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Draw overlapping line plots (Bessel functions)
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Draws overlapping line plots with legends. Some are drawn as lines,
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Left-drag pans the plot.
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Right-drag (in the Y direction) zooms the plot in and out.
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Mousewheel up and down zooms the plot in and out.
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Pressing "z" brings up the Zoom Box, and you can click-drag a rectangular
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Right-drag on the legend allows you to reposition it.
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# Major library imports
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from numpy import arange
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from scipy.special import jn
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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 Float, HasTraits, Int, Instance
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from traitsui.api import Item, Group, View
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from chaco.api import create_line_plot, add_default_axes, add_default_grids, \
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OverlayPlotContainer, PlotLabel, create_scatter_plot, Legend
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from chaco.tools.api import PanTool, ZoomTool, LegendTool, TraitsTool, DragZoom
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from chaco.example_support import COLOR_PALETTE
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class OverlappingPlotContainer(OverlayPlotContainer):
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"""Simple container for creating a series of plots"""
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def __init__(self, *args, **kws):
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super(OverlayPlotContainer, self).__init__(*args, **kws)
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def _setup_plots(self):
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"""Creates series of Bessel function plots"""
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x = arange(self.low, self.high + 0.001,
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(self.high - self.low) / self.numpoints)
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for i in range(self.num_funs):
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plot = create_line_plot((x, y),
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color=tuple(COLOR_PALETTE[i]),
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plot = create_scatter_plot((x, y),
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color=tuple(COLOR_PALETTE[i]))
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value_mapper, index_mapper, legend = \
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self._setup_plot_tools(plot)
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self._setup_mapper(plot, value_mapper, index_mapper)
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plots["Bessel j_%d" % i] = plot
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# Set the list of plots on the legend
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# Add the title at the top
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self.overlays.append(PlotLabel("Bessel functions",
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overlay_position="top"))
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# Add the traits inspector tool to the container
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self.tools.append(TraitsTool(self))
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def _setup_plot_tools(self, plot):
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"""Sets up the background, and several tools on a plot"""
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# Make a white background with grids and axes
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plot.bgcolor = "white"
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add_default_grids(plot)
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add_default_axes(plot)
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# Allow white space around plot
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plot.index_range.tight_bounds = False
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plot.index_range.refresh()
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plot.value_range.tight_bounds = False
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plot.value_range.refresh()
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# The PanTool allows panning around the plot
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plot.tools.append(PanTool(plot))
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# The ZoomTool tool is stateful and allows drawing a zoom
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# box to select a zoom region.
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zoom = ZoomTool(plot, tool_mode="box", always_on=False)
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plot.overlays.append(zoom)
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# The DragZoom tool just zooms in and out as the user drags
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# the mouse vertically.
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dragzoom = DragZoom(plot, drag_button="right")
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plot.tools.append(dragzoom)
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# Add a legend in the upper right corner, and make it relocatable
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legend = Legend(component=plot, padding=10, align="ur")
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legend.tools.append(LegendTool(legend, drag_button="right"))
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plot.overlays.append(legend)
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return plot.value_mapper, plot.index_mapper, legend
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def _setup_mapper(self, plot, value_mapper, index_mapper):
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"""Sets up a mapper for given plot"""
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plot.value_mapper = value_mapper
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value_mapper.range.add(plot.value)
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plot.index_mapper = index_mapper
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index_mapper.range.add(plot.index)
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title = "Simple Line Plot"
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class PlotExample(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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width=size[0], height=size[1]
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def _plot_default(self):
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return OverlappingPlotContainer(padding=50, fill_padding=True,
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bgcolor="lightgray", use_backbuffer=True)
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if __name__ == "__main__":
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demo.configure_traits()
added
removed
examples/demo/simple_line.py
