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：

// Demonstrates transparency in shapes in XPS document.

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

String outputFileName = "AddTransparentObject_outXPS.xps";

// Just to demonstrate transparency - draw background rectangles
doc.addPath(doc.createPathGeometry("M120,0 H400 v1000 H120")).setFill(doc.createSolidColorBrush(doc.createColor(128,128,128)));
doc.addPath(doc.createPathGeometry("M300,120 h600 V420 h-600")).setFill(doc.createSolidColorBrush(doc.createColor(128,128,128)));

// 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(doc.createColor(0, 0, 255)));
// Add it to the current page
XpsPath path2 = doc.add(path1);

// path1 and path2 are the same as long as path1 has no parent. Setting fill on path2 affects shared brush
path2.setFill(doc.createSolidColorBrush(doc.createColor(0, 128, 0)));

// Now add path2 once again. Now path2 has parent. So path3 won't be the same as path2.
XpsPath path3 = doc.add(path2);
// shift it 300 units lower
path3.setRenderTransform(doc.createMatrix(1f, 0f, 0f, 1f, 0f, 300f));
// set red solid brush to fill it
path3.setFill(doc.createSolidColorBrush(doc.createColor(255, 0, 0)));

// Create new path4 with path2's geometry ...
XpsPath path4 = doc.addPath(path2.getData());
// shift it 300 units to the right ...
path4.setRenderTransform(doc.createMatrix(1f, 0f, 0f, 1f, 300f, 0f));
// and set blue solid fill
path4.setFill(doc.createSolidColorBrush(doc.createColor(0, 0, 255)));

// Add path4 once again.
XpsPath path5 = doc.add(path4);
// move path5 300 units lower and disconnect render transform from path4
path5.setRenderTransform(path5.getRenderTransform().deepClone());
path5.getRenderTransform().translate(0f, 300f);
// set the opacity of Fill property - this will affect both path5 and path4 if brush instance is shared
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(1f, 0f, 0f, 1f, 600f, 0f));
// and set yellow solid fill
path6.setFill(doc.createSolidColorBrush(doc.createColor(255, 255, 0)));

// Now add path6's clone ...
XpsPath path7 = doc.add(path6.deepClone());
// move it 300 units lower
path7.setRenderTransform(path7.getRenderTransform().deepClone());
path7.getRenderTransform().translate(0f, 300f);
// set opacity for path7
path7.getFill().setOpacity(0.8f);

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

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：

// 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.setFill(doc.createSolidColorBrush(doc.createColor(255, 0, 0)));
path.setOpacityMask((XpsImageBrush)doc.createImageBrush(getDataDir() + "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(getOutputDir() + outputFileName);

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。