profile.py

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"""!
@package wxplot.profile

@brief Profiling using PyPlot

Classes:
 - profile::ProfileFrame
 - profile::ProfileToolbar

(C) 2011 by the GRASS Development Team

This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.

@author Michael Barton, Arizona State University
"""

import os
import sys
import math

import wx
import wx.lib.plot as plot

import grass.script as grass

try:
    import numpy
except ImportError:
    msg = _("This module requires the NumPy module, which could not be "
            "imported. It probably is not installed (it's not part of the "
            "standard Python distribution). See the Numeric Python site "
            "(http://numpy.scipy.org) for information on downloading source or "
            "binaries.")
    print >> sys.stderr, "wxplot.py: " + msg

from wxplot.base       import BasePlotFrame, PlotIcons
from gui_core.toolbars import BaseToolbar, BaseIcons
from wxplot.dialogs    import ProfileRasterDialog, PlotStatsFrame
from core.gcmd         import RunCommand

class ProfileFrame(BasePlotFrame):
    """!Mainframe for displaying profile of one or more raster maps. Uses wx.lib.plot.
    """
    def __init__(self, parent, id = wx.ID_ANY, style = wx.DEFAULT_FRAME_STYLE,
                 size = wx.Size(700, 400),
                 rasterList = [], **kwargs):
        BasePlotFrame.__init__(self, parent, size = size, **kwargs)

        self.toolbar = ProfileToolbar(parent = self)
        self.SetToolBar(self.toolbar)
        self.SetTitle(_("GRASS Profile Analysis Tool"))
        
        #
        # Init variables
        #
        self.rasterList = rasterList
        self.plottype = 'profile'
        self.coordstr = ''              # string of coordinates for r.profile
        self.seglist = []               # segment endpoint list
        self.ppoints = ''               # segment endpoints data         
        self.transect_length = 0.0      # total transect length        
        self.ptitle = _('Profile of')   # title of window
        self.colorList =  ["blue", "red", "green", "yellow", "magenta", "cyan",
                           "aqua", "black", "grey", "orange", "brown", "purple", "violet",
                           "indigo"]
        
        if len(self.rasterList) > 0: # set raster name(s) from layer manager if a map is selected
            self.raster = self.InitRasterOpts(self.rasterList, self.plottype)
        else:
            self.raster = {}
        
        self._initOpts()
        
        # determine units (axis labels)
        if self.parent.Map.projinfo['units'] != '':
            self.xlabel = _('Distance (%s)') % self.parent.Map.projinfo['units']
        else:
            self.xlabel = _("Distance along transect")
        self.ylabel = _("Cell values")
        
    def _initOpts(self):
        """!Initialize plot options
        """
        self.InitPlotOpts('profile')

    def OnDrawTransect(self, event):
        """!Draws transect to profile in map display
        """
        self.mapwin.polycoords = []
        self.seglist = []
        self.mapwin.ClearLines(self.mapwin.pdc)
        self.ppoints = ''

        self.parent.SetFocus()
        self.parent.Raise()
        
        self.mapwin.mouse['use'] = 'profile'
        self.mapwin.mouse['box'] = 'line'
        self.mapwin.pen = wx.Pen(colour = 'Red', width = 2, style = wx.SHORT_DASH)
        self.mapwin.polypen = wx.Pen(colour = 'dark green', width = 2, style = wx.SHORT_DASH)
        self.mapwin.SetCursor(self.Parent.cursors["cross"])

    def OnSelectRaster(self, event):
        """!Select raster map(s) to profile
        """
        dlg = ProfileRasterDialog(parent = self)

        if dlg.ShowModal() == wx.ID_OK:
            self.rasterList = dlg.rasterList
            self.raster = self.InitRasterOpts(self.rasterList, self.plottype)
            
            # plot profile
            if len(self.mapwin.polycoords) > 0 and len(self.rasterList) > 0:
                self.OnCreateProfile(event = None)

        dlg.Destroy()

    def SetupProfile(self):
        """!Create coordinate string for profiling. Create segment list for
           transect segment markers.
        """

        #
        # create list of coordinate points for r.profile
        #                
        dist = 0
        cumdist = 0
        self.coordstr = ''
        lasteast = lastnorth = None
        
        if len(self.mapwin.polycoords) > 0:
            for point in self.mapwin.polycoords:
                # build string of coordinate points for r.profile
                if self.coordstr == '':
                    self.coordstr = '%d,%d' % (point[0], point[1])
                else:
                    self.coordstr = '%s,%d,%d' % (self.coordstr, point[0], point[1])

        if len(self.rasterList) == 0:
            return

        # title of window
        self.ptitle = _('Profile of')

        #
        # create list of coordinates for transect segment markers
        #
        if len(self.mapwin.polycoords) > 0:
            self.seglist = []
            for point in self.mapwin.polycoords:
                # get value of raster cell at coordinate point
                ret = RunCommand('r.what',
                                 parent = self,
                                 read = True,
                                 input = self.rasterList[0],
                                 east_north = '%d,%d' % (point[0],point[1]))
                
                val = ret.splitlines()[0].split('|')[3]
                if val == None or val == '*': continue
                val = float(val)
                
                # calculate distance between coordinate points
                if lasteast and lastnorth:
                    dist = math.sqrt(math.pow((lasteast-point[0]),2) + math.pow((lastnorth-point[1]),2))
                cumdist += dist
                
                #store total transect length
                self.transect_length = cumdist

                # build a list of distance,value pairs for each segment of transect
                self.seglist.append((cumdist,val))
                lasteast = point[0]
                lastnorth = point[1]

            # delete extra first segment point
            try:
                self.seglist.pop(0)
            except:
                pass

        #
        # create datalist of dist/value pairs and y labels for each raster map
        #    
        self.ylabel = ''
        i = 0
        
        for r in self.raster.iterkeys():
            self.raster[r]['datalist'] = []
            datalist = self.CreateDatalist(r, self.coordstr)
            if len(datalist) > 0:   
                self.raster[r]['datalist'] = datalist

                # update ylabel to match units if they exist           
                if self.raster[r]['units'] != '':
                    self.ylabel += '%s (%d),' % (r['units'], i)
                i += 1

                # update title
                self.ptitle += ' %s ,' % r.split('@')[0]

        self.ptitle = self.ptitle.rstrip(',')
            
        if self.ylabel == '':
            self.ylabel = _('Raster values')
        else:
            self.ylabel = self.ylabel.rstrip(',')

    def CreateDatalist(self, raster, coords):
        """!Build a list of distance, value pairs for points along transect using r.profile
        """
        datalist = []
        
        # keep total number of transect points to 500 or less to avoid 
        # freezing with large, high resolution maps
        region = grass.region()
        curr_res = min(float(region['nsres']),float(region['ewres']))
        transect_rec = 0
        if self.transect_length / curr_res > 500:
            transect_res = self.transect_length / 500
        else: transect_res = curr_res
        
        ret = RunCommand("r.profile",
                         parent = self,
                         input = raster,
                         profile = coords,
                         res = transect_res,
                         null = "nan",
                         quiet = True,
                         read = True)
        
        if not ret:
            return []
            
        for line in ret.splitlines():
            dist, elev = line.strip().split(' ')
            if dist == None or dist == '' or dist == 'nan' or \
                elev == None or elev == '' or elev == 'nan':
                continue
            dist = float(dist)
            elev = float(elev)
            datalist.append((dist,elev))

        return datalist

    def OnCreateProfile(self, event):
        """!Main routine for creating a profile. Uses r.profile to
        create a list of distance,cell value pairs. This is passed to
        plot to create a line graph of the profile. If the profile
        transect is in multiple segments, these are drawn as
        points. Profile transect is drawn, using methods in mapdisp.py
        """
            
        if len(self.mapwin.polycoords) == 0 or len(self.rasterList) == 0:
            dlg = wx.MessageDialog(parent = self,
                                   message = _('You must draw a transect to profile in the map display window.'),
                                   caption = _('Nothing to profile'),
                                   style = wx.OK | wx.ICON_INFORMATION | wx.CENTRE)
            dlg.ShowModal()
            dlg.Destroy()
            return

        self.mapwin.SetCursor(self.parent.cursors["default"])
        self.SetCursor(self.parent.cursors["default"])
        self.SetGraphStyle()
        self.SetupProfile()
        p = self.CreatePlotList()
        self.DrawPlot(p)

        # reset transect
        self.mapwin.mouse['begin'] = self.mapwin.mouse['end'] = (0.0,0.0)
        self.mapwin.mouse['use'] = 'pointer'
        self.mapwin.mouse['box'] = 'point'

    def CreatePlotList(self):
        """!Create a plot data list from transect datalist and
            transect segment endpoint coordinates.
        """
        # graph the distance, value pairs for the transect
        self.plotlist = []

        # Add segment marker points to plot data list
        if len(self.seglist) > 0 :
            self.ppoints = plot.PolyMarker(self.seglist,
                                           legend = ' ' + self.properties['marker']['legend'],
                                           colour = wx.Color(self.properties['marker']['color'][0],
                                                           self.properties['marker']['color'][1],
                                                           self.properties['marker']['color'][2],
                                                           255),
                                           size = self.properties['marker']['size'],
                                           fillstyle = self.ptfilldict[self.properties['marker']['fill']],
                                           marker = self.properties['marker']['type'])
            self.plotlist.append(self.ppoints)

        # Add profile distance/elevation pairs to plot data list for each raster profiled
        for r in self.rasterList:
            col = wx.Color(self.raster[r]['pcolor'][0],
                           self.raster[r]['pcolor'][1],
                           self.raster[r]['pcolor'][2],
                           255)
            self.raster[r]['pline'] = plot.PolyLine(self.raster[r]['datalist'],
                                                    colour = col,
                                                    width = self.raster[r]['pwidth'],
                                                    style = self.linestyledict[self.raster[r]['pstyle']],
                                                    legend = self.raster[r]['plegend'])

            self.plotlist.append(self.raster[r]['pline'])

        if len(self.plotlist) > 0:        
            return self.plotlist
        else:
            return None

    def Update(self):
        """!Update profile after changing options
        """
        self.SetGraphStyle()
        p = self.CreatePlotList()
        self.DrawPlot(p)

    def SaveProfileToFile(self, event):
        """!Save r.profile data to a csv file
        """    
        wildcard = _("Comma separated value (*.csv)|*.csv")
        
        dlg = wx.FileDialog(parent = self,
                            message = _("Path and prefix (for raster name) to save profile values..."),
                            defaultDir = os.getcwd(), 
                            defaultFile = "",  wildcard = wildcard, style = wx.SAVE)
        if dlg.ShowModal() == wx.ID_OK:
            path = dlg.GetPath()
            
            for r in self.rasterList:
                pfile = path+'_'+str(r['name'])+'.csv'
                try:
                    file = open(pfile, "w")
                except IOError:
                    wx.MessageBox(parent = self,
                                  message = _("Unable to open file <%s> for writing.") % pfile,
                                  caption = _("Error"), style = wx.OK | wx.ICON_ERROR | wx.CENTRE)
                    return False
                for datapair in self.raster[r]['datalist']:
                    file.write('%d,%d\n' % (float(datapair[0]),float(datapair[1])))
                                        
                file.close()

        dlg.Destroy()
        
    def OnStats(self, event):
        """!Displays regression information in messagebox
        """
        message = []
        title = _('Statistics for Profile(s)')

        for r in self.raster.iterkeys():
            try:
                rast = r.split('@')[0] 
                statstr = 'Profile of %s\n\n' % rast

                iterable = (i[1] for i in self.raster[r]['datalist'])            
                a = numpy.fromiter(iterable, numpy.float)
                
                statstr += 'n: %f\n' % a.size
                statstr += 'minimum: %f\n' % numpy.amin(a)
                statstr += 'maximum: %f\n' % numpy.amax(a)
                statstr += 'range: %f\n' % numpy.ptp(a)
                statstr += 'mean: %f\n' % numpy.mean(a)
                statstr += 'standard deviation: %f\n' % numpy.std(a)
                statstr += 'variance: %f\n' % numpy.var(a)
                cv = numpy.std(a)/numpy.mean(a)
                statstr += 'coefficient of variation: %f\n' % cv
                statstr += 'sum: %f\n' % numpy.sum(a)
                statstr += 'median: %f\n' % numpy.median(a)
                statstr += 'distance along transect: %f\n\n' % self.transect_length       
                message.append(statstr)
            except:
                pass
            
        stats = PlotStatsFrame(self, id = wx.ID_ANY, message = message, 
                               title = title)

        if stats.Show() == wx.ID_CLOSE:
            stats.Destroy()       

    
class ProfileToolbar(BaseToolbar):
    """!Toolbar for profiling raster map
    """ 
    def __init__(self, parent):
        BaseToolbar.__init__(self, parent)
        
        self.InitToolbar(self._toolbarData())
        
        # realize the toolbar
        self.Realize()
        
    def _toolbarData(self):
        """!Toolbar data"""
        return self._getToolbarData((('addraster', BaseIcons["addRast"],
                                      self.parent.OnSelectRaster),
                                     ('transect', PlotIcons["transect"],
                                      self.parent.OnDrawTransect),
                                     (None, ),
                                     ('draw', PlotIcons["draw"],
                                      self.parent.OnCreateProfile),
                                     ('erase', BaseIcons["erase"],
                                      self.parent.OnErase),
                                     ('drag', BaseIcons['pan'],
                                      self.parent.OnDrag),
                                     ('zoom', BaseIcons['zoomIn'],
                                      self.parent.OnZoom),
                                     ('unzoom', BaseIcons['zoomBack'],
                                      self.parent.OnRedraw),
                                     (None, ),
                                     ('statistics', PlotIcons['statistics'],
                                      self.parent.OnStats),
                                     ('datasave', PlotIcons["save"],
                                      self.parent.SaveProfileToFile),
                                     ('image', BaseIcons["saveFile"],
                                      self.parent.SaveToFile),
                                     ('print', BaseIcons["print"],
                                      self.parent.PrintMenu),
                                     (None, ),
                                     ('settings', PlotIcons["options"],
                                      self.parent.PlotOptionsMenu),
                                     ('quit', PlotIcons["quit"],
                                      self.parent.OnQuit),
                                     ))