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[英]How to Rotate with AffineTransform and keep the orignal coordinates system?
[英]How to use AffineTransform and also a cordinate based system in Java?
我一直在用Java开发游戏,该游戏具有基于旋转的运动(这意味着您要旋转才能旋转,并且只能沿旋转方向前进和后退)。 我几乎可以正常工作了,但是最后遇到了一个问题。 为了使用AffineTransform,请使用g2d.drawImage([image],[AffineTransform的名称],null); 这不允许输入放置角色的坐标,这意味着我不能在屏幕上移动角色,而只能旋转它。
如何转换播放器图像(以旋转它),然后通过在屏幕上设置的xPos和yPos变量将其正确放置在屏幕上?
如果有帮助,这是我的代码。
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
public class Player
{
imageLoader loader = new imageLoader();
private BufferedImage player = loader.loadImage("/player.png");
private BufferedImage rotater = loader.loadImage("/player.png");
AffineTransform transform = new AffineTransform();
public int xPos = 200;
public int yPos = 200;
public double degrees = 90.0;
public Input input;
public void render(Graphics g) //SOMEWHERE IN THIS RENDER METHOD I HAVE TO ROTATE AND DRAW THE PLAYER TO THE SCREEN.
{
transform.setToIdentity();
transform.translate(player.getWidth() / 2, player.getHeight() / 2);
transform.rotate(Math.toRadians(degrees));
transform.translate(-player.getWidth()/2, -player.getHeight()/2);
Graphics2D g2d = (Graphics2D) g;
g2d.drawImage(player, transform, null);
System.out.println("PLAYER_X = "+xPos+" | " + "PLAYER_Y " + yPos + " | " + "ROTATION " + degrees);
}
public void moveForward()
{
xPos += (int) (Math.sin(degrees * (Math.PI/180)) * 4);
yPos += (int) (Math.cos(degrees * (Math.PI/180)) * -4);
}
public void moveBackward()
{
xPos -= (int) (Math.sin(degrees * (Math.PI/180)) * 4);
yPos -= (int) (Math.cos(degrees * (Math.PI/180)) * -4);
}
public void rotateLeft()
{
degrees = degrees - 4;
}
public void rotateRight()
{
degrees = degrees + 4;
}
}
非常感谢,我希望你们中的一个能帮助我。
瑞安·科克里(Ryan Corkery)
您已经有了在方法中旋转和平移(在特定位置绘制)的代码。 您的原始代码已经在坐标-width / 2,-height / 2处绘制了图像(因为图像绕其中心旋转,而不是绕其左上角旋转)
因此,只需添加需要在xPos,yPos上绘制的额外翻译即可:
transform.translate(-xPos + player.getWidth() / 2, -yPos + player.getHeight() / 2);
transform.rotate(Math.toRadians(degrees));
transform.translate(xPos - player.getWidth()/2, yPos - player.getHeight()/2);
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