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#!/usr/bin/python
# -*- coding: utf-8 -*-
# Lissajou.py
import sys
from PyQt4 import QtGui, QtCore
import math
import random
class Liss ( QtGui.QWidget ) :
def __init__ ( self, parent = None ) :
QtGui.QWidget.__init__ ( self, parent )
self.resize ( 500, 500 )
self.setWindowTitle ( 'Lissajou' )
self.timer = QtCore.QTimer ()
QtCore.QObject.connect ( self.timer, QtCore.SIGNAL("timeout()"), self.NextStep )
self.resetParams ()
self.painter = QtGui.QPainter ()
self.pen1 = QtGui.QPen ( QtGui.QColor ( "yellow" ), 2, QtCore.Qt.SolidLine )
self.pen2 = QtGui.QPen ( QtGui.QColor ( "white" ), 2, QtCore.Qt.SolidLine )
self.timer.start ( 40 )
def resetParams ( self ) : # default values
self.M = random.randint ( 10, 10000 )
self.L = random.randint ( 10, 10000 )
self.N = random.randint ( 5, 40 ) # number of line strokes
self.B = 2 * math.pi / self.N # intermediar coeficient
self.step = 0 # current step
self.SPT = 100 # spt - steps per transition from one figure to another
self.d = 0 # current delta which depends on frame, intermediar coeficient representing current step
self.pause = 0 # number of steps to wait when a transition is over
self.step_direction = 1
def NextStep ( self ) : # increase step and calculate coeficients for it
if self.pause > 0:
self.pause -= 1
return
self.step += self.step_direction
if self.step > self.SPT or self.step < 0:
self.step = ( self.step + self.SPT ) % self.SPT
self.M += self.step_direction
self.L += self.step_direction
self.pause = 20
self.d = 0.5 * ( 1 - math.cos ( math.pi * self.step / self.SPT ) ) # angular step
self.l = ( self.L + self.d ) * self.B
self.m = ( self.M + self.d ) * self.B
self.update ()
def paintEvent ( self, event ) :
if self.pixmap is None : return
self.pixmap.fill ( QtGui.QColor ( "black" ) )
self.painter.begin ( self.pixmap )
self.painter.setRenderHint ( self.painter.Antialiasing )
w2 = self.w / 2 #center
h2 = self.h / 2
x1 = round ( w2 )
y1 = self.h
for k in range ( 1, self.N + 1 ):
x2 = round ( w2 * ( math.sin ( k * self.m ) + 1 ) )
y2 = round ( h2 * ( math.cos ( k * self.l ) + 1 ) )
self.painter.setPen ( self.pen1 if k % 2 else self.pen2 )
self.painter.drawLine ( x1, y1, x2, y2 )
x1, y1 = x2, y2
self.painter.end ()
self.painter.begin ( self )
self.painter.drawPixmap ( 0, 0, self.pixmap )
self.painter.end ()
def resizeEvent (self, event ) :
self.h = self.height ()
self.w = self.width ()
self.pixmap = QtGui.QPixmap ( self.w, self.h )
def keyPressEvent (self, event ) :
if event.key () == QtCore.Qt.Key_Escape : self.close ()
if event.key () == QtCore.Qt.Key_Space : self.resetParams ()
app = QtGui.QApplication ( sys.argv )
dt = Liss ()
dt.show ()
app.exec_ ()
ЗЫ очень читабельный язык питон
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Тема: Python + Qt4 (Прочитано 8064 раз)
