FixedPoint Structure

Represents a 16.16 fixed-point number.

Namespace: Microsoft.WindowsMobile.DirectX.Direct3D
Assembly: Microsoft.WindowsMobile.DirectX (in microsoft.windowsmobile.directx.dll)

Syntax

'Declaration
Public Structure FixedPoint
    Implements IComparable, IFormattable, IConvertible
'Usage
Dim instance As FixedPoint

public struct FixedPoint : IComparable, IFormattable, IConvertible

public value class FixedPoint : IComparable, IFormattable, IConvertible

public final class FixedPoint extends ValueType implements IComparable, IFormattable, 
    IConvertible

Not applicable.

Remarks

This structure is used to interoperate with the various types in Windows Mobile Direct 3D that have fixed-point interfaces. The internal representation of this class is an Int32 structure.

Example

The following example shows how you can use a FixedPoint structure.

' The following code is from the
' Direct3D Mobile Fixed Point Billboard Sample.
' It uses FixedPoint to position meshes of trees randomly.
' Initialize the tree data
Dim i As Integer
For i = 0 To numberTrees - 1
    Dim t As New Tree()
    ' Position the trees randomly
    Do
        Dim fTheta As Single = 2.0F * _
            System.Convert.ToSingle(Math.PI) * _
            System.Convert.ToSingle(rand.NextDouble())
        Dim fRadius As Single = 25.0F + 55.0F * _
            System.Convert.ToSingle(rand.NextDouble())
        Dim position As Vector3Fixed
        position.X = CType(fRadius * _
            System.Convert.ToSingle( _
            Math.Sin(fTheta)), FixedPoint)
        position.Z = CType(fRadius * _
            System.Convert.ToSingle(Math.Cos(fTheta)), FixedPoint)
        position.Y = CType(HeightField( _
            System.Convert.ToSingle(position.X), _
            System.Convert.ToSingle(position.Z)), FixedPoint)
        t.Position = position
    Loop While Not IsTreePositionValid(t.Position)

// The following code is from the
// Direct3D Mobile Fixed Point Billboard Sample.
// It uses FixedPoint to position meshes of trees randomly.

        // Initialize the tree data
        for (int i=0; i<numberTrees; i++)
        {
            Tree t = new Tree();


do
{
    float fTheta  = 2.0f * (float)Math.PI *
        (float)rand.NextDouble();
    float fRadius = 25.0f + 55.0f * (float)rand.NextDouble();
    Vector3Fixed position;
    position.X  =
        (FixedPoint)(fRadius * (float)Math.Sin(fTheta));
    position.Z  =
        (FixedPoint)(fRadius * (float)Math.Cos(fTheta));
    position.Y  =
        (FixedPoint)HeightField((float)position.X,
        (float)position.Z);
    t.Position = position;
}
while (!IsTreePositionValid(t.Position));

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows CE, Windows Mobile for Pocket PC, Windows Mobile for Smartphone

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

Version Information

.NET Compact Framework

Supported in: 2.0

See Also

Reference

FixedPoint Members
Microsoft.WindowsMobile.DirectX.Direct3D Namespace

Other Resources

Direct3D Programming