Question

我想用Rectangle填充Panel以覆盖图像。但是我的代码没有任何反应。你知道为什么？我不想使用setBackground。

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<input type="hidden" id="userScore" value="20">
<div data-score="5" class="item">A</div>
<div data-score="15" class="item">B</div>
<div data-score="45" class="item">E</div>
<div data-score="25" class="item">C</div>
<div data-score="35" class="item">D</div>
<hr>
<div id="result">NEXT IS UNKNOWN!</div>

Answer 1

如果您想以这种方式更改面板背景。您需要像这样覆盖paintComponent方法。

JPanel jYourPanel = new JPanel(){
       @Override
       public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        //lets paint background
        g2.setColor(Color.RED);
        g2.fillRect(0, 0, getWidth(), getHeight());

      }
    }

Java：使用fillRect更改JPanel的颜色

1 个答案: