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Visual Basic 6 definition

Declare Function ArcTo Lib "gdi32.dll" (ByVal hdc As Long, ByVal nLeftRect As Long, ByVal nTopRect As Long, ByVal nRightRect As Long, ByVal nBottomRect As Long, ByVal nXRadial1 As Long, ByVal nYRadial1 As Long, ByVal nXRadial2 As Long, ByVal nYRadial2 As Long) As Long

Visual Basic .NET definition

Declare Function ArcTo Lib "gdi32" (ByVal hDC As Integer, ByVal X1 As Integer, ByVal Y1 As Integer, ByVal X2 As Integer, ByVal Y2 As Integer, ByVal X3 As Integer, ByVal Y3 As Integer, ByVal X4 As Integer, ByVal Y4 As Integer) As Integer

C# definition

[DllImport("gdi32")] public static extern int ArcTo(int hDC, int X1, int Y1, int X2, int Y2, int X3, int Y3, int X4, int Y4)

Description

ArcTo draws an elliptical arc on a device using the device's current pen. After drawing the arc, the device's current point is set to the end point of the arc. The ellipse which the arc lies on is inscribed within the bounding rectangle coordinates passed to the function. The start and end points are determined by two radials. The radials begin at the center of the ellipse and extend through the given radial point (either the start or end one); where they intersect the ellipse is where the start and end points of the arc are. The direction the arc is drawn in depends on the device's current setting. ArcTo Draws an elliptical arc. System.Drawing.Graphics.DrawArc

Return Value

If an error occured while attempting to draw the arc, the function returns 0 (call GetLastError to get the error code). If the function completed successfully, it returns a non-zero value.

Parameters

hdc A handle to a device context of the device to draw the arc on. nLeftRect The x coordinate of the upper-left point of the ellipse's bounding rectangle. nTopRect The y coordinate of the upper-left point of the ellipse's bounding rectangle. nRightRect The x coordinate of the lower-right point of the ellipse's bounding rectangle. nBottomRect The y coordinate of the lower-right point of the ellipse's bounding rectangle. nXRadial1 The x coordinate of the radial point that determines the arc's starting point. nYRadial1 The y coordinate of the radial point that determines the arc's starting point. nXRadial2 The x coordinate of the radial point that determines the arc's ending point. nYRadial2 The y coordinate of the radial point that determines the arc's ending point.

Further Information:

For further information on Windows API functions such as these, and how to use these API's in your C# and VB.NET applications, please refer to the book 'Network programming in .NET' (Buy at Amazon UK) (Buy at Amazon US)

Visual Basic 6 example source code

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