107 lines
3.1 KiB
Python
107 lines
3.1 KiB
Python
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class BlitManager(object):
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"""Object that manages blits on an axes"""
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def __init__(self, ax):
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self.ax = ax
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self.canvas = ax.figure.canvas
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self.canvas.mpl_connect('draw_event', self.on_draw_event)
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self.ax = ax
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self.background = None
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self.artists = []
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def add_artists(self, artists):
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self.artists.extend(artists)
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self.redraw()
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def remove_artists(self, artists):
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for artist in artists:
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self.artists.remove(artist)
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def on_draw_event(self, event=None):
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self.background = self.canvas.copy_from_bbox(self.ax.bbox)
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self.draw_artists()
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def redraw(self):
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if self.background is not None:
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self.canvas.restore_region(self.background)
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self.draw_artists()
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self.canvas.blit(self.ax.bbox)
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else:
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self.canvas.draw_idle()
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def draw_artists(self):
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for artist in self.artists:
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self.ax.draw_artist(artist)
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class EventManager(object):
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"""Object that manages events on a canvas"""
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def __init__(self, ax):
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self.canvas = ax.figure.canvas
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self.connect_event('button_press_event', self.on_mouse_press)
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self.connect_event('key_press_event', self.on_key_press)
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self.connect_event('button_release_event', self.on_mouse_release)
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self.connect_event('motion_notify_event', self.on_move)
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self.connect_event('scroll_event', self.on_scroll)
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self.tools = []
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self.active_tool = None
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def connect_event(self, name, handler):
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self.canvas.mpl_connect(name, handler)
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def attach(self, tool):
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self.tools.append(tool)
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self.active_tool = tool
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def detach(self, tool):
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self.tools.remove(tool)
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if self.tools:
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self.active_tool = self.tools[-1]
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else:
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self.active_tool = None
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def on_mouse_press(self, event):
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for tool in self.tools:
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if not tool.ignore(event) and tool.hit_test(event):
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self.active_tool = tool
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break
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if self.active_tool and not self.active_tool.ignore(event):
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self.active_tool.on_mouse_press(event)
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return
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for tool in reversed(self.tools):
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if not tool.ignore(event):
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self.active_tool = tool
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tool.on_mouse_press(event)
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return
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def on_key_press(self, event):
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tool = self._get_tool(event)
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if tool is not None:
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tool.on_key_press(event)
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def _get_tool(self, event):
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if not self.tools or self.active_tool.ignore(event):
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return None
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return self.active_tool
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def on_mouse_release(self, event):
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tool = self._get_tool(event)
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if tool is not None:
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tool.on_mouse_release(event)
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def on_move(self, event):
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tool = self._get_tool(event)
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if tool is not None:
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tool.on_move(event)
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def on_scroll(self, event):
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tool = self._get_tool(event)
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if tool is not None:
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tool.on_scroll(event)
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