实现能够调节瞳距的关键步骤

SwiftProject/SwiftProject/Project/Util/PlayByTransferConvertor.swift

@@ -176,6 +176,41 @@ class PlayByTransferConvertor {
     
     //将两张图片合成一张图片
     func joinImages( leftImage:CIImage, rightImage:CIImage) -> CIImage {
+        let scale = 0.7//此处必须大于0.5
+        
+        let left =  UIImage(ciImage: leftImage )
+        let right =  UIImage(ciImage: rightImage )
+        
+        let imageWidth = left.size.width/2
+        let imageHeight = left.size.height
+        
+        let n_left = getImgWithScale(image: left, scale: scale - 0.5)
+        let n_right = getImgWithScale(image: right, scale: scale - 0.5)
+        
+        
+        let newImageSize = left.size //CGSize(width:imageWidth, height: left.size.height);
+        UIGraphicsBeginImageContextWithOptions(newImageSize, false, 1);
+        n_left.draw(in: CGRect(x:0, y:0, width:imageWidth, height:imageHeight))
+        n_right.draw(in: CGRect(x:imageWidth, y:0, width:imageWidth, height:imageHeight))
+        let image = UIGraphicsGetImageFromCurrentImageContext()!
+        UIGraphicsEndImageContext();
+        
+        let ci = CIImage(cgImage: image.cgImage!)
+        return ci
+    }
+    
+    func getImgWithScale(image:UIImage,scale:CGFloat) -> UIImage {
+        let dRect = CGSizeMake(image.size.width*0.5, image.size.height)
+        let imgWidth = image.size.width*scale
+        let imgHeight = image.size.height*scale
+        UIGraphicsBeginImageContextWithOptions(dRect, false, 1);
+        image.draw(in: CGRectMake((dRect.width - imgWidth)*0.5, (dRect.height - imgHeight)*0.5, imgWidth, imgHeight))
+        let newImage = UIGraphicsGetImageFromCurrentImageContext()!
+        UIGraphicsEndImageContext();
+        return newImage
+    }
+    
+    func joinImages_backup( leftImage:CIImage, rightImage:CIImage) -> CIImage {
         let left =  UIImage(ciImage: leftImage )
         let right =  UIImage(ciImage: rightImage )