| 1 | #-------------------------------------------------------------------------------
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| 2 | # Name: SpectralGraph
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| 3 | # Purpose:
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| 4 | #
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| 5 | # Author: Kelvin
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| 6 | #
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| 7 | # Created: 02/01/2014
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| 8 | #-------------------------------------------------------------------------------
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| 9 |
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| 10 | import matplotlib.pyplot as plt
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| 11 | import matplotlib.widgets as mwidgets
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| 12 | import matplotlib.cm as cm
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| 13 |
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| 14 | from matplotlib.figure import Figure
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| 15 | from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
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| 16 |
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| 17 | from numpy import *
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| 18 |
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| 19 | from PyQt4 import QtCore
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| 20 |
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| 21 | import pywcs
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| 22 |
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| 23 | class SpectralGraph(FigureCanvas):
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| 24 |
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| 25 | def __init__(self, Results, maskFits, realFits, maskImage):
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| 26 |
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| 27 | # Create the figure containing our final image
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| 28 | self.fig = Figure()
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| 29 |
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| 30 | self.channelText = self.fig.text(0.9, 0.15, '')
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| 31 | self.velocityText = self.fig.text(0.9, 0.30, '')
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| 32 | self.intensityText = self.fig.text(0.9, 0.45, '')
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| 33 |
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| 34 | self.descriptionText = self.fig.text(0.65, 0.95, '')
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| 35 |
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| 36 | self.ax = self.fig.add_subplot(111)
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| 37 | self.ax.cla()
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| 38 | #self.ax.plot(arange(0, self.lenZ), zeros(self.lenZ))
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| 39 | self.ax.set_xlabel('Frequency Channels (GHz)')
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| 40 | self.ax.set_ylabel('Intensity (mJ)')
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| 41 | self.spectralTitle = self.fig.suptitle("Spectral Characteristic")
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| 42 |
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| 43 | # Initialise the parent class
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| 44 | FigureCanvas.__init__(self, self.fig)
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| 45 |
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| 46 | self.Results = Results
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| 47 |
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| 48 | # Those are our data cubes
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| 49 | self.maskCube = maskFits[0].data
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| 50 | self.realCube = realFits[0].data
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| 51 |
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| 52 | self.maskImage = maskImage
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| 53 |
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| 54 | # Those are the size of our data cubes
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| 55 | [self.lenZ, self.lenY, self.lenX] = self.maskCube.shape
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| 56 |
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| 57 | self.maskHeader = maskFits[0].header
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| 58 |
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| 59 | hdr = bytes(self.maskHeader.tostring(), 'utf-8')
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| 60 |
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| 61 | imwcs = pywcs.WCS(header = hdr)
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| 62 |
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| 63 | self.freq = arange(0, self.lenZ)
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| 64 |
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| 65 | self.vel = imwcs.wcs.crval[2] + imwcs.wcs.cdelt[2]*(self.freq - imwcs.wcs.crpix[2])
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| 66 |
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| 67 | self.velunit = str(imwcs.wcs.cunit[2], 'utf-8')
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| 68 |
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| 69 | self.zAxis = 'vel'
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| 70 |
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| 71 | fx = maskFits[0].header.get('BMAJ')
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| 72 | fy = maskFits[0].header.get('BMIN')
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| 73 |
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| 74 | self.C = pi*fx*fy/(4*log(2))
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| 75 |
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| 76 | self.zmin = 0
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| 77 | self.zmax = self.lenZ
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| 78 |
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| 79 | self.currentObjID = 0
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| 80 |
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| 81 | self.spectralType = 'max'
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| 82 |
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| 83 | self.trackCursorLink = self.mpl_connect('motion_notify_event', self.trackCursor)
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| 84 | self.changeZaxisLink = self.mpl_connect('button_press_event', self.changeZaxis)
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| 85 |
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| 86 | self.intensityUnit = 'Jy/beam'
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| 87 | self.draw()
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| 88 | self.show()
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| 89 |
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| 90 | def plotMax(self):
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| 91 |
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| 92 | self.spectralType = 'max'
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| 93 | self.intensityUnit = 'Jy/beam'
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| 94 | self.plotSource()
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| 95 |
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| 96 | def plotSum(self):
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| 97 |
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| 98 | self.spectralType = 'sum'
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| 99 | self.intensityUnit = 'Jy'
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| 100 | self.plotSource()
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| 101 |
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| 102 | def changeZaxis(self, event):
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| 103 |
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| 104 | if event.button != 1:
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| 105 | return
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| 106 |
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| 107 | if self.zAxis == 'vel':
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| 108 | self.zAxis = 'freq'
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| 109 | else:
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| 110 | self.zAxis = 'vel'
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| 111 |
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| 112 | self.plotSource()
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| 113 |
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| 114 | def setCurrentObjID(self, ObjID):
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| 115 |
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| 116 | self.currentObjID = ObjID
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| 117 |
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| 118 | def trackCursor(self, event):
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| 119 |
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| 120 | if not event.inaxes:
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| 121 | return
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| 122 |
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| 123 | self.channelText.set_text('Freq. Channel: %d'%(int(event.xdata)))
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| 124 | self.velocityText.set_text('Velocity: %.3f k%s'%(self.vel[int(event.xdata)]/1000, self.velunit))
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| 125 | self.intensityText.set_text('Intensity: %.3f %s'%(event.ydata, self.intensityUnit))
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| 126 | self.draw()
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| 127 |
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| 128 | def plotSource(self):
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| 129 |
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| 130 | self.ax.cla()
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| 131 |
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| 132 | if self.currentObjID <= 0 or (self.spectralType != 'max' and self.spectralType != 'sum'):
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| 133 | self.draw()
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| 134 | return
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| 135 |
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| 136 |
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| 137 | ObjStats = self.Results.SkyObjects[self.currentObjID].stats
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| 138 |
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| 139 | if self.spectralType == 'max':
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| 140 |
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| 141 | x_peak = ObjStats['X_peak']
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| 142 | y_peak = ObjStats['Y_peak']
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| 143 | flux = self.realCube[:, y_peak, x_peak]
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| 144 |
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| 145 | self.descriptionText.set_text('Peak Intensity occurs at (x, y) = (%d, %d)'%(x_peak, y_peak))
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| 146 |
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| 147 | self.intensityUnit = 'Jy/beam'
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| 148 | self.ax.set_ylabel('Intensity (%s)'%self.intensityUnit)
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| 149 |
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| 150 | elif self.spectralType == 'sum':
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| 151 |
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| 152 | flux = zeros(self.freq.shape)
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| 153 |
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| 154 | x1 = ObjStats['X1']
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| 155 | x2 = ObjStats['X2']
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| 156 | y1 = ObjStats['Y1']
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| 157 | y2 = ObjStats['Y2']
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| 158 |
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| 159 | for x in range(x1, x2 + 1):
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| 160 | for y in range(y1, y2 + 1):
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| 161 |
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| 162 | if self.maskImage[y][x] == self.currentObjID:
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| 163 |
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| 164 | flux += self.realCube[:, y, x]
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| 165 |
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| 166 | flux = self.C*flux
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| 167 |
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| 168 | self.intensityUnit = 'Jy'
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| 169 | self.ax.set_ylabel('Intensity (%s)'%self.intensityUnit)
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| 170 |
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| 171 | self.spectralTitle.set_text("Spectral Characteristic of Source " + str(self.currentObjID))
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| 172 |
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| 173 | self.linef1 = self.ax.axvline(x = self.Results.zf1, color = "r")
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| 174 | self.linef2 = self.ax.axvline(x = self.Results.zf2, color = "r")
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| 175 |
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| 176 | z1 = ObjStats['Z1']
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| 177 | z2 = ObjStats['Z2']
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| 178 |
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| 179 | self.linef1 = self.ax.axvline(x = z1, color = "g", linestyle = "--")
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| 180 | self.linef2 = self.ax.axvline(x = z2, color = "g", linestyle = "--")
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| 181 |
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| 182 | self.minflux = flux[0]
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| 183 | self.maxflux = flux[0]
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| 184 |
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| 185 | for z in range(self.lenZ):
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| 186 |
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| 187 | if z >= self.Results.zf1 and z <= self.Results.zf2:
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| 188 | pass
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| 189 | else:
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| 190 |
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| 191 | if flux[z] < self.minflux:
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| 192 | self.minflux = flux[z]
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| 193 |
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| 194 | if flux[z] > self.maxflux:
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| 195 | self.maxflux = flux[z]
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| 196 |
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| 197 | self.fluxrange = self.maxflux - self.minflux
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| 198 | self.fluxstep = 0.1*self.fluxrange
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| 199 | self.fluxbottom = self.minflux - self.fluxstep
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| 200 | self.fluxtop = self.maxflux + self.fluxstep
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| 201 | self.fluxsteps = arange(self.fluxbottom, self.fluxtop, self.fluxstep)
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| 202 |
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| 203 | zf1_ratio = self.Results.zf1/self.lenZ
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| 204 | zf2_ratio = self.Results.zf2/self.lenZ
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| 205 |
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| 206 | for f in self.fluxsteps:
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| 207 |
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| 208 | self.ax.axhline(y = f, xmin = zf1_ratio, xmax = zf2_ratio, color = "r")
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| 209 |
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| 210 | zspace = 10
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| 211 |
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| 212 | self.zmin = max(0, z1 - zspace)
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| 213 | self.zmax = min(z2 + zspace, self.lenZ)
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| 214 |
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| 215 | self.ax.plot(self.freq, flux)
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| 216 | self.ax.set_xlim(0, self.lenZ)
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| 217 |
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| 218 | if self.zAxis == 'freq':
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| 219 |
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| 220 | self.ax.set_xlabel('Frequency Channels (Channel Number)')
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| 221 | else:
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| 222 |
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| 223 | xticks = self.ax.get_xticks()
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| 224 |
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| 225 | velticklabels = []
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| 226 | for xtick in xticks:
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| 227 |
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| 228 | if xtick >= 0 and xtick < self.lenZ:
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| 229 |
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| 230 | velticklabel = '%.3f'%(self.vel[int(xtick)]/1000)
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| 231 |
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| 232 | velticklabels += [velticklabel]
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| 233 |
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| 234 | self.ax.set_xticklabels(velticklabels)
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| 235 | self.ax.set_xlabel('Velocity (%s%s)'%('k',self.velunit))
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| 236 |
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| 237 |
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| 238 | self.ax.set_ylim(self.fluxbottom, self.fluxtop)
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| 239 | self.draw()
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| 240 |
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| 241 |
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| 242 |
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| 243 | class ZoomGraph(SpectralGraph):
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| 244 |
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| 245 | trackCursorSignal = QtCore.pyqtSignal(object)
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| 246 |
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| 247 | def __init__(self, Results, maskFits, realFits, maskImage):
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| 248 |
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| 249 | SpectralGraph.__init__(self, Results, maskFits, realFits, maskImage)
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| 250 |
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| 251 | def trackCursor(self, event):
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| 252 |
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| 253 | self.trackCursorSignal.emit(event)
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| 254 |
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| 255 | def plotSource(self):
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| 256 |
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| 257 | self.ax.cla()
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| 258 |
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| 259 | if self.currentObjID <= 0 or (self.spectralType != 'max' and self.spectralType != 'sum'):
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| 260 | self.draw()
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| 261 | return
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| 262 |
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| 263 |
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| 264 | ObjStats = self.Results.SkyObjects[self.currentObjID].stats
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| 265 |
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| 266 | z1 = ObjStats['Z1']
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| 267 | z2 = ObjStats['Z2']
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| 268 |
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| 269 | zspace = 10
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| 270 |
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| 271 | zmin = max(0, z1 - zspace)
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| 272 | zmax = min(z2 + zspace, self.lenZ - 1)
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| 273 |
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| 274 | zrange = arange(zmin, zmax + 1)
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| 275 |
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| 276 | if self.spectralType == 'max':
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| 277 |
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| 278 | x_peak = ObjStats['X_peak']
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| 279 | y_peak = ObjStats['Y_peak']
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| 280 |
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| 281 | flux = self.realCube[zrange, y_peak, x_peak]
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| 282 |
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| 283 | self.intensityUnit = 'Jy/beam'
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| 284 | self.ax.set_ylabel('Intensity (%s)'%self.intensityUnit)
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| 285 |
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| 286 | elif self.spectralType == 'sum':
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| 287 |
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| 288 | flux = zeros(zrange.shape)
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| 289 |
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| 290 | x1 = ObjStats['X1']
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| 291 | x2 = ObjStats['X2']
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| 292 | y1 = ObjStats['Y1']
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| 293 | y2 = ObjStats['Y2']
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| 294 |
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| 295 | for x in range(x1, x2 + 1):
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| 296 | for y in range(y1, y2 + 1):
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| 297 |
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| 298 | if self.maskImage[y][x] == self.currentObjID:
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| 299 |
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| 300 | flux += self.realCube[zrange, y, x]
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| 301 |
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| 302 |
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| 303 | flux = self.C*flux
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| 304 | self.intensityUnit = 'Jy'
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| 305 | self.ax.set_ylabel('Intensity (%s)'%self.intensityUnit)
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| 306 |
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| 307 | self.linef1 = self.ax.axvline(x = z1, color = "g", linestyle = "--")
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| 308 | self.linef2 = self.ax.axvline(x = z2, color = "g", linestyle = "--")
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| 309 |
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| 310 |
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| 311 |
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| 312 | self.minflux = flux[0]
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| 313 | self.maxflux = flux[0]
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| 314 |
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| 315 | for i in range(len(flux)):
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| 316 |
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| 317 | if zrange[i] >= self.Results.zf1 and zrange[i] <= self.Results.zf2:
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| 318 | pass
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| 319 | else:
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| 320 |
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| 321 | if flux[i] < self.minflux:
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| 322 | self.minflux = flux[i]
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| 323 |
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| 324 | if flux[i] > self.maxflux:
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| 325 | self.maxflux = flux[i]
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| 326 |
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| 327 | self.fluxrange = self.maxflux - self.minflux
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| 328 | self.fluxstep = 0.1*self.fluxrange
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| 329 | self.fluxbottom = self.minflux - self.fluxstep
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| 330 | self.fluxtop = self.maxflux + self.fluxstep
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| 331 | self.fluxsteps = arange(self.fluxbottom, self.fluxtop, self.fluxstep)
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| 332 |
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| 333 | self.ax.plot(zrange, flux)
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| 334 | self.ax.set_xlim(zmin, zmax)
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| 335 |
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| 336 | if self.zAxis == 'freq':
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| 337 |
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| 338 | self.ax.set_xlabel('Frequency Channels (Channel Number)')
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| 339 | else:
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| 340 |
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| 341 | xticks = self.ax.get_xticks()
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| 342 |
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| 343 | velticklabels = []
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| 344 | for xtick in xticks:
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| 345 |
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| 346 | if xtick >= 0 and xtick < self.lenZ:
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| 347 |
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| 348 | velticklabel = velticklabel = '%4.0f'%(self.vel[int(xtick)]/1000)
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| 349 |
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| 350 | velticklabels += [velticklabel]
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| 351 |
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| 352 | self.ax.set_xticklabels(velticklabels)
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| 353 | self.ax.set_xlabel('Velocity (%s%s)'%('k',self.velunit))
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| 354 |
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| 355 | self.ax.set_ylim(self.fluxbottom, self.fluxtop)
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| 356 | self.spectralTitle.set_text("Source " + str(self.currentObjID))
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| 357 | self.draw() |
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