안드로이드 프로그래밍 제 9장 연습문제 (5, 6번)

5번 ) 확대, 축소, 회전, 밝게, 어둡게, 그레이 효과를 내도록 하는 프로그램 구현하기

 

 

 

Java Code

 

public class MainActivity extends AppCompatActivity {
    Button btn1, btn2, btn3, btn4, btn5, btn6;
    static float scaleX=1, scaleY=1, angle=0, color=1, sat=1;
    MyGraphicView graphicView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        graphicView = new MyGraphicView(this);
        setContentView(graphicView);
        setTitle("연습하기");
    }

    public boolean onCreateOptionsMenu(Menu menu){
        super.onCreateOptionsMenu(menu);
        menu.add(0,1,0,"확대");
        menu.add(0,2,0,"축소");
        menu.add(0,3,0,"회전");
        menu.add(0,4,0,"밝게");
        menu.add(0,5,0,"어둡게");
        menu.add(0,6,0,"그레이영상");
        return true;
    }

    public boolean onOptionsItemSelected(MenuItem item){
        switch(item.getItemId()){
            case 1:
                scaleX += 0.2f;
                scaleY += 0.2f;
                graphicView.invalidate();
                return true;
            case 2:
                scaleX -= 0.2f;
                scaleY -= 0.2f;
                graphicView.invalidate();
                return true;
            case 3:
                angle += 40;
                graphicView.invalidate();
                return true;
            case 4:
                color += 0.2f;
                graphicView.invalidate();
                return true;
            case 5:
                color -= 0.2f;
                graphicView.invalidate();
                return true;
            case 6:
                sat = (sat + 1) % 2;
                graphicView.invalidate();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private static class MyGraphicView extends View{
        public MyGraphicView(Context context){
            super(context);
        }

        protected void onDraw(Canvas canvas){
            super.onDraw(canvas);
            Bitmap picture = BitmapFactory.decodeResource(getResources(), R.drawable.lion);
            Paint paint = new Paint();

            int cenX = this.getWidth() / 2;
            int cenY = this.getHeight() / 2;
            canvas.scale(scaleX, scaleY, cenX, cenY);
            canvas.rotate(angle,cenX,cenY);

            float[] array = {color, 0, 0, 0, 0,
                             0, color, 0, 0, 0,
                             0, 0, color, 0, 0,
                             0, 0, 0, 1, 0};
            ColorMatrix cm = new ColorMatrix(array);
            if(sat == 0) cm.setSaturation(sat);
            paint.setColorFilter(new ColorMatrixColorFilter(cm));

            int picX = (this.getWidth() - picture.getWidth()) / 2;
            int picY = (this.getHeight() - picture.getHeight()) / 2;

            canvas.drawBitmap(picture, picX, picY, paint);

            picture.recycle();
        }
    }
}

 

6번 ) 그린 도형이 계속 화면에 남아있도록 구현하기

 

 

 

Java Code

 

public class MainActivity extends AppCompatActivity {
    final static int LINE = 1, CIRCLE = 2, RECTANGLE = 3;
    final static int REDCOLOR = Color.RED, GREENCOLOR = Color.GREEN, BLUECOLOR = Color.BLUE;
    static int curShape = LINE, curColor = REDCOLOR;
    static int startX = -1, startY = -1, stopX = -1, stopY = -1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new MyGraphicView(this));
        setTitle("연습하기");
    }

    public boolean onCreateOptionsMenu(Menu menu){
        super.onCreateOptionsMenu(menu);
        menu.add(0,1,0,"선 그리기");
        menu.add(0,2,0,"원 그리기");
        menu.add(0,3,0,"사각형 그리기");

        SubMenu sMenu = menu.addSubMenu("색상 변경 >>");
        sMenu.add(0,4,0,"빨강색");
        sMenu.add(0,5,0,"초록색");
        sMenu.add(0,6,0,"파랑색");

        return true;
    }

    public boolean onOptionsItemSelected(MenuItem item){
        switch(item.getItemId()){
            case 1:
                curShape = LINE;
                startX = -1; startY = -1; stopX = -1; stopY = -1;
                return true;
            case 2:
                curShape = CIRCLE;
                startX = -1; startY = -1; stopX = -1; stopY = -1;
                return true;
            case 3:
                curShape = RECTANGLE;
                startX = -1; startY = -1; stopX = -1; stopY = -1;
                return true;
            case 4:
                curColor = REDCOLOR;
                startX = -1; startY = -1; stopX = -1; stopY = -1;
                return true;
            case 5:
                curColor = GREENCOLOR;
                startX = -1; startY = -1; stopX = -1; stopY = -1;
                return true;
            case 6:
                curColor = BLUECOLOR;
                startX = -1; startY = -1; stopX = -1; stopY = -1;
                return true;
        }
        return super.onOptionsItemSelected(item);
    }


    private static class MyGraphicView extends View{
        Vector<MyShape> v = new Vector<MyShape>();

        public MyGraphicView(Context context){
            super(context);
        }

        class MyShape{
            int shapeType;
            int startX, startY, endX, endY;
            int color;

            MyShape(int shapeType, int startX, int startY, int endX, int endY, int color){
                this.shapeType = shapeType; this.startX = startX; this.startY = startY;
                this.endX = endX; this.endY = endY; this.color = color;
            }
        }

        public boolean onTouchEvent(MotionEvent event){
            switch(event.getAction()){
                case MotionEvent.ACTION_DOWN:
                    startX = (int)event.getX();
                    startY = (int)event.getY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    stopX = (int)event.getX();
                    stopY = (int)event.getY();
                    this.invalidate();
                    break;
                case MotionEvent.ACTION_UP:
                    stopX = (int)event.getX();
                    stopY = (int)event.getY();
                    v.add(new MyShape(curShape, startX, startY, stopX, stopY, curColor));
                    this.invalidate();
                    break;
            }
            return true;
        }

        protected void onDraw(Canvas canvas){
            super.onDraw(canvas);
            Paint paint = new Paint();
            paint.setAntiAlias(true);
            paint.setStrokeWidth(5);
            paint.setStyle(Paint.Style.STROKE);
            paint.setColor(curColor);

            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;
                case RECTANGLE:
                    Rect rect = new Rect(startX,startY,stopX,stopY);
                    canvas.drawRect(rect, paint);
                    break;
            }

            for(int i=0; i<v.size(); i++){
                paint.setColor(v.get(i).color);
                switch(v.get(i).shapeType){
                    case LINE:
                        canvas.drawLine(v.get(i).startX, v.get(i).startY, v.get(i).endX, v.get(i).endY, paint);
                        break;
                    case CIRCLE:
                        int radius = (int)(Math.sqrt(Math.pow(v.get(i).endX-v.get(i).startX, 2)+Math.pow(v.get(i).endY-v.get(i).startY, 2)));
                        canvas.drawCircle(v.get(i).startX, v.get(i).startY, radius, paint);
                        break;
                    case RECTANGLE:
                        Rect rect = new Rect(v.get(i).startX, v.get(i).startY, v.get(i).endX, v.get(i).endY);
                        canvas.drawRect(rect, paint);
                        break;
                }
            }
        }
    }
}