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#!/usr/bin/python
# python scatterplot.py <qtversion (4 or 5)>
# Tested for python3 Qt5. Crashes if mose is over plot canvas
import sys
sys.path.append('../sip/')
import math
#import Qwt
from PyQt4 import Qwt
#import numpy as np
from PyQt4.QtCore import Qt, QSize, qrand, QPointF
from PyQt4.QtGui import QColor, QPixmap, QFont, QIcon, QPen, QPolygonF, QMainWindow, QWidget, QToolBar, QToolButton, QHBoxLayout, QLabel, QApplication
def randomValue():
#a number between [ 0.0, 1.0 ]
return ( qrand() % 100000 ) / 100000.0
class DistancePicker(Qwt.QwtPlotPicker):
def __init__(self, canvas):
Qwt.QwtPlotPicker.__init__(self, canvas)
self.setTrackerMode( Qwt.QwtPicker.ActiveOnly )
self.setStateMachine( Qwt.QwtPickerDragLineMachine() )
self.setRubberBand( Qwt.QwtPlotPicker.PolygonRubberBand )
def trackerTextF(self, pos ):
text = QwtText()
points = self.selection();
if ( not points.isEmpty() ):
#QString num
#num.setNum( QLineF( pos, invTransform( points[0] ) ).length() )
num = "123"
bg = QColor( Qt.white )
bg.setAlpha( 200 )
text.setBackgroundBrush( QBrush( bg ) )
text.setText( num )
return text
class Plot( Qwt.QwtPlot ):
def __init__(self, parent=None):
Qwt.QwtPlot.__init__(self, parent)
self.canvas().setStyleSheet(
"border: 2px solid Black;"
"border-radius: 15px;"
"background-color: qlineargradient( x1: 0, y1: 0, x2: 0, y2: 1,"
"stop: 0 LemonChiffon, stop: 1 PaleGoldenrod );"
)
# attach curve
self.d_curve = Qwt.QwtPlotCurve( "Scattered Points" )
self.d_curve.setPen( QColor( "Purple" ) )
# when using QwtPlotCurve.ImageBuffer simple dots can be
# rendered in parallel on multicore systems.
self.d_curve.setRenderThreadCount( 0 ) # 0: use QThread.idealThreadCount()
self.d_curve.attach( self )
self.setSymbol( None )
# panning with the left mouse button
Qwt.QwtPlotPanner( self.canvas() )
# zoom in/out with the wheel
#magnifier = Qwt.QwtPlotMagnifier( self.canvas() ) FIXME
#magnifier.setMouseButton( Qt.NoButton )
# distanve measurement with the right mouse button
self.picker = DistancePicker( self.canvas() )
self.picker.setMousePattern( Qwt.QwtPlotPicker.MouseSelect1, Qt.RightButton )
self.picker.setRubberBandPen( QPen( Qt.blue ) )
def setSymbol( self, symbol ):
self.d_curve.setSymbol( symbol )
if ( symbol == None):
self.d_curve.setStyle( Qwt.QwtPlotCurve.Dots )
def setSamples(self, samples ):
self.d_curve.setPaintAttribute( Qwt.QwtPlotCurve.ImageBuffer, samples.size() > 1000 )
self.d_curve.setSamples( samples )
class MainWindow(QMainWindow):
def __init__(self, *args):
QMainWindow.__init__(self, *args)
self.d_plot = Plot( self )
self.d_plot.setTitle( "Scatter Plot" )
self.setCentralWidget( self.d_plot )
# a million points
self.setSamples( 100000 );
def setSamples(self, numPoints ):
samples = QPolygonF()
for i in range(numPoints):
x = randomValue() * 24.0 + 1.0;
y = math.log( 10.0 * ( x - 1.0 ) + 1.0 ) * ( randomValue() * 0.5 + 0.9 )
samples += QPointF( x, y )
self.d_plot.setSamples( samples )
a = QApplication( sys.argv )
m = MainWindow()
m.resize( 800, 600 )
m.show()
sys.exit(a.exec_())
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