转换（通常）是复杂的
public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2D = (Graphics2D)g; Graphics g2 = g.create(); Graphics2D copy = (Graphics2D)g2; copy.rotate(-angleRad, xPos, yPos); copy.translate(0, -moveY); g2D.translate(-moveX, 0); copy.draw(player.shape); for (Rectangle2D.Double r: DronePilot.rocksFloorArray) { g2D.draw(r); } for (Rectangle2D.Double r: DronePilot.rocksCeilArray) { g2D.draw(r); } for (Rectangle2D.Double r: DronePilot.roomsArray) { g2D.draw(r); }}在以上代码中，您正在翻译原始
Graphics上下文和
copy。在这种情况下，原始上下文
copy不会受到的影响
copy，但原始上下文是共享资源，并且由于您不重置翻译，因此您将继续获取翻译后的上下文每次（复合）。
作为一般经验法则，对副本执行所有转换，并在完成后将其处理。
例如…
Graphics2D g2d = (Graphics2D)g.create();AffineTransform at = AffineTransform.getTranslateInstance(playerPoint.x, playerPoint.y);at.rotate(Math.toRadians(angle), player.getBounds2D().getCenterX(), player.getBounds2D().getCenterY());g2d.setTransform(at);g2d.setColor(Color.RED);g2d.fill(player);g2d.setColor(Color.BLACK);g2d.draw(player);g2d.dispose();
基本上，这会将对象的位置转换为玩家的位置，然后围绕对象的中心旋转对象
您还可以应用一个转换，创建该上下文的副本，然后应用另一个转换，该转换将变得复杂（因此，您可以将
translate一个上下文复制，然后
rotate将副本和第一个译文应用于副本）
这个令人难以置信的简单示例演示了两个基本示例…
- 使用
Graphics
上下文和AffineTransform
来平移和旋转播放器对象（围绕它的中心点） - 使用a
Path2D
生成变形的形状（此示例制作了两个对象，但是您可以使用单个AffineTransform
平移和旋转的对象并将其应用一次）。
在两种情况下，它们都不会影响原始形状
import java.awt.Color;import java.awt.Dimension;import java.awt.EventQueue;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Point;import java.awt.Rectangle;import java.awt.Shape;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.geom.AffineTransform;import java.awt.geom.Path2D;import java.awt.geom.Rectangle2D;import java.util.Random;import javax.swing.Jframe;import javax.swing.JPanel;import javax.swing.Timer;public class Test { public static void main(String[] args) { new Test(); } public Test() { EventQueue.invokeLater(new Runnable() { @Override public void run() { Jframe frame = new Jframe(); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); frame.add(new TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { private Shape player; private Point playerPoint; private float angle; private float deltaZ = 1.0f; private int deltaX, deltaY; public TestPane() { player = new Rectangle(0, 0, 20, 20); playerPoint = new Point(80, 80); Random rnd = new Random(); deltaX = 1; deltaY = -1; Timer timer = new Timer(5, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { playerPoint.x += deltaX; playerPoint.y += deltaY; Shape rotatedPlayer = rotatedAndTranslatedPlayer(); Rectangle2D bounds = rotatedPlayer.getBounds2D(); if (bounds.getX() < 0.0) { playerPoint.x = (int)(bounds.getX() * -1); deltaX *= -1; } else if (bounds.getX() + bounds.getWidth() >= getWidth()) { playerPoint.x = getWidth() - (int)bounds.getWidth(); deltaX *= -1; } if (bounds.getY() < 0) { playerPoint.y = 0; deltaY *= -1; } else if (bounds.getY() + bounds.getHeight() > getHeight()) { playerPoint.y = getHeight() - (int)bounds.getHeight(); deltaY *= -1; } angle += deltaZ; repaint(); } }); timer.start(); } @Override public Dimension getPreferredSize() { return new Dimension(200, 200); } protected Shape rotatedAndTranslatedPlayer() { Path2D.Double rotated = new Path2D.Double(player, AffineTransform.getRotateInstance( Math.toRadians(angle), player.getBounds2D().getCenterX(), player.getBounds2D().getCenterY())); return new Path2D.Double(rotated, AffineTransform.getTranslateInstance(playerPoint.x, playerPoint.y)); } // Simply paints the "area" that the player takes up when it's rotated and // translated protected void paintAutoTranslatedShape(Graphics2D g2d) { g2d.setColor(Color.DARK_GRAY); g2d.fill(rotatedAndTranslatedPlayer().getBounds2D()); } // Uses a AffineTransform to translate and rotate the player protected void paintPlayer(Graphics2D g2d) { AffineTransform at = AffineTransform.getTranslateInstance(playerPoint.x, playerPoint.y); at.rotate(Math.toRadians(angle), player.getBounds2D().getCenterX(), player.getBounds2D().getCenterY()); g2d.setTransform(at); g2d.setColor(Color.RED); g2d.fill(player); g2d.setColor(Color.BLACK); g2d.draw(player); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); paintAutoTranslatedShape(g2d); g2d.dispose(); g2d = (Graphics2D) g.create(); paintPlayer(g2d); g2d.dispose(); } }}
