/disk1/scratch/aselle/projects/seexpr/SeExpr/src/demos/segraph/Graph.h

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/*
* (c) Disney Enterprises, Inc.  All rights reserved.
*
* This file is licensed under the terms of the Microsoft Public License (MS-PL)
* as defined at: http://opensource.org/licenses/MS-PL.
*
* A complete copy of this license is included in this distribution as the file
* LICENSE.
*/
#ifndef _Graph_h_
#define _Graph_h_

#include <QtGui/QKeyEvent>
#include <QtGui/QPainter>
#include <QtGui/QWidget>
#include <QtGui/QStatusBar>
#include <iostream>
#include <vector>
#include "GrapherExpr.h"

static const int divs=1;

class Graph:public QWidget
{
    Q_OBJECT;
public:
    enum OperationCode{NONE=0,FIND_MIN,FIND_MAX,FIND_ROOT};
private:

    std::vector<GrapherExpr*>& exprs;
    float logBase;

    OperationCode operationCode;
    int functionIndex;
    double boundStart;
    double boundEnd;
    double rootX,rootY;
    bool rootShow;
    bool minShow;
    int lastcx,lastcy;
    bool dragging;
    bool scaling;
    QStatusBar* status;

public:
    Graph(QStatusBar* status,std::vector<GrapherExpr*>& exprs);
protected:
    float xmin,xmax,ymin,ymax;
    float fit(float t,float src0,float src1,float dest0,float dest1);
    void drawX(QPainter& painter,int power,bool label=false);
    void drawY(QPainter& painter,int power,bool label=false);
    void paintEvent(QPaintEvent * /*event*/);
    void plotNew(QPainter& painter,int funcId);

    void mousePressEvent(QMouseEvent* event);
    void mouseMoveEvent(QMouseEvent* event);
    void mouseReleaseEvent(QMouseEvent* event);

    void xform(float x,float y,float& cx,float& cy);
    void xforminv(float cx,float cy,float& x,float& y);
public:
    void scheduleRoot(const OperationCode operationCode_in,const int functionIndex_in);
private:
    void solveRoot(const int function,double xInitial);
    double golden(const int function,double xmin,double xcenter,double xmax,bool solveMax=false,double tolerance=1e-5);
    void solveMin(const int function,double xmin,double xmax,bool solveMax=false);
    void solveMax(const int function,double xmin,double xmax);
public slots:
    void redraw();
};


#endif

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