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1 | 1 | """Produce SVG versions of active plots for display by the rich Qt frontend. |
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2 | 2 | """ |
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3 | 3 | #----------------------------------------------------------------------------- |
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4 | 4 | # Imports |
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5 | 5 | #----------------------------------------------------------------------------- |
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6 | 6 | from __future__ import print_function |
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7 | 7 | |
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8 | 8 | # Standard library imports |
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9 | 9 | import sys |
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10 | 10 | |
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11 | 11 | # Third-party imports |
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12 | 12 | import matplotlib |
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13 | 13 | from matplotlib.backends.backend_agg import new_figure_manager |
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14 | 14 | from matplotlib._pylab_helpers import Gcf |
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15 | 15 | |
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16 | 16 | # Local imports. |
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17 | 17 | from IPython.config.configurable import SingletonConfigurable |
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18 | 18 | from IPython.core.displaypub import publish_display_data |
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19 | 19 | from IPython.core.pylabtools import print_figure, select_figure_format |
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20 | 20 | from IPython.utils.traitlets import Dict, Instance, CaselessStrEnum, CBool |
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21 | 21 | from IPython.utils.warn import warn |
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22 | 22 | |
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23 | 23 | #----------------------------------------------------------------------------- |
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24 | 24 | # Configurable for inline backend options |
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25 | 25 | #----------------------------------------------------------------------------- |
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26 | 26 | # inherit from InlineBackendConfig for deprecation purposes |
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27 | 27 | class InlineBackendConfig(SingletonConfigurable): |
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28 | 28 | pass |
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29 | 29 | |
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30 | 30 | class InlineBackend(InlineBackendConfig): |
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31 | 31 | """An object to store configuration of the inline backend.""" |
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32 | 32 | |
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33 | 33 | def _config_changed(self, name, old, new): |
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34 | 34 | # warn on change of renamed config section |
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35 | 35 | if new.InlineBackendConfig != old.InlineBackendConfig: |
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36 | 36 | warn("InlineBackendConfig has been renamed to InlineBackend") |
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37 | 37 | super(InlineBackend, self)._config_changed(name, old, new) |
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38 | 38 | |
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39 | 39 | # The typical default figure size is too large for inline use, |
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40 | 40 | # so we shrink the figure size to 6x4, and tweak fonts to |
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41 | 41 | # make that fit. |
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42 | 42 | rc = Dict({'figure.figsize': (6.0,4.0), |
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43 | 43 | # 12pt labels get cutoff on 6x4 logplots, so use 10pt. |
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44 | 44 | 'font.size': 10, |
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45 | 45 | # 72 dpi matches SVG/qtconsole |
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46 | 46 | # this only affects PNG export, as SVG has no dpi setting |
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47 | 47 | 'savefig.dpi': 72, |
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48 | 48 | # 10pt still needs a little more room on the xlabel: |
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49 | 49 | 'figure.subplot.bottom' : .125 |
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50 | 50 | }, config=True, |
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51 | 51 | help="""Subset of matplotlib rcParams that should be different for the |
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52 | 52 | inline backend.""" |
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53 | 53 | ) |
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54 | 54 | |
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55 | 55 | figure_format = CaselessStrEnum(['svg', 'png'], default_value='png', config=True, |
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56 | 56 | help="The image format for figures with the inline backend.") |
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57 | 57 | |
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58 | 58 | def _figure_format_changed(self, name, old, new): |
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59 | 59 | if self.shell is None: |
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60 | 60 | return |
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61 | 61 | else: |
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62 | 62 | select_figure_format(self.shell, new) |
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63 | 63 | |
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64 | 64 | close_figures = CBool(True, config=True, |
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65 | 65 | help="""Close all figures at the end of each cell. |
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66 | 66 | |
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67 | 67 | When True, ensures that each cell starts with no active figures, but it |
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68 | 68 | also means that one must keep track of references in order to edit or |
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69 | 69 | redraw figures in subsequent cells. This mode is ideal for the notebook, |
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70 | 70 | where residual plots from other cells might be surprising. |
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71 | 71 | |
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72 | 72 | When False, one must call figure() to create new figures. This means |
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73 | 73 | that gcf() and getfigs() can reference figures created in other cells, |
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74 | 74 | and the active figure can continue to be edited with pylab/pyplot |
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75 | 75 | methods that reference the current active figure. This mode facilitates |
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76 | 76 | iterative editing of figures, and behaves most consistently with |
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77 | 77 | other matplotlib backends, but figure barriers between cells must |
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78 | 78 | be explicit. |
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79 | 79 | """) |
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80 | 80 | |
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81 | 81 | shell = Instance('IPython.core.interactiveshell.InteractiveShellABC') |
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82 | 82 | |
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83 | 83 | |
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84 | 84 | #----------------------------------------------------------------------------- |
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85 | 85 | # Functions |
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86 | 86 | #----------------------------------------------------------------------------- |
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87 | 87 | |
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88 | 88 | def show(close=None): |
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89 | 89 | """Show all figures as SVG/PNG payloads sent to the IPython clients. |
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90 | 90 | |
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91 | 91 | Parameters |
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92 | 92 | ---------- |
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93 | 93 | close : bool, optional |
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94 | 94 | If true, a ``plt.close('all')`` call is automatically issued after |
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95 | 95 | sending all the figures. If this is set, the figures will entirely |
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96 | 96 | removed from the internal list of figures. |
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97 | 97 | """ |
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98 | 98 | if close is None: |
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99 | 99 | close = InlineBackend.instance().close_figures |
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100 | 100 | try: |
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101 | 101 | for figure_manager in Gcf.get_all_fig_managers(): |
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102 | 102 | send_figure(figure_manager.canvas.figure) |
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103 | 103 | finally: |
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104 | 104 | show._to_draw = [] |
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105 | 105 | if close: |
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106 | 106 | matplotlib.pyplot.close('all') |
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107 | 107 | |
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108 | 108 | |
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109 | 109 | |
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110 | 110 | # This flag will be reset by draw_if_interactive when called |
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111 | 111 | show._draw_called = False |
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112 | 112 | # list of figures to draw when flush_figures is called |
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113 | 113 | show._to_draw = [] |
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114 | 114 | |
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115 | 115 | |
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116 | 116 | def draw_if_interactive(): |
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117 | 117 | """ |
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118 | 118 | Is called after every pylab drawing command |
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119 | 119 | """ |
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120 | 120 | # signal that the current active figure should be sent at the end of execution. |
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121 | 121 | # Also sets the _draw_called flag, signaling that there will be something to send. |
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122 | 122 | # At the end of the code execution, a separate call to flush_figures() |
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123 | 123 | # will act upon these values |
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124 | 124 | |
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125 | 125 | fig = Gcf.get_active().canvas.figure |
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126 | 126 | |
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127 | 127 | # ensure current figure will be drawn, and each subsequent call |
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128 | 128 | # of draw_if_interactive() moves the active figure to ensure it is |
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129 | 129 | # drawn last |
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130 | 130 | try: |
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131 | 131 | show._to_draw.remove(fig) |
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132 | 132 | except ValueError: |
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133 | 133 | # ensure it only appears in the draw list once |
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134 | 134 | pass |
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135 | 135 | show._to_draw.append(fig) |
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136 | 136 | show._draw_called = True |
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137 | 137 | |
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138 | 138 | def flush_figures(): |
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139 | 139 | """Send all figures that changed |
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140 | 140 | |
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141 | 141 | This is meant to be called automatically and will call show() if, during |
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142 | 142 | prior code execution, there had been any calls to draw_if_interactive. |
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143 | ||
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144 | This function is meant to be used as a post_execute callback in IPython, | |
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145 | so user-caused errors are handled with showtraceback() instead of being | |
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146 | allowed to raise. If this function is not called from within IPython, | |
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147 | then these exceptions will raise. | |
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143 | 148 | """ |
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144 | 149 | if not show._draw_called: |
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145 | 150 | return |
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146 | 151 | |
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147 | 152 | if InlineBackend.instance().close_figures: |
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148 | 153 | # ignore the tracking, just draw and close all figures |
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154 | try: | |
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149 | 155 | return show(True) |
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150 | ||
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156 | except Exception as e: | |
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157 | # safely show traceback if in IPython, else raise | |
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158 | try: | |
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159 | get_ipython().showtraceback() | |
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160 | return | |
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161 | except NameError: | |
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162 | raise e | |
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151 | 163 | try: |
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152 | 164 | # exclude any figures that were closed: |
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153 | 165 | active = set([fm.canvas.figure for fm in Gcf.get_all_fig_managers()]) |
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154 | 166 | for fig in [ fig for fig in show._to_draw if fig in active ]: |
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167 | try: | |
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155 | 168 | send_figure(fig) |
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169 | except Exception as e: | |
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170 | # safely show traceback if in IPython, else raise | |
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171 | try: | |
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172 | get_ipython().showtraceback() | |
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173 | break | |
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174 | except NameError: | |
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175 | raise e | |
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156 | 176 | finally: |
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157 | 177 | # clear flags for next round |
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158 | 178 | show._to_draw = [] |
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159 | 179 | show._draw_called = False |
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160 | 180 | |
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161 | 181 | |
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162 | 182 | def send_figure(fig): |
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163 | 183 | """Draw the current figure and send it as a PNG payload. |
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164 | 184 | """ |
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165 | # For an empty figure, don't even bother calling figure_to_svg, to avoid | |
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166 | # big blank spaces in the qt console | |
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167 | if not fig.axes: | |
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168 | return | |
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169 | 185 | fmt = InlineBackend.instance().figure_format |
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170 | 186 | data = print_figure(fig, fmt) |
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187 | # print_figure will return None if there's nothing to draw: | |
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188 | if data is None: | |
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189 | return | |
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171 | 190 | mimetypes = { 'png' : 'image/png', 'svg' : 'image/svg+xml' } |
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172 | 191 | mime = mimetypes[fmt] |
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173 | 192 | # flush text streams before sending figures, helps a little with output |
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174 | 193 | # synchronization in the console (though it's a bandaid, not a real sln) |
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175 | 194 | sys.stdout.flush(); sys.stderr.flush() |
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176 | 195 | publish_display_data( |
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177 | 196 | 'IPython.zmq.pylab.backend_inline.send_figure', |
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178 | 197 | {mime : data} |
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179 | 198 | ) |
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180 | 199 |
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