// This example illustrates how to apply an expression and access it.

NewScene( null, false );

var oNull = ActiveSceneRoot.AddNull();

var oAnotherNull = ActiveSceneRoot.AddNull("AnotherNull");

strExpr = oAnotherNull.posy.FullName + " + 2";

var oExpr = oNull.posx.AddExpression(strExpr);

//You can access the parameter to which an expression is connected by using the output port.

Application.LogMessage("Parameter owner of the expression " + oExpr.OutputPorts(0).Target2.FullName);

//You can access the parameter which are used inside an expression by using the input ports of 

//the expression operator.

var oInputPorts = oExpr.InputPorts

for(i = 0; i < oInputPorts.Count; i++)

{

	Application.LogMessage("Parameter client of the expression " + oInputPorts(i).Target2.FullName);

}

// Formula that defines the expression is available as a Parameter value

oDefinitionParam = oExpr.Parameters( "Definition" )

Application.LogMessage( "Expression definition :" + oDefinitionParam.Value) ;

// Expression can be changed

strNewExpr = oAnotherNull .posy.FullName + " - " + oAnotherNull .posx.FullName ;

oDefinitionParam.Value = strNewExpr ;

Application.LogMessage( "New expression definition : " + oDefinitionParam.Value ) ;

// Show the new expression formula in action

oAnotherNull.posy = 10 ;

oAnotherNull.posx = 4 ;

// Value should be 10 - 4 = 6

Application.LogMessage( "With new expression posx is " + oNull.posx.value ) ;

// Remove the expression

oNull.posx.Disconnect() ;

//INFO : Parameter owner of the expression null.kine.local.posx

//INFO : Parameter client of the expression AnotherNull.kine.local.posy

//INFO : Expression definition :AnotherNull.kine.local.posy + 2

//INFO : New expression definition : AnotherNull.kine.local.posy - AnotherNull.kine.local.posx

//INFO : With new expression posx is 6