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Pennelli XPS OM

  • Articolo

In questo argomento viene descritto come usare diversi tipi di pennelli in un file XPS OM.

I pennelli nell'OM XPS si basano sull'interfaccia IXpsOMBrush e includono quanto segue:

Pennelli riquadro

Pennelli sfumato

Esempi di codice

Creare un pennello a tinta unita

Nell'esempio di codice seguente viene creato un pennello a tinta unita da un valore di colore definito nel codice.

    HRESULT                hr = S_OK;

    XPS_COLOR              xpsColor;
    IXpsOMSolidColorBrush  *brush;

    // creates a solid red brush
    xpsColor.colorType = XPS_COLOR_TYPE_SRGB;
    xpsColor.value.sRGB.alpha = 0xFF;
    xpsColor.value.sRGB.red = 0xFF;
    xpsColor.value.sRGB.green = 0x00;
    xpsColor.value.sRGB.blue = 0x00;

    hr = xpsFactory->CreateSolidColorBrush(
       &xpsColor, 
       NULL, 
       reinterpret_cast<IXpsOMSolidColorBrush**>(&brush));
    
    // use brush

    // when finished with brush, release pointer
    brush->Release();

Creare un pennello visivo

Nell'esempio di codice seguente viene creato un pennello da un oggetto visivo.

    HRESULT                       hr = S_OK;
    IXpsOMVisualBrush             *brush;

    XPS_RECT viewBoxRect = {0,0,0,0};
    XPS_RECT viewPortRect = {0,0,0,0};

    // set viewBoxRect to define the portion of the visual to use
    // as the brush.
    //
    // set viewPortRect to define the location and size of the 
    // the brush in the destination 
    //
    // create the brush
    hr = xpsFactory->CreateVisualBrush (
        &viewBoxRect,
        &viewPortRect,
        reinterpret_cast<IXpsOMVisualBrush**>(&brush));

    // assign the visual object
    //   brushVisual points to a visual
    //   that is defined outside of this example

    hr = brush->SetVisualLocal (brushVisual);
    
    // use brush
    
    // when finished with brush, release pointer
    brush->Release();

Creare un pennello immagine

Fare riferimento all'esempio di codice in Place Images in an XPS OM .Refer to the code example in Place Images in an XPS OM.Refer to the code example in Place Images in an XPS OM.

Creare un pennello con sfumatura lineare

Nell'esempio di codice seguente viene creato un pennello con sfumatura lineare. La sfumatura ha due interruzioni sfumature.

    HRESULT                       hr = S_OK;
    XPS_COLOR                     xpsColorStop;
    IXpsOMGradientStop            *xpsGradientStop1, *xpsGradientStop2;
    IXpsOMLinearGradientBrush     *brush;
    XPS_POINT                     startPoint, endPoint;

    // define the start color
    xpsColorStop.colorType        = XPS_COLOR_TYPE_SRGB;
    xpsColorStop.value.sRGB.alpha = 0xFF;
    xpsColorStop.value.sRGB.red   = 0xE4;
    xpsColorStop.value.sRGB.green = 0x3B;
    xpsColorStop.value.sRGB.blue  = 0x2F;
    
    // create a gradient stop by setting the color and location 
    // for the beginning of the gradient
    hr = xpsFactory->CreateGradientStop(
        &xpsColorStop, 
        NULL, 
        0.0f,
        &xpsGradientStop1);
    startPoint.x = 375.75f;
    startPoint.y = 18.0f;

    // define the end color
    xpsColorStop.colorType        = XPS_COLOR_TYPE_SRGB;
    xpsColorStop.value.sRGB.alpha = 0xFF;
    xpsColorStop.value.sRGB.red   = 0xEF;
    xpsColorStop.value.sRGB.green = 0x79;
    xpsColorStop.value.sRGB.blue  = 0x2F;

    // create a gradient stop by setting the color and  location
    //  for the end of the gradient
    hr = xpsFactory->CreateGradientStop(
        &xpsColorStop,
        NULL, 
        1.0f, 
        &xpsGradientStop2);
    endPoint.x   = 375.75f;
    endPoint.y   = 134.6f;

    // create the brush
    hr = xpsFactory->CreateLinearGradientBrush(
        xpsGradientStop1, 
        xpsGradientStop2, 
        &startPoint, 
        &endPoint, 
        &brush);
    // release gradient stops after creating brush
    xpsGradientStop1->Release();
    xpsGradientStop2->Release();

    // when finished with brush, release pointer to brush
    brush->Release();

Interfaccia IXpsOMGradientBrush

Interfaccia IXpsOMImageBrush

Interfaccia IXpsOMLinearGradientBrush

Interfaccia IXpsOMRadialGradientBrush

Interfaccia IXpsOMSolidColorBrush

Interfaccia IXpsOMTileBrush

Interfaccia IXpsOMVisualBrush

XPS_COLOR

Specifica di carta XML