在被觸摸的區域縮放/縮放imageview

Question

我已經實現了縮放圖像的on-touch縮放方法，它的工作完美，但我想縮放圖像的被觸摸區域的那部分將被縮放並且被觸摸區域只需要改變位置或縮放

例如：我有一個透明的兩個球的圖像，如果我將觸摸一個球並將其拖動到最接近另一個球，那麼只有該球會縮放。

private void dumpEvent(MotionEvent event) 
{ 
String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE", 
     "POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" }; 
StringBuilder sb = new StringBuilder(); 
int action = event.getAction(); 
int actionCode = action & MotionEvent.ACTION_MASK; 
sb.append("event ACTION_").append(names[actionCode]); 
if (actionCode == MotionEvent.ACTION_POINTER_DOWN 
     || actionCode == MotionEvent.ACTION_POINTER_UP) 
{ 
    sb.append("(pid ").append(
      action >> MotionEvent.ACTION_POINTER_ID_SHIFT); 
    sb.append(")"); 
} 
sb.append("["); 
for (int i = 0; i < event.getPointerCount(); i++) 
{ 
    sb.append("#").append(i); 
    sb.append("(pid ").append(event.getPointerId(i)); 
    sb.append(")=").append((int) event.getX(i)); 
    sb.append(",").append((int) event.getY(i)); 
    if (i + 1 < event.getPointerCount()) 
     sb.append(";"); 
} 
sb.append("]"); 
Log.d(TAG, sb.toString()); 
} 

    @Override public boolean onTouch(View v, MotionEvent event) { 
ImageView view = (ImageView) v; 
dumpEvent(event); 

// Handle touch events here... 
switch (event.getAction() & MotionEvent.ACTION_MASK) { 
case MotionEvent.ACTION_DOWN: 
    savedMatrix.set(matrix); 
    start.set(event.getX(), event.getY()); 
    Log.d(TAG, "mode=DRAG"); 
    mode = DRAG; 
    break; 
case MotionEvent.ACTION_POINTER_DOWN: 
    oldDist = spacing(event); 
    Log.d(TAG, "oldDist=" + oldDist); 
    if (oldDist > 10f) { 
     savedMatrix.set(matrix); 
     midPoint(mid, event); 
     mode = ZOOM; 
     Log.d(TAG, "mode=ZOOM"); 
    } 
    break; 
case MotionEvent.ACTION_UP: 
case MotionEvent.ACTION_POINTER_UP: 
    mode = NONE; 
    Log.d(TAG, "mode=NONE"); 
    break; 
case MotionEvent.ACTION_MOVE: 
    if (mode == DRAG) { 
     // ... 
     matrix.set(savedMatrix); 
     matrix.postTranslate(event.getX() - start.x, event.getY() 
       - start.y); 
    } else if (mode == ZOOM) { 
     float newDist = spacing(event); 
     Log.d(TAG, "newDist=" + newDist); 
     if (newDist > 10f) { 
      matrix.set(savedMatrix); 
      float scale = newDist/oldDist; 
      matrix.postScale(scale, scale, mid.x, mid.y); 
     } 
    } 
    break; 
} 
view.setImageMatrix(matrix); 
return true; 
} 

/** Determine the space between the first two fingers */ 
private float spacing(MotionEvent event) { 
    float x = event.getX(0) - event.getX(1); 
    float y = event.getY(0) - event.getY(1); 
    return FloatMath.sqrt(x * x + y * y); 
} 

/** Calculate the mid point of the first two fingers */ 
private void midPoint(PointF point, MotionEvent event) { 
    float x = event.getX(0) + event.getX(1); 
    float y = event.getY(0) + event.getY(1); 
    point.set(x/2, y/2); 
} 

有沒有可能得到那個？

Answer 1

我想從你的查詢你想實現拖動圖像後，它縮放（雙擊），可能是你的縮放工作完美，但你想要添加一些懶惰後拖動動畫，所以我給你完整測試放大/ out/drage imageview類只是取代它與你的老人 我跳它爲你工作 對不起，我已經嘗試了很多次，但duue對charector限制不能過去的代碼聽到所以我給你的網址，請去找到類 謝謝
TOuchview class link click on it