[英]How to rotate an image in java for a game?
我正在尝试制作一种游戏系统,在该系统中,玩家始终朝着某个方向前进,通过按左右键可以改变方向。 到目前为止,我有以下代码:
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);
}
}
这段代码可以很好地移动,但是图像不会旋转以反映方向变化。 如何旋转图像,以便通常顶部始终指向“方向”(以度为单位的角度)?
您需要进行仿射变换来旋转图像:
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);
}
}
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