Question

我有一个方法，它接受一个字符串和一个整数作为参数。该方法基本上返回原始图像的较小裁剪部分。字符串是路径和我在switch语句中使用的整数，我需要的特定部分，我已经尝试打印输出但是无论出于什么原因x和y保持在0，即使我知道我得到的高度值和宽度。

    private  Icon extractIcon(String path, int i){
    // reads the image into a BufferedImage object
    BufferedImage image=null;
    try{
        image = ImageIO.read(new File(path));
    }
    catch(IOException e){
        System.err.println("Image not found");
        System.exit(1);
    }
    height = image.getHeight();
    width = image.getWidth();
    // allocates another BufferedImage object whose size is
    // the same as the one of the wanted icon
    BufferedImage part = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR);

    switch(i){
    case 1:
        x = 0;
        y = 0;
        break;
    case 2:
        x = width*(1/3);
        y = 0;
        break;
    case 3:
        x = width*(2/3);
        y = 0;
        break;
    case 4:
        x = 0;
        y = height*(1/3);
        break;
    case 5:
        x=width*(1/3);
        y=height*(1/3);
        break;
    case 6:
        x=width*(2/3);
        y=height*(1/3);
        break;
    case 7:
        x = 0;
        y=height*(2/3);
        break;
    case 8:
        x = width*(1/3);
        y = height*(2/3);
        break;
    }

    //Intializes leftTopX and leftTopY for each button after switch
    leftTopX = width*(1/3)+x;
    leftTopY = height*(1/3)+y;

    // copies the data from "image" to "part"
    System.out.println(x + " xy " + y);
    System.out.println(leftTopY + " leftxy " + leftTopX);
    for(;x<width;x++){
        for(;y<height;y++){
            part.setRGB(x,y, image.getRGB(x+leftTopX, y+leftTopY));
        }
    }

    // creates an icon whose content is already in "part"
    ImageIcon icon = new ImageIcon();
    icon.setImage(part);

    // returns to the caller
    return icon;
}

Answer 1

您的交换机案例中缺少中断。

另请记住为您的帖子添加标签，用于您正在使用的语言。

Answer 2

你做整数除法......

x = width*(1/3);
y = 0;

1/3等于0

您应尝试使用float或double作为除数......

x = width*(1/3f);

或

x = (int)(width*(1/3.0));

例如......

返回图标不工作的方法

2 个答案: