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正如标题所说，就是不能这样做。试图很长时间，但仍然失败。 （我是新来的Java）
我的图片或fillRect转动一点点，但并不像它应该旋转
整个代码+ IMGS
无法实现对象旋转朝向鼠标JAVA
*MAIN game class*
package game.main;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
public class game extends Canvas implements Runnable{
private static final long serialVersionUID = -392333887196083915L;
public static final int WIDTH = 640, HEIGHT = WIDTH/12 * 9;
private Thread thread;
private boolean running = false;
private Handler handler;
public game(){
handler = new Handler();
new window(WIDTH, HEIGHT,"Game",this);
handler.addObject(new Player(WIDTH/2-32, HEIGHT/2-32, ID.Player, handler));
}
public synchronized void start(){
thread = new Thread(this);
thread.start();
running = true;
}
public synchronized void stop(){
try{
thread.join();
running = false;
}catch(Exception e){
e.printStackTrace();
}
}
// ↓ game loop for update
public void run(){
this.requestFocus();
long lastTime = System.nanoTime();
double amountOfTicks = 60.0;
double ns = 1000000000/amountOfTicks;
double delta = 0;
long timer = System.currentTimeMillis();
int frames = 0;
while(running){
long now = System.nanoTime();
delta += (now - lastTime)/ns;
lastTime = now;
while(delta >= 1){
tick();
delta--;
}
if(running)
render();
frames++;
if(System.currentTimeMillis() - timer > 1000){
timer += 1000;
System.out.print("FPS:" + frames);
frames = 0;
}
}
stop();
}
private void tick(){
handler.tick();
}
private void render(){
BufferStrategy bs = this.getBufferStrategy();
if(bs == null){
this.createBufferStrategy(3);
return;
}
Graphics g = bs.getDrawGraphics();
g.setColor(Color.black);
g.fillRect(0, 0, WIDTH, HEIGHT);
handler.render(g);
g.dispose();
bs.show();
}
public static void main(String args[]) {
new game();
}
}
<br>
package game.main;
import java.awt.Graphics;
public abstract class GameObject {
protected float x, y;
protected ID id;
protected float velX, velY;
public GameObject(float x, float y, ID id){
this.x = x;
this.y = y;
this.id = id;
}
public abstract void tick();
public abstract void render(Graphics g);
public void setX(int x){
this.x = x;
}
public void setY(int y){
this.y = y;
}
public float getX(){
return x;
}
public float getY(){
return y;
}
public void setId(ID id){
this.id = id;
}
public ID getId(){
return id;
}
public void setVelX(int velX){
this.velX = velX;
}
public void setVelY(int velY){
this.velY = velY;
}
public float getVelX(){
return velX;
}
public float getVelY(){
return velY;
}
}
*GameObject class*
package game.main;
import java.awt.Graphics;
public abstract class GameObject {
protected float x, y;
protected ID id;
protected float velX, velY;
public GameObject(float x, float y, ID id){
this.x = x;
this.y = y;
this.id = id;
}
public abstract void tick();
public abstract void render(Graphics g);
public void setX(int x){
this.x = x;
}
public void setY(int y){
this.y = y;
}
public float getX(){
return x;
}
public float getY(){
return y;
}
public void setId(ID id){
this.id = id;
}
public ID getId(){
return id;
}
public void setVelX(int velX){
this.velX = velX;
}
public void setVelY(int velY){
this.velY = velY;
}
public float getVelX(){
return velX;
}
public float getVelY(){
return velY;
}
}
*Handler class*
package game.main;
import java.awt.Graphics;
import java.util.LinkedList;
// render all objects
public class Handler {
LinkedList<GameObject> object = new LinkedList<GameObject>();
public void tick(){
for(int i = 0; i < object.size(); i++){
GameObject tempObject = object.get(i);
tempObject.tick();
}
}
public void render(Graphics g){
for(int i = 0; i <object.size();i++){
GameObject tempObject = object.get(i);
tempObject.render(g);
}
}// handling adding objects
public void addObject(GameObject object){
this.object.add(object);
}
}
*window class*
package game.main;
import java.awt.Canvas;
import java.awt.Dimension;
import javax.swing.JFrame;
public class window extends Canvas{
private static final long serialVersionUID = 3010486623466540351L;
public window(int width, int height, String title, game game){
JFrame frame = new JFrame(title);
frame.setPreferredSize(new Dimension(width, height));
frame.setMaximumSize(new Dimension(width, height));
frame.setMinimumSize(new Dimension(width, height));
// X button
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// ¤ button maximize
frame.setResizable(false);
// window appear in middle of screen instead of top left corner
frame.setLocationRelativeTo(null);
// add game to window
frame.add(game);
frame.setVisible(true);
game.start();
}
}
* ID class*
package game.main;
public enum ID {
Player();
}
添加的代码只对这种类
*Player class*
package game.main;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.PointerInfo;
public class Player extends GameObject{
Handler handler;
public Player(int x, int y, ID id, Handler handler) {
super(x, y, id);
this.handler = handler;
}
public void tick() {
}
public void render(Graphics g) {
///////////ADDED//////////////////
PointerInfo a = MouseInfo.getPointerInfo();
Point b = a.getLocation();
int mouseX = (int) b.getX();
int mouseY = (int) b.getY();
int centerX = game.WIDTH/2;
int centerY = game.HEIGHT/2;
double angle = Math.atan2(centerY - mouseY, centerX - mouseX) - Math.PI/2;
((Graphics2D)g).rotate(angle, centerX, centerY);
//////////////////////////////
g.setColor(Color.white);
g.fillRect((int)x, (int)y, 32, 32);
}
}
它现在如何工作，以及我想如何。白色 - 原始/ GREEN - 我喜欢这样吃
Example 1
Example 2
我在这个来源看：
Get mouse possition (stackoverflow)
Java 2d rotation in direction mouse point (stackoverflow)
Rotating an object to point towards the mouse
我不能说全部，但我可以说，对我来说，你可以做的一件最好的事情是帮助我理解你的问题，就是创建并发布一个体面的[mcve]（请参阅链接） 。 –
我狙击大部分代码并发布整个代码 – EJskater
未来，请不要这样做。请怜悯我们，记住我们都是志愿者。相反，创造一个真正的善良真正的[mcve]。 –