将真实图像坐标转换为纵横比？

Question

例如：用户选择我发送到后端的 1000 * 1000 图像来检测对象，因此我得到图像中存在的对象的坐标。

Like this :(
                {
            x = 385;
            y = 249;
        },
                {
            x = 448;
            y = 242;
        },
                {
            x = 454;
            y = 276;
        },
                {
            x = 391;
            y = 284;
        }
    );

我将图像视图设置为纵横比适合，因此图像的实际尺寸会有所不同，因此根据纵横比适合大小，我需要更改坐标以适应纵横比适合尺寸图像。

这是我试过的代码。

var topLeftXOne = point[0]["x"] as! CGFloat
var topLeftYOne = point[0]["y"] as! CGFloat
var topRightXOne = point[1]["x"] as! CGFloat
var topRightYOne = point[1]["y"] as! CGFloat
var bottomtopRightXOne = point[2]["x"] as! CGFloat
var bottomRightYOne = point[2]["y"] as! CGFloat
                            
 var bottomLeftXOne = point[3]["x"] as! CGFloat
 var bottomLeftYOne = point[3]["y"] as! CGFloat
    
  let pointsView = ALPDView(frame: CGRect.zero)
  let x: CGRect = AVMakeRect(aspectRatio: image.size, insideRect: pointsView.imageView.frame)
    
 let scaleX = image.size.width / x.width
 let scaleY = image.size.height / x.height
                            
 topLeftXOne = topLeftXOne / scaleX
 topLeftYOne = topLeftYOne / scaleY
                            
 topRightXOne = topRightXOne / scaleX
 topRightYOne = topRightYOne / scaleY
                            
 bottomtopRightXOne = bottomtopRightXOne / scaleX
 bottomRightYOne = bottomRightYOne / scaleY
                            
 bottomLeftXOne = bottomLeftXOne / scaleX
 bottomLeftYOne = bottomLeftYOne / scaleY

但是我没有得到正确的结果。

这例如image ，我想更改坐标以适合纵横比图像大小。

Answer 1

最后我用比率法实现了。我取了图片尺寸的纵横比，按照ratio math计算。

让 x: CGRect = AVMakeRect(aspectRatio: image.size, insideRect: pointsView.imageView.frame)

让scaleX = image.size.width / x.width

让scaleY = image.size.height / x.height

                        var topLeftXOne = point[0]["x"] as! CGFloat
                        var topLeftYOne = point[0]["y"] as! CGFloat

                        var topRightXOne = point[1]["x"] as! CGFloat
                        var topRightYOne = point[1]["y"] as! CGFloat

                        var bottomtopRightXOne = point[2]["x"] as! CGFloat
                        var bottomRightYOne = point[2]["y"] as! CGFloat

                        var bottomLeftXOne = point[3]["x"] as! CGFloat
                        var bottomLeftYOne = point[3]["y"] as! CGFloat

                        let pointsView = ALPDView(frame: CGRect.init(x: 0, y: 0, width:self.view.frame.size.width , height: self.view.frame.size.height))

                        let additionValueForX = x.origin.x + 20
                        let additionValueForY = x.origin.y - 40

                        topLeftXOne = topLeftXOne / scaleX + additionValueForX
                        topLeftYOne = topLeftYOne / scaleY + additionValueForY

                        topRightXOne = topRightXOne / scaleX + additionValueForX
                        topRightYOne = topRightYOne / scaleY + additionValueForY

                        bottomtopRightXOne = bottomtopRightXOne / scaleX + additionValueForX
                        bottomRightYOne = bottomRightYOne / scaleY + additionValueForY

                        bottomLeftXOne = bottomLeftXOne / scaleX + additionValueForX
                        bottomLeftYOne = bottomLeftYOne / scaleY + additionValueForY

将真实图像坐标转换为纵横比？

Convert real image coordinates to aspect fit?

uiimage

cgpoint

ios

uibezierpath

swift