미니포토샵

package com.naver.miniphotoshop;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageButton;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {

    MyView myView;
    ImageButton ibZoomIn, ibZoomOut, ibRotate,ibBright, ibDark, ibGray,ibPen;

    static float scaleX = 1, scaleY = 1;
    static boolean isPen=false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("미니 포토샵");

        LinearLayout pictureLayout = (LinearLayout) findViewById(R.id.pictureLayout);
        myView = new MyView(this);
        pictureLayout.addView(myView);

         //확대버튼
        ibZoomIn=(ImageButton)findViewById(R.id.imageButton);

        ibZoomIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                scaleX = scaleX + 0.2f;
                scaleY = scaleY + 0.2f;
                myView.invalidate();
            }
        });

        //축소버튼
        ibZoomOut=(ImageButton)findViewById(R.id.imageButton2);
        ibZoomOut.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(scaleX>0.5f && scaleY>0.5f){
                    scaleX = scaleX - 0.2f;
                    scaleY = scaleY - 0.2f;
                }
                myView.invalidate();
            }
        });

        //펜기능
        ibPen=(ImageButton)findViewById(R.id.imageButton7);
        ibPen.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                if(isPen){
                    isPen=false;
                }else{
                    isPen=true;
                }
            }
        });


    }

    // inner class. custom view
    private static class MyView extends View {
        int x;
        int y;

        Path path = new Path();
        public MyView(Context context) {
            super(context);
        }

        @Override
        public boolean onTouchEvent(MotionEvent event) {
            if(isPen){
                switch (event.getAction()){
                    case MotionEvent.ACTION_DOWN:
                        x=(int)event.getX();
                        y=(int)event.getY();
                        path.moveTo(x, y);
                        this.invalidate();
                        break;
                    case MotionEvent.ACTION_MOVE:
                        x=(int)event.getX();
                        y=(int)event.getY();
                        path.lineTo(x, y);
                        this.invalidate();
                        break;
                    case MotionEvent.ACTION_UP:
                        break;
                }
            }

            return true;
        }

        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);


            Bitmap picture = BitmapFactory.decodeResource(getResources(),
                    R.drawable.android01);
            int picX = (this.getWidth() - picture.getWidth()) / 2;
            int picY = (this.getHeight() - picture.getHeight()) / 2;
            int cenX = this.getWidth() / 2;
            int cenY = this.getHeight() / 2;
            canvas.scale(scaleX, scaleY, cenX, cenY);
            canvas.drawBitmap(picture,picX,picY,null);
            picture.recycle();

            Paint paint=new Paint();
            paint.setStrokeWidth(3);
            paint.setColor(Color.BLACK);
            paint.setStyle(Paint.Style.STROKE);

            canvas.drawPath(path, paint);
        }



    }


}