java - 如何在 OpenCV for Android 的 Touch 框架上绘制多个矩形？

Question

首先，我在 Eclipse 上执行此操作。

1.我希望在接收到 Touch 事件时绘制一个矩形。2.那个矩形应该是持久的，并且在另一个 Touchevent 上应该绘制另一个矩形。3.我已经设法让它在单个 TouchEvent 中保持不变，之后它会根据坐标移动。4.所以基本上，由于不同的触摸事件，我应该有多个矩形。

我正在考虑遍历数组...但我仍然很困惑请帮忙!这个不行……我要求改进……谢谢!还 list 和东西是正确的，权限是正确的!代码有点像:

package code.e14.balldetector;

import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewFrame;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Scalar;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.WindowManager;

public class MainActivity extends Activity implements CvCameraViewListener2, OnTouchListener {
    private static final String TAG = "OCVBallTracker";

private CameraBridgeViewBase mOpenCvCameraView;
private boolean              mIsJavaCamera = true;
private Mat                    mRgba;
int i=0;
private Double[] h=new Double[20];
private Double[] k=new Double[20]; 
private double x=0;
private double y=0;

private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS:
            {
                Log.i(TAG, "OpenCV loaded successfully");
                mOpenCvCameraView.enableView();
                mOpenCvCameraView.setOnTouchListener(MainActivity.this);
            } break;
            default:
            {
                super.onManagerConnected(status);
            } break;
        }
    }
};

public MainActivity() {
    Log.i(TAG, "Instantiated new " + this.getClass());
}


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    Log.i(TAG, "called onCreate");
    super.onCreate(savedInstanceState);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

    setContentView(R.layout.activity_main);
    if (mIsJavaCamera)
        mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.java_surface_view);
    else
        mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.native_surface_view);

    mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);

    mOpenCvCameraView.setCvCameraViewListener(this);


}

@Override
public void onPause()
{
    super.onPause();
    if (mOpenCvCameraView != null)
        mOpenCvCameraView.disableView();
}

@Override
public void onResume()
{
    super.onResume();
    OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_5, this, mLoaderCallback);
}

public void onDestroy() {
    super.onDestroy();
    if (mOpenCvCameraView != null)
        mOpenCvCameraView.disableView();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    Log.i(TAG, "called onCreateOptionsMenu");


    return true;
}



public void onCameraViewStarted(int width, int height) {
    mRgba = new Mat(height, width, CvType.CV_8UC4);

}

public void onCameraViewStopped() {
     mRgba.release();
}
@Override
public boolean onTouch(View arg0,MotionEvent event) {

    double cols = mRgba.cols();
    double rows = mRgba.rows();

    double xOffset = (mOpenCvCameraView.getWidth() - cols) / 2;
    double yOffset = (mOpenCvCameraView.getHeight() - rows) / 2;




     h[i] = (double)(event).getX() - xOffset;
     k[i] = (double)(event).getY() - yOffset;

   h[i]=x;
   k[i]=y;

    Log.i(TAG, "Touch image coordinates: (" + h[i] + ", " + k[i] + ")");


   i++;





    return false;// don't need subsequent touch events
}
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
    mRgba=inputFrame.rgba();





     Core.rectangle(mRgba, new Point(x-100,y-100),new Point(x+100,y+100),new Scalar( 0, 0, 255 ),0,8, 0 );



    return mRgba;
}

Answer 1

将矩形存储在列表中非常容易。我做了一些应该有效的小调整。

private List<Rect> ListOfRect = new ArrayList<Rect>();

@Override
public boolean onTouch(View arg0,MotionEvent event) {

  double cols = mRgba.cols();
  double rows = mRgba.rows();

  double xOffset = (mOpenCvCameraView.getWidth() - cols) / 2;
  double yOffset = (mOpenCvCameraView.getHeight() - rows) / 2;

  h[i] = (double)(event).getX() - xOffset;
  k[i] = (double)(event).getY() - yOffset;

 h[i]=x;
 k[i]=y;

 ListOfRect.add(new Rect(x-100, y-100, x+100, y+100));

 Log.i(TAG, "Touch image coordinates: (" + h[i] + ", " + k[i] + ")");

 i++;

 return false;// don't need subsequent touch events
}

public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
   mRgba=inputFrame.rgba();

   for(int i=0; i<ListOfRect.size(); i++){
       Core.rectangle(mRgba, ListOfRect.get(i).tl(), ListOfRect.get(i).br(),new Scalar( 0, 0, 255 ),0,8, 0 );}

   return mRgba;
}

但是请记住，当您不再需要矩形时，您需要释放并清除您的列表以释放内存。希望对您有所帮助。