Question

我跟着peeskillet并根据他的最后想法改变了我的代码。以下是更改的代码

CriclePanel类

    public class CirclePanel extends JPanel {
    int centerX, centerY, radius;
    Color circle_color;

    public void setCircle(int centerX, int centerY, int radius, Color c) {
        this.centerX = centerX;
        this.centerY = centerY;
        this.radius = radius;
        circle_color = c;
        revalidate();
        repaint();
    }

    protected void paintComponent(Graphics g) {
        System.out.println("Trying to draw circle");
        super.paintComponent(g);
        g.fillOval(centerX, centerY, radius*2, radius*2);
    }
}

网格面板（从调色板添加并自定义构建）

myGridPanel = new JPanel(new GridLayout(8,8));
panels = new CirclePanel[8][8];
    for (int i = 0; i < panels.length; i++) {
        for (int j = 0; j < panels[i].length; j++) {
            CirclePanel panel = new CirclePanel();
            panels[i][j] = panel;
            myGridPanel.add(panel);
        }
    }

尝试添加绘制圆圈：

if(dType==DiceType.blackDice){
            System.err.println("black @"+i+","+j);
            panels[i][j].setCircle(x, y, radius, Color.BLACK);
        }else{
            System.err.println("white @"+i+","+j);
            panels[i][j].setCircle(x, y, radius, Color.WHITE);
        }

但是圈子没有在网格面板上绘制，并且母板上也没有网格＆＃34; myGridPanel＆＃34;。我发现没有调用CirclePanel的paintComponant（）。

输出：http://s25.postimg.org/v8u398dun/no_Gridnd_Circle.png

Answer 1

正如我在评论中提到的那样，你可以Refine your Design不要让每个Circle成为一个小组。这是an example

适合当前设计的另一个选项是在每个圆形面板中都有一个setter，您可以为其传递圆形模型。

public class CirclePanel extends JPanel {
    private Circle circle;

    public void setCircle(Circle cirlce) {
        this.circle = circle;
        repaint();
    }

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        if (circle != null) {
            // get the state from circle and paint
            g.fillOval(circle.getX(), circle.getY(), getWidth(), getHeight());
        }
    }
}

注意：在这种情况下，Circle 不是面板

然后，gridPanel为GridLayout添加CirclePanel并将JPanel gridPanel = new JPanel(new GridLayout(5, 5)); CirclePanel[][] panels = new CirclePanel[5][5]; for (int i = 0; i < panels.length; i++) { for (int j = 0; j < panels[i].length; j++) { CirclePanel panel = new CirclePanel(); panels[i][j] = panel; gridPanels.add(panel); } }添加到其中。

CirclePanel

执行此操作后，gridPanel中将显示空Circle circle = new Circle(...); panels[1][1].setCircle(circle);。然后，当您想在其中一个面板中绘制圆形时，可以执行类似

的操作

Circle

<强>更新

或者现在我想起来，你甚至不需要一个0, 0, getWidth(), getHeight()课程，因为你可以画一个public class CirclePanel extends JPanel { private boolean draw; private Color color; // setter for color // setter for draw protected void paintComponent(Graphics g) { super.paintComponent(g); if (draw) { // get the state from circle and paint g.fillOval(0, 0, getWidth(), getHeight()); } } }的圆圈。你可以简单地设置一个标志来绘制。但是如果你想在圆圈中添加更多状态，那么也许你可以保持一个圆圈类。但如果没有，它可能看起来像

setDraw

使用示例

进行更新

请参阅方法Circle。那是我设置标志的平局或不平局。我在import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.GridLayout; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.SwingUtilities; public class CircleDemo { private static final int GRID_SIZE = 5; private Circle[][] circlePanels = new Circle[GRID_SIZE][GRID_SIZE]; private JPanel gridPanel = new JPanel(new GridLayout(GRID_SIZE, GRID_SIZE)); public CircleDemo() { initCircles(); JFrame f = new JFrame(); f.add(gridPanel); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } private void initCircles() { for (int i = 0; i < circlePanels.length; i++) { for (int j = 0; j < circlePanels[i].length; j++) { Circle circle = new Circle(); circlePanels[i][j] = circle; gridPanel.add(circle); } } } class Circle extends JPanel { private boolean draw = false; private Color color = Color.BLUE; public Circle() { setBorder(BorderFactory.createLineBorder(Color.BLACK, 2)); addMouseListener(new MouseAdapter(){ public void mousePressed(MouseEvent e) { if (isDraw()) { setDraw(false); } else { setDraw(true); } } }); } public boolean isDraw() { return draw; } public void setDraw(boolean draw) { this.draw = draw; repaint(); } public void setColor(Color color) { this.color = color; repaint(); } @Override public Dimension getPreferredSize() { return new Dimension(75, 75); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); if (draw) { g.setColor(color); g.fillOval(0, 0, getWidth(), getHeight()); } } } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable(){ public void run() { new CircleDemo(); } }); } }类的鼠标监听器中调用它，但你可以从任何地方调用它。

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在现有JPanel中绘制圆圈

1 个答案:

使用示例