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function_plotter_GUI.py
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function_plotter_GUI.py
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from PyQt5.QtCore import QCoreApplication, QSize, Qt, QMetaObject
from PyQt5.QtWidgets import *
import sys
import matplotlib.pyplot as plt
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
import numpy as np
class DisplayFunctionPlot(FigureCanvas):
""""
Display Function Plot figure object
:cvar
"""
def __init__(self):
# create figure , axes
self.fig = plt.figure()
self.ax = self.fig.add_subplot()
super().__init__(self.fig)
# set styles to the figure
self.set_style()
def set_style(self):
"""
set style to the figure, axes
:cvar
"""
# Configure the grid lines displayed on the map with the labels on x amd y.
plt.grid(True, color='w', linestyle="dotted", alpha=0.3, linewidth=1)
# set color of labels on x,y , figure , axes
self.ax.set_facecolor('#303030')
self.fig.patch.set_facecolor('#303030')
self.ax.xaxis.label.set_color('#bfbfbf')
self.ax.yaxis.label.set_color('#bfbfbf')
# set spines' color
self.ax.spines['bottom'].set_color('#bfbfbf')
self.ax.spines['top'].set_color('#bfbfbf')
self.ax.spines['right'].set_color('#bfbfbf')
self.ax.spines['left'].set_color('#bfbfbf')
# set spins opacity
self.ax.spines['bottom'].set_alpha(0.2)
self.ax.spines['top'].set_alpha(0.2)
self.ax.spines['right'].set_alpha(0.2)
self.ax.spines['left'].set_alpha(0.2)
# set ticks color
plt.yticks(color='#F0F0F0')
plt.xticks(color='#F0F0F0')
# tight figure to the display size
plt.tight_layout()
def validate_input(input_object, massage=None):
"""
flag error (change color of input field in case of wrong data or empty fields )
:parameter: input_object the input field changed
"""
# change StyleSheet to error style (red color)
input_object.setStyleSheet("""
QLineEdit{
border:1px solid #b01e0b;
background-color: rgba(176, 30, 11, 0.1);
font-family: Segoe ui;
font-style: normal;
font-weight: normal;
font-size: 15px;
line-height: 14px;
border-radius:10px;
color: rgb(191, 191, 191);
}
QLineEdit:hover{
background-color: rgb(68, 68, 68);
""")
input_object.clear()
# change PlaceholderText to the error message
if massage:
input_object.setPlaceholderText(massage)
else:
input_object.setPlaceholderText("Required Field")
def refactor_style(input_object):
"""
return input fields to there original case
:parameter: input_object the input field changed
"""
# return input to original style
input_object.setStyleSheet("""
QLineEdit{
border:none;
background-color: rgb(63, 63, 63);
font-style: normal;
font-weight: normal;
font-size: 15px;
line-height: 14px;
border-radius:10px;
color: rgb(191, 191, 191);
padding-left:5px;
}
QLineEdit:hover{
background-color: rgb(68, 68, 68);
}
""")
if input_object.objectName() == "function_input":
input_object.setPlaceholderText("Enter a Function to plot")
elif input_object.objectName() == "minimum_input":
input_object.setPlaceholderText("Value to start from")
elif input_object.objectName() == "maximum_input":
input_object.setPlaceholderText("Value to end at")
class FunctionPlotter(QMainWindow):
"""
application to plot mathematical function
"""
def __init__(self):
super(FunctionPlotter, self).__init__()
# main frames
self.central_widget = QWidget(self)
self.central_widget_grid = QGridLayout(self.central_widget)
self.main_holder = QFrame(self.central_widget)
self.main_holder_grid = QGridLayout(self.main_holder)
# plots display frame
self.plotting_frame = QFrame(self.main_holder)
self.plotting_frame_grid = QGridLayout(self.plotting_frame)
self.display_function_plot = DisplayFunctionPlot()
# inputs holder area
self.inputs_group_box = QGroupBox(self.main_holder)
self.inputs_group_box_grid = QGridLayout(self.inputs_group_box)
# function input
self.function_label = QLabel(self.inputs_group_box)
self.function_input = QLineEdit(self.inputs_group_box)
# maximum input
self.maximum_label = QLabel(self.inputs_group_box)
self.maximum_input = QLineEdit(self.inputs_group_box)
# minimum input
self.minimum_input = QLineEdit(self.inputs_group_box)
self.minimum_label = QLabel(self.inputs_group_box)
# submit button
self.plot_button = QPushButton(self.inputs_group_box)
self.inputs_grid = QGridLayout()
self.inputs_layout = QVBoxLayout()
self.labels_layout = QVBoxLayout()
self.verticalSpacer = QSpacerItem(20, 40, QSizePolicy.Minimum, QSizePolicy.Expanding)
self.set_features()
self.set_text()
self.set_style()
self.set_actions()
def set_style(self):
"""
function to set StyleSheet for the application
"""
self.central_widget.setStyleSheet("""
QWidget{
background-color: rgb(38, 38, 38);
}
QGroupBox{
border: 2px solid #3f3f3f;
border-radius:6px;
background-color: rgb(48, 48, 48);
}
QGroupBox::title {
padding: 3px;
color: rgb(191, 191, 191);
border-radius:6px 6px;
border: 2px solid #3f3f3f;
font-size:22px;
}
QLabel{
font-size:16px;
color: rgb(191, 191, 191);
background-color: transparent;
}
QPushButton {
border:1px solid rgba(79, 79, 79,0.5) ;
border-radius: 6px;
background-color: rgb(79, 79, 79);
color: rgb(191, 191, 191);
font-size:14px;
}
QPushButton:hover {
background-color: rgba(36, 104, 149,0.5);
border:1px solid rgb(56, 170, 202);
}
QPushButton:pressed {
background-color: rgba(36, 104, 149,0.2);
border:1px solid rgb(56, 170, 202);
}
QPushButton:default {
border-color: navy; /* make the default button prominent */
}
QGroupBox{
background-color: rgb(48, 48, 48);
}
QLineEdit{
border:none;
background-color: rgb(63, 63, 63);
font-style: normal;
font-weight: normal;
font-size: 15px;
line-height: 14px;
border-radius:10px;
color: rgb(191, 191, 191);
padding-left:5px;
}
QLineEdit:hover{
background-color: rgb(68, 68, 68);
}
""")
self.plotting_frame.setStyleSheet("border: 2px solid #3f3f3f;"
"border-radius:6px;")
def set_features(self):
"""
set the features and appearance of application's elements
"""
self.setObjectName("self")
self.resize(1024, 720)
self.central_widget.setObjectName("central_widget")
self.central_widget_grid.setObjectName("central_widget_grid")
self.main_holder.setObjectName("main_holder")
self.main_holder.setFrameShape(QFrame.StyledPanel)
self.main_holder.setFrameShadow(QFrame.Raised)
self.main_holder_grid.setObjectName("main_holder_grid")
self.plotting_frame.setObjectName("plotting_frame")
self.plotting_frame.setFrameShape(QFrame.StyledPanel)
self.plotting_frame.setFrameShadow(QFrame.Raised)
self.plotting_frame_grid.setObjectName("plotting_frame_grid")
self.plotting_frame_grid.addWidget(self.display_function_plot)
self.main_holder_grid.addWidget(self.plotting_frame, 0, 1, 1, 1)
self.inputs_group_box.setObjectName("inputs_group_box")
self.inputs_group_box_grid.setObjectName("inputs_group_box_grid")
self.inputs_group_box_grid.setHorizontalSpacing(18)
self.inputs_group_box_grid.setVerticalSpacing(22)
self.inputs_group_box_grid.setContentsMargins(-1, 33, -1, -1)
self.plot_button.setObjectName("plot_button")
self.plot_button.setMinimumSize(QSize(108, 25))
self.inputs_group_box_grid.addWidget(self.plot_button, 1, 0, 1, 1)
self.inputs_grid.setSpacing(6)
self.inputs_grid.setObjectName("inputs_grid")
self.labels_layout.setObjectName("labels_layout")
self.function_label.setObjectName("function_label")
self.labels_layout.addWidget(self.function_label)
self.maximum_label.setObjectName("maximum_label")
self.labels_layout.addWidget(self.maximum_label)
self.minimum_label.setObjectName("minimum_label")
self.labels_layout.addWidget(self.minimum_label)
self.inputs_grid.addLayout(self.labels_layout, 0, 0, 1, 1)
self.inputs_layout.setSpacing(16)
self.inputs_layout.setObjectName("inputs_layout")
self.function_input.setObjectName("function_input")
self.function_input.setMinimumSize(QSize(0, 30))
self.function_input.setAlignment(Qt.AlignJustify | Qt.AlignVCenter)
self.inputs_layout.addWidget(self.function_input)
self.minimum_input.setObjectName("minimum_input")
self.minimum_input.setMinimumSize(QSize(0, 30))
self.minimum_input.setAlignment(Qt.AlignLeading | Qt.AlignLeft | Qt.AlignVCenter)
self.inputs_layout.addWidget(self.minimum_input)
self.maximum_input.setObjectName("maximum_input")
self.maximum_input.setMinimumSize(QSize(0, 30))
self.maximum_input.setAlignment(Qt.AlignLeading | Qt.AlignLeft | Qt.AlignVCenter)
self.inputs_layout.addWidget(self.maximum_input)
self.inputs_grid.addLayout(self.inputs_layout, 0, 1, 1, 1)
self.inputs_group_box_grid.addLayout(self.inputs_grid, 0, 0, 1, 1)
self.inputs_group_box_grid.addItem(self.verticalSpacer, 2, 0, 1, 1)
self.main_holder_grid.addWidget(self.inputs_group_box, 0, 0, 1, 1)
self.main_holder_grid.setColumnStretch(0, 1)
self.main_holder_grid.setColumnStretch(1, 2)
self.central_widget_grid.addWidget(self.main_holder, 0, 0, 1, 1)
self.setCentralWidget(self.central_widget)
QMetaObject.connectSlotsByName(self)
def set_text(self):
"""
set visual text in the app
"""
self.setWindowTitle(QCoreApplication.translate("self", "Function plotter", None))
self.inputs_group_box.setTitle(QCoreApplication.translate("self", "Inputs panel", None))
self.plot_button.setText(QCoreApplication.translate("self", "Plot Function", None))
self.function_label.setText(QCoreApplication.translate("self", "Function:", None))
self.maximum_label.setText(QCoreApplication.translate("self", "minimum:", None))
self.minimum_label.setText(QCoreApplication.translate("self", "maximum:", None))
self.function_input.setPlaceholderText(QCoreApplication.translate("self", "Enter a Function to plot", None))
self.minimum_input.setPlaceholderText(QCoreApplication.translate("self", "Value to start from", None))
self.maximum_input.setPlaceholderText(QCoreApplication.translate("self", "Value to end at", None))
def set_actions(self):
"""
set actions done by elements like( buttons, QLineEdit )
"""
self.plot_button.clicked.connect(lambda: self.get_values())
self.function_input.textEdited.connect(lambda: refactor_style(self.function_input))
self.minimum_input.textEdited.connect(lambda: refactor_style(self.minimum_input))
self.maximum_input.textEdited.connect(lambda: refactor_style(self.maximum_input))
def get_values(self):
"""
accepts data from input fields and
"""
# if input fields has data (not empty)
if self.function_input.text() and self.maximum_input.text() and self.minimum_input.text():
# try to get data that represent the function and replace any hat (^) symbol with double asterisk ( ** )
try:
operation = self.function_input.text().replace('^', '**')
except:
# other than this the (unexpected input) will raise exception
validate_input(self.function_input, massage='Wrong Input')
# try to get data that represent the start of calculations and convert it into float
# other than this the (unexpected input) will raise exception
try:
start_value = float(self.minimum_input.text())
except:
# set default value to 0
start_value = 0
validate_input(self.minimum_input, massage='Wrong Input')
# try to get data that represent the end of calculations and convert it into float
# other than this the (unexpected input) will raise exception
try:
end_value = float(self.maximum_input.text())
except:
# set default value to 0
end_value = 0
validate_input(self.maximum_input, massage='Wrong Input')
try:
# different step in ranges to keep plotting nice and smooth
if 0 < abs(start_value - end_value) <= 10:
x_values = [x for x in np.arange(start_value, end_value, step=0.01)]
elif 10 < abs(start_value - end_value) <= 100:
x_values = [x for x in np.arange(start_value, end_value, step=0.5)]
else:
x_values = [x for x in np.arange(start_value, end_value, step=1)]
y_values = []
for x in x_values:
# to handle this special case of (Zero Division) negative power and
# data range from negative to positive ex: x^-1 , start: -50, end: -50
if x == 0 and "^-" in operation:
x_values[x_values.index(x)] = 0.0001
# evaluate the expression and get result of y
y_values.append(eval(operation))
except:
# in case the operation is wrong or not valid
validate_input(self.function_input, massage='correct format: num*x^n')
if x_values and y_values:
# plot the points in x_values, y_values
self.plot_values(x_values, y_values)
else:
# raise exception if any field is missing
[validate_input(object_name) for object_name
in [self.function_input, self.minimum_input, self.maximum_input]
if not object_name.text()]
def plot_values(self, x_values, y_values):
"""
plot values on x , y
"""
# clear any graphs on the figure
self.display_function_plot.ax.clear()
# restyle the figure
self.display_function_plot.set_style()
# plot function values on x, y
self.display_function_plot.ax.plot(x_values, y_values, color='#08F7FE', linewidth=2, )
# redraw the figure
self.display_function_plot.draw()
if __name__ == "__main__":
app = QApplication(sys.argv)
home_page = FunctionPlotter()
home_page.show()
sys.exit(app.exec_())