private void GetCutImage()
{
int tempLeft = (int)Canvas.GetLeft(rectangle);
int tempTop = (int)Canvas.GetTop(rectangle);
int tempWidth = (int)rectangle.Width;
int tempHeight = (int)rectangle.Height;
System.Drawing.Image currentImage;
System.Drawing.Image processImage;
//currentImage = System.Drawing.Image.FromFile(@"D:\公司项目\测试的代码\CutImageTest\CutImageTest\10.jpg");
currentImage = ImageWork.ImageSourceToBitmap(sourceImg.Source);//获取原图片
System.Drawing.Rectangle SelectedRect = new Rectangle(tempLeft, tempTop, tempWidth, tempHeight);
System.Drawing.Rectangle _selectedRect = MapSelectedRegion(sourceImg, SelectedRect, currentImage);
//System.Drawing.Rectangle _selectedRect = new System.Drawing.Rectangle(tempLeft, tempTop, tempWidth, tempHeight);
processImage = ImageWork.ClipImage(currentImage,
_selectedRect,
(int)targetImg.Width,
(int)targetImg.Height,
System.Drawing.Color.Black
);
Bitmap bmp = new Bitmap(processImage); // get bitmap
BitmapImage bmpResource = ImageWork.BitmapToBitmapImage(bmp);
targetImg.Source = bmpResource;
}
/// <summary>
/// 计算选择区域的缩放比例
/// </summary>
/// <param name="MapPbx"></param>
/// <param name="MapRect"></param>
/// <param name="SourceImage"></param>
/// <returns></returns>
private System.Drawing.Rectangle MapSelectedRegion(FrameworkElement MapPbx, System.Drawing.Rectangle MapRect, System.Drawing.Image SourceImage)
{
#region Determine the originally used mapping offsets and dimensions
int targetMapOffsetX = 0;
int targetMapOffsetY = 0;
int targetMapWidth = 0;
int targetMapHeight = 0;
float dummyMapRatio = 0f;
int tempWidth = (int)MapPbx.ActualWidth;
int tempHeight = (int)MapPbx.ActualHeight;
ImageWork.FixedSize_ResizeRatios(SourceImage.Width, SourceImage.Height, tempWidth, tempHeight, ref targetMapOffsetX, ref targetMapOffsetY, ref targetMapWidth, ref targetMapHeight, ref dummyMapRatio);
#endregion
#region Compute mapped .Left and .Width
double dMapPbxWidth = (double)targetMapWidth;
double xLeft = (double)MapRect.Left;
double xWidth = (double)MapRect.Width;
if (targetMapOffsetX > 0)
{
double dOffsetX = (double)targetMapOffsetX;
double dOffsetWidth = (double)targetMapWidth;
if (xLeft < dOffsetX)
{
xLeft = 0;
}
else
{
xLeft -= dOffsetX;
}
double xRight = (double)MapRect.Right - dOffsetX;
if (xRight > dOffsetWidth)
{
xRight = dOffsetWidth;
}
xWidth = xRight - xLeft;
if (xWidth > dMapPbxWidth)
{
xWidth = dMapPbxWidth;
}
}
int _mappedRect_Left = (int)((double)SourceImage.Width * (xLeft / dMapPbxWidth));
int _mappedRect_Width = (int)((double)SourceImage.Width * (xWidth / dMapPbxWidth));
#endregion
#region Compute mapped .Top and .Height
double dMapPbxHeight = (double)targetMapHeight;
double yTop = (double)MapRect.Top;
double yHeight = (double)MapRect.Height;
if (targetMapOffsetY > 0)
{
double dOffsetY = (double)targetMapOffsetY;
double dOffsetHeight = (double)targetMapHeight;
if (yTop < dOffsetY)
{
yTop = 0;
}
else
{
yTop -= dOffsetY;
}
double yBottom = (double)MapRect.Bottom - dOffsetY;
if (yBottom > dOffsetHeight)
{
yBottom = dOffsetHeight;
}
yHeight = yBottom - yTop;
if (yHeight > dMapPbxHeight)
{
yHeight = dMapPbxHeight;
}
}
int _mappedRect_Top = (int)((double)SourceImage.Height * (yTop / dMapPbxHeight));
int _mappedRect_Height = (int)((double)SourceImage.Height * (yHeight / dMapPbxHeight));
#endregion
return(new System.Drawing.Rectangle(_mappedRect_Left, _mappedRect_Top, _mappedRect_Width, _mappedRect_Height));
}
