java - 使用 g.drawString 显示新行

Question

我必须制作一个显示其自己的源代码的小程序。这是我的:

 //Reference the required Java libraries
 import java.applet.Applet; 
 import java.awt.*; 

 //The applet code
 public class FirstApplet extends Applet {

     public void paint(Graphics g) {

       //Draw a rectangle width=250, height=100
       g.drawRect(0,0,250,600); 

       //Set the color to blue
       g.setColor(Color.blue); 

       //Write the message to the web page
       g.drawString("\n //Reference the required Java libraries\n import java.applet.Applet;\n import java.awt.*; \n //The applet code\n public class FirstApplet extends Applet {\n     public void paint(Graphics g) {\n       //Draw a rectangle width=250, height=100\n      g.drawRect(0,0,250,100); \n       //Set the color to blue\n       g.setColor(Color.blue); \n       //Write the message to the web page\n       g.drawString",10,50); 
    }
 } 

但是，\n 并没有换行。我的文字水平继续，直到完成。我将如何在 g.drawString 字段中创建新行？

Answer 1

也许你可以尝试这样的事情(未经测试):

public static void draw(final Graphics g, final int startX, final int startY, final String... lines){
    final FontMetrics metrics = g.getFontMetrics();
    final int spacing = metrics.getHeight() + metrics.getMaxDescent();
    draw(g, startX, startY, spacing, lines);
}

public static void draw(final Graphics g, final int startX, final int startY, final int vSpacing, final String... lines){
    int y = startY;
    for(final String line : lines){
        g.drawString(line, startX, y);
        y += vSpacing;
    }
}

第一种方法将计算高度(基于 Graphics 对象的当前 Font 的高度和下降)。第二种方法允许您输入自定义垂直间距值以获得更多可定制性。