1 | from Numeric import array, Float, ravel, zeros |
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2 | from Scientific.IO.NetCDF import NetCDFFile |
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3 | from Tkinter import Button, E, W |
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4 | from visualiser import Visualiser |
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5 | from vtk import vtkCellArray, vtkPoints, vtkPolyData |
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6 | |
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7 | class OfflineVisualiser(Visualiser): |
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8 | """A VTK-powered offline visualiser which runs in its own thread. |
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9 | In addition to the functions provided by the standard visualiser, |
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10 | the following additional functions are provided: |
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11 | |
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12 | precache_height_quantities() - Precache all the vtkpoints |
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13 | structures for any dynamic height based quantities to render. |
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14 | """ |
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15 | def __init__(self, source): |
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16 | """The source parameter is assumed to be a NetCDF sww file. |
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17 | """ |
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18 | Visualiser.__init__(self, source) |
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19 | |
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20 | self.frameNumber = 0 |
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21 | fin = NetCDFFile(self.source, 'r') |
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22 | self.maxFrameNumber = fin.variables['time'].shape[0] - 1 |
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23 | fin.close() |
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24 | |
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25 | self.vtk_heightQuantityCache = [] |
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26 | for i in range(self.maxFrameNumber + 1): # maxFrameNumber is zero indexed. |
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27 | self.vtk_heightQuantityCache.append({}) |
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28 | |
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29 | self.paused = False |
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30 | self.tk_root.after(100, self.animateForward) |
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31 | |
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32 | def setup_grid(self): |
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33 | fin = NetCDFFile(self.source, 'r') |
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34 | self.vtk_cells = vtkCellArray() |
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35 | N_tri = fin.variables['volumes'].shape[0] |
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36 | for v in range(N_tri): |
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37 | self.vtk_cells.InsertNextCell(3) |
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38 | for i in range(3): |
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39 | self.vtk_cells.InsertCellPoint(fin.variables['volumes'][v][i]) |
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40 | fin.close() |
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41 | |
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42 | def update_height_quantity(self, quantityName, dynamic=True): |
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43 | polydata = self.vtk_polyData[quantityName] = vtkPolyData() |
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44 | if dynamic is True: |
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45 | if not self.vtk_heightQuantityCache[self.frameNumber].has_key(quantityName): |
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46 | self.vtk_heightQuantityCache[self.frameNumber][quantityName]\ |
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47 | = self.read_height_quantity(quantityName, True, self.frameNumber); |
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48 | polydata.SetPoints(self.vtk_heightQuantityCache[self.frameNumber][quantityName]) |
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49 | else: |
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50 | polydata.SetPoints(self.read_height_quantity(quantityName, False)) |
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51 | polydata.SetPolys(self.vtk_cells) |
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52 | |
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53 | def read_height_quantity(self, quantityName, dynamic=True, frameNumber=0): |
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54 | """Read in a height based quantity from the NetCDF source file |
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55 | and return a vtkPoints object. frameNumber is ignored if |
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56 | dynamic is false.""" |
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57 | fin = NetCDFFile(self.source, 'r') |
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58 | points = vtkPoints() |
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59 | if dynamic is True: |
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60 | N_vert = fin.variables[quantityName].shape[1] |
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61 | else: |
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62 | N_vert = len(fin.variables[quantityName]) |
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63 | x = ravel(array(fin.variables['x'], Float)) |
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64 | y = ravel(array(fin.variables['y'], Float)) |
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65 | if dynamic is True: |
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66 | q = array(fin.variables[quantityName][frameNumber], Float) |
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67 | else: |
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68 | q = ravel(array(fin.variables[quantityName], Float)) |
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69 | |
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70 | q *= self.height_zScales[quantityName] |
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71 | q += self.height_offset[quantityName] |
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72 | |
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73 | for v in range(N_vert): |
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74 | points.InsertNextPoint(x[v], y[v], q[v]) |
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75 | fin.close() |
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76 | return points |
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77 | |
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78 | def precache_height_quantities(self): |
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79 | """Precache any height-based quantities. Call before rendering |
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80 | beigns.""" |
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81 | for q in self.height_quantities: |
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82 | if self.height_dynamic[q] is True: |
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83 | print 'Precaching %s' % q |
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84 | for i in range(self.maxFrameNumber + 1): # maxFrameNumber is zero-indexed |
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85 | print ' - Frame %d of %d' % (i, self.maxFrameNumber) |
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86 | self.vtk_heightQuantityCache[i][q]\ |
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87 | = self.read_height_quantity(q, True, i) |
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88 | |
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89 | def build_quantity_dict(self): |
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90 | quantities = {} |
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91 | fin = NetCDFFile(self.source, 'r') |
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92 | for q in filter(lambda n:n != 'x' and n != 'y' and n != 'z' and n != 'time' and n != 'volumes', fin.variables.keys()): |
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93 | if len(fin.variables[q].shape) == 1: # Not a time-varying quantity |
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94 | quantities[q] = ravel(array(fin.variables[q], Float)) |
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95 | else: # Time-varying, get the current timestep data |
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96 | quantities[q] = array(fin.variables[q][self.frameNumber], Float) |
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97 | fin.close() |
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98 | return quantities |
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99 | |
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100 | def setup_gui(self): |
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101 | Visualiser.setup_gui(self) |
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102 | self.tk_quit.grid(row=0, column=0, columnspan=6, sticky=W+E) |
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103 | self.tk_restart = Button(self.tk_controlFrame, text="<<<", command=self.restart) |
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104 | self.tk_restart.grid(row=1, column=0, sticky=W+E) |
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105 | self.tk_back10 = Button(self.tk_controlFrame, text="<<", command=self.back10) |
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106 | self.tk_back10.grid(row=1, column=1, sticky=W+E) |
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107 | self.tk_back = Button(self.tk_controlFrame, text="<", command=self.back) |
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108 | self.tk_back.grid(row=1, column=2, sticky=W+E) |
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109 | self.tk_pauseResume = Button(self.tk_controlFrame, text="Pause", command=self.pauseResume) |
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110 | self.tk_pauseResume.grid(row=1, column=3, sticky=W+E) |
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111 | self.tk_forward = Button(self.tk_controlFrame, text=">", command=self.forward) |
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112 | self.tk_forward.grid(row=1, column=4, sticky=W+E) |
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113 | self.tk_forward10 = Button(self.tk_controlFrame, text=">>", command=self.forward10) |
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114 | self.tk_forward10.grid(row=1, column=5, sticky=W+E) |
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115 | |
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116 | # Make the buttons stretch to fill all available space |
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117 | for i in range(6): |
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118 | self.tk_controlFrame.grid_columnconfigure(i, weight=1) |
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119 | |
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120 | def restart(self): |
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121 | self.frameNumber = 0 |
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122 | self.redraw_quantities(True) |
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123 | |
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124 | def back10(self): |
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125 | if self.frameNumber - 10 >= 0: |
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126 | self.frameNumber -= 10 |
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127 | else: |
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128 | self.frameNumber = 0 |
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129 | self.redraw_quantities(True) |
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130 | |
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131 | def back(self): |
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132 | if self.frameNumber > 0: |
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133 | self.frameNumber -= 1 |
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134 | self.redraw_quantities(True) |
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135 | |
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136 | def pauseResume(self): |
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137 | if self.paused is True: |
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138 | self.tk_pauseResume.config(text="Pause") |
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139 | self.paused = False |
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140 | self.tk_root.after(100, self.animateForward) |
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141 | else: |
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142 | self.tk_pauseResume.config(text="Resume") |
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143 | self.paused = True |
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144 | |
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145 | def forward(self): |
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146 | if self.frameNumber < self.maxFrameNumber: |
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147 | self.frameNumber += 1 |
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148 | self.redraw_quantities(True) |
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149 | |
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150 | def forward10(self): |
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151 | if self.frameNumber + 10 <= self.maxFrameNumber: |
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152 | self.frameNumber += 10 |
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153 | else: |
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154 | self.frameNumber = self.maxFrameNumber |
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155 | self.redraw_quantities(True) |
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156 | |
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157 | def animateForward(self): |
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158 | if self.paused is not True: |
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159 | self.forward() |
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160 | self.tk_root.after(100, self.animateForward) |
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