在 XPS 文件中使用透明度 | Java

在 XPS 文档中添加透明对象

Aspose.Page for Java 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 PathGeometry 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：

// For complete examples and data files, please go to https://github.com/aspose-page/Aspose.Page-for-Java
// The path to the documents directory.
String dataDir = Utils.getDataDir();
// Initialize document
XpsDocument doc = new XpsDocument();
// Just to demonstrate transparency
doc.addPath(doc.createPathGeometry("M120,0 H400 v1000 H120")).setFill(doc.createSolidColorBrush(Color.GRAY));
doc.addPath(doc.createPathGeometry("M300,120 h600 V420 h-600")).setFill(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.setFill(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.setFill(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.setRenderTransform(doc.createMatrix(1, 0, 0, 1, 0, 300));
// ... and set red solid brush to fill it
path3.setFill(doc.createSolidColorBrush(Color.RED));

// Create new path4 with path2's geometry ...
XpsPath path4 = doc.addPath(path2.getData());
// ... shift it 300 units to the right ...
path4.setRenderTransform(doc.createMatrix(1, 0, 0, 1, 300, 0));
// ... and set blue solid fill
path4.setFill(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.setRenderTransform(path5.getRenderTransform().deepClone()); // to disconnect RenderTransform value from path4 (see next comment about Fill property)
path5.getRenderTransform().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.getFill().setOpacity(0.8f);

// Create new path6 with path2's geometry ...
XpsPath path6 = doc.addPath(path2.getData());
// ... shift it 600 units to the right ...
path6.setRenderTransform(doc.createMatrix(1, 0, 0, 1, 600, 0));
// ... and set yellow solid fill
path6.setFill(doc.createSolidColorBrush(Color.YELLOW));

// Now add path6's clone ...
XpsPath path7 = doc.add(path6.deepClone());
// (move path5 300 units lower)
path7.setRenderTransform(path7.getRenderTransform().deepClone());
path7.getRenderTransform().translate(0, 300);
// ... and set opacity for path7
path7.getFill().setOpacity(0.8f);
// Now opacity effects independently as soon as property values are cloned along with the element

// The following code block is equivalent to the previous one.
// Add path6 itself. path6 and path7 are not the same. Although their Fill property values are the same 
//XpsPath path7 = doc.Add(path6);
//path7.RenderTransform = path7.RenderTransform.Clone();
//path7.RenderTransform.Translate(0, 300);
// To "disconnect" path7's Fill property from path6's Fill property reassign it to its clone (or path6's Fill clone)
//path7.Fill = ((XpsSolidColorBrush)path7.Fill).Clone();
//path7.Fill.Opacity = 0.8f;

doc.save(dataDir + "WorkingWithTransparency_out.xps");

请参阅 .NET 和 C++ 中 XPS 文档透明度的使用方法。

结果

设置不透明蒙版

解决方案提供了 setOpacityMask() 属性，您可以使用它在 XPS 文档中设置不透明蒙版。您需要创建 PathGeometry 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。以下代码片段显示了设置不透明度蒙版的完整功能：

// For complete examples and data files, please go to https://github.com/aspose-page/Aspose.Page-for-Java
// The path to the documents directory.
String dataDir = Utils.getDataDir();
// Create a new XPS document
XpsDocument doc = new XpsDocument();
// New canvas
XpsCanvas canvas = doc.addCanvas();
// Rectangle in the middle left with opacity masked by ImageBrush
XpsPath path = canvas.addPath(doc.createPathGeometry("M 10,180 L 228,180 228,285 10,285"));
path.setFill(doc.createSolidColorBrush(doc.createColor(1.0f, 0.0f, 0.0f)));
path.setOpacityMask(doc.createImageBrush(dataDir +  "R08SY_NN.tif", 
                new Rectangle2D.Float(0f, 0f, 128f, 192f),	new Rectangle2D.Float(0f, 0f, 64f, 96f)));
((XpsImageBrush)path.getOpacityMask()).setTileMode(XpsTileMode.Tile);
// Save resultant XPS document
doc.save(dataDir + "OpacityMask_out.xps");

请参阅 .NET 和 C++ 中 XPS 文档透明度的使用方法。

结果

您可以从 GitHub下载示例和数据文件。