Question

我已经实现了用于缩放图像的触摸缩放方法，并且它的工作完美但我想要缩放图像的触摸区域的那部分将是缩放的并且该触摸区域仅需要改变位置或缩放< / p>

例如：我有一个透明的两个球的图像，如果我将触摸一个球并将其拖动到最接近另一个球，那么只有那个球将被缩放。

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);
}

有可能得到那个吗？

Answer 1

我认为从你的查询中你想要在缩放后实现拖动图像（双击），可能是你的缩放工作完美但你想在缩放后添加一些懒惰的拖动动画，所以我给你全面测试放大/缩小/ drage imageview类刚刚用你的oldone替换它我跳它适合你对不起，我已经尝试了很多次，但是对于charector限制不能过去的代码听到所以我给你的网址请去找课感谢
TOuchview class link click on it

在触摸区域缩放/缩放图像视图

1 个答案: