Java编写png文件使一切透明

Question

我当前正在尝试将 BufferedImage 保存到 png 文件:

for(int x = left.getBlockX(); x < (left.getBlockX() + height); x++){
                for(int z = left.getBlockZ(); z < (left.getBlockZ() + width); z++){
                    pixels[i] = getBasicColor(new Location(left.getWorld(), x, left.getBlockY(), z));
                    i++;
                }
            }

这是 getBasicColor 函数:

@SuppressWarnings("deprecation")
public static int getBasicColor(Location location){
    if(location.getBlock().getType().equals(Material.WOOL)){
        Byte data = location.getBlock().getData();
        for(BasicColor basicColor : BasicColor.values()){   
            if(data.equals(basicColor.getDyeColor().getData())){
                int rgb = 65536 * basicColor.getRed() + 256 * basicColor.getGreen() + basicColor.getBlue();
                System.out.println(rgb);
                return rgb;
            }
        }
    }
    return 0;
}

这是基本颜色:

public enum BasicColor {

WHITE (255,255,255, DyeColor.WHITE),
BLACK (0,0,0, DyeColor.BLACK),
BLUE (0,0,255, DyeColor.BLUE),
CYAN (0, 255, 255, DyeColor.CYAN),
DARK_GRAY (169,169,169, DyeColor.GRAY),
GRAY (128,128,128, DyeColor.GRAY),
SILVER (192,192,192, DyeColor.SILVER),
GREEN (0,128,0, DyeColor.GREEN),
MAGENTA (255,0,255, DyeColor.MAGENTA),
ORANGE (255, 165, 0, DyeColor.ORANGE),
PINK (255,192,203, DyeColor.PINK),
RED (255, 0, 0, DyeColor.RED),
YELLOW (255,255,0, DyeColor.YELLOW);

private final int red, blue, green;
private final DyeColor color;

private BasicColor(int red, int green, int blue, DyeColor color){
    this.red = red;
    this.green = green;
    this.blue = blue;
    this.color = color;
}

public Integer getRed(){
    return red;
}

public Integer getBlue(){
    return blue;
}

public Integer getGreen(){
    return green;
}

public DyeColor getDyeColor(){
    return color;
}

}

每当我尝试使用以下代码保存文件时:

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
            WritableRaster raster = (WritableRaster) image.getData();
            raster.setPixels(0, 0, width, height, pixels);
            image.setData(raster);
            try {
                ImageIO.write(image, "png", new File(name));
            } catch (IOException e) {
                e.printStackTrace();
            }

我遇到了问题，因为我没有得到正确的颜色，而是得到了高度透明的颜色或根本没有颜色。

感谢您的帮助，

卢卡斯

Answer 1

假设像素设置正确，请使用:

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
image.setRGB(0, 0, width, height, pixels, 0, width);

检查像素是否符合您想要在某个组件中绘制图像的效果。如果看起来不太好，则说明您的颜色存在问题。打印出 basicColor.getRed() 等看看它们是否正确。