Improved matplotlib backend and plotting.

* Set background to white. I tried transparent, but white looked
  better.
* Fixed dark style sheet for rich text widget.

IPython/frontend/qt/console/ipython_widget.py

@@ -1,275 +1,275 b''
 # Standard library imports
 from subprocess import Popen
 
 # System library imports
 from PyQt4 import QtCore, QtGui
 
 # Local imports
 from IPython.core.inputsplitter import IPythonInputSplitter
 from IPython.core.usage import default_banner
 from frontend_widget import FrontendWidget
 
 
 class IPythonPromptBlock(object):
     """ An internal storage object for IPythonWidget.
     """
     def __init__(self, block, length, number):
         self.block = block
         self.length = length
         self.number = number
 
 
 class IPythonWidget(FrontendWidget):
     """ A FrontendWidget for an IPython kernel.
     """
 
     # Signal emitted when an editor is needed for a file and the editor has been
     # specified as 'custom'.
     custom_edit_requested = QtCore.pyqtSignal(object)
 
     # The default stylesheet: black text on a white background.
     default_stylesheet = """
         .error { color: red; }
         .in-prompt { color: navy; }
         .in-prompt-number { font-weight: bold; }
         .out-prompt { color: darkred; }
         .out-prompt-number { font-weight: bold; }
     """
 
     # A dark stylesheet: white text on a black background.
     dark_stylesheet = """
         QPlainTextEdit { background-color: black; color: white }
         QFrame { border: 1px solid grey; }
         .error { color: red; }
         .in-prompt { color: lime; }
         .in-prompt-number { color: lime; font-weight: bold; }
         .out-prompt { color: red; }
         .out-prompt-number { color: red; font-weight: bold; }
     """
 
     # Default prompts.
     in_prompt = 'In [<span class="in-prompt-number">%i</span>]: '
     out_prompt = 'Out[<span class="out-prompt-number">%i</span>]: '
 
     # FrontendWidget protected class attributes.
     #_input_splitter_class = IPythonInputSplitter
 
     #---------------------------------------------------------------------------
     # 'object' interface
     #---------------------------------------------------------------------------
     
     def __init__(self, *args, **kw):
         super(IPythonWidget, self).__init__(*args, **kw)
 
         # IPythonWidget protected variables.
         self._previous_prompt_obj = None
 
         # Set a default editor and stylesheet.
         self.set_editor('default')
         self.reset_styling()
 
     #---------------------------------------------------------------------------
     # 'BaseFrontendMixin' abstract interface
     #---------------------------------------------------------------------------
 
     def _handle_pyout(self, msg):
         """ Reimplemented for IPython-style "display hook".
         """
         content = msg['content']
         prompt_number = content['prompt_number']
         self._append_plain_text(content['output_sep'])
         self._append_html(self._make_out_prompt(prompt_number))
         self._append_plain_text(content['data'] + '\n' + content['output_sep2'])
 
     #---------------------------------------------------------------------------
     # 'FrontendWidget' interface
     #---------------------------------------------------------------------------
 
     def execute_file(self, path, hidden=False):
         """ Reimplemented to use the 'run' magic.
         """
         self.execute('run %s' % path, hidden=hidden)
 
     #---------------------------------------------------------------------------
     # 'FrontendWidget' protected interface
     #---------------------------------------------------------------------------
 
     def _get_banner(self):
         """ Reimplemented to return IPython's default banner.
         """
         return default_banner + '\n'
 
     def _process_execute_error(self, msg):
         """ Reimplemented for IPython-style traceback formatting.
         """
         content = msg['content']
         traceback_lines = content['traceback'][:]
         traceback = ''.join(traceback_lines)
         traceback = traceback.replace(' ', '&nbsp;')
         traceback = traceback.replace('\n', '<br/>')
 
         ename = content['ename']
         ename_styled = '<span class="error">%s</span>' % ename
         traceback = traceback.replace(ename, ename_styled)
 
         self._append_html(traceback)
 
     def _show_interpreter_prompt(self, number=None, input_sep='\n'):
         """ Reimplemented for IPython-style prompts.
         """
         # TODO: If a number was not specified, make a prompt number request.
         if number is None:
             number = 0
 
         # Show a new prompt and save information about it so that it can be
         # updated later if the prompt number turns out to be wrong.
         self._append_plain_text(input_sep)
         self._show_prompt(self._make_in_prompt(number), html=True)
         block = self._control.document().lastBlock()
         length = len(self._prompt)
         self._previous_prompt_obj = IPythonPromptBlock(block, length, number)
 
         # Update continuation prompt to reflect (possibly) new prompt length.
         self._set_continuation_prompt(
             self._make_continuation_prompt(self._prompt), html=True)
 
     def _show_interpreter_prompt_for_reply(self, msg):
         """ Reimplemented for IPython-style prompts.
         """
         # Update the old prompt number if necessary.
         content = msg['content']
         previous_prompt_number = content['prompt_number']
         if self._previous_prompt_obj and \
                 self._previous_prompt_obj.number != previous_prompt_number:
             block = self._previous_prompt_obj.block
             if block.isValid():
 
                 # Remove the old prompt and insert a new prompt.
                 cursor = QtGui.QTextCursor(block)
                 cursor.movePosition(QtGui.QTextCursor.Right,
                                     QtGui.QTextCursor.KeepAnchor, 
                                     self._previous_prompt_obj.length)
                 prompt = self._make_in_prompt(previous_prompt_number)
                 self._prompt = self._insert_html_fetching_plain_text(
                     cursor, prompt)
 
                 # XXX: When the HTML is inserted, Qt blows away the syntax
                 #      highlighting for the line. I cannot for the life of me
                 #      determine how to preserve the existing formatting.
                 self._highlighter.highlighting_on = True
                 self._highlighter.rehighlightBlock(cursor.block())
                 self._highlighter.highlighting_on = False
 
             self._previous_prompt_obj = None
 
         # Show a new prompt with the kernel's estimated prompt number.
         next_prompt = content['next_prompt']
         self._show_interpreter_prompt(next_prompt['prompt_number'], 
                                       next_prompt['input_sep'])
 
     #---------------------------------------------------------------------------
     # 'IPythonWidget' interface
     #---------------------------------------------------------------------------
 
     def edit(self, filename):
         """ Opens a Python script for editing.
 
         Parameters:
         -----------
         filename : str
             A path to a local system file.
         
         Raises:
         -------
         OSError
             If the editor command cannot be executed.
         """
         if self._editor == 'default':
             url = QtCore.QUrl.fromLocalFile(filename)
             if not QtGui.QDesktopServices.openUrl(url):
                 message = 'Failed to open %s with the default application'
                 raise OSError(message % repr(filename))
         elif self._editor is None:
             self.custom_edit_requested.emit(filename)
         else:
             Popen(self._editor + [filename])
 
     def reset_styling(self):
         """ Restores the default IPythonWidget styling.
         """
         self.set_styling(self.default_stylesheet, syntax_style='default')
-        #self.set_styling(self.dark_stylesheet, syntax_style='monokai')
+        # self.set_styling(self.dark_stylesheet, syntax_style='monokai')
 
     def set_editor(self, editor):
         """ Sets the editor to use with the %edit magic.
 
         Parameters:
         -----------
         editor : str or sequence of str
             A command suitable for use with Popen. This command will be executed
             with a single argument--a filename--when editing is requested.
 
             This parameter also takes two special values:
                 'default' : Files will be edited with the system default 
                             application for Python files.
                 'custom'  : Emit a 'custom_edit_requested(str)' signal instead
                             of opening an editor.
         """
         if editor == 'default':
             self._editor = 'default'
         elif editor == 'custom':
             self._editor = None
         elif isinstance(editor, basestring):
             self._editor = [ editor ]
         else:
             self._editor = list(editor)
 
     def set_styling(self, stylesheet, syntax_style=None):
         """ Sets the IPythonWidget styling.
 
         Parameters:
         -----------
         stylesheet : str
             A CSS stylesheet. The stylesheet can contain classes for:
                 1. Qt: QPlainTextEdit, QFrame, QWidget, etc
                 2. Pygments: .c, .k, .o, etc (see PygmentsHighlighter)
                 3. IPython: .error, .in-prompt, .out-prompt, etc.
 
         syntax_style : str or None [default None]
             If specified, use the Pygments style with given name. Otherwise, 
             the stylesheet is queried for Pygments style information.
         """
         self.setStyleSheet(stylesheet)
         self._control.document().setDefaultStyleSheet(stylesheet)
         if self._page_control:
             self._page_control.document().setDefaultStyleSheet(stylesheet)
 
         if syntax_style is None:
             self._highlighter.set_style_sheet(stylesheet)
         else:
             self._highlighter.set_style(syntax_style)
 
     #---------------------------------------------------------------------------
     # 'IPythonWidget' protected interface
     #---------------------------------------------------------------------------
 
     def _make_in_prompt(self, number):
         """ Given a prompt number, returns an HTML In prompt.
         """
         body = self.in_prompt % number
         return '<span class="in-prompt">%s</span>' % body
 
     def _make_continuation_prompt(self, prompt):
         """ Given a plain text version of an In prompt, returns an HTML
             continuation prompt.
         """
         end_chars = '...: '
         space_count = len(prompt.lstrip('\n')) - len(end_chars)
         body = '&nbsp;' * space_count + end_chars
         return '<span class="in-prompt">%s</span>' % body
         
     def _make_out_prompt(self, number):
         """ Given a prompt number, returns an HTML Out prompt.
         """
         body = self.out_prompt % number
         return '<span class="out-prompt">%s</span>' % body

IPython/frontend/qt/console/rich_ipython_widget.py

@@ -1,127 +1,138 b''
 # System library imports
 from PyQt4 import QtCore, QtGui
 
 # Local imports
 from IPython.frontend.qt.svg import save_svg, svg_to_clipboard, svg_to_image
 from ipython_widget import IPythonWidget
 
 
 class RichIPythonWidget(IPythonWidget):
     """ An IPythonWidget that supports rich text, including lists, images, and
         tables. Note that raw performance will be reduced compared to the plain
         text version.
     """
 
     # Protected class variables.
     _svg_text_format_property = 1
 
+    # We need to override this because this class uses QTextEdit.
+    dark_stylesheet = """
+        QTextEdit { background-color: black; color: white }
+        QFrame { border: 1px solid grey; }
+        .error { color: red; }
+        .in-prompt { color: lime; }
+        .in-prompt-number { color: lime; font-weight: bold; }
+        .out-prompt { color: red; }
+        .out-prompt-number { color: red; font-weight: bold; }
+    """
+
     #---------------------------------------------------------------------------
     # 'object' interface
     #---------------------------------------------------------------------------
 
     def __init__(self, *args, **kw):
         """ Create a RichIPythonWidget.
         """
         kw['kind'] = 'rich'
         super(RichIPythonWidget, self).__init__(*args, **kw)
 
     #---------------------------------------------------------------------------
     # 'ConsoleWidget' protected interface
     #---------------------------------------------------------------------------
 
     def _show_context_menu(self, pos):
         """ Reimplemented to show a custom context menu for images.
         """
         format = self._control.cursorForPosition(pos).charFormat()
         name = format.stringProperty(QtGui.QTextFormat.ImageName)
         if name.isEmpty():
             super(RichIPythonWidget, self)._show_context_menu(pos)
         else:
             menu = QtGui.QMenu()
 
             menu.addAction('Copy Image', lambda: self._copy_image(name))
             menu.addAction('Save Image As...', lambda: self._save_image(name))
             menu.addSeparator()
 
             svg = format.stringProperty(self._svg_text_format_property)
             if not svg.isEmpty():
                 menu.addSeparator()
                 menu.addAction('Copy SVG', lambda: svg_to_clipboard(svg))
                 menu.addAction('Save SVG As...', 
                                lambda: save_svg(svg, self._control))
                 
             menu.exec_(self._control.mapToGlobal(pos))
     
     #---------------------------------------------------------------------------
     # 'FrontendWidget' protected interface
     #---------------------------------------------------------------------------
 
     def _process_execute_ok(self, msg):
         """ Reimplemented to handle matplotlib plot payloads.
         """
         payload = msg['content']['payload']
         for item in payload:
             if item['type'] == 'plot':
                 if item['format'] == 'svg':
                     svg = item['data']
                     try:
                         image = svg_to_image(svg)
                     except ValueError:
                         self._append_plain_text('Received invalid plot data.')
                     else:
                         format = self._add_image(image)
                         format.setProperty(self._svg_text_format_property, svg)
                         cursor = self._get_end_cursor()
                         cursor.insertBlock()
                         cursor.insertImage(format)
                         cursor.insertBlock()
                 else:
                     # Add other plot formats here!
                     pass
             else:
                 # Add other payload types here!
                 pass
         else:
             super(RichIPythonWidget, self)._process_execute_ok(msg)
 
     #---------------------------------------------------------------------------
     # 'RichIPythonWidget' protected interface
     #---------------------------------------------------------------------------
 
     def _add_image(self, image):
         """ Adds the specified QImage to the document and returns a
             QTextImageFormat that references it.
         """
         document = self._control.document()
         name = QtCore.QString.number(image.cacheKey())
         document.addResource(QtGui.QTextDocument.ImageResource,
                              QtCore.QUrl(name), image)
         format = QtGui.QTextImageFormat()
         format.setName(name)
         return format
 
     def _copy_image(self, name):
         """ Copies the ImageResource with 'name' to the clipboard.
         """
         image = self._get_image(name)
         QtGui.QApplication.clipboard().setImage(image)
 
     def _get_image(self, name):
         """ Returns the QImage stored as the ImageResource with 'name'.
         """
         document = self._control.document()
         variant = document.resource(QtGui.QTextDocument.ImageResource,
                                     QtCore.QUrl(name))
         return variant.toPyObject()
 
     def _save_image(self, name, format='PNG'):
         """ Shows a save dialog for the ImageResource with 'name'.
         """
         dialog = QtGui.QFileDialog(self._control, 'Save Image')
         dialog.setAcceptMode(QtGui.QFileDialog.AcceptSave)
         dialog.setDefaultSuffix(format.lower())
         dialog.setNameFilter('%s file (*.%s)' % (format, format.lower()))
         if dialog.exec_():
             filename = dialog.selectedFiles()[0]
             image = self._get_image(name)
             image.save(filename, format)

IPython/zmq/pylab/backend_payload_svg.py

@@ -1,25 +1,30 b''
 # Standard library imports
 from cStringIO import StringIO
 
 # System library imports.
 from matplotlib.backends.backend_svg import new_figure_manager
 from matplotlib._pylab_helpers import Gcf
 
 # Local imports.
 from backend_payload import add_plot_payload
 
 
 def show():
     """ Deliver a SVG payload.
     """
     figure_manager = Gcf.get_active()
     if figure_manager is not None:
+        # Make the background transparent.
+        # figure_manager.canvas.figure.patch.set_alpha(0.0)
+        # Set the background to white instead so it looks good on black.
+        figure_manager.canvas.figure.set_facecolor('white')
+        figure_manager.canvas.figure.set_edgecolor('white')
         data = svg_from_canvas(figure_manager.canvas)
         add_plot_payload('svg', data)
 
 def svg_from_canvas(canvas):
     """ Return a string containing the SVG representation of a FigureCanvasSvg.
     """
     string_io = StringIO()
     canvas.print_svg(string_io)
     return string_io.getvalue()