将 DWG/DXF 图纸和布局导出为指定尺寸

将模型和所有布局导出为 A4 PDF 尺寸

Aspose.CAD API 允许您将 DWG/DXF 文件的所有工作表导出为指定的物理 PDF 尺寸。 以下示例代码设置 CadRasterizationOptions 对象的尺寸，以实现所需的 PDF 尺寸。 A4 纸张的尺寸为 210x297 毫米或 8.27x11.69 英寸，这些值在代码中使用。

CadRasterizationOptions cadRasterizationOptions = new CadRasterizationOptions();

boolean isMetric = false;
double coefficient = 1.0;

switch (cadImage.getUnitType())
{

// it is possible to extend this with more types that may appear in drawings
    case UnitType.Meter:
        isMetric = true;
        coefficient = 1.0;
        break;
    case UnitType.Millimeter:
        isMetric = true;
        coefficient = 0.001;
        break;
    case UnitType.Inch:
        coefficient = 1.0;
        break;
}

SizeF size;
if (isMetric)
{
    double metersCoeff = 1 / 1000.0;
    double scaleFactor = metersCoeff / coefficient;
    size = new SizeF((float)(210 * scaleFactor), (float)(297 * scaleFactor));
    cadRasterizationOptions.setUnitType(UnitType.Millimeter);
}
else
{
    size = new SizeF((float)(8.3f / coefficient), (float)(11.7f / coefficient));
    cadRasterizationOptions.setUnitType(UnitType.Inch);
}

cadRasterizationOptions.setPageSize(size);

以不同尺寸导出 CAD 布局到 PDF

有时需要将布局导出为其物理尺寸。下面的示例演示将绘图导出为多页 PDF，其中每一页都包含其布局内容，并具有自己的物理 PDF 尺寸。此示例使用 getLayoutPageSizes 属性。

CadRasterizationOptions cadRasterizationOptions = new CadRasterizationOptions();

for (String layoutName : cadImage.getLayouts().getKeysTyped())
{
    CadLayout layout = cadImage.getLayouts().get(layoutName);
    if (layout.getLayoutName() == "Model") continue;
System.out.println(layout.getLayoutName());
    SizeF pageSize = GetPageSizeFromLayout(layout);
    cadRasterizationOptions.getLayoutPageSizes().put(layout.getLayoutName(), pageSize);
}

private static SizeF GetPageSizeFromLayout(CadLayout layout)
{
    boolean isLandscape = IsLayoutLandscape(layout);

    float pageWidth;
    float pageHeight;

    if (layout.getPlotPaperUnits() == CadPlotPaperUnits.PlotInInches)
    {
        pageWidth = (float)MillimetersToInches(layout.getPlotPaperSize().getWidth());
        pageHeight = (float)MillimetersToInches(layout.getPlotPaperSize().getHeight());
    }
    else
    {
        pageWidth = (float)layout.getPlotPaperSize().getWidth();
        pageHeight = (float)layout.getPlotPaperSize().getHeight();
    }

    if (isLandscape)
    {
        return new SizeF(pageHeight, pageWidth);
    }
    else
    {
        return new SizeF(pageWidth, pageHeight);
    }
}

private static boolean IsLayoutLandscape(CadLayout layout)
{
    short plotRotation = layout.getPlotRotation();
    return plotRotation == CadPlotRotation.Clockwise90Degrees || plotRotation == CadPlotRotation.Counterclockwise90Degrees;
}

private static double MillimetersToInches(double millimeters)
{
    double MillimetersToInchesFactor = 0.0393701;
    return millimeters * MillimetersToInchesFactor;
}