PDFSharp转换问题

问题描述：

使用缩放转换在使用不同比例绘制时发现了PDFSharp存在的问题。PDFSharp转换问题

在此示例中，我们绘制两个不同比例的矩形，从FixedDocumentSequence生成XPS，最后使用PDFsharps XPS转换器将XPS转换为PDF。

var visual = new DrawingVisual(); 
DrawingContext dc = visual.RenderOpen(); 

// Setup transformations. 
dc.PushTransform(new TranslateTransform(0, 1122.0)); 
dc.PushTransform(new ScaleTransform(3.77857136726379, -3.77857136726379)); 
dc.PushTransform(new TranslateTransform(-1719.41186523438, -1410.32360839844)); 
dc.PushTransform(new ScaleTransform(0.0117647061124444, 0.0117647061124444)); 

// Draw red rectangle. 
var redPen = new Pen(Brushes.Red, 1); 
var rectGeo1 = new RectangleGeometry(new Rect(160000, 130000, 8000, 5000)); 
dc.DrawGeometry(Brushes.Transparent, redPen, rectGeo1); 

// Pop two transformations. 
dc.Pop(); 
dc.Pop(); 

// Draw blue rectangle. 
var bluePen = new Pen(Brushes.Blue, 0.5); 
var rectGeo2 = new RectangleGeometry(new Rect(12, 12, 150.9408, 107.088539)); 
dc.DrawGeometry(Brushes.Transparent, bluePen, rectGeo2); 
dc.Close(); 

// Generate XPS from DocumentSequence. 
var a3Size = new Size(1587, 1123); 
var docSeq = CreateDocumentSequence(a3Size, visual); 
string dirPath = @"C:\Temp\"; 
string xpsFilePath = dirPath + "test.xps"; 
string pdfFilePath = dirPath + "test.pdf"; 
WriteXpsFile(docSeq, xpsFilePath); 

// Generate PDF from XPS (PdfSharp) 
XpsConverter.Convert(xpsFilePath, pdfFilePath, 0);

完整的程序，可以发现here和VS溶液here。

红色矩形预计将与蓝色矩形的右上角对齐。这就是我们得到的生成XPS看时：