Java 如何将字符串插入矩形中?
这是我的代码:Java 如何将字符串插入矩形中?,java,string,rectangles,Java,String,Rectangles,这是我的代码: package com.Bench3.simplyMining; import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Keying extends JPanel { private static final long serialVersionUID = 1L; public Rectangle miningRock; public Recta
package com.Bench3.simplyMining;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Keying extends JPanel {
private static final long serialVersionUID = 1L;
public Rectangle miningRock;
public Rectangle Rocks;
public int mRockW = 150;
public int mRockH = 100;
public long rocks = 0;
public String rockAmount = rocks + " Rocks";
public Keying(Display f, Images i){
miningRock = new Rectangle(0, 658, mRockW, mRockH);
Rocks = new Rectangle(1024, 0, 0, 0);
f.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e){
}
public void keyReleased(KeyEvent e){
/* if(e.getKeyCode() == KeyEvent.VK_A){
left = false;
} -- Used for setting key combinations and stuff */
}
});
}
public void paintComponent(Graphics g){
if(Main.f.i.imagesLoaded){
super.paintComponent(g);
g.drawImage(Main.f.i.miningRock, miningRock.x, miningRock.y, miningRock.width, miningRock.height, null);
g.drawString(rockAmount, Rocks.x, Rocks.y);
this.setBackground(Color.WHITE); // Sets background color
// g.setColor(Color.WHITE); -- Used for setting colors
repaint();
}
}
}
我一直在尝试使用g.drawString()将字符串“rockAmount”插入矩形“Rocks”,但当我尝试时,它不会输出矩形内的字符串。我做错了什么
编辑:已解决,感谢Paul提供的答案。您需要在x和y位置添加矩形宽度和高度的1/2
g.drawString(rockAmount,Rocks.x+rectangleWidth/2,Rocks.y+rectangleHeight/2);
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestTextRect {
public static void main(String[] args) {
new TestTextRect();
}
public TestTextRect() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 200);
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
int mRockW = 150;
int mRockH = 100;
int x = ((getWidth() / 2) - mRockW) / 2;
int y = (getHeight() - mRockH) / 2;
badRect(g2d, x, y, mRockW, mRockH);
x = (getWidth() / 2) + (((getWidth() / 2) - mRockW) / 2);
goodRect(g2d, x, y, mRockW, mRockH);
g2d.dispose();
}
protected void badRect(Graphics2D g2d, int x, int y, int mRockW, int mRockH) {
g2d.drawRect(x, y, mRockW, mRockH);
String text = "rockAmount";
g2d.drawString(text, x, y);
}
protected void goodRect(Graphics2D g2d, int x, int y, int mRockW, int mRockH) {
g2d.drawRect(x, y, mRockW, mRockH);
FontMetrics fm = g2d.getFontMetrics();
String text = "rockAmount";
x = x + ((mRockW - fm.stringWidth(text)) / 2);
y = (y + ((mRockH - fm.getHeight()) / 2)) + fm.getAscent();
g2d.drawString(text, x, y);
}
}
}
文本的y位置表示基线减去字体上升。这意味着文本似乎呈现在y位置上方 呈现文本时,需要考虑文本和字体的
FontMetrics
例如,下面将在左侧矩形的x/y位置渲染文本,然后计算x/y位置,以便将文本置于给定矩形的中心
g.drawString(rockAmount,Rocks.x+rectangleWidth/2,Rocks.y+rectangleHeight/2);
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestTextRect {
public static void main(String[] args) {
new TestTextRect();
}
public TestTextRect() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 200);
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
int mRockW = 150;
int mRockH = 100;
int x = ((getWidth() / 2) - mRockW) / 2;
int y = (getHeight() - mRockH) / 2;
badRect(g2d, x, y, mRockW, mRockH);
x = (getWidth() / 2) + (((getWidth() / 2) - mRockW) / 2);
goodRect(g2d, x, y, mRockW, mRockH);
g2d.dispose();
}
protected void badRect(Graphics2D g2d, int x, int y, int mRockW, int mRockH) {
g2d.drawRect(x, y, mRockW, mRockH);
String text = "rockAmount";
g2d.drawString(text, x, y);
}
protected void goodRect(Graphics2D g2d, int x, int y, int mRockW, int mRockH) {
g2d.drawRect(x, y, mRockW, mRockH);
FontMetrics fm = g2d.getFontMetrics();
String text = "rockAmount";
x = x + ((mRockW - fm.stringWidth(text)) / 2);
y = (y + ((mRockH - fm.getHeight()) / 2)) + fm.getAscent();
g2d.drawString(text, x, y);
}
}
}
请查看以了解更多详细信息
您应该避免调用repaint
或从paintXxx
方法中调用repaint
的任何方法。由于在Swing中计划绘制的方式,这将建立一个无限循环,最终将消耗您的CPU周期,并使您的应用程序无响应
您还应该始终调用super.paintComponent
,无论您还想做什么
我还建议您使用
KeyListener
,因为它通过读取paintComponent()方法中的Don't invoke repaint()来更好地控制焦点级别。这将导致一个无限循环。请查看的答案是否有用。因此,您最终获得了100k
!带着一种印象祝贺:(嗯,老前辈的运气)::P在这一点上,我不愿意放弃投票权。哈哈哈;)@谢谢,当你坐在99.9k;)上时,我会记住这一点