[android] Canvas를 이용해 이미지 확대/축소 하기

캔버스를 이용해 이미지 확대/축소하는 코드

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Rect;
import android.os.Bundle;
import android.view.View;
import android.view.Window;

public class CanvasView extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(new ImageView(this));
    }
    
    public class ImageView extends View{
        
        private Bitmap image; // 이미지
        
        public ImageView(Context context) {
            super(context);
            setBackgroundColor(Color.WHITE);
            // 그림 읽어들이기 
            Resources r = context.getResources();
            image = BitmapFactory.decodeResource(r, R.drawable.excavator);
        }

        @Override
        protected void onDraw(Canvas canvas) {
            // 원본이미지
            canvas.drawBitmap(image, 0, 0, null);
            
            // 원본이미지 영역을 축소해서 그리기 
            int w = image.getWidth();
            int h = image.getHeight();
            Rect src = new Rect(0, 0, w, h);
            Rect dst = new Rect(0, 200, w / 2, 200 + h / 2);
            canvas.drawBitmap(image, src, dst, null);
            super.onDraw(canvas);
        }
    }
}