Using ERIC6 and PYQT5 to achieve Python's extreme GUI Programming (series)----Drawing (Drawing) (2)--Draw points

Overview

This article implements the following program: ( in the form of painting the [-100, 100] Two period of the sine function image )

The main steps are as follows:

1. Create a new project in Eric6, create a new form

2, (automatically open) into PyQt5 Desinger, edit the GUI, save

3, back to Eric 6, to the previous step to get the interface file Drawing.ui file right-click, compile the form, get ui_drawing.py file

4, then right-click on the Drawing.ui file, generate dialog code, get drawing.py file. ( add your own program logic in drawing.py )

5, Py2exe package into EXE file (this step)

Body

Next to "Overview" Step 4th:

In drawing.py, the paint event is defined first:

    def paintevent (Self, event):         = Qtgui.qpainter ()        qp.begin (self)        self.drawpoints (QP) #自定义画点方法        qp.end ()

Then, customize the Draw point method :

    def drawpoints (self,  qp):        qp.setpen (QtCore.Qt.red)        = self.size ()                for  in range:            #  [-100, 100] Two period sine function image            x = -1+2.0*i/ + size.width ()/2.0            = -50*math.sin ((x-size.width ()/2.0) *math.pi/50) + size.height ()/2.0             qp.drawpoint (x, y)

Together, drawing.py is like this:

#-*-coding:utf-8-*-"""Module implementing Drawing."""Importsys, Math fromPyQt5ImportQtgui, Qtcore fromPyqt5.qtwidgetsImportQdialog, Qapplication fromUi_drawingImportui_drawingclassDrawing (Qdialog, ui_drawing):def __init__(Self, parent=None): Super (Drawing, self).__init__(parent) self.setupui (self)defpaintevent (Self, event): QP=Qtgui.qpainter () qp.begin (self) self.drawpoints (QP)#自定义画点方法qp.end ()defdrawpoints (Self, QP): Qp.setpen (QtCore.Qt.red) Size=self.size () forIinchRange (1000):            #[-100, 100] Two-period sine function imagex = * ( -1+2.0*i/1000) + size.width ()/2.0y= -50*math.sin ((x-size.width ()/2.0) *math.pi/50) + size.height ()/2.0qp.drawpoint (x, y)if __name__=='__main__': App=qapplication (SYS.ARGV) dlg=Drawing () dlg.show () Sys.exit (App.exec_ ())

(Welcome reprint, but please keep the author's name and the original link.) ）

Using ERIC6 and PYQT5 to achieve Python's extreme GUI Programming (series)----Drawing (Drawing) (2)--Draw points