My gui is taking too much time to plot and during plot time its being freeze…

i made a gui in which i am using multiple loops and i am using vector ……every thing fine but its taking too much time to plot and during plot time gui is being freezed……please help me to come out from this hell…….thanks

i made a gui in which i am using multiple loops and i am using vector ……every thing fine but its taking too much time to plot and during plot time gui is being freezed……please help me to come out from this hell…….thanks

This is my code...


double Nharmonic = 6;
double Shipspeed = 27.6 ;
double BladeThick = 0.2;
double BladeLen = 5;
double KinematicVis = pow(10,-6.0);
double ENoPiston = 4;
double Fbroad = 0;

double Fpeak = 100 + Shipspeed*10 ;
double Rnl1hz = 60 + Shipspeed*2 ;

double ShaftFreq = floor(ui->No_of_Shaft_rpm_lineEdit_7->text().toDouble()/60);
double BladeFreq = ShaftFreq*ui->No_of_Propeller_Blades_lineEdit_8->text().toDouble();
double EngineFreq = ShaftFreq*ui->GearBox_Ratio__lineEdit_7->text().toDouble();

double temp = 0;
double Coefficientsummation = 0;
double amp =0;
double TempRandom = 0.0;


//Data for plot
QVector<double> XShaftSignal(T*fs ,0);
QVector<double> XBladeSignal(T*fs ,0);
QVector<double> XPropeller(T*fs ,0);
QVector<double> XCavitation(T*fs ,0);
QVector<double> XFlow;
QVector<double> XCylinFiring(T*fs ,0);
QVector<double> XCrankshaft(T*fs ,0);
QVector<double> XPistonslap(T*fs ,0);
QVector<double> XEngineValve(T*fs ,0);
QVector<double> XPistonRing(T*fs ,0);
QVector<double> XEngine(T*fs ,0);
QVector<double> XGearBox;
QVector<double> Xtotal(T*fs ,0);
QVector<double> XBroadband(T*fs ,0);

/* XShaftSignal.clear();
XBladeSignal.clear();
XPropeller.clear();
XCavitation.clear();
XFlow.clear();
XCylinFiring.clear();
XCrankshaft.clear();
XPistonslap.clear();
XPistonslap.clear();
XEngineValve.clear();
XPistonRing.clear();
XEngine.clear();
XGearBox.clear();
Xtotal.clear();
XBroadband.clear();
t.clear();
f.clear();
Xfinal.clear();
FFT_Y.clear();
FFT_Y2.clear();
Xfinal1.clear();*/

for(int j = 0; j < T*fs; j = j + 1)
{
t.append(j/fs);
f.append((j*fs)/(fs*T));


}


for (int i = 0 ; i < Nharmonic; i++)
{
temp = Rnl1hz + 8 - 2*(i+1) ;

for (int j = 0; j < t.count(); j++)
{
XShaftSignal.replace(j, XShaftSignal.at(j) + pow(10,(temp/20))*cos(2*pi*t.at(j)*ui->No_of_Propellers_lineEdit_6->text().toDouble()*ShaftFreq*(i+1)));


}

Coefficientsummation = Coefficientsummation + pow(10,(temp/20)) ;

}





for (int i = 0; i < Nharmonic; i++)
{
temp = Rnl1hz + 17 - 2*(i+1) ;
for (int j = 0; j < t.count(); j++)
{
XBladeSignal.replace(j,XBladeSignal.at(j) + pow(10,(temp/20))*cos(2*pi*t.at(j)*ui->No_of_Propellers_lineEdit_6->text().toDouble()*BladeFreq*(i+1)));
}
Coefficientsummation = Coefficientsummation + pow(10,(temp/20)) ;

}


for (int j = 0; j < t.count(); j++)
{
XPropeller.replace(j,XShaftSignal.at(j) + XBladeSignal.at(j));

}

//////////// Cavitation Noise ///////////////////////


double Flow_Vel = 4*Shipspeed*0.5144;
double RenolNo = Flow_Vel*BladeLen/KinematicVis ;

double CorrectedThick = BladeThick + 0.0297 * BladeLen/pow(RenolNo,(0.2));
double Tipspeed = (2*pi*BladeLen*ui->No_of_Shaft_rpm_lineEdit_7->text().toDouble())/60;
double Ls = 175 + 60*log10(Tipspeed/25) + log10(ui->No_of_Propeller_Blades_lineEdit_8->text().toDouble()/4);


if (ui->checkBox_Cavitation->isChecked())
{
for (int i = 99 ; i < 8000; i++)
{
temp = Ls + 20*(1 - log10(i+1));


for (int j = 0; j < t.count(); j++)
{
XCavitation.replace(j,XCavitation.at(j) + pow(10,(temp/40))*cos(2*pi*t.at(j)*(i+1)));
}
Coefficientsummation = Coefficientsummation + pow(10,(temp*0.025)) ;


}


}


/////////////// Flow Induced Noise ///////////////////////////

if (ui->checkBox_Flow->isChecked())
{
double Fv = 0.18*Flow_Vel/CorrectedThick ;
if(Shipspeed > 10)
{
temp = 1.5 * (Shipspeed - 10);
for (int j = 0; j < t.count(); j++)
{
XFlow.append(pow(10,(temp/20))*cos(2*pi*t.at(j)*Fv));
}
Coefficientsummation = Coefficientsummation + pow(10,(temp*0.05)) ;
}
else
{
XFlow.append(0);
}


}


else
{
for (int j = 0; j < t.count(); j++)
{
XFlow.append(0);
}

}



for (int i = 0; i< Nharmonic;i++)
{

amp = pow(10,((Rnl1hz + 13.5 - 1.5*(i+1))/20));

for (int j = 0; j < t.count(); j++)
{
XCylinFiring.replace(j, XCylinFiring.at(j) + (amp/3)*cos(2*pi*t.at(j)*(i+1)*EngineFreq*(ENoPiston/2)));
XCrankshaft.replace(j, XCrankshaft.at(j) + (amp/4)*cos(2*pi*t.at(j)*(i+1)*EngineFreq));
XPistonslap.replace(j, XPistonslap.at(j) + amp*cos(2*pi*t.at(j)*(i+1)*EngineFreq*ENoPiston));
XEngineValve.replace(j, XEngineValve.at(j) + (amp/2)*cos(2*pi*t.at(j)*(i+1)*EngineFreq*ENoPiston*ui->No_of_Values_per_Piston_lineEdit->text().toDouble()));
XPistonRing.replace(j,XPistonRing.at(j) + (amp/5)*cos(2*pi*t.at(j)*(i+1)*EngineFreq*ENoPiston*ui->No_of_Rings_per_Piston_lineEdit_5->text().toDouble()));

}
Coefficientsummation = Coefficientsummation + (amp/3);

}

for (int i = 0; i< Nharmonic;i++)
{
amp = pow(10,((Rnl1hz + 13.5 - 1.5*(i+1))/20));

Coefficientsummation = Coefficientsummation + (amp/4);
}


for (int i = 0; i< Nharmonic;i++)
{
amp = pow(10,((Rnl1hz + 13.5 - 1.5*(i+1))/20));

Coefficientsummation = Coefficientsummation + (amp);
}


for (int i = 0; i< Nharmonic;i++)
{
amp = pow(10,((Rnl1hz + 13.5 - 1.5*(i+1))/20));

Coefficientsummation = Coefficientsummation + (amp/2);
}


for (int i = 0; i< Nharmonic;i++)
{
amp = pow(10,((Rnl1hz + 13.5 - 1.5*(i+1))/20));

Coefficientsummation = Coefficientsummation + (amp/5);
}

// if (ui->checkBox_Random->isChecked())
// {
for (int j = 0; j < t.count(); j++)
{
XEngine.replace(j, XCylinFiring.at(j) + XCrankshaft.at(j) + XPistonslap.at(j) + XEngineValve.at(j) + XPistonRing.at(j));
XGearBox.append( pow(10,6.0)*pow(10,0.15)*cos(2*pi*t.at(j)*ui->No_of_Gears_lineEdit_8->text().toDouble()*EngineFreq));

// float r = (float)rand() / (float)RAND_MAX;
// TempRandom = r * (5.0) * pow(10,7.0);


Xtotal.replace(j,XPropeller.at(j) + XCavitation.at(j) + XFlow.at(j)+ XEngine.at(j) + XGearBox.at(j) ) ;
}

// }



/* else
{

for (int j = 0; j < t.count(); j++)
{
XEngine.replace(j, XCylinFiring.at(j) + XCrankshaft.at(j) + XPistonslap.at(j) + XEngineValve.at(j) + XPistonRing.at(j));
XGearBox.append( pow(10,6.0)*pow(10,0.15)*cos(2*pi*t.at(j)*ui->No_of_Gears_lineEdit_8->text().toDouble()*EngineFreq));
Xtotal.replace(j,XPropeller.at(j) + XCavitation.at(j) + XFlow.at(j)+ XEngine.at(j) + XGearBox.at(j)) ;
}


}*/



Coefficientsummation = Coefficientsummation + pow(10,6.15);
Fbroad = fs/2;
if (ui->checkBox_BroadBand->isChecked())
{
for (double i = 0 ; i < Fpeak; i = i+1/T)
{
temp = pow(10,(Rnl1hz/20));
for (int j = 0; j < t.count(); j++)
{
XBroadband.replace(j,XBroadband.at(j) + temp*cos(2*pi*t.at(j)*(i+1))) ;
}
}

for (double i = Fpeak ; i < Fbroad; i=i+1/T)
{
double exp_broad = exp((i+1)*0.0002);
double Fpeak_exp = exp(Fpeak*0.0002);
temp = pow(10,((Rnl1hz - (exp_broad*exp_broad) + (Fpeak_exp*Fpeak_exp))/20));

for (int j = 0; j < t.count(); j++)
{
XBroadband.replace(j, XBroadband.at(j) + temp*cos(2*pi*t.at(j)*(i+1))) ;
}
}

for (int j = 0; j< t.count(); j++)
{

Xfinal.replace(j, (Xtotal.at(j) - 5.0*Coefficientsummation)* XBroadband.at(j));
}
}
else
{
for (int j = 0; j< t.count(); j++)
{
Xfinal.replace(j, (Xtotal.at(j)));
}
}

You have two options:

- split the painting into smaller chunks and return to event processing in betwee
- use a thread to paint into a QImage and display that image

Cheers,
_