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Shares same basic interactions as polygon_plot.py, but adds a new one:
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- Right click and drag to move a polygon around.
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# Major library imports
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from numpy import transpose
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# Enthought library imports
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from enable.api import Component, ComponentEditor
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from traits.api import HasTraits, Instance, Enum, CArray
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from traitsui.api import Item, Group, View
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from chaco.api import ArrayPlotData, Plot
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from chaco.base import n_gon
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from chaco.tools.api import PanTool, ZoomTool, DragTool
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class DataspaceMoveTool(DragTool):
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Modifies the data values of a plot. Only works on instances
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of BaseXYPlot or its subclasses
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event_state = Enum("normal", "dragging")
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def is_draggable(self, x, y):
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return self.component.hittest((x,y))
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def drag_start(self, event):
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data_pt = self.component.map_data((event.x, event.y), all_values=True)
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self._prev_pt = data_pt
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def dragging(self, event):
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cur_pt = plot.map_data((event.x, event.y), all_values=True)
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dx = cur_pt[0] - self._prev_pt[0]
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dy = cur_pt[1] - self._prev_pt[1]
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index = plot.index.get_data() + dx
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value = plot.value.get_data() + dy
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plot.index.set_data(index, sort_order=plot.index.sort_order)
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plot.value.set_data(value, sort_order=plot.value.sort_order)
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self._prev_pt = cur_pt
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#===============================================================================
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# # Create the Chaco plot.
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#===============================================================================
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def _create_plot_component():
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# Use n_gon to compute center locations for our polygons
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points = n_gon(center=(0,0), r=4, nsides=8)
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# Choose some colors for our polygons
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colors = {3:0xaabbcc, 4:'orange', 5:'yellow', 6:'lightgreen',
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7:'green', 8:'blue', 9:'lavender', 10:'purple'}
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# Create a PlotData object to store the polygon data
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# Create a Polygon Plot to draw the regular polygons
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# Store path data for each polygon, and plot
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npoints = n_gon(center=p, r=2, nsides=nsides)
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nxarray, nyarray = transpose(npoints)
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pd.set_data("x" + str(nsides), nxarray)
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pd.set_data("y" + str(nsides), nyarray)
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plot = polyplot.plot(("x"+str(nsides), "y"+str(nsides)),
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face_color=colors[nsides],
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hittest_type="poly")[0]
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plot.tools.append(DataspaceMoveTool(plot, drag_button="right"))
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# Tweak some of the plot properties
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polyplot.title = "Polygon Plot"
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# Attach some tools to the plot
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polyplot.tools.append(PanTool(polyplot))
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zoom = ZoomTool(polyplot, tool_mode="box", always_on=False)
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polyplot.overlays.append(zoom)
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#===============================================================================
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# Attributes to use for the plot view.
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#===============================================================================
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# # Demo class that is used by the demo.py application.
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#===============================================================================
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class Demo(HasTraits):
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plot = Instance(Component)
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Item('plot', editor=ComponentEditor(size=size),
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orientation = "vertical"),
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resizable=True, title=title
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def _plot_default(self):
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return _create_plot_component()
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if __name__ == "__main__":
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demo.configure_traits()
added
removed
examples/demo/basic/polygon_move.py
