AddEllipseToPath Method (GdPicturePDF)

In This Topic

Appends an ellipse, using the sequence of cubic Bézier curves, to the currently constructed path, defined within a currently selected page of the loaded PDF document. Be aware of your currently defined graphics state parameters, that subsequent filling and stroking operations applied onto the constructed path put into effect.

The ellipse is clearly defined by the center and the dimensions of its bounding box. All these coordinates need to be set in the current units defined in the PDF document with respect to the currently located origin, related to the actual page. You can use the GdPicturePDF.GetMeasurementUnit method to determine the currently defined units and you can use the GdPicturePDF.SetMeasurementUnit method to reset the units according to your preference.

Syntax

Visual Basic
C#
Delphi
JScript
Managed Extensions for C++
C++/CLI

'Declaration
 
Public Function AddEllipseToPath( _
   ByVal CenterX As Single, _
   ByVal CenterY As Single, _
   ByVal Width As Single, _
   ByVal Height As Single _
) As GdPictureStatus

public GdPictureStatus AddEllipseToPath( 
   float CenterX,
   float CenterY,
   float Width,
   float Height
)

public function AddEllipseToPath( 
    CenterX: Single;
    CenterY: Single;
    Width: Single;
    Height: Single
): GdPictureStatus;

public function AddEllipseToPath( 
   CenterX : float,
   CenterY : float,
   Width : float,
   Height : float
) : GdPictureStatus;

public: GdPictureStatus AddEllipseToPath( 
   float CenterX,
   float CenterY,
   float Width,
   float Height
)

public:
GdPictureStatus AddEllipseToPath( 
   float CenterX,
   float CenterY,
   float Width,
   float Height
)

Parameters

CenterX: The horizontal (X) coordinate of the ellipse's center, expressed in the current units specified by the SetMeasurementUnit method with respect to the defined origin, related to the currently selected page.
CenterY: The vertical (Y) coordinate of the ellipse's center, expressed in the current units specified by the SetMeasurementUnit method with respect to the defined origin, related to the currently selected page.
Width: The width of the ellipse's bounding box, expressed in the current units specified by the SetMeasurementUnit method.
Height: The height of the ellipse's bounding box, expressed in the current units specified by the SetMeasurementUnit method.

Return Value

A member of the GdPictureStatus enumeration. If the method has been successfully followed, then the return value is GdPictureStatus.OK.

We strongly recommend always checking this status first.

Remarks

This method is only allowed for use with non-encrypted documents.

It is recommended to set the origin's location to be the upper left corner simply by using the GdPicturePDF.SetOrigin method to draw an expected shape of an ellipse, for further explanation please see the first example below.

For further assistance, please see the Path Construction and Painting section of the GdPicturePDF class in the Reference Guide, as well as the Path Construction and Painting section in the PDF Reference.

Example

How to add an ellipse to the currently constructed path.

The first example shows you how the location of the document's origin affects the resulting shape of the drawn ellipse.

VB.NET
C#

Dim caption As String = "Example: AddEllipseToPath"
Dim gdpicturePDF As New GdPicturePDF()
If gdpicturePDF.NewPDF() <> GdPictureStatus.OK Then
    MessageBox.Show("The NewPDF() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
    GoTo [error]
End If
gdpicturePDF.SetMeasurementUnit(PdfMeasurementUnit.PdfMeasurementUnitMillimeter)
gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginTopLeft)
If gdpicturePDF.NewPage(210, 297) <> GdPictureStatus.OK Then
    MessageBox.Show("The NewPage() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
    GoTo [error]
End If
If (gdpicturePDF.SetFillColor(255, 192, 203) <> GdPictureStatus.OK) OrElse
   (gdpicturePDF.AddEllipseToPath(100, 150, 180, 60) <> GdPictureStatus.OK) OrElse
   (gdpicturePDF.FillPath() <> GdPictureStatus.OK) Then
    MessageBox.Show("Painting the first ellipse has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
    GoTo [error]
End If
gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginBottomLeft)
If (gdpicturePDF.SetFillColor(238, 130, 238) <> GdPictureStatus.OK) OrElse
   (gdpicturePDF.AddEllipseToPath(100, 150, 180, 60) <> GdPictureStatus.OK) OrElse
   (gdpicturePDF.FillPath() <> GdPictureStatus.OK) Then
    MessageBox.Show("Painting the second ellipse has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
    GoTo [error]
End If
gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginTopRight)
If (gdpicturePDF.SetFillColor(255, 0, 0) <> GdPictureStatus.OK) OrElse
   (gdpicturePDF.AddEllipseToPath(100, 150, 180, 60) <> GdPictureStatus.OK) OrElse
   (gdpicturePDF.FillPath() <> GdPictureStatus.OK) Then
    MessageBox.Show("Painting the third ellipse has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
    GoTo [error]
End If
gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginBottomRight)
If (gdpicturePDF.SetFillColor(0, 0, 255) <> GdPictureStatus.OK) OrElse
   (gdpicturePDF.AddEllipseToPath(100, 150, 180, 60) <> GdPictureStatus.OK) OrElse
   (gdpicturePDF.FillPath() <> GdPictureStatus.OK) Then
    MessageBox.Show("Painting the fourth ellipse has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
    GoTo [error]
End If
Dim status As GdPictureStatus = gdpicturePDF.SaveToFile("test_AddEllipseToPath1.pdf")
If status = GdPictureStatus.OK Then
    MessageBox.Show("The example has been followed successfully and the file has been saved.", caption)
Else
    MessageBox.Show("The example has been followed successfully, but the file can't be saved. Status: " + status.ToString(), caption)
End If
[error]:
gdpicturePDF.Dispose()

string caption = "Example: AddEllipseToPath";
GdPicturePDF gdpicturePDF = new GdPicturePDF();
if (gdpicturePDF.NewPDF() != GdPictureStatus.OK)
{
    MessageBox.Show("The NewPDF() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
    goto error;
}
gdpicturePDF.SetMeasurementUnit(PdfMeasurementUnit.PdfMeasurementUnitMillimeter);
gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginTopLeft);
if (gdpicturePDF.NewPage(210, 297) != GdPictureStatus.OK)
{
    MessageBox.Show("The NewPage() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
    goto error;
}
if ((gdpicturePDF.SetFillColor(255, 192, 203) != GdPictureStatus.OK) ||
    (gdpicturePDF.AddEllipseToPath(100, 150, 180, 60) != GdPictureStatus.OK) ||
    (gdpicturePDF.FillPath() != GdPictureStatus.OK))
{
    MessageBox.Show("Painting the first ellipse has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
    goto error;
}
gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginBottomLeft);
if ((gdpicturePDF.SetFillColor(238, 130, 238) != GdPictureStatus.OK) ||
    (gdpicturePDF.AddEllipseToPath(100, 150, 180, 60) != GdPictureStatus.OK) ||
    (gdpicturePDF.FillPath() != GdPictureStatus.OK))
{
    MessageBox.Show("Painting the second ellipse has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
    goto error;
}
gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginTopRight);
if ((gdpicturePDF.SetFillColor(255, 0, 0) != GdPictureStatus.OK) ||
    (gdpicturePDF.AddEllipseToPath(100, 150, 180, 60) != GdPictureStatus.OK) ||
    (gdpicturePDF.FillPath() != GdPictureStatus.OK))
{
    MessageBox.Show("Painting the third ellipse has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
    goto error;
}
gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginBottomRight);
if ((gdpicturePDF.SetFillColor(0, 0, 255) != GdPictureStatus.OK) ||
    (gdpicturePDF.AddEllipseToPath(100, 150, 180, 60) != GdPictureStatus.OK) ||
    (gdpicturePDF.FillPath() != GdPictureStatus.OK))
{
    MessageBox.Show("Painting the fourth ellipse has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
    goto error;
}
GdPictureStatus status = gdpicturePDF.SaveToFile("test_AddEllipseToPath1.pdf");
if (status == GdPictureStatus.OK)
    MessageBox.Show("The example has been followed successfully and the file has been saved.", caption);
else
    MessageBox.Show("The example has been followed successfully, but the file can't be saved. Status: " + status.ToString(), caption);
error:
gdpicturePDF.Dispose();

The second example shows you how to draw only a part of your image into a clipping path defined by the shape of an ellipse.

VB.NET
C#

Dim caption As String = "Example: AddEllipseToPath"
Dim gdpicturePDF As New GdPicturePDF()
If (gdpicturePDF.NewPDF() = GdPictureStatus.OK) AndAlso
   (gdpicturePDF.NewPage(PdfPageSizes.PdfPageSizeA4) = GdPictureStatus.OK) Then
    Dim image_name As String = gdpicturePDF.AddJpegImageFromFile("image.jpg")
    If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
        Dim width As Single = gdpicturePDF.GetPageWidth()
        If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
            Dim height As Single = gdpicturePDF.GetPageHeight()
            If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                'the new height of the destination area
                height = height / 2
                If (gdpicturePDF.SelectPage(1) = GdPictureStatus.OK) AndAlso
                   (gdpicturePDF.DrawImage(image_name, 0, height, width, height) = GdPictureStatus.OK) AndAlso
                   (gdpicturePDF.AddEllipseToPath(width / 2, height / 2, width / 2, height / 2) = GdPictureStatus.OK) AndAlso
                   (gdpicturePDF.ClipPath() = GdPictureStatus.OK) AndAlso
                   (gdpicturePDF.DrawImage(image_name, 0, 0, width, height) = GdPictureStatus.OK) Then
                    Dim status As GdPictureStatus = gdpicturePDF.SaveToFile("test_AddEllipseToPath2.pdf")
                    If status = GdPictureStatus.OK Then
                        MessageBox.Show("The example has been followed successfully and the file has been saved.", caption)
                    Else
                        MessageBox.Show("The example has been followed successfully, but the file can't be saved. Status: " + status.ToString(), caption)
                    End If
                Else
                    MessageBox.Show("The example has not been followed successfully." + vbCrLf + "The last known status is " + gdpicturePDF.GetStat().ToString(), caption)
                End If
            Else
                MessageBox.Show("The GetPageHeight() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
            End If
        Else
            MessageBox.Show("The GetPageWidth() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
        End If
    Else
        MessageBox.Show("The AddJpegImageFromFile() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
    End If
Else
    MessageBox.Show("The NewPDF() method or the NewPage() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
End If
gdpicturePDF.Dispose()

string caption = "Example: AddEllipseToPath";
GdPicturePDF gdpicturePDF = new GdPicturePDF();
if ((gdpicturePDF.NewPDF() == GdPictureStatus.OK) &&
    (gdpicturePDF.NewPage(PdfPageSizes.PdfPageSizeA4) == GdPictureStatus.OK))
{
    string image_name = gdpicturePDF.AddJpegImageFromFile("image.jpg");
    if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
    {
        float width = gdpicturePDF.GetPageWidth();
        if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
        {
            float height = gdpicturePDF.GetPageHeight();
            if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
            {
                //the new height of the destination area
                height = height / 2;
                if ((gdpicturePDF.SelectPage(1) == GdPictureStatus.OK) &&
                    (gdpicturePDF.DrawImage(image_name, 0, height, width, height) == GdPictureStatus.OK) &&
                    (gdpicturePDF.AddEllipseToPath(width / 2, height / 2, width / 2, height / 2) == GdPictureStatus.OK) &&
                    (gdpicturePDF.ClipPath() == GdPictureStatus.OK) &&
                    (gdpicturePDF.DrawImage(image_name, 0, 0, width, height) == GdPictureStatus.OK))
                {
                    GdPictureStatus status = gdpicturePDF.SaveToFile("test_AddEllipseToPath2.pdf");
                    if (status == GdPictureStatus.OK)
                        MessageBox.Show("The example has been followed successfully and the file has been saved.", caption);
                    else
                        MessageBox.Show("The example has been followed successfully, but the file can't be saved. Status: " + status.ToString(), caption);
                }
                else
                    MessageBox.Show("The example has not been followed successfully.\nThe last known status is " + gdpicturePDF.GetStat().ToString(), caption);
            }
            else
                MessageBox.Show("The GetPageHeight() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
        }
        else
            MessageBox.Show("The GetPageWidth() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
    }
    else
        MessageBox.Show("The AddJpegImageFromFile() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
}
else
    MessageBox.Show("The NewPDF() method or the NewPage() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
gdpicturePDF.Dispose();

Reference

GdPicturePDF Class
GdPicturePDF Members
BeginPath Method
ClosePath Method
StrokePath Method
FillPath Method
ClipPath Method
AddGraphicsToPath
SetMeasurementUnit Method
SetOrigin Method