Question

我正在尝试为Android应用程序制作相机，通过拖动触摸屏来移动相机。我正在使用Cocos2D引擎进行开发。

问题是，无论何时你在屏幕上移动手指，屏幕上的所有内容都会消失而不是移动。

我的代码如下，我希望有人可以帮助我:)感谢您的时间。

@Override
public boolean ccTouchesMoved(MotionEvent event)
        {
            CGPoint location = CCDirector.sharedDirector().convertToGL(CGPoint.ccp(event.getX(), event.getY()));
            CGPoint movement = CGPoint.ccpSub(location, previousLocation);
            previousLocation = location;
            //Update the camera
            float[] x = new float[1];
            float[] y = new float[1];
            float[] z = new float[1];
            this.getCamera().getCenter(x, y, z);
            CameraPos.x = x[0];
            CameraPos.y = y[0];
            this.getCamera().getEye(x, y, z);
            movement.x = 2 * movement.x * (1 + (z[0]/832));
            movement.y = 2 * movement.y * (1 + (z[0]/832));
            CameraPos.x = CameraPos.x - Math.round(movement.x);
            CameraPos.y = CameraPos.y - Math.round(movement.y);
            this.getCamera().setCenter(CameraPos.x, CameraPos.y, 0);
            this.getCamera().setEye(CameraPos.x, CameraPos.y, z[0]);
            return true;
        }

Answer 1

很好，我还是把它弄好了。

对于任何想要了解这一点的人，我创建了一个名为CameraControls的类来控制相机的基本功能。它还没有完成（我可能会更改代码，因为我进行了诸如缩放功能之类的更改）但是这个允许我完美地跟踪触摸输入。

import org.cocos2d.nodes.CCDirector;
import org.cocos2d.types.CGPoint;
import org.cocos2d.types.CGSize;

public class CameraControls {

CGSize winSize = CCDirector.sharedDirector().displaySize();
CGPoint CameraPos = CGPoint.ccp(winSize.width, winSize.height);
CGPoint previousLocation;
double minX;
double maxX;
double minY;
double maxY;

public CameraControls(World world)
{
    this.loadCamera(world);
}

public void setCameraLimit(float minX, float maxX, float minY, float maxY)
{
    this.minX = minX;
    this.maxX = maxX;
    this.minY = minY;
    this.maxY = maxY;
}

public void loadCamera(World world)
{
    float[] x = new float[1];
    float[] y = new float[1];
    float[] z = new float[1];
    world.getCamera().getCenter(x, y, z);
    CameraPos.x = x[0];
    CameraPos.y = y[0]; 
}

public void trackTouchMovement(CGPoint location, World world)
{
    if(previousLocation == null)
    {
        previousLocation = location;
    }
    CGPoint movement = CGPoint.ccpSub(previousLocation, location);
    previousLocation = location;
    float[] x1 = new float[1];
    float[] y1 = new float[1];
    float[] z1 = new float[1];
    world.getCamera().getEye(x1, y1, z1);
    CameraPos.x = CameraPos.x + movement.x;
    CameraPos.y = CameraPos.y + movement.y;

    try
    {
        if(CameraPos.x >= maxX || CameraPos.x <= minX || CameraPos.y >=  maxY || CameraPos.y <= minY)
        {
            CameraPos = CGPoint.ccpSub(CameraPos, movement);
        }
    }
    catch (NullPointerException e)
    {
        System.out.println("Invalid values for camera Limits. No Limits applied.");
    }

    world.getCamera().setCenter(CameraPos.x, CameraPos.y, 0);
    world.getCamera().setEye(CameraPos.x, CameraPos.y, z1[0]);
}

public void storePositionAsPrevious(CGPoint pos)
{
    previousLocation = pos;
}

public void resetPrevious()
{
    previousLocation = null;
}
}

现在我有了一个类，我只是在我的类中创建一个CameraControls实例，然后进行必要的配置。

CameraControls camera = new CameraControls(this);

在这种情况下，我希望我的相机可以查看的总面积是相机宽度的3倍，相机高度的3倍，所以我将相机的极限设置为相机的负宽度，当相机从（0,0）开始时，相机的宽度，相机的负高度和相机的高度。

    camera.setCameraLimit(-winSize.width, winSize.width, -winSize.height, winSize.height);

最后，我只需在ccTouchesBegan，ccTouchesMoved和ccTouchesEnded中添加必要的方法调用

@Override
public boolean ccTouchesMoved(MotionEvent event)
        {
            CGPoint location = CCDirector.sharedDirector().convertToGL(CGPoint.ccp(event.getX(), event.getY()));
            camera.trackTouchMovement(location, this);
            return true;
        }
@Override
public boolean ccTouchesEnded(MotionEvent event)
{
            camera.resetPrevious();
            return true;
}
@Override
public boolean ccTouchesBegan(MotionEvent event)
{
            CGPoint location = CCDirector.sharedDirector().convertToGL(CGPoint.ccp(event.getX(), event.getY()));
            camera.storePositionAsPrevious(location);
            return true;
}

使用触摸输入Cocos2D android移动相机

1 个答案: