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
JScript supports the use of structures, but not the declaration of new ones.
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.
Examples
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(randObj.NextDouble())
Dim fRadius As Single = 25.0F + 55.0F * _
System.Convert.ToSingle(randObj.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)randObj.NextDouble();
float fRadius = 25.0f + 55.0f * (float)randObj.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 Smartphone, Windows Mobile for Pocket PC
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Version Information
.NET Compact Framework
Supported in: 3.5, 2.0
See Also
Reference
Microsoft.WindowsMobile.DirectX.Direct3D Namespace