import sys

from qt import *
from qtcanvas import *

class App( QApplication ):

    def __init__( self, args ):
        QApplication.__init__( self, args )
        
        self.a = 0
        self.b = 0

        tmp = map( float, sys.stdin.readlines() ) # read as numbers

        # Rescale values to the interval [0..1]
        ( mn, mx ) = ( min( tmp ), max( tmp ) )
        self.data = map( lambda x: (x-mn)/(mx-mn), tmp )
        
        self.mw = QHBox()
        self.mw.setFixedWidth( 693 )
        self.mw.setFixedHeight( 405 )

        self.canvas = QCanvas( 640, 400 )
        self.view = QCanvasView( self.canvas, self.mw )

        self.a_display = QCanvasText( str(self.a), self.canvas )
        self.a_display.setX( 3 )
        self.a_display.setY( 6 )

        self.b_display = QCanvasText( str(self.b), self.canvas )
        self.b_display.setX( 3 )
        self.b_display.setY( 20 )

        # Obtain a bunch of canvas-widgets. Don't set their coordinates yet.
        self.raw = []
        self.smooth = []
        for d in self.data:
            tmp = QCanvasLine( self.canvas )
            tmp.setPen( QPen( QColor( 'red' ) ) )        
            self.raw.append( tmp )

            tmp = QCanvasLine( self.canvas )
            tmp.setPen( QPen( QColor( 'blue' ) ) )        
            self.smooth.append( tmp )

        self.sli_a = QSlider( self.mw )
        self.sli_a.setFixedHeight( 200 )
        self.sli_b = QSlider( self.mw )
        self.sli_b.setFixedHeight( 200 )

        self.connect( self.sli_a, SIGNAL( "valueChanged(int)" ), self.changeA )
        self.connect( self.sli_b, SIGNAL( "valueChanged(int)" ), self.changeB )

        self.setMainWidget( self.mw ) # closing window terminates program
        self.mw.show()

        self.redraw()

    def redraw( self ):
        length = len( self.data )        

        s0 = self.data[0]
        s1 = self.data[0]
        t  = 0

        for i in xrange( length - 1 ):
            x0 = float(i)/length
            x1 = float(i+1)/length

            y0 = self.data[i]
            y1 = self.data[i+1]

            self.raw[i].setPoints( 640*x0, 400*(1-y0), 640*x1, 400*(1-y1) )
            self.raw[i].show()

            s0 = s1
            s1 = self.a*self.data[i+1] + (1-self.a)*(s1 + t)
            t  = self.b*(s1 - s0) + (1-self.b)*t

            self.smooth[i].setPoints( 640*x0, 400*(1-s0), 640*x1, 400*(1-s1) )
            self.smooth[i].show()

        self.a_display.setText( str( self.a ) )
        self.b_display.setText( str( self.b ) )

        self.a_display.show()
        self.b_display.show()
        
        self.canvas.update()
        
    def changeA( self, val ):
        self.a = float(val)/100.0
        self.redraw()

    def changeB( self, val ):
        self.b = float(val)/100.0
        self.redraw()               

app = App( sys.argv )
app.exec_loop()