在同一JPanel框架上添加多个Polygon对象 [英] Add multiple Polygon objects on the same JPanel frame
问题描述
所以我有一个使用Polygon绘制星形的DrawStar类:
So I have a DrawStar class that draws a star using Polygon like that:
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
int[] cX = new int[] {x, x+5, x+20, x+8, x+16, x, x-16, x-8, x-20, x-5, x};
int[] cY = new int[] {y, y+14, y+14, y+22, y+39, y+29, y+39, y+22, y+14, y+14, y};
Polygon pol = new Polygon(cX, cY, 11);
g2.setColor(this.color);
g2.draw(pol);
g2.fillPolygon(pol);
}
然后在我的主课程中我创建一个JPanel框架来绘制星星:
Then in my main class I create a JPanel frame to draw the stars:
...
JFrame starsframe = new JFrame();
starsframe.setTitle("Random stars...");
starsframe.setSize(600, 400);
starsframe.setLocationRelativeTo(null);
starsframe.setVisible(true);
starsframe.setResizable(false);
starsframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DrawStar star1 = new DrawStar(300, 200, CreateColor(color));
starsframe.add(star1);
DrawStar star2 = new DrawStar(400, 300, CreateColor(color));
starsframe.add(star2);
...
但是,它只适用于一颗星。如果我添加第二个(如上所述),则不绘制任何内容(CreateColor是我为星形颜色实现的功能)。如何在框架上添加它们?
还有一件事,即使我将框架的背景颜色设置为黑色,它也会在绘制星星后变为灰色。
However, it only works with one star. If I add a second one (like above), none is drawn (CreateColor is a function I implement for the star color). How can I add them all along on the frame? And one more thing, even if I set the frame's background color to Black, it gets Gray after the star is drawn.
谢谢!
推荐答案
我重现你的问题。这是布局
问题。默认情况下, JFrame
具有 BorderLayout
,其中 CENTER
对齐。您应该更改布局和屏幕大小。
I reproduce your problem. It was Layout
problem. By default JFrame
has BorderLayout
with CENTER
alignment. You should change your layout and screen size.
JFrame starsframe = new JFrame();
starsframe.setTitle("Random stars...");
starsframe.setLayout(new GridLayout( 1,2));// Use gridLayout
DrawStar star1 = new DrawStar(300, 200, Color.red);
starsframe.add(star1);
DrawStar star2 = new DrawStar(400, 300, Color.blue);
starsframe.add(star2);
starsframe.setSize(1000,700);// Increase the screen size.
starsframe.setLocationRelativeTo(null);
starsframe.setVisible(true);
starsframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
要查看我使用过的两颗星 GridLayout(1,2)
和更大 setSize(1000,700)
。但这不是最佳解决方案。你应该动态获得 x
, y
,使用 getWidth()<对应屏幕尺寸/ code>和
getHeight()
方法。
To see the two stars I used GridLayout(1,2)
and bigger setSize(1000, 700)
. But it is not optimum solution. You should get the x
, y
dynamically with corresponding to Screen Size using getWidth()
and getHeight()
method.
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