91 lines
2.0 KiB
Java
91 lines
2.0 KiB
Java
import java.awt.*;
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import java.awt.font.*;
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import java.awt.geom.*;
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import javax.swing.*;
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/**
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* @version 1.33 2007-04-14
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* @author Cay Horstmann
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*/
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public class FontTest
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{
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public static void main(String[] args)
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{
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EventQueue.invokeLater(new Runnable()
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{
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public void run()
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{
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FontFrame frame = new FontFrame();
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.setVisible(true);
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}
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});
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}
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}
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/**
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* A frame with a text message component
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*/
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class FontFrame extends JFrame
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{
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public FontFrame()
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{
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setTitle("FontTest");
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setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
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// add component to frame
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FontComponent component = new FontComponent();
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add(component);
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}
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public static final int DEFAULT_WIDTH = 300;
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public static final int DEFAULT_HEIGHT = 200;
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}
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/**
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* A component that shows a centered message in a box.
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*/
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class FontComponent extends JComponent
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{
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public void paintComponent(Graphics g)
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{
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Graphics2D g2 = (Graphics2D) g;
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String message = "Hello, World!";
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Font f = new Font("Serif", Font.BOLD, 36);
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g2.setFont(f);
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// measure the size of the message
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FontRenderContext context = g2.getFontRenderContext();
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Rectangle2D bounds = f.getStringBounds(message, context);
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// set (x,y) = top left corner of text
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double x = (getWidth() - bounds.getWidth()) / 2;
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double y = (getHeight() - bounds.getHeight()) / 2;
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// add ascent to y to reach the baseline
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double ascent = -bounds.getY();
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double baseY = y + ascent;
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// draw the message
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g2.drawString(message, (int) x, (int) baseY);
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g2.setPaint(Color.LIGHT_GRAY);
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// draw the baseline
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g2.draw(new Line2D.Double(x, baseY, x + bounds.getWidth(), baseY));
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// draw the enclosing rectangle
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Rectangle2D rect = new Rectangle2D.Double(x, y, bounds.getWidth(), bounds.getHeight());
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g2.draw(rect);
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}
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}
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