2018_05_11 Mobile Class_How to draw Line and Circle

package my.d11_ryankim;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    final static int LINE=1, CIRCLE=2;
    static int curShape=LINE;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.activity_main);
        setContentView(new MyGraphic(this));

    }

    // Make CustermView
    public static class MyGraphic extends View{
        int startX=1;
        int startY=1;
        int stopX=-1;
        int stopY=-1;
        public MyGraphic(Context context){
            super(context);
        }
        public MyGraphic(Context context, AttributeSet attrs){
            super(context, attrs);
        }

        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);
            Paint paint =new Paint();
            paint.setColor(Color.BLUE);
            paint.setStrokeWidth(5.0f);
            paint.setStyle(Paint.Style.STROKE);

            switch (curShape){
                case LINE:
                    canvas.drawLine(startX,startY,stopX,stopY,paint);
                    break;
                case CIRCLE:
                    int radius = (int)Math.sqrt(Math.pow(stopX-startX,2)+Math.pow(stopY-startY,2));
                    canvas.drawCircle(startX,startY,radius,paint);
                    break;
            }
        }

        @Override
        public boolean onTouchEvent(MotionEvent event) {
            int action =event.getAction();
            switch (action){
                case MotionEvent.ACTION_DOWN:
                    startX = (int)event.getX();
                    startY = (int)event.getY();
//                    invalidate();
                case MotionEvent.ACTION_UP:
                    stopX = (int)event.getX();
                    stopY = (int)event.getY();
                    invalidate();
                case MotionEvent.ACTION_MOVE:
                    Toast.makeText(getContext(),"x:"+startX+",y:"+startY,Toast.LENGTH_SHORT).show();



            }
            return true;
            //return super.onTouchEvent(event);
        }
    }



    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        menu.add(0,1,2,"선그리기");
        menu.add(0,2,0,"원그리기");
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()){
            case 1:
                curShape=LINE;
                return true;
            case 2:
                curShape=CIRCLE;
                return true;


        }
        return super.onOptionsItemSelected(item);
    }// end of override

}   // End of MainActivity