Trabajando con Transparencia | C++

Establecer máscara de opacidad

Establecer objeto de máscara de opacidad

Es posible configurar una máscara de opacidad en un documento XPS. Aspose.Page para C++ se puede utilizar para crear/leer un documento XPS y establecer una máscara de opacidad en dichos documentos. La API usa la imagen como una máscara de opacidad donde el componente Alfa de cada píxel se usa para aplicar sobre el relleno subyacente. El documento XPS resultante mostrará franjas de degradado inclinadas presentes sobre el archivo de imagen de origen. Para configurar la máscara de opacidad en un documento XPS, se pueden seguir los siguientes pasos.

1. Cree un nuevo objeto de la clase XpsDocument
2. Agregue un lienzo al objeto del documento usando la clase XpsCanvas.
3. Cree una clase de objeto XpsPath con los parámetros requeridos
4. Establece la máscara de opacidad en el camino.
5. Cree un objeto de clase XpsImageBrush
6. Guarde el documento en el disco utilizando el método Guardar.

For complete examples and data files, please go to https://github.com/aspose-page/Aspose.Page-for-C
// Create new XPS Document
System::SharedPtr<XpsDocument> doc = System::MakeObject<XpsDocument>();
//Add Canvas to XpsDocument instance
System::SharedPtr<XpsCanvas> canvas = doc->AddCanvas();
// Rectangle with opacity masked by ImageBrush
System::SharedPtr<XpsPath> path = canvas->AddPath(doc->CreatePathGeometry(u"M 10,180 L 228,180 228,285 10,285"));
path->set_Fill(doc->CreateSolidColorBrush(doc->CreateColor(1.0f, 0.0f, 0.0f)));
path->set_OpacityMask(doc->CreateImageBrush(dataDir() + u"R08SY_NN.tif", System::Drawing::RectangleF(0.f, 0.f, 128.f, 192.f), System::Drawing::RectangleF(0.f, 0.f, 64.f, 96.f)));
(System::DynamicCast<Aspose::Page::Xps::XpsModel::XpsImageBrush>(path->get_OpacityMask()))->set_TileMode(Aspose::Page::Xps::XpsModel::XpsTileMode::Tile);
// Save resultant XPS document
doc->Save(outDir() + u"OpacityMask_out.xps");

Agregar objeto transparente dentro del documento XPS

Agregar objeto transparente

Aspose.Page para C++ le permite agregar objetos transparentes a un documento XPS en sus aplicaciones. La clase XpsPath se utiliza para lograr esto usando código simple. Para agregar un objeto transparente al documento XPS, se pueden seguir los siguientes pasos.

1. Cree un nuevo objeto usando la clase XpsDocument
2. Cree un objeto XpsPath con los parámetros requeridos.
3. Establecer información de transformación de renderizado para la ruta.
4. Utilice el método set_Opacity para especificar el valor de opacidad.
5. Guarde el documento XPS utilizando el método Guardar.

For complete examples and data files, please go to https://github.com/aspose-page/Aspose.Page-for-C
// Create new XPS Document
auto doc = System::MakeObject<XpsDocument>();

// Just to demonstrate transparency
doc->AddPath(doc->CreatePathGeometry(u"M120,0 H400 v1000 H120"))->set_Fill(doc->CreateSolidColorBrush(System::Drawing::Color::get_Gray()));
doc->AddPath(doc->CreatePathGeometry(u"M300,120 h600 V420 h-600"))->set_Fill(doc->CreateSolidColorBrush(System::Drawing::Color::get_Gray()));

// Create path with closed rectangle geometry
System::SharedPtr<XpsPath> path1 = doc->CreatePath(doc->CreatePathGeometry(u"M20,20 h200 v200 h-200 z"));
// Set blue solid brush to fill path1
path1->set_Fill(doc->CreateSolidColorBrush(System::Drawing::Color::get_Blue()));
// Add it to the current page
System::SharedPtr<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->set_Fill(doc->CreateSolidColorBrush(System::Drawing::Color::get_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 ...
System::SharedPtr<XpsPath> path3 = doc->Add(path2);
// ... and we shift it 300 units lower ...
path3->set_RenderTransform(doc->CreateMatrix(1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 300.0f));
// ... and set red solid brush to fill it
path3->set_Fill(doc->CreateSolidColorBrush(System::Drawing::Color::get_Red()));

// Create new path4 with path2's geometry ...
System::SharedPtr<XpsPath> path4 = doc->AddPath(path2->get_Data());
// ... shift it 300 units to the right ...
path4->set_RenderTransform(doc->CreateMatrix(1.0f, 0.0f, 0.0f, 1.0f, 300.0f, 0.0f));
// ... and set blue solid fill
path4->set_Fill(doc->CreateSolidColorBrush(System::Drawing::Color::get_Blue()));

// Add path4 once again.
System::SharedPtr<XpsPath> path5 = doc->Add(path4);
// path4 and path5 are not the same again ...
// (move path5 300 units lower)
path5->set_RenderTransform(path5->get_RenderTransform()->Clone());
// to disconnect RenderTransform value from path4 (see next comment about Fill property)
path5->get_RenderTransform()->Translate(0.0f, 300.0f);
// ... 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->get_Fill()->set_Opacity(0.8f);

// Create new path6 with path2's geometry ...
System::SharedPtr<XpsPath> path6 = doc->AddPath(path2->get_Data());
// ... shift it 600 units to the right ...
path6->set_RenderTransform(doc->CreateMatrix(1.0f, 0.0f, 0.0f, 1.0f, 600.0f, 0.0f));
// ... and set yellow solid fill
path6->set_Fill(doc->CreateSolidColorBrush(System::Drawing::Color::get_Yellow()));

// Now add path6's clone ...
System::SharedPtr<XpsPath> path7 = doc->Add(path6->Clone());
// (move path5 300 units lower)
path7->set_RenderTransform(path7->get_RenderTransform()->Clone());
path7->get_RenderTransform()->Translate(0.0f, 300.0f);
// ... and set opacity for path7
path7->get_Fill()->set_Opacity(0.8f);
// Now opacity effects independantly 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;

// Save resultant XPS document
doc->Save(outDir() + u"WorkingWithTransparency_out.xps");

El resultado así