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	Search   parametricgraph.cpp /*************************************************************************** parametricgraph.cpp - description ------------------- begin : Sun May 26 2002 copyright : (C) 2002 by Fungmeista email : mizunoami44@users.sourceforge.net ***************************************************************************/ /*************************************************************************** * * * This program is free software; you can redistribute it and/or modify * * it under the terms of the GNU General Public License as published by * * the Free Software Foundation; either version 2 of the License, or * * (at your option) any later version. * * * ***************************************************************************/ #include "parametricgraph.h" #include <sstream> #include <qpainter.h> #include "expression.h" #include "fungparser.h" #include "arclengthfunction.h" ParametricGraph::ParametricGraph(QWidget *parent, const char *name) : ExpressionGraph (parent, name) { tMin = -15; tMax = 15; tStep = 0.1; } ParametricGraph::~ParametricGraph() { } void ParametricGraph::load_key( const char *key, const char *value ) { if (strcmp(key,"Function=") == 0) //override loading of a function by ExpressionGraph { char alpha[256]; std::stringstream stream(value); stream.get(alpha,sizeof(alpha),':'); QString sx(alpha); stream.ignore(sizeof(char)); stream.get(alpha,sizeof(alpha),':'); QString sy(alpha); stream.ignore(sizeof(char)); stream>>alpha; QColor color(alpha); stream>>alpha; bool show; if ( strcmp( alpha,"0" ) == 0 ) show = false; else show = true; addExpression(Expression(sx,sy,show,color)); nextExpression(); return; //don't let ExpressionGraph try to load this key } ExpressionGraph::load_key(key,value); if (strcmp(key,"tMin=") == 0) { setTMin(QString(value).toDouble()); } else if (strcmp(key,"tMax=") == 0) { setTMax(QString(value).toDouble()); } else if (strcmp(key,"tStep=") == 0) { setTStep(QString(value).toDouble()); } } void ParametricGraph::installMathFunctions() { BasicGraph::installMathFunctions(); addMathFunction(new ArcLengthFunction(this,2),"Arc Length"); } int ParametricGraph::execMathFunction( const char * id ) { MathFunction *mf = getMathFunction(id); if ( mf ) { switch ( mf->expressionsRequired() ) { case 0: return BasicGraph::execMathFunction(id); break; case 1: //qWarning("Invalid MathFunction: %s",id); break; case 2: { FungParser *fpx = getParsedCurrentExpression(X_VAR); FungParser *fpy = getParsedCurrentExpression(Y_VAR); if (fpx && fpy) { mf->exec(fpx,fpy); return 0; } return -1; } default: break; } } return -1; } void ParametricGraph::sendCustomClick(QMouseEvent *e, MathFunction *m, double, double) { qDebug("custom click: %f",traceDepX(toGraphXCoord(e->x()))); m->sendClick(e,traceDepX(toGraphXCoord(e->x()))); } void ParametricGraph::putUndefinedMessage(double x, double) { emit activeCoordinateChanged( QString("%1 = %2").arg(independent_vars()).arg(traceDepX(x)), QString("%1 = Undefined").arg(dependent_var(X_VAR)), QString("%1 = Undefined").arg(dependent_var(Y_VAR)) ); } void ParametricGraph::updateCoords() { if (isTracing()) { emit activeCoordinateChanged( QString("%1 = %2").arg(independent_vars()).arg(t_trace), QString("%1 = %2").arg(dependent_var(X_VAR)).arg(getMouseX()), QString("%1 = %2").arg(dependent_var(Y_VAR)).arg(getMouseY()) ); } else BasicGraph::updateCoords(); } void ParametricGraph::drawExpression(QPainter* painter, Expression & expression) { for (double t = tMin; t < tMax; t+=tStep) { FungParser *xfp = expression.getParsedExpression(dependent_var(X_VAR)); FungParser *yfp = expression.getParsedExpression(dependent_var(Y_VAR)); double d[] = {t,animatorValue()}; double xevaluated = xfp->Eval(d); double yevaluated = yfp->Eval(d); if (xfp->EvalError() || yfp->EvalError()){continue;} if (isDrawConnected()) { double nexttval = t+tStep; double dnext[] = {nexttval,animatorValue()}; double nextxevaluated = xfp->Eval(dnext); double nextyevaluated = yfp->Eval(dnext); if (xfp->EvalError() || yfp->EvalError()){continue;} painter->drawLine(toPixelXCoord(xevaluated),toPixelYCoord(yevaluated),toPixelXCoord(nextxevaluated),toPixelYCoord(nextyevaluated)); } else painter->drawPoint(toPixelXCoord(xevaluated),toPixelYCoord(yevaluated)); } // painter->drawText(25,35+(2*i)*(metrics.height()+1),QString("x%1=").arg(i+1)+functions->at(i)->xexpression); // painter->drawText(25,35+(2*i+1)*(metrics.height()+1),QString("y%1=").arg(i+1)+functions->at(i)->yexpression); } /* void ParametricGraph::callDrawExpression(Expression &expression, QPainter *painter) { FungParser fpx(getAngle()); FungParser fpy(getAngle()); std::string sx = expression.xexpression(); std::string sy = expression.yexpression(); parseExpression(sx,&fpx,X_VAR); parseExpression(sy,&fpy,Y_VAR); drawExpression(painter,fpx,fpy); } */ int ParametricGraph::setTMin(double _tMin) { if (_tMin < tMax) { tMin = _tMin; repaint(false); return 0; } else return 1; } int ParametricGraph::setTMax(double _tMax) { if (_tMax > tMin) { tMax = _tMax; repaint(false); return 0; } else return 1; } int ParametricGraph::setTStep(double _tStep) { if (_tStep > 0) { tStep = _tStep; repaint(false); return 0; } else return 1; } int ParametricGraph::setXYForTrace(const double mousex, const double, double *x, double *y, Expression &expression) { FungParser *fpx = expression.getParsedExpression(dependent_var(X_VAR)); FungParser *fpy = expression.getParsedExpression(dependent_var(Y_VAR)); double d[] = {mousex,animatorValue()}; *x = fpx->Eval(d); *y = fpy->Eval(d); t_trace = mousex; return (fpx->EvalError() || fpy->EvalError()); }