1; row++) {
    Pixel[] r = pixels[row];
    pixels[row] = pixels[pixels.length - row - 1];
    pixels[pixels.length - row - 1] = r;
  }
}

static void mirrorTopRightBottomLeft(Pixel[][] pixels) {
  for(int row = 0; row < pixels.length - 1; row++) {
    for(int col = row + 1; col < pixels.length; col++) {
      Pixel p = pixels[row][col];
      pixels[row][col] = pixels[col][row];
      pixels[col][row] = p;
    }
  }
}

static void rotate180(Pixel[][] pixels) {
  mirrorHor(pixels);
  mirrorVert(pixels);
}

static void mirrorTopLeftBottomRight(Pixel[][] pixels) {
  mirrorTopRightBottomLeft(pixels);
  rotate180(pixels);
}

static void rotateLeft90(Pixel[][] pixels) {
  mirrorTopRightBottomLeft(pixels);
  mirrorVert(pixels);
}

static void rotateRight90(Pixel[][] pixels) {
  mirrorTopRightBottomLeft(pixels);
  mirrorHor(pixels);
}