CODEWITHSUNDEEP
qt
user12800116
user12800116

Reputation:

Qt progress bar - display double value

I have to show the instantaneous value of a sensor output using a QProgressbar.

value can change from 0 to 0.3

how do I configure (set range and set value) the QProgressBar to display the above value.

I'm a bit confused because setRange method can only take int values, and how do I set range as 0 and 0.3?

Upvotes: 1

Views: 886

Answers (2)

ZacDu
ZacDu

Reputation: 1

If your progress bar has range 0 to 4500.0, first set the range.

ui->progressBar->setRange(0.0, 4500.0);

And then, use the followings during progressing:

 double percent = 100.0f*currentValue/maximumValue.toFloat();
 QString format = tr("%1 %").arg(QString::number(percent, 'f', 1)); // 1 decimal point
 ui->progressBar->setFormat(format);
 ui->progressBar->setValue(currentValue);

Upvotes: 0

thibsc
thibsc

Reputation: 4049

There are different way. You can chose between these two options:
Transform your range in an integer range by multiplying by 100

[0 , 0.3] -> [0 , 300]
When you receive a new value, just multiply it by 100 0.12*100 = 120/300

You can also make setRange(0, 100) and for each value, make the conversion:

(value * maxValue) / 100
So (0.12 / 0.3) * 100 give you 40%

Upvotes: 1

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