将像素坐标应用于屏幕坐标

Question

我试图让一个物体出现在最后一个人触摸的地方.但是,当我尝试这样做时,它出现在错误的地方.我假设这是因为输入返回的坐标与显示坐标不同,我的代码如下:

public class Core implements ApplicationListener, InputProcessor
          { //Has to be here otherwise the code formatting becomes buggy


private Mesh squareMesh;
private PerspectiveCamera camera;
private Texture texture;
private SpriteBatch spriteBatch;
Sprite sprite;
float moveX = 0;


private final Matrix4 viewMatrix = new Matrix4();
private final Matrix4 transformMatrix = new Matrix4();

@Override
public void create()
{
    Gdx.input.setInputProcessor(this);


    texture = new Texture(Gdx.files.internal("door.png"));

    spriteBatch = new SpriteBatch();
    sprite = new Sprite(texture);
    sprite.setPosition(0, 0);
    viewMatrix.setToOrtho2D(0, 0, 480, 320);

    float x = 0;
    float y = 0;

}

@Override
public void dispose()
{
}

@Override
public void pause()
{
}

@Override
public void render()
{
    viewMatrix.setToOrtho2D(0, 0, 480, 320);
    spriteBatch.setProjectionMatrix(viewMatrix);
    spriteBatch.setTransformMatrix(transformMatrix);
    spriteBatch.begin();
    spriteBatch.disableBlending();
    spriteBatch.setColor(Color.WHITE);

    Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);


    //spriteBatch.draw(texture, 0, 0, 1, 1, 0, 0, texture.getWidth(),
    //      texture.getHeight(), false, false);
    sprite.draw(spriteBatch);
    spriteBatch.end();
    update();
}

@Override
public void resize(int width, int height)
{
    float aspectRatio = (float) width / (float) height;
    camera = new PerspectiveCamera(67, 2f * aspectRatio, 2f);

}

@Override
public void resume()
{
}

public void update()
{

    float delta = Gdx.graphics.getDeltaTime();

    if(Gdx.input.isTouched())
    {
         Vector3 worldCoordinates = new Vector3(sprite.getX(), sprite.getY(), 0);
         camera.unproject(worldCoordinates);
        sprite.setPosition(Gdx.input.getX(), Gdx.input.getY());

        float moveX = 0;
        float moveY = 0;

 }
     }

为了简单起见,我裁剪了这段代码.我还制作了一个视频,展示了这个错误:http: //www.youtube.com/watch？v = m89LpwMkneI

Answer 1

Camera.unproject将屏幕坐标转换为世界坐标.

Vector3 pos = new Vector3(Gdx.input.getX(), Gdx.input.getY(), 0);
camera.unproject(pos);
sprite.setPosition(pos.x, pos.y);