如何随机填充网格框中的颜色 [英] How to fill color in grid boxes randomly

问题描述

而不是按照图中所示顺序排列：

网格http://www.freeimagehosting.net/uploads/4ed76557de.jpg

  public class grid extends JPanel {
 Label one = new Label（）; 
 Label two = new Label（）; 
 Label three = new Label（）; 
标签四=新标签（）; 
 
 public static void main（String [] args）{
 JFrame jf = new JFrame（）; 
 jf.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 jf.add（new YAnswers（））; 
 jf.pack（）; 
 jf.setVisible（true）; 
} 
 
 grid（）{
 int rows = 10; int cols = 10; 
 setLayout（new GridLayout（rows，cols））; 
 add（one）; one.setBackground（Color.red）; 
 add（two）; two.setBackground（Color.orange）; 
 add（three）; three.setBackground（Color.green）; 
 add（四）; four.setBackground（Color.black）; 
 boxes [] bx =新盒子[rows * cols]; 
 
 for（int i = 0; i  System.out.println（i+ i）; 
 bx [i] = new boxes（）; 
 if（i％2< 1）
 bx [i] .setColor（1）; 
 add（bx [i]）; 
} 
} // end grid（）
} 
  

解决方案

您可以使用 Math.random 获取随机颜色：

<$ p （float）Math.random（），（float）Math.random（），（float）Math.random（））; $ p>


BTW：类名以大写字母开头，所以使用 Grid 而不是 grid 。

---

编辑

以下代码使用 GridBagLayout 以产生此结果：

替代文字http://img214.imageshack.us/img214/ 5426 / so2374295.png

  public Grid（）
 {
 final颜色BACKGROUND = Color.LIGHT_GRAY; 
 final Color [] colors = new Color [] 
 {Color.BLACK，Color.BLACK，Color.BLUE，Color.BLUE}; 
 
 final int ROWS = 10; 
 final int COLS = 10; 
 
 setBackground（Color.BLACK）; 
 setLayout（new GridBagLayout（））; 
 
标签[] []标签=新标签[ROWS] [COLS]; 
 
 GridBagConstraints gc = new GridBagConstraints（）; 
 gc.weightx = 1d; 
 gc.weighty = 1d; 
 gc.insets = new Insets（0，0，1，1）; 
 gc.fill = GridBagConstraints.BOTH; 
 
 //为整个面板填充标签
 for（int r = 0; r  for（int c = 0; c< COLS; c ++ ）{
标签l =新标签（）; 
 l.setBackground（BACKGROUND）; 
 gc.gridx = r; 
 gc.gridy = c; 
 add（l，gc）; 
 label [r] [c] = l; 
 
 
 
 //现在在背景
中为（Color col：colors）{
 int r，c ; 
 do {//确保找到唯一字段
 r =（int）Math.floor（Math.random（）* ROWS）; 
 c =（int）Math.floor（Math.random（）* COLS）; 
} while（！label [r] [c] .getBackground（）。equals（BACKGROUND））; 
 label [r] [c] .setBackground（col）; 
} 
} 
  

How can I fill color on the grid boxes randomly?

Rather than orderly as shown in picture here:

Grid http://www.freeimagehosting.net/uploads/4ed76557de.jpg

public class grid extends JPanel{
    Label one = new Label();
    Label two = new Label();
    Label three = new Label();
    Label four = new Label();

    public static void main(String[] args){
        JFrame jf=new JFrame();
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.add(new YAnswers());
        jf.pack();
        jf.setVisible(true);
    }

    grid (){
       int rows=10; int cols=10;
       setLayout(new GridLayout(rows,cols));
       add(one); one.setBackground(Color.red);
       add(two); two.setBackground(Color.orange);
       add(three); three.setBackground(Color.green);
       add(four); four.setBackground(Color.black);
       boxes[] bx=new boxes[rows*cols];

        for(int i=0;i<rows*cols;i++){
            System.out.println("i"+i);
            bx[i]=new boxes();
            if(i%2<1)
                bx[i].setColor(1);
            add(bx[i]);
        }
    } //end grid()
}

解决方案

You can get a random color by using Math.random:

new Color( (float)Math.random(), (float)Math.random(), (float)Math.random() );

BTW: Class-names start with upper-case in Java, so use Grid instead of grid.

---

EDIT

The following code uses GridBagLayout to produce this result:

alt text http://img214.imageshack.us/img214/5426/so2374295.png

public Grid ()
{
    final Color BACKGROUND = Color.LIGHT_GRAY;
    final Color[] colors = new Color[]
        {Color.BLACK, Color.BLACK, Color.BLUE, Color.BLUE};

    final int ROWS=10;
    final int COLS=10;

    setBackground(Color.BLACK);
    setLayout(new GridBagLayout());

    Label[][] label = new Label[ROWS][COLS];

    GridBagConstraints gc = new GridBagConstraints();
    gc.weightx = 1d;
    gc.weighty = 1d;
    gc.insets = new Insets(0, 0, 1, 1);
    gc.fill = GridBagConstraints.BOTH;

    // fill the whole panel with labels
    for( int r=0 ; r<ROWS ; r++) {
        for( int c=0 ; c<COLS ; c++) {
            Label l = new Label();
            l.setBackground(BACKGROUND);
            gc.gridx = r;
            gc.gridy = c;
            add(l, gc);
            label[r][c] = l;
        }
    }

    // now find random fields for the colors defined in BACKGROUND
    for(Color col : colors) {
        int r, c;
        do { // make sure to find unique fields
            r = (int)Math.floor(Math.random() * ROWS);
            c = (int)Math.floor(Math.random() * COLS);
        } while(!label[r][c].getBackground().equals(BACKGROUND));
        label[r][c].setBackground(col);
    }
}

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