在触摸区域Zoom/scale imageview

Question

我已经实现了缩放图像的触摸缩放方法并且它工作完美但是我想缩放图像的触摸区域的一部分将被缩放并且触摸区域只需要改变位置或缩放

例如：我有一个两个球的透明图像，如果我触摸一个球并将其拖动到离另一个球最近的位置，那么只会缩放那个球。

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);
}

有没有可能得到它？

Answer 1

根据你的查询，我认为你想在缩放后实现拖动图像（双击），可能是你的缩放效果很好，但你想在缩放后添加一些懒惰的拖动动画，所以我给你完整测试的缩放 in/out /drage imageview class 刚刚用你的旧版本替换了它我希望它对你有用抱歉，我已经尝试了很多次，但由于字符限制无法通过代码听到所以我给你 url 请去寻找 class 谢谢
TOuchview class link click on it

在触摸区域Zoom/scale imageview

On touched area Zoom/scale imageview

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