# Silver Ratio Calculator using PyQt5

In this article we will see how we can create a silver ratio calculator using PyQt5. In mathematics, two quantities are in the silver ratio if the ratio of the sum of the smaller and twice the larger of those quantities, to the larger quantity, is the same as the ratio of the larger one to the smaller one. Below is how the silver ratio calculator will look like PyQt5 is cross-platform GUI toolkit, a set of python bindings for Qt v5. One can develop an interactive desktop application with so much ease because of the tools and simplicity provided by this library. Below is the command to install the PyQt5

`pip install PyQt5`

Concept :
Below is the formula for calculating silver ratio

```A/B = 1 + ?2
```

Here A is the larger length and B is the shorter i.e second part of the length, both A and B should be greater than zero

GUI Implementation Steps :
1. Create a heading label that display the calculator name
2. Create two radio buttons for selecting between first and second length
3. Create two spin boxes for user to enter the specific length
4. Create push button for calculating the other values according tot golden ratio
5. Create a label to show the calculated values

Back-End Implementation :
1. Initially make all the spin boxes disable
3. Inside the radio button method check which radio button is checked
4. According to the checked radio button make the corresponding spin box enable and make the other the spin box disable
5. Also assign the flag vales according to the selected radio button
6. Add same action to both spin boxes
7. Inside the spin box action check which spin box is enabled and make other spin box value zero
8. Add action to the push button
9. Inside the push button action check the flag according to the flag with the help of silver ratio formula calculate the other length
10. Format the calculated length and show the length with the help of result label

Below is the implementation

 `# importing libraries ` `from` `PyQt5.QtWidgets ``import` `*`  `from` `PyQt5 ``import` `QtCore, QtGui ` `from` `PyQt5.QtGui ``import` `*`  `from` `PyQt5.QtCore ``import` `*`  `import` `sys ` ` `  ` `  `class` `Window(QMainWindow): ` ` `  `    ``def` `__init__(``self``): ` `        ``super``().__init__() ` ` `  `        ``# setting title ` `        ``self``.setWindowTitle(``"Python "``) ` ` `  `        ``# width of window ` `        ``self``.w_width ``=` `400` ` `  `        ``# height of window ` `        ``self``.w_height ``=` `430` ` `  `        ``# setting geometry ` `        ``self``.setGeometry(``100``, ``100``, ``self``.w_width, ``self``.w_height) ` ` `  `        ``# calling method ` `        ``self``.UiComponents() ` ` `  `        ``# showing all the widgets ` `        ``self``.show() ` ` `  `    ``# method for components ` `    ``def` `UiComponents(``self``): ` ` `  `        ``# creating head label ` `        ``head ``=` `QLabel(``"Silver Ratio Calculator"``, ``self``) ` ` `  `        ``head.setWordWrap(``True``) ` ` `  `        ``# setting geometry to the head ` `        ``head.setGeometry(``0``, ``10``, ``400``, ``60``) ` ` `  `        ``# font ` `        ``font ``=` `QFont(``'Times'``, ``15``) ` `        ``font.setBold(``True``) ` `        ``font.setItalic(``True``) ` `        ``font.setUnderline(``True``) ` ` `  `        ``# setting font to the head ` `        ``head.setFont(font) ` ` `  `        ``# setting alignment of the head ` `        ``head.setAlignment(Qt.AlignCenter) ` ` `  `        ``# setting color effect to the head ` `        ``color ``=` `QGraphicsColorizeEffect(``self``) ` `        ``color.setColor(Qt.darkCyan) ` `        ``head.setGraphicsEffect(color) ` ` `  ` `  `        ``# creating a radio button ` `        ``self``.length1 ``=` `QRadioButton(``"First Length (A)"``, ``self``) ` ` `  `        ``# setting geometry ` `        ``self``.length1.setGeometry(``50``, ``90``, ``140``, ``40``) ` ` `  `        ``# setting font ` `        ``self``.length1.setFont(QFont(``'Times'``, ``9``)) ` ` `  `        ``# creating a spin box ` `        ``self``.l1 ``=` `QSpinBox(``self``) ` `        ``self``.l1.setMaximum(``999999``) ` ` `  `        ``# setting geometry to the spin box ` `        ``self``.l1.setGeometry(``200``, ``90``, ``160``, ``40``) ` ` `  `        ``# setting font ` `        ``self``.l1.setFont(QFont(``'Times'``, ``9``)) ` ` `  `        ``# setting alignment ` `        ``self``.l1.setAlignment(Qt.AlignCenter) ` ` `  `        ``# creating a radio button ` `        ``self``.length2 ``=` `QRadioButton(``"Second Length (B)"``, ``self``) ` ` `  `        ``# setting geometry ` `        ``self``.length2.setGeometry(``50``, ``150``, ``145``, ``40``) ` ` `  `        ``# setting font ` `        ``self``.length2.setFont(QFont(``'Times'``, ``9``)) ` ` `  `        ``# creating a spin box ` `        ``self``.l2 ``=` `QSpinBox(``self``) ` `        ``self``.l2.setMaximum(``999999``) ` ` `  `        ``# setting geometry to the spin box ` `        ``self``.l2.setGeometry(``200``, ``150``, ``160``, ``40``) ` ` `  `        ``# setting font ` `        ``self``.l2.setFont(QFont(``'Times'``, ``9``)) ` ` `  `        ``# setting alignment ` `        ``self``.l2.setAlignment(Qt.AlignCenter) ` ` `  ` `  `        ``# adding same action to all the radio button ` `        ``self``.length1.clicked.connect(``self``.radio_method) ` `        ``self``.length2.clicked.connect(``self``.radio_method) ` ` `  `        ``# adding same action to all the spin box ` `        ``self``.l1.valueChanged.connect(``self``.spin_method) ` `        ``self``.l2.valueChanged.connect(``self``.spin_method) ` ` `  `        ``# making all the spin box disabled ` `        ``self``.l1.setDisabled(``True``) ` `        ``self``.l2.setDisabled(``True``) ` ` `  ` `  ` `  `        ``# creating a push button ` `        ``calculate ``=` `QPushButton(``"Calculate"``, ``self``) ` ` `  `        ``# setting geometry to the push button ` `        ``calculate.setGeometry(``100``, ``270``, ``200``, ``40``) ` ` `  `        ``# adding action to the button ` `        ``calculate.clicked.connect(``self``.calculate) ` ` `  `        ``# adding color effect to the push button ` `        ``color ``=` `QGraphicsColorizeEffect() ` `        ``color.setColor(Qt.blue) ` `        ``calculate.setGraphicsEffect(color) ` ` `  ` `  `        ``# creating a label to show result ` `        ``self``.result ``=` `QLabel(``self``) ` ` `  `        ``# setting properties to result label ` `        ``self``.result.setAlignment(Qt.AlignCenter) ` ` `  `        ``# setting geometry ` `        ``self``.result.setGeometry(``50``, ``330``, ``300``, ``70``) ` ` `  `        ``# making it multi line ` `        ``self``.result.setWordWrap(``True``) ` ` `  `        ``# setting stylesheet ` `        ``# adding border and background ` `        ``self``.result.setStyleSheet(``"QLabel"` `                                  ``"{"` `                                  ``"border : 3px solid black;"` `                                  ``"background : white;"` `                                  ``"}"``) ` ` `  `        ``# setting font ` `        ``self``.result.setFont(QFont(``'Arial'``, ``11``)) ` ` `  ` `  `    ``# method called by the radio buttons ` `    ``def` `radio_method(``self``): ` ` `  `        ``# checking who is checked and who is unchecked ` `        ``# if first radio button is checked ` `        ``if` `self``.length1.isChecked(): ` ` `  `            ``# making first spin box enable ` `            ``self``.l1.setEnabled(``True``) ` ` `  `            ``# making rest two spin box disable ` `            ``self``.l2.setDisabled(``True``) ` ` `  ` `  `            ``# assigning flags ` `            ``self``.check1 ``=` `True` `            ``self``.check2 ``=` `False` ` `  `        ``elif` `self``.length2.isChecked(): ` ` `  `            ``# making second spin box enable ` `            ``self``.l2.setEnabled(``True``) ` ` `  `            ``# making rest two spin box disable ` `            ``self``.l1.setDisabled(``True``) ` ` `  ` `  `            ``# assigning flags ` `            ``self``.check1 ``=` `False` `            ``self``.check2 ``=` `True` ` `  ` `  `    ``def` `spin_method(``self``): ` ` `  `        ``# finding who called the method ` `        ``if` `self``.l1.isEnabled(): ` ` `  `            ``# setting current values ` `            ``self``.l2.setValue(``0``) ` ` `  ` `  `        ``elif` `self``.l2.isEnabled(): ` ` `  `            ``# setting current values ` `            ``self``.l1.setValue(``0``) ` ` `  ` `  `    ``def` `calculate(``self``): ` `    `  `        ``# silver ratio value ` `        ``silver ``=` `2.414` ` `  ` `  `        ``# if first value is selected ` `        ``if` `self``.check1 ``=``=` `True``: ` ` `  `            ``# getting spin box value ` `            ``A ``=` `self``.l1.value() ` ` `  `            ``# calculating smaller length ` `            ``B ``=` `A ``/` `silver ` ` `  `        ``elif` `self``.check2 ``=``=` `True``: ` ` `  `            ``# getting spin box value ` `            ``B ``=` `self``.l2.value() ` ` `  `            ``# calculating larger length ` `            ``A ``=` `B ``*` `silver ` ` `  ` `  `        ``# formatting values upto two decimal ` `        ``A ``=` `"{:.2f}"``.``format``(A) ` `        ``B ``=` `"{:.2f}"``.``format``(B) ` ` `  `        ``# setting text to the label ` `        ``self``.result.setText(``"A = "` `+` `str``(A) ``+` `", B = "` `+` `str``(B)) ` ` `  ` `  ` `  ` `  ` `  `# create pyqt5 app ` `App ``=` `QApplication(sys.argv) ` ` `  `# create the instance of our Window ` `window ``=` `Window() ` ` `  `# start the app ` `sys.exit(App.``exec``()) `

Output :

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