JPanel绘制曲线出现像素拉伸锯齿化的问题排查与解决

我尝试在宽高为800的JPanel中绘制平滑曲线，但部分像素出现拉伸，导致曲线呈现锯齿化效果。调试时打印的像素数组显示正常，生成的BufferedImage本身也无拉伸问题，但在JPanel中绘制时该现象出现。我发现grf.drawRoundRect(50, 50, 400, 400, 200, 200)可实现平滑效果，但希望通过像素数组实现该功能。

相关代码如下：

public void draw(){
  Graphics grf = screen.get_graphics();
  int width = 400;
  int height = 400;
  int scale = 1;
  BufferedImage red_fill = BufferedImageFactory.fill(width, height, Color.RED);
  Matrixi2d square_mask = new Soft_Square().get_filled_in_mask(width, height);
  BufferedImage hue_soft_square = square_mask.mask_image(red_fill);
  grf.drawImage(hue_soft_square, 50, 50, null);
}

public BufferedImage mask_image(BufferedImage input){
  //BufferedImage result = new BufferedImage(width + edge*2, height + edge*2, BufferedImage.TYPE_INT_ARGB);
  BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
  //for(int x = edge, mask_x = 0; x < width; x++, mask_x++){
    //for(int y = edge, mask_y = 0; y < height; y++, mask_y++){
  for(int x = 0, mask_x = 0; x < width; x++, mask_x++){
    for(int y = 0, mask_y = 0; y < height; y++, mask_y++){
      if(get(mask_x, mask_y) != 0){
        int mask_alpha = get(mask_x, mask_y);
        int color = input.getRGB(x, y);
        int red = (0xFF & ( color >> 16));
        int alpha = (0xFF & (color >> 24));
        int blue = (0xFF & (color >> 0 ));
        int green = (0xFF & (color >> 8 ));
        //System.out.println("mask value: "+get(mask_x, mask_y));
        //System.out.println("initial alpha: " + alpha);
        alpha = (int)(alpha * mask_alpha / 255.0);
        int sum = ((alpha & 0xff) << 24 | (red & 0xff) << 16 | (blue & 0xff) << 8 | (green & 0xff));
        //System.out.println("alpha: " + alpha);
        //System.out.println("mask alpha: " + mask_alpha);
        result.setRGB(x, y, sum);
        //System.out.println("setting result: "+sum);
      }
    }
  }
  return result;
}

最终通过启用绘图时的抗锯齿渲染解决了该问题。

内容的提问来源于stack exchange，提问作者Tyler