如何在PhotoVIew中缩放(缩放和移动)到位图的x，y坐标? [英] How to scale (zoom and move) to x,y coordinates of Bitmap in PhotoVIew?

问题描述

我使用lib https://github.com/chrisbanes/PhotoView

一开始我在位图上有位图和x，y点.

At start I have Bitmap and x,y point on the Bitmap.

如何将图像缩放和缩放到位图的x，y坐标?

int bitmapWidth = bitmap.getWidth();//2418
int bitmapHeight = bitmap.getHeight();//1889
float x = 1209f;
float y = 944f;

float targetScale = 4f;    
attacher.setScale(targetScale, x,y, false);//it doesnt work

比例= 1f

scale = 4f，我想以编程方式将中心移至x，y坐标

scale = 4f and I want programly move center to x,y coordinates

推荐答案

我遇到了同样的问题，并最终解决了这个问题.

I was facing the same issue, and finally made it.

为此，我尝试了很多事情.首先，您需要将坐标转换为PhotoView:

So to achieve that I tried many things. First of all you need to convert your coordinates to the PhotoView :

int bitmapWidth = bitmap.getWidth();//2418
int bitmapHeight = bitmap.getHeight();//1889
float x = 1209f;
float y = 944f;

float focalX = x*photoView.getRight()/bitmap.getWidth();
float focalY = y*photoView.getBottom()/bitmap.getHeight();

float targetScale = 4f;
attacher.setScale(targetScale, focalX, focalY, false);

来源:GitHub aslansari

Source : GitHub aslansari

此答案适用于缩放部分.对于放大时您的对象中心在屏幕中心以编程方式移动的部分，我进行了此操作.

This answer works for the zoom part. For the part of the programmatically movement of your object center to be on the screen center when zoomed in I made this.

var event = MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, focalX, focalY, 0)
mPhotoView.dispatchTouchEvent(event)

val centerImageX = showResultCoinDetectionPhotoView.displayRect.centerX()
val centerImageY = showResultCoinDetectionPhotoView.displayRect.centerY()

var event = event = MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_MOVE, centerImageX, centerImageY, 0)
mPhotoView.dispatchTouchEvent(event)

如果您不需要缩放比例的动画，则不需要更多.

如果要使用动画

我知道了这个问题，但是还不能解决.这是我的想法.

If you doesn't need the animation on the scale you doesn't need more.

If you want to use the animation

I figured the issue, but can't fix it yet. Here is my thoughts.

那是行不通的，因为它在另一个线程中调用了动画.

That doesn't work because it call the animation in another thread.

//PhotoViewAttacher.java
mImageView.post(new AnimatedZoomRunnable(getScale(), scale, focalX, focalY));

同时，我尝试模拟运动以将点重新居中到屏幕中心.

And in the same time I tried to simulate the movement to re-center the point int the center of the screen.

var event = MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, focalX, focalY, 0)
mPhotoView.dispatchTouchEvent(event)

val centerImageX = showResultCoinDetectionPhotoView.displayRect.centerX()
val centerImageY = showResultCoinDetectionPhotoView.displayRect.centerY()

var event = event = MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_MOVE, centerImageX, centerImageY, 0)
mPhotoView.dispatchTouchEvent(event)

但是当代码的这一部分执行完毕时，缩放比例还没有完成，因此无法移动，因为图像尺寸已满，我们无法拖动完整尺寸的图像.

But when this part of the code get executed the scale isn't finished, so the movement can't happened cause the image is full sized and we can't drag a full size image.

为了解决这个问题，我删除了动画.

So to resolve that I remove the animation.

mPhotoView.setScale(5f, focalX, focalY, false)

另一种解决方案是使用回调或协程进行缩放，并同时进行移动，因为我们将进入顺序代码部分.但是AnimatedZoomRunnable在另一个线程中，所以我们将继续进行操作:

An other solution could be use a callback or coroutine for the scaling and in the same time do the move, cause we will be in a sequential code part. But the AnimatedZoomRunnable is in another thread so we will go till the :

if (animate) {
       mImageView.post(new AnimatedZoomRunnable(getScale(), scale, focalX, focalY));
}

然后返回协程的下一行.

And go back to the next line of the coroutine.

所以实际上我没有更多选择.也许像在GoogleMap中那样放置一个按钮，使其能够在屏幕中间居中，并在用户单击时执行模拟拖动"?

So actually I don't have more option to do that. Maybe place a button to be able to center the point in the middle of the screen like in GoogleMap and execute the "simulating drag" when user click ?

还是没有一种方法可以在AnimatedZoomRunnable完成时获得通知?

Or does there is a way to get notify when AnimatedZoomRunnable is finished ?

如果您发现有趣的东西，请告诉我.

Let me know if you found something interesting.

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