在 XPS 文件中使用透明度 | .NET

在 XPS 中设置不透明蒙版

设置不透明蒙版对象

Aspose.Page for .NET 提供 OpacityMask 属性，用于在 XPS 路径上设置不透明蒙版。您需要指定 XpsPathGeometry 并将其添加到 XpsPath。图像可用作不透明蒙版，每个像素的 Alpha 分量用于覆盖底层填充。 生成的 XPS 文档将在源图像文件上显示倾斜的渐变条纹。以下代码片段展示了设置不透明蒙版的完整功能：

// Apply opacity mask for texture pattern in XPS document.

// Create new XPS Document
XpsDocument doc = new XpsDocument();

string outputFileName = "OpacityMask_out.xps";

//Add Canvas to XpsDocument instance
XpsCanvas canvas = doc.AddCanvas();
// Rectangle with opacity masked by ImageBrush
XpsPath path = canvas.AddPath(doc.CreatePathGeometry("M 10,180 L 228,180 228,285 10,285"));
path.Fill = doc.CreateSolidColorBrush(doc.CreateColor(1.0f, 0.0f, 0.0f));
path.OpacityMask = doc.CreateImageBrush(DataDir + "R08SY_NN.tif", new RectangleF(0f, 0f, 128f, 192f),
    new RectangleF(0f, 0f, 64f, 96f));
((XpsImageBrush)path.OpacityMask).TileMode = XpsTileMode.Tile;
// Save resultant XPS document
doc.Save(OutputDir + outputFileName);

请参阅 Java 和 C++ 中 XPS 文档透明度的使用方法。

结果

在 XPS 文档中添加透明对象

添加透明对象

解决方案提供了 XpsPath 类，您可以使用它在 XPS 文档中添加透明对象。您需要指定 XpsPathGeometry 并将其添加到 XpsPath。以下代码片段展示了在 XPS 文档中添加透明对象的完整功能：

// Demonstrates transparency in shapes in XPS document.

// Create new XPS Document
XpsDocument doc = new XpsDocument();

string outputFileName = "AddTransparentObject_outXPS.xps";

// Just to demonstrate transparency
doc.AddPath(doc.CreatePathGeometry("M120,0 H400 v1000 H120")).Fill = doc.CreateSolidColorBrush(Color.Gray);
doc.AddPath(doc.CreatePathGeometry("M300,120 h600 V420 h-600")).Fill = doc.CreateSolidColorBrush(Color.Gray);

// Create path with closed rectangle geometry
XpsPath path1 = doc.CreatePath(doc.CreatePathGeometry("M20,20 h200 v200 h-200 z"));
// Set blue solid brush to fill path1
path1.Fill = doc.CreateSolidColorBrush(Color.Blue);
// Add it to the current page
XpsPath path2 = doc.Add(path1);

// path1 and path2 are the same as soon as path1 hasn't been placed inside any other element
// (which means that path1 had no parent element).
// Because of that rectangle's color on the page effectively turns to green
path2.Fill = doc.CreateSolidColorBrush(Color.Green);

// Now add path2 once again. Now path2 has parent. So path3 won't be the same as path2.
// Thus a new rectangle is painted on the page ...
XpsPath path3 = doc.Add(path2);
// ... and we shift it 300 units lower ...
path3.RenderTransform = doc.CreateMatrix(1, 0, 0, 1, 0, 300);
// ... and set red solid brush to fill it
path3.Fill = doc.CreateSolidColorBrush(Color.Red);

// Create new path4 with path2's geometry ...
XpsPath path4 = doc.AddPath(path2.Data);
// ... shift it 300 units to the right ...
path4.RenderTransform = doc.CreateMatrix(1, 0, 0, 1, 300, 0);
// ... and set blue solid fill
path4.Fill = doc.CreateSolidColorBrush(Color.Blue);

// Add path4 once again.
XpsPath path5 = doc.Add(path4);
// path4 and path5 are not the same again ...
// (move path5 300 units lower)
path5.RenderTransform = path5.RenderTransform.Clone(); // to disconnect RenderTransform value from path4 (see next comment about Fill property)
path5.RenderTransform.Translate(0, 300);
// ... but if we set the opacity of Fill property, it will take effect on both path5 and path4
// because brush is a complex property value which remains the same for path5 and path4
path5.Fill.Opacity = 0.8f;

// Create new path6 with path2's geometry ...
XpsPath path6 = doc.AddPath(path2.Data);
// ... shift it 600 units to the right ...
path6.RenderTransform = doc.CreateMatrix(1, 0, 0, 1, 600, 0);
// ... and set yellow solid fill
path6.Fill = doc.CreateSolidColorBrush(Color.Yellow);

// Now add path6's clone ...
XpsPath path7 = doc.Add(path6.Clone());
// (move path5 300 units lower)
path7.RenderTransform = path7.RenderTransform.Clone();
path7.RenderTransform.Translate(0, 300);
// ... and set opacity for path7
path7.Fill.Opacity = 0.8f;
// Now opacity effects independantly as soon as property values are cloned along with the element

// Save resultant XPS document
doc.Save(OutputDir + outputFileName);

请参阅 Java 和 C++ 中 XPS 文档透明度的处理。

结果

您可以从 GitHub下载示例和数据文件。