1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/***************************************************************************
hydrometertool.h
-------------------
A hydrometer correction utility for QBrew
-------------------
Copyright 2004-2008, David Johnson <david@usermode.org>
Based on code Copyright 2001, Abe Kabakoff <abe_kabakoff@gmx.de>
Please see the header file for copyright and license information
***************************************************************************/
#include <QLabel>
#include "resource.h"
#include "data.h"
#include "hydrometertool.h"
using Resource::TITLE;
//////////////////////////////////////////////////////////////////////////////
// HydrometerTool()
// ----------------
// Constructor
HydrometerTool:: HydrometerTool(QWidget* parent)
: QDialog(parent)
{
ui.setupUi(this);
QString SUFFIX = QString(" %1%2")
.arg(Resource::DEGREE)
.arg(Data::instance()->defaultTempUnit().symbol());
setWindowTitle(TITLE + tr(" - Hydrometer Tool"));
// additional setup
QFont fnt(font());
fnt.setBold(true);
ui.corrected->setFont(fnt);
ui.calibrated->setSuffix(SUFFIX);
ui.sample->setSuffix(SUFFIX);
// convert UI properties of celsius
if (Data::instance()->defaultTempUnit() == Temperature::celsius) {
ui.calibrated->setMinimum(0.0);
ui.calibrated->setMaximum(100.0);
ui.calibrated->setValue(15.0);
ui.sample->setMinimum(0.0);
ui.sample->setMaximum(100.0);
ui.sample->setValue(15.0);
}
// connections
connect(ui.sample, SIGNAL(valueChanged(double)), this, SLOT(recalc()));
connect(ui.calibrated, SIGNAL(valueChanged(double)), this, SLOT(recalc()));
connect(ui.reading, SIGNAL(valueChanged(double)), this, SLOT(recalc()));
recalc();
}
//////////////////////////////////////////////////////////////////////////////
// recalc()
// --------
// the signal to calculate the actual SG
void HydrometerTool::recalc()
{
// see http://www.hbd.org/brewery/library/HydromCorr0992.html
const double COEFF1 = 1.313454;
const double COEFF2 = 0.132674;
const double COEFF3 = 2.057793E-3;
const double COEFF4 = 2.627634E-6;
double calterm; // E is the correction factor for the calibration temp
double corr; // the corrected reading
double samp = ui.sample->value();
double cal = ui.calibrated->value();
double read = ui.reading->value();
// calc needs to be in fahrenheit
if (Data::instance()->defaultTempUnit() == Temperature::celsius) {
samp = celsius2fahrenheit(samp);
cal = celsius2fahrenheit(cal);
}
// Correction(@59F) = 1.313454 - 0.132674*T + 2.057793e-3*T**2 - 2.627634e-6*T**3
// the equation is set up for 59F (15C)
calterm = (COEFF1
- (COEFF2 * cal)
+ (COEFF3 * (cal*cal))
- (COEFF4 * (cal*cal*cal)));
corr = (COEFF1
- (COEFF2 * samp)
+ (COEFF3 * (samp*samp))
- (COEFF4 * (samp*samp*samp))) - calterm;
corr /= 1000.0;
corr = 1.0 - corr;
corr = read / corr;
// now that we have the value change the reading
ui.corrected->setText(QString::number(corr, 'f', 3));
}
|
