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#!/usr/bin/env python
import sys, random
from qt import *
TRUE = 1
FALSE = 0
MAXPOINTS = 2000; # maximum number of points
MAXCOLORS = 40;
#
# ConnectWidget - draws connected lines
#
class ConnectWidget(QWidget):
def __init__(self):
QWidget.__init__(self)
self.setEraseColor( Qt.white ) # white background
self.count = 0;
self.down = FALSE
self.points = []
self.colors = []
for i in range(MAXPOINTS): # init arrays
self.points.append(QPoint())
for i in range(MAXCOLORS):
self.colors.append(QColor( random.randint(0,255), random.randint(0,255), random.randint(0,255) ))
#
# Handles paint events for the connect widget.
#
def paintEvent(self, pe):
paint = QPainter( self )
for i in range(self.count-1): # connect all points
for j in range(i+1, self.count):
paint.setPen( self.colors[random.randint(0,MAXCOLORS-1)] ) # set random pen color
paint.drawLine( self.points[i], self.points[j] ) # draw line
#
# Handles mouse press events for the connect widget.
#
def mousePressEvent(self, me):
self.down = TRUE
self.count = 0 # start recording points
self.erase() # erase widget contents
#
# Handles mouse release events for the connect widget.
#
def mouseReleaseEvent(self, me ):
self.down = FALSE # done recording points
self.update() # draw the lines
#
# Handles mouse move events for the connect widget.
#
def mouseMoveEvent(self, me):
if self.down and self.count < MAXPOINTS:
paint = QPainter( self )
self.points[self.count] = QPoint(me.pos()) # add point
paint.drawPoint( me.pos() ) # plot point
self.count = self.count+1
#
# Create and display a ConnectWidget.
#
a = QApplication( sys.argv )
connect = ConnectWidget()
connect.setCaption( "PyQt Example - Draw lines")
a.setMainWidget( connect )
connect.show()
a.exec_loop()
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