如何在Java中爲遊戲旋轉圖像？

我想在遊戲中製作一個運動系統，玩家總是按照某個方向前進，通過按左右鍵可以改變他們。到目前爲止，我有這樣的代碼：如何在Java中爲遊戲旋轉圖像？

public class Player 
{ 
    private float x, y; 
    private int health; 
    private double direction = 0; 
    private BufferedImage playerTexture; 
    private Game game; 

    public Player(Game game, float x, float y, BufferedImage playerTexture) 
    { 
     this.x = x; 
     this.y = y; 
     this.playerTexture = playerTexture; 
     this.game = game; 
     health = 1; 
    } 

    public void tick() 
    { 
     if(game.getKeyManager().left) 
     { 
      direction++; 
     } 
     if(game.getKeyManager().right) 
     { 
      direction--; 
     } 
     x += Math.sin(Math.toRadians(direction)); 
     y += Math.cos(Math.toRadians(direction)); 
    } 

    public void render(Graphics g) 
    { 
     g.drawImage(playerTexture, (int)x, (int)y, null); 
    } 
}

此代碼工作正常的運動，但圖像不旋轉，以反映方向的變化，我想它。我怎樣才能使圖像旋轉，以便通常頂部始終指向「方向」（這是一個以度爲單位的角度）？

來源

2017-05-26 John

你可以保持它定義了播放器所指向的方向，從您可以簡單地accordingnly旋轉'Graphics'背景 – MadProgrammer

它的標誌取決於ru如何調用渲染函數。如果你可以放熱片段你打電話的功能將是有幫助的 –

渲染方法被稱爲每秒多次繪製播放器圖像，如果它正在移動。 – John

你需要一個仿射變換，旋轉圖像：

public class Player 
{ 
private float x, y; 
private int health; 
private double direction = 0; 
private BufferedImage playerTexture; 
private Game game; 

public Player(Game game, float x, float y, BufferedImage playerTexture) 
{ 
    this.x = x; 
    this.y = y; 
    this.playerTexture = playerTexture; 
    this.game = game; 
    health = 1; 
} 

public void tick() 
{ 
    if(game.getKeyManager().left) 
    { 
     direction++; 
    } 
    if(game.getKeyManager().right) 
    { 
     direction--; 
    } 
    x += Math.sin(Math.toRadians(direction)); 
    y += Math.cos(Math.toRadians(direction)); 
} 
AffineTransform at = new AffineTransform(); 
// The angle of the rotation in radians 
double rads = Math.toRadians(direction); 
at.rotate(rads, x, y); 
public void render(Graphics2D g2d) 
{ 
    g2d.setTransform(at); 
    g2d.drawImage(playerTexture, (int)x, (int)y, null); 
} 
}

來源

2017-05-26 04:45:44 AbelSurace

如何在Java中爲遊戲旋轉圖像？

回答

相關問題