import sys, os, random
from PyQt4 import QtGui, QtCore

from numpy import arange, sin, pi, array, linspace
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
from matplotlib.path import Path
import matplotlib.patches as patches

from scipy.interpolate import *

progname = os.path.basename(sys.argv[0])
progversion = "0.1"


class MyMplCanvas(FigureCanvas):
    """Ultimately, this is a QWidget (as well as a FigureCanvasAgg, etc.)."""
    def __init__(self, parent=None, width=5, height=4, dpi=100):
        fig = Figure(figsize=(width, height), dpi=dpi)
        self.axes = fig.add_subplot(111)
        # We want the axes cleared every time plot() is called
        self.axes.hold(False)

        self.compute_initial_figure()

        #
        FigureCanvas.__init__(self, fig)
        self.setParent(parent)

        FigureCanvas.setSizePolicy(self,
                                   QtGui.QSizePolicy.Expanding,
                                   QtGui.QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)

    def compute_initial_figure(self):
        pass


class MyDynamicMplCanvas(MyMplCanvas):
    """A canvas that updates itself every second with a new plot."""
    def __init__(self, *args, **kwargs):
        MyMplCanvas.__init__(self, *args, **kwargs)
        timer = QtCore.QTimer(self)
        QtCore.QObject.connect(timer, QtCore.SIGNAL("timeout()"), self.update_figure)
        timer.start(1000)

    def compute_initial_figure(self):
        x1_min = 150-20.
        y1_min = 150.

        x2_min = x1_min + 100.
        y2_min = 200.

        x3_min = x2_min + 20.
        y3_min = 220.

        x4_min = x3_min + 249. - y3_min
        y4_min = 249.

        x5_min = x4_min + (y4_min - y3_min) / 3 * 2
        y5_min = y3_min

        x6_min = x5_min + y5_min-20.
        y6_min = 20.

        p1x = array([0., x1_min, x2_min, x3_min, x4_min, x5_min, x6_min])
        p1y = array([20., y1_min, y2_min, y3_min, y4_min, y5_min, y6_min])

        interp = pchip(p1x, p1y)

        xx = linspace(0., x6_min, x6_min)

        ynew = interp(xx)

        print "len xx", len(xx)
        print "len p1x", len(p1x)
        print "xy", zip(p1x, p1y)
        print "ynew", ynew

        dtp_min = 99999.
        dtp_max = 0.
        dtpi = -1

        dtn_min = -99999.
        dtn_max = 0.
        dtni = -1
        for i in xrange(1, len(ynew)):
          tmp = ynew[i] - ynew[i-1]
          if tmp > 0:
            if tmp < dtp_min:
              dtp_min = tmp
              dtpi = i
            elif tmp > dtp_max:
              dtp_max = tmp
              dtpi = i
          elif tmp < 0:
            if tmp > dtn_min:
              dtn_min = tmp
              dtni = i
            elif tmp < dtn_max:
              dtn_max = tmp
              dtni = i
        print "max negative", dtn_min, dtn_max, dtni
        print "max positive", dtp_min, dtp_max, dtpi

        self.axes.plot(p1x, p1y, "bo", xx, ynew, "r-")
        #self.axes.plot(p1x, p1y, 'r-o')

    def update_figure(self):
        # Build a list of 4 random integers between 0 and 10 (both inclusive)
        #l = [ random.randint(0, 10) for i in xrange(4) ]

        #self.axes.plot([0, 1, 2, 3], l, 'r')
        #self.draw()
        pass


class ApplicationWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
        self.setWindowTitle("application main window")

        self.file_menu = QtGui.QMenu('&File', self)
        self.file_menu.addAction('&Quit', self.fileQuit,
                                 QtCore.Qt.CTRL + QtCore.Qt.Key_Q)
        self.menuBar().addMenu(self.file_menu)

        self.help_menu = QtGui.QMenu('&Help', self)
        self.menuBar().addSeparator()
        self.menuBar().addMenu(self.help_menu)

        self.help_menu.addAction('&About', self.about)

        self.main_widget = QtGui.QWidget(self)

        l = QtGui.QVBoxLayout(self.main_widget)
        #sc = MyStaticMplCanvas(self.main_widget, width=5, height=4, dpi=100)
        dc = MyDynamicMplCanvas(self.main_widget, width=5, height=4, dpi=100)
        #l.addWidget(sc)
        l.addWidget(dc)

        self.main_widget.setFocus()
        self.setCentralWidget(self.main_widget)

        self.statusBar().showMessage("All hail matplotlib!", 2000)

    def fileQuit(self):
        self.close()

    def closeEvent(self, ce):
        self.fileQuit()

    def about(self):
        QtGui.QMessageBox.about(self, "About %s" % progname,
u"""%(prog)s version %(version)s
Copyright \N{COPYRIGHT SIGN} 2005 Florent Rougon, 2006 Darren Dale

This program is a simple example of a Qt4 application embedding matplotlib
canvases.

It may be used and modified with no restriction; raw copies as well as
modified versions may be distributed without limitation."""
% {"prog": progname, "version": progversion})


qApp = QtGui.QApplication(sys.argv)

aw = ApplicationWindow()
aw.setWindowTitle("%s" % progname)
aw.show()
sys.exit(qApp.exec_())