Windows Phone 8.1 中的裁剪图像问题

Posted 2023-02-25

【中文标题】Windows Phone 8.1 中的裁剪图像问题

【英文标题】：problems with crop image in Windows Phone 8.1

【发布时间】：2014-10-21 23:57:58

【问题描述】：

我正在 Windows Phone 8.1 Visual Studio 2013 中制作一个应用程序（不是 Windows Phone Store 应用程序，只是 Windows Phone 应用程序），它可以从 2 张图像中获取全景。我几乎完成了我的申请。但是最后当我想裁剪结果时，我无法从绘制在图像上的矩形发送正确的点。

private void btnCrop_Click(object sender, EventArgs e)
            // Get the size of the source image captured by the camera 
            double originalImageWidth = wbPanoramica.PixelWidth;
            double originalImageHeight = wbPanoramica.PixelHeight;

            // Get the size of the image when it is displayed on the phone 
            double displayedWidth = VisorPicture.ActualWidth;
            double displayedHeight = VisorPicture.ActualHeight;

            // Calculate the ratio of the original image to the displayed image 
            double widthRatio = originalImageWidth / displayedWidth;
            double heightRatio = originalImageHeight / displayedHeight;

            // Calculate the offset of the cropped image. This is the distance, in pixels, to the top left corner 
            // of the cropping rectangle, multiplied by the image size ratio. 
            int xoffset = (int)(((p1.X < p2.X) ? p1.X : p2.X) * widthRatio);
            int yoffset = (int)(((p1.Y < p2.Y) ? p1.Y : p2.X) * heightRatio);
            int X1 = (int)(p1.X * widthRatio);
            int Y1 = (int)(p1.Y * heightRatio);



            var cropped = wbPanoramica.Crop(X1, Y1, yoffset, xoffset);

            wbPanoramica = cropped;
            // Set the source of the image control to the new cropped bitmap
            VisorPicture.Source = wbPanoramica;
            rect.Visibility = Visibility.Collapsed;


            //Enable  accept and reject buttons to save or discard current cropped image.
            //Disable crop button until a new cropping region is selected.
            btnAceptar.IsEnabled = true;
            btnReject.IsEnabled = true;
            btnCortar.IsEnabled = false;

            //Instructional text
            textStatus.Text = "Continue editando la imagen, acepte, o rechace el cambio";
        

【参考方案1】：

我有你的问题。就好像你在裁剪时没有得到准确的像素，对吗？ 我也有类似的问题。我所做的是

wbPanoramica.Height=wbPanoramica.Height/2;
wbPanoramica.Width=wbPanoramica.Width/2;

在传递裁剪像素时，像这样传递它

var cropped = wbPanoramica.Crop(X1*2, Y1*2, yoffset, xoffset);

如果有帮助请告诉我