Question

我需要帮助改变网格中矩形的颜色。到目前为止，我有矩形和网格（这是绘制分隔矩形的线条），我想在单击时更改单个矩形的颜色。

我在颜色应该改变的循环中添加了“System.out.println（”Something“）”行，它总是返回“Something”。这就是为什么我很困惑。感谢您的帮助！

类网格：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.ArrayList;
import javax.swing.Timer;
import javax.swing.JFrame;
import javax.swing.JPanel;

 public class Grid extends JPanel{

private int a = 50;
private int b = 50;
private Lifeform[][] Life;
private boolean[][]life = new boolean[a][b];
private Timer t;

Grid(){
//creates grid of rectangles
    Life = new Lifeform[a][b];

    int ypos = 0;
    for(int i = 0; i < Life.length; i++){
        int xpos = 0;
        for(int j = 0; j < Life[0].length; j++){

            Rectangle r = new Lifeform();
            r.setBounds(xpos, ypos, 50, 50);
            Life[i][j] = (Lifeform) r;
            xpos += 50;
        }
        ypos += 50;
    }
    t = new Timer(64, new Movement());
    this.addMouseListener(new mouse());
}

public void paintComponent(Graphics g){

    for(Lifeform[] n : Life){
//makes rectangles white
        g.fillRect(this.getX(), this.getY(), this.getWidth(), this.getHeight());
        g.setColor(Color.white);
    }
    for (int i = 0; i <= 25; i++){
        g.drawLine(0, 50*i, 1500, 50*i);
        g.setColor(Color.black);
    }
    for (int i = 0; i <= 25; i++){
        g.drawLine(50*i, 0, 50*i, 750);
        g.setColor(Color.black);
    }
}

private JFrame createGrid(){

    JFrame frame = new JFrame("Alveolate");
    frame.add(this);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(700,700);
    frame.setVisible(true);     
    return frame;
}

public class mouse implements MouseListener{
//colors rectangles (it doesn't work)
    public void mouseClicked(MouseEvent e) {
        Point p = new Point(e.getX(),e.getY());
        for(int i = 0; i < Life.length; i++){
            for(int j = 0; j < Life[i].length; j++){
                Lifeform spot = Life[i][j];

                if (spot.contains(p)){
                    spot.setColor(Color.red);
                    System.out.println("Something");

                }
            }

        }   

    }

    public void mousePressed(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}       
    public void mouseExited(MouseEvent e) {}

}

public class Movement implements ActionListener{
    public void actionPerformed ( ActionEvent e ){

        for (int i = 0; i < Life.length; i++){
            for (int j = 0; j < Life[i].length; j++){
                if(Life[i][j].getColor().equals(Color.black)){
                    life[i][j] = true;
                }
                else{
                    life[i][j] = false;
                }

            }       

        }

        repaint();

    }

}

public void startTimer(){
    t.start();
}

public void stopTimer(){
    t.stop();
}

public static void main(String[] args) {

    Grid ABC = new Grid();
    ABC.createGrid();
    ABC.startTimer();
}
}

Class Lifeform：

import java.awt.Color; import java.awt.Rectangle;

public class Lifeform extends Rectangle {
    private Color c;
    public Lifeform() {
        c = Color.WHITE;
    }
    public Color getColor() {
        return c;
    }

    public boolean setColor( Color c ) {
        boolean rtn = false;
        if( c != null ) {
            this.c = c;
            rtn = true;
        }

        return rtn;
    }

    }

Answer 1

试试这个：

for(int i = 0; i < 50; i++){
   for(int j = 0; j < 50; j++){
    ....  

   }
}

Answer 2

试

for(Lifeform[] n : Life){
    for(Lifeform lf : n){
        g.setColor(lf.getColor());
        g.fillRect((int)lf.getX(), (int)lf.getY(), (int)lf.getWidth(), (int)lf.getHeight());
    }
}

在paintComponent方法中

Answer 3

没有阅读所有代码，但似乎你肯定将Lifeform的颜色设置为红色。这意味着您的渲染代码实际上从未使用此事实来显示Lifeform。看起来你唯一一次绘制矩形是在paintComponent中。每次想要重绘时都需要调用此画图。您可以在JFrame或JPanel上使用重绘来实现此目的。此外，你在那里的渲染代码似乎只显示白色矩形

url(r'^accounts/login/$')

这是在你的Lifeform [] []循环中。相反，你应该有一个双循环来获得每个Lifeform并使用x和y以及颜色来绘制。类似的东西：

g.fillRect(this.getX(), this.getY(), this.getWidth(), this.getHeight());
g.setColor(Color.white);

此外，生命应该用小写的'l'命名。看到没有惯例的名字会让人感到困惑。

更改网格中矩形的颜色

3 个答案: