GrapherExpr.h

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/*
* Copyright Disney Enterprises, Inc.  All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License
* and the following modification to it: Section 6 Trademarks.
* deleted and replaced with:
*
* 6. Trademarks. This License does not grant permission to use the
* trade names, trademarks, service marks, or product names of the
* Licensor and its affiliates, except as required for reproducing
* the content of the NOTICE file.
*
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*/
#ifndef _GrapherExpr_
#define _GrapherExpr_
#include <SeExpression.h>

struct SimpleVar:public SeExprScalarVarRef
{
    double val; // independent variable
        void eval(const SeExprVarNode* /*node*/,SeVec3d& result)
    {result[0]=val;}
};


class GrapherExpr:public SeExpression
{
    const std::map<std::string,SimpleVar>& vars;
public:
    GrapherExpr(const std::string& expr,const std::map<std::string,SimpleVar>& vars)
        :SeExpression(expr),vars(vars)
    {}

    void setX(double x_input)
    {x.val=x_input;}

private:
    mutable SimpleVar x;

    SeExprVarRef* resolveVar(const std::string& name) const
    {
        // check my internal variable
        if(name == "x") return &x;
        // check external variable table
        std::map<std::string,SimpleVar>::const_iterator i=vars.find(name);
        if(i!=vars.end()) return const_cast<SimpleVar*>(&i->second);
        // nothing found
        return 0;
    }
};
#endif