我试图重新创建catan六角形网格，但是我对applet和swing还是陌生的。我对paint（）的概念不清楚。我发现图形方法drawPolygon必须用于...

Answer 1

用户移动窗口

用户图标化或取消图标化窗口

用户将另一个窗口移到窗口的前面

用户将您的窗口置于最前面
• 用户将鼠标移到您的组件上
• 用户锁定或空白屏幕
• 用户滚动包含小程序的网页
• 用户重新加载包含小程序的网页
• 每秒可能进行多次绘制。或者，它可能仅偶尔发生。

由于您无法控制绘画方法的调用时间，因此只能包含绘图逻辑。如果您从列表中删除值，则在随后调用paint方法时这些值将不可用。

这就是为什么您不能在hexValueList方法中修改placeNumbers列表的原因，因为该方法由drawHexagonalGrid调用，而paint则由该方法调用。

[而不是从hexValueList中删除数字，而是使用列表的iterator()方法对其进行迭代，并将每个迭代的int值作为参数传递给placeNumbers：

private void placeNumbers(Graphics g, Polygon p, boolean flag, int hexValue) {
    int x = p.getBounds().x + 30;
    int y = p.getBounds().y + 50;
    int width = p.getBounds().width / 3;
    int height = p.getBounds().width / 3;
    g.drawOval(x, y, width, height);
    g.setColor(Color.WHITE);
    // g.setColor(new Color((int)(Math.random() * 0x1000000)));
    g.fillOval(x, y, width, height);
    g.setColor(Color.BLACK);
    if (flag) {
        g.drawString("" + hexValue, x + 10, y + 20);
    }
}

private Graphics drawHexagonalGrid() {
    Iterator<Integer> hexValueIterator = hexValueList.iterator();

    System.out.println("Drawing the hexagonal grid");
    Graphics g = getGraphics();
    System.out.println("graphics---->" + g);
    boolean isValidHex = true;
    // row 1 - three grids
    Polygon p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 45),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 20), nPoints);
    //
    g.drawPolygon(p);
    g.setColor(Color.GREEN);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 135),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 20), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.BLUE);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 225),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 20), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.RED);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    // row 2 - four grids
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 0),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 110), nPoints);

    g.drawPolygon(p);
    // System.out.println(Arrays.toString(p.xpoints) + " " +
    // Arrays.toString(p.ypoints));
    g.setColor(Color.GRAY);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 90),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 110), nPoints);

    g.drawPolygon(p);
    // System.out.println(Arrays.toString(p.xpoints) + " " +
    // Arrays.toString(p.ypoints));
    g.setColor(Color.ORANGE);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 180),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 110), nPoints);

    g.drawPolygon(p);
    // System.out.println(Arrays.toString(p.xpoints) + " " +
    // Arrays.toString(p.ypoints));
    g.setColor(Color.YELLOW);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 270),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 110), nPoints);

    g.drawPolygon(p);
    // System.out.println(Arrays.toString(p.xpoints) + " " +
    // Arrays.toString(p.ypoints));
    g.setColor(Color.YELLOW);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    // row 3 - five grids
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT - 45),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 200), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.PINK);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 45),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 200), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.GREEN);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 135),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 200), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.BLACK);
    g.fillPolygon(p);
    placeNumbers(g, p, !isValidHex, 0);
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 225),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 200), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.GRAY);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 315),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 200), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.RED);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    // row 4 - four grids
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 0),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 290), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.GRAY);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 90),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 290), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.RED);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 180),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 290), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.PINK);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 270),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 290), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.GREEN);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    // row 5 - three grids
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 45),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 380), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.YELLOW);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 135),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 380), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.ORANGE);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    p = new Polygon(Utilities.getMoreXPoints(xPoints, HEX_CONSTANT + 225),
            Utilities.getMoreYPoints(yPoints, (HEX_CONSTANT / 9) + 380), nPoints);

    g.drawPolygon(p);
    g.setColor(Color.GRAY);
    g.fillPolygon(p);
    placeNumbers(g, p, isValidHex, hexValueIterator.next());
    // repaint();
    return g;
}

现在，绘画逻辑只读取hexValueList，而不修改它，因此，多久调用一次paint方法都没有关系。

我也删除了flag = false;，因为它没有目的。 flag是方法参数，因此在方法内部更改其值对方法外部无效。