显示的给出各个参量所表示的具体范围代码,Java代码库,德仔网

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【Java】显示的给出各个参量所表示的具体范围

作者:Dezai.CN / 发布于2011/12/1/ 711

<div> public class MyTest extends JPanel {
 public void paintComponent(Graphics g) {
 super.paintComponent(g);
 Graphics2D g2 = (Graphics2D) g;
 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING
 , RenderingHints.VALUE_ANTIALIAS_ON);
 g2.setFont(new Font("SansSerif", 0, 200));
 FontMetrics fm = g2.getFontMetrics();
 int baseline = 300;
 g2.drawString("By", 200,baseline);
 g2.setColor(Color.red);
 g2.setFont(new Font("SansSerif", 0, 15));
 //可以看出Height = Ascent + Descent + Leading
 int ascent = fm.getAscent();
 int descent = fm.getDescent();
 int leading = fm.getLeading();
 int height = fm.getHeight();
 System.out.printf("Height = %d\tAscent = %d\tDescent = %d\tLeading = %d"
 ,height,ascent,descent,leading);
 //在文字上绘制每一个常量，用一条横线予以标注
 g2.drawLine(100, baseline, 500, baseline);
 g2.drawLine(100, baseline - ascent, 500, baseline - ascent);
 g2.drawLine(100, baseline + descent, 500, baseline + descent);
 g2.drawLine(100, baseline - ascent - leading, 500, baseline - ascent - leading);
 //指出基线的位置，和其他常量作用的范围。
 g2.drawString("Baseline",510,baseline);
 g2.drawLine(480, baseline - ascent, 480, baseline);
 //绘出Ascent的范围
 g2.drawString("Ascent", 510, baseline - ascent/2);
 g2.drawLine(480, baseline, 480, baseline + descent);
 //绘出Descent的范围
 g2.drawString("Descent", 510, baseline + descent/2);
 //绘出Leading的范围
 g2.drawLine(480, baseline - ascent, 480, baseline - ascent - leading);
 g2.drawString("Leading", 510, baseline - ascent - leading/2);
 //绘出Height的范围
 g2.drawLine(100,baseline - ascent - leading,100, baseline + descent);
 g2.drawString("Height", 30, baseline - ascent - leading + height/2);
 }
 public static void main(String[] args) {
 JFrame frame = new JFrame();
 frame.setTitle("Show Font's Metrics Info");
 frame.addWindowListener(new WindowAdapter() {
 public void windowClosing(WindowEvent e) {
 System.exit(0);
 }
 });
 frame.setContentPane(new MyTest());
 frame.setSize(800, 500);
 frame.setVisible(true);
 }
 }

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