MoveTo Method

In This Topic

Allow the entity to be moved/rotated on the GPU using OpenGL calls during animation.

Syntax

Visual Basic
C#

'Declaration
 
Public Overridable Sub MoveTo( _
   ByVal data As DrawParams _
)

public virtual void MoveTo( 
   DrawParams data
)

Parameters

data

Remarks

There is no need to encapsulate the transformations into the gl.PushMatrix() / gl.PopMatrix() calls

It is always recommended to call base class implementation from overriders.

It's important when applying an on-the-fly transformation in this method to override the BlockReference.IsInFrustum()and call the base method with the "center" parameter transformed in the same way, in order to avoid undesired clipping.

Example

The following code demonstrates how to animate a subclassed BlockReference entity.

class Oscillating : BlockReference
{
 
double alpha;
 double beta;
 double xPos;
 
public Oscillating(string blockName)
 : base(0, 0, 0, blockName, 1, 1, 1, 0)
 {
 }
 
protected override void Animate(int frameNumber)
 {
 
alpha += 1;
 
if (alpha &gt; 359)
 
alpha = 0;
 
// cranckshaft radius
 double r = 50;
 // connecting rod length
 double l = 120;
 
beta = Math.Asin(r * Math.Sin(Utility.DegToRad(alpha)) / l);
 
xPos = r * Math.Cos(Utility.DegToRad(alpha)) - l * Math.Cos(beta);
 
}
 
public override void MoveTo()
 {
 
base.MoveTo();
 
gl.Translated(xPos, 0, 0); 
gl.Rotated(Utility.RadToDeg(beta), 0, 1, 0);
 
}
 
}

Visual Basic

Class Oscillating
 Inherits BlockReference
 
Private alpha As Double
 Private beta As Double
 Private xPos As Double
 
Public Sub New(ByVal blockName As String)
 MyBase.New(0, 0, 0, blockName, 1, 1, _ 
1, 0)
 End Sub
 
Protected Overloads Overrides Sub Animate(ByVal frameNumber As Integer)
 
alpha += 1
 
If alpha &gt; 359 Then
 
alpha = 0
 
End If
 
' cranckshaft radius
 Dim r As Double = 50
 ' connecting rod length
 Dim l As Double = 120
 
beta = Math.Asin(r * Math.Sin(Utility.DegToRad(alpha)) / l)
 
xPos = r * Math.Cos(Utility.DegToRad(alpha)) - l * Math.Cos(beta)
 
End Sub
 
Public Overloads Overrides Sub MoveTo()
 
MyBase.MoveTo()
 
gl.Translated(xPos, 0, 0)
 
gl.Rotated(Utility.RadToDeg(beta), 0, 1, 0)
 
End Sub
 
End Class

Reference

BlockReference Class
BlockReference Members
StartAnimation Method (devDept.Eyeshot.Viewport)
StopAnimation Method (devDept.Eyeshot.Viewport)
IsInFrustum(FrustumParams,Point3D,Double) Method

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