Rasterizing a Vector Drawing

To rasterize a vector drawing, use the Rasterize Method of ImGearVectorPage Class. This creates a copy of the drawing in bitmap form. For example:

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if (igPage is ImGearVectorPage) igPage = ((ImGearVectorPage)igPage).Rasterize();

To control the size of the rasterized bitmap, you can do one of following:

SVG cannot be resized before it's rasterized; SVG doesn't have control parameters, and cannot be resized using the Resize Method. To resize an SVG, you need to rasterize it first, then resize it.

Before loading the vector drawing, set the Width filter control parameter of the format filter used to load the drawing to the desired width of the rasterized image in pixels. The height will be calculated automatically based on the aspect ratio of the drawing. When a width is not specified, the default is used, which is defined by the file format (see File Formats Reference).

CS
VBNET

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using System.IO; using ImageGear.Core; using ImageGear.Formats; public ImGearPage ResizeDWGWithControlParameterAndRasterize(string fileDwg) { // Get all available format filters for DWG. IImGearFormat format = ImGearFileFormats.Filters.Get(ImGearFormats.DWG); // Set width in pixels. format.Parameters.GetByName("Width").Value = 320; ImGearVectorPage vectorPage = null; ImGearPage rasterPage = null; using (FileStream stream = new FileStream(fileDwg, FileMode.Open, FileAccess.Read)) { // Load DWG. vectorPage = (ImGearVectorPage)ImGearFileFormats.LoadPage(stream, 0); // Rasterize using set width. rasterPage = vectorPage.Rasterize(); } return rasterPage; }

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using System.IO;
using ImageGear.Core;
using ImageGear.Formats;
public ImGearPage ResizeDWGWithControlParameterAndRasterize(string fileDwg)
{
    // Get all available format filters for DWG.
    IImGearFormat format = ImGearFileFormats.Filters.Get(ImGearFormats.DWG);
    // Set width in pixels.
    format.Parameters.GetByName("Width").Value = 320;
    ImGearVectorPage vectorPage = null;
    ImGearPage rasterPage = null;
    using (FileStream stream = new FileStream(fileDwg, FileMode.Open, FileAccess.Read))
    {
        // Load DWG.
        vectorPage = (ImGearVectorPage)ImGearFileFormats.LoadPage(stream, 0);
        // Rasterize using set width.
        rasterPage = vectorPage.Rasterize();
    }
    return rasterPage;
}

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Imports System.IO Imports ImageGear.Core Imports ImageGear.Formats Function ResizeDWGWithControlParameterAndRasterize(fileDwg As String) As ImGearPage ' Get all available format filters for DWG. Dim format As IImGearFormat = ImGearFileFormats.Filters.Get(ImGearFormats.DWG) ' Set width in pixels. format.Parameters.GetByName("Width").Value = 320 Dim vectorPage As ImGearVectorPage = Nothing Dim rasterPage As ImGearPage = Nothing Using stream As FileStream = New FileStream(fileDwg, FileMode.Open, FileAccess.Read) ' Load DWG. vectorPage = CType(ImGearFileFormats.LoadPage(stream, 0), ImGearVectorPage) ' Rasterize using set width. rasterPage = vectorPage.Rasterize() End Using Return rasterPage End Function

VB.NET

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Imports System.IO
Imports ImageGear.Core
Imports ImageGear.Formats
Function ResizeDWGWithControlParameterAndRasterize(fileDwg As String) As ImGearPage
    ' Get all available format filters for DWG.
    Dim format As IImGearFormat = ImGearFileFormats.Filters.Get(ImGearFormats.DWG)
    ' Set width in pixels.
    format.Parameters.GetByName("Width").Value = 320
    Dim vectorPage As ImGearVectorPage = Nothing
    Dim rasterPage As ImGearPage = Nothing
    Using stream As FileStream = New FileStream(fileDwg, FileMode.Open, FileAccess.Read)
        ' Load DWG.
        vectorPage = CType(ImGearFileFormats.LoadPage(stream, 0), ImGearVectorPage)
        ' Rasterize using set width.
        rasterPage = vectorPage.Rasterize()
    End Using
    Return rasterPage
End Function

Call the Resize Method of ImGearProcessing Class before calling the Rasterize Method. This will allow you to specify the rasterized dimensions in pixels.

CS
VBNET

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using System.IO; using ImageGear.Core; using ImageGear.Formats; using ImageGear.Processing; public ImGearPage RasterizeAndResizeDWG(string fileDwg, int width) { ImGearVectorPage vectorPage = null; ImGearPage rasterPage = null; using (FileStream stream = new FileStream(fileDwg, FileMode.Open, FileAccess.Read)) { // Load DWG. vectorPage = (ImGearVectorPage)ImGearFileFormats.LoadPage(stream, 0); // Resize to given width using Bicubic Interpolation. int newHeight = width * vectorPage.DIB.Height / vectorPage.DIB.Width; ImGearBicubicInterpolationOptions igBicubicInterpolationOptions = new ImGearBicubicInterpolationOptions(); igBicubicInterpolationOptions.Sharpness = 1.5; ImGearProcessing.Resize(vectorPage, width, newHeight, igBicubicInterpolationOptions); // Rasterize using set width. rasterPage = vectorPage.Rasterize(); } return rasterPage; }

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using System.IO;
using ImageGear.Core;
using ImageGear.Formats;
using ImageGear.Processing;
public ImGearPage RasterizeAndResizeDWG(string fileDwg, int width)
{
    ImGearVectorPage vectorPage = null;
    ImGearPage rasterPage = null;
    using (FileStream stream = new FileStream(fileDwg, FileMode.Open, FileAccess.Read))
    {
        // Load DWG.
        vectorPage = (ImGearVectorPage)ImGearFileFormats.LoadPage(stream, 0);
        // Resize to given width using Bicubic Interpolation.
        int newHeight = width * vectorPage.DIB.Height / vectorPage.DIB.Width;
        ImGearBicubicInterpolationOptions igBicubicInterpolationOptions = new ImGearBicubicInterpolationOptions();
        igBicubicInterpolationOptions.Sharpness = 1.5;
        ImGearProcessing.Resize(vectorPage, width, newHeight, igBicubicInterpolationOptions);
        // Rasterize using set width.
        rasterPage = vectorPage.Rasterize();
    }
    return rasterPage;
}

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Imports System.IO Imports ImageGear.Core Imports ImageGear.Formats Imports ImageGear.Processing Function RasterizeAndResizeDWG(fileDwg As String, width As Integer) As ImGearPage Dim vectorPage As ImGearVectorPage = Nothing Dim rasterPage As ImGearPage = Nothing Using stream As FileStream = New FileStream(fileDwg, FileMode.Open, FileAccess.Read) ' Load DWG. vectorPage = CType(ImGearFileFormats.LoadPage(stream, 0), ImGearVectorPage) ' Resize to given width using Bicubic Interpolation. Dim newHeight As Integer = width * vectorPage.DIB.Height / vectorPage.DIB.Width Dim igBicubicInterpolationOptions As ImGearBicubicInterpolationOptions = New ImGearBicubicInterpolationOptions() igBicubicInterpolationOptions.Sharpness = 1.5 ImGearProcessing.Resize(vectorPage, width, newHeight, igBicubicInterpolationOptions) ' Rasterize using set width. rasterPage = vectorPage.Rasterize() End Using Return rasterPage End Function

VB.NET

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Imports System.IO
Imports ImageGear.Core
Imports ImageGear.Formats
Imports ImageGear.Processing
Function RasterizeAndResizeDWG(fileDwg As String, width As Integer) As ImGearPage
    Dim vectorPage As ImGearVectorPage = Nothing
    Dim rasterPage As ImGearPage = Nothing
    Using stream As FileStream = New FileStream(fileDwg, FileMode.Open, FileAccess.Read)
        ' Load DWG.
        vectorPage = CType(ImGearFileFormats.LoadPage(stream, 0), ImGearVectorPage)
        ' Resize to given width using Bicubic Interpolation.
        Dim newHeight As Integer = width * vectorPage.DIB.Height / vectorPage.DIB.Width
        Dim igBicubicInterpolationOptions As ImGearBicubicInterpolationOptions = New ImGearBicubicInterpolationOptions()
        igBicubicInterpolationOptions.Sharpness = 1.5
        ImGearProcessing.Resize(vectorPage, width, newHeight, igBicubicInterpolationOptions)
        ' Rasterize using set width.
        rasterPage = vectorPage.Rasterize()
    End Using
    Return rasterPage
End Function