我用Graphics.drawString绘制文本,但我想用矩形背景绘制字符串。
Use Graphics.fillRect
or Graphics2D.fill
before drawing the text.
Here's an example:
import java.awt.*;
import java.awt.geom.Rectangle2D;
import javax.swing.*;
public class FrameTestBase extends JFrame {
public static void main(String args[]) {
FrameTestBase t = new FrameTestBase();
t.add(new JComponent() {
public void paintComponent(Graphics g) {
String str = "hello world!";
Color textColor = Color.WHITE;
Color bgColor = Color.BLACK;
int x = 80;
int y = 50;
FontMetrics fm = g.getFontMetrics();
Rectangle2D rect = fm.getStringBounds(str, g);
g.setColor(bgColor);
g.fillRect(x,
y - fm.getAscent(),
(int) rect.getWidth(),
(int) rect.getHeight());
g.setColor(textColor);
g.drawString(str, x, y);
}
});
t.setDefaultCloseOperation(EXIT_ON_CLOSE);
t.setSize(400, 200);
t.setVisible(true);
}
}
Suggestion:
setOpaque(true);
setForeground(myForegroundColor);
setBackground(myBackgroundColor);
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