使用循环绘制线条

Question

我应该用Java

绘制它

这是我到目前为止所做的：

DrawPanel.java

package drawpaneltest;

import java.awt.Graphics;
import javax.swing.JPanel;

public class DrawPanel extends JPanel {

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        int width = getWidth();
        int height = getHeight();
        int d = 0;
        while (d < 301) {
            g.drawLine(0, d, width, height);
            d += 15;
        }
    }
}

DrawPanelTest.java

package drawpaneltest;

import javax.swing.JFrame;

public class DrawPanelTest {

    public static void main(String[] args) {
        DrawPanel panel = new DrawPanel();
        JFrame application = new JFrame();
        application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        application.add(panel); // add the panel to the frame 
        application.setSize(250, 250); // set the size of the frame
        application.setVisible(true); // make the frame visible 
    }
}

上面的代码示例目前显示以下内容：

我错过了什么？我应该如何添加曲线和垂直线？

Answer 1

这是我的方法：

package drawpaneltest;


import java.awt.Graphics;
 import javax.swing.JPanel;
 public class DrawPanel extends JPanel {
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        int width = getWidth();
        int height = getHeight();
        int x1 = 0, y1 = 0,
            x2 = 0, y2 = height;
        while (y1 < height) {
            g.drawLine(x1, y1, x2, y2);
            y1+=15;                 //You should modify this if
            x2+=15;                 //it's not an equal square (like 250x250)
        }
    }
 }

然后它会这样做：

然而在JPanel中，坐标（0,0）从左上角开始， 像往常一样不在左下角。 它在（m×n）方格上仍然表现不佳，你必须做更多的事情。

Answer 2

您还应该更改to坐标（d替换width）：

g.drawLine(0, d, d, height);