プログラマ専用SNS ミクプラ

コード:

	private CustomListener vListener;
	private float pinchStartDistance = 0.0f;
	private PointF pinchStartPoint = new PointF();
	private float totalScale = 1.0f;
	private PointF totalMove = new PointF();
	private int touchMode = TOUCH_NONE;
	private static final int TOUCH_NONE  = 0;
	private static final int TOUCH_DRAG  = 1;
	private static final int TOUCH_ZOOM  = 2;
	private static final int TOUCH_FLICK = 3;
	public final boolean TURN_RIGHT = true;
	public final boolean TURN_LEFT = false;
	public final boolean TOUCHED_NOW = true;
	public final boolean TOUCHED_FINISH = false;

	private View.OnTouchListener tListener = new View.OnTouchListener(){
		@Override
		public boolean onTouch(View v, MotionEvent event) {
			//ピンチ操作でズーム処理をする
			switch(event.getAction() & MotionEvent.ACTION_MASK){
			//ピンチ操作開始
			case MotionEvent.ACTION_POINTER_DOWN:
				if(event.getPointerCount() >= 2){
					pinchStartDistance = getDistance(event);
					if(pinchStartDistance > 50f){
						pinchStartPoint = getCenterPoint(event);
						totalMove.x += pinchStartPoint.x * totalScale;
						totalMove.y += pinchStartPoint.y * totalScale;
						touchMode = TOUCH_ZOOM;
					}
				}
				break;
			//ピンチ操作中
			case MotionEvent.ACTION_MOVE:
				if(touchMode == TOUCH_ZOOM && pinchStartDistance > 0){
					float scale = 1.0f;
					scale = getDistance(event) / pinchStartDistance;
					scale *= totalScale;
					vListener.onPageZoom(totalMove.x,totalMove.y,scale,false);
				}
				break;
			//ピンチ操作終了
			case MotionEvent.ACTION_UP:
			case MotionEvent.ACTION_POINTER_UP:
				if(touchMode == TOUCH_ZOOM){
					totalScale = getDistance(event) / pinchStartDistance * totalScale;
					pinchStartPoint.x = 0.0f;
					pinchStartPoint.y = 0.0f;
					if(totalScale < 1.0f){
						totalScale = 1.0f;
						totalMove.x = totalMove.y = 0.0f;
						touchMode = TOUCH_NONE;
					}
					vListener.onPageZoom(totalMove.x, totalMove.y, totalScale, true);
				}
			}
			//ズーム中にドラッグ操作をするとビュアーをスライドする...のが目的
			switch(event.getAction() & MotionEvent.ACTION_MASK){
			//ドラッグ操作開始
			case MotionEvent.ACTION_DOWN:
				if(touchMode == TOUCH_ZOOM & event.getPointerCount() == 1){
					pinchStartPoint.x = event.getX();
					pinchStartPoint.y = event.getY();
					touchMode = TOUCH_DRAG;
				}
				break;
			//ドラッグ操作中
			case MotionEvent.ACTION_MOVE:
				if(touchMode == TOUCH_DRAG){
					float moveX = totalMove.x - (event.getX() - pinchStartPoint.x);
					float moveY = totalMove.y - (event.getY() - pinchStartPoint.y);
					vListener.onPageDrag(moveX, moveY, false);
				}
				break;
			//ドラッグ操作終了
			case MotionEvent.ACTION_UP:
				if(touchMode == TOUCH_DRAG){
					totalMove.x = totalMove.x - (event.getX() - pinchStartPoint.x);
					totalMove.y = totalMove.y - (event.getY() - pinchStartPoint.y);
					touchMode = TOUCH_ZOOM;
					if(totalMove.x < 0.0f){
						totalMove.x = 0.0f;
					}else if(totalMove.x > viewerWidth){
						totalMove.x = viewerWidth;
					}
					if(totalMove.y < 0.0f){
						totalMove.y = 0.0f;
					}else if(totalMove.y > viewerHeight){
						totalMove.y = viewerHeight;
					}
					vListener.onPageDrag(totalMove.x, totalMove.y, true);
				}
			}
			//フリック操作でビュアーのページを更新
			switch(event.getAction() & MotionEvent.ACTION_MASK){
			//フリック操作開始
			case MotionEvent.ACTION_DOWN:
				if(touchMode == TOUCH_NONE & event.getPointerCount() == 1){
					pinchStartPoint.x = event.getX();
					touchMode = TOUCH_FLICK;
				}
				break;
			//フリック操作終了
			case MotionEvent.ACTION_UP:
				if(touchMode == TOUCH_FLICK){
					if(event.getX() - pinchStartPoint.x < - viewerWidth / 2){
						vListener.onTurnPage(TURN_RIGHT);	//左向きにページめくり
					}else if(event.getX() - pinchStartPoint.x > viewerWidth / 2){
						vListener.onTurnPage(TURN_LEFT);	//右向きにページめくり
					}
					touchMode = TOUCH_NONE;
				}
				break;
			}
			return true;
		}
	};

	//ピンチ距離取得用
	private	float getDistance(MotionEvent event) {
		if(event.getPointerCount() > 1){
			float x = event.getX(0) - event.getX(1);
			float y = event.getY(0) - event.getY(1);
			return android.util.FloatMath.sqrt(x * x + y * y);
		}else{
			return pinchStartDistance;
		}
	}

	//ピンチ開始座標取得用
	private	PointF getCenterPoint(MotionEvent event) {
		PointF pt = pinchStartPoint;
		if(event.getPointerCount() > 1){
			pt.x = (event.getX(0) + event.getX(1)) * 0.5f;
			pt.y = (event.getY(0) + event.getY(1)) * 0.5f;
		}
		return pt;
	}