在触摸区域缩放/缩放图像视图

Question

我已经实现了缩放图像的触摸缩放方法，它的工作很完美，但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，如果我将触摸一个球并将其拖动到离另一个球最近的位置，那么只有那个球会被缩放。

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);
}

有没有可能得到它？

Answer 1

我认为从您的查询中您想在缩放后实现拖动图像（双击），可能是您的缩放工作正常，但您想在缩放后添加一些延迟拖动动画，所以我给您全面测试放大/缩小/drage imageview 类只是用你的oldone替换它 我希望它对你有用 抱歉，我尝试了很多次，但由于字符限制无法通过代码听到，所以我给你 url 请去寻找课程 谢谢
TOuchview class link click on it