"""
Example of how to use a DataView and bare renderers to create plots
"""

from numpy import linspace, sin, cos

# Enthought library imports.
from chaco.api import (
    DataView,
    ArrayDataSource,
    ScatterPlot,
    LinePlot,
    LinearMapper,
)
from chaco.tools.api import PanTool, ZoomTool
from enable.api import Component, ComponentEditor
from traits.api import HasTraits, Instance
from traitsui.api import UItem, View


class PlotExample(HasTraits):
    plot = Instance(Component)

    traits_view = View(
        UItem("plot", editor=ComponentEditor()),
        width=700,
        height=600,
        resizable=True,
        title="Dataview + renderer example",
    )

    def _plot_default(self):
        x = linspace(-5, 10, 500)
        y = sin(x)
        y2 = 0.5 * cos(2 * x)

        view = DataView(border_visible=True)
        scatter = ScatterPlot(
            index=ArrayDataSource(x),
            value=ArrayDataSource(y),
            marker="square",
            color="red",
            outline_color="transparent",
            index_mapper=LinearMapper(range=view.index_range),
            value_mapper=LinearMapper(range=view.value_range),
        )

        line = LinePlot(
            index=scatter.index,
            value=ArrayDataSource(y2),
            color="blue",
            index_mapper=LinearMapper(range=view.index_range),
            value_mapper=LinearMapper(range=view.value_range),
        )

        # Add the plot's index and value datasources to the dataview's
        # ranges so that it can auto-scale and fit appropriately
        view.index_range.sources.append(scatter.index)
        view.value_range.sources.append(scatter.value)
        view.value_range.sources.append(line.value)

        # Add the renderers to the dataview.  The z-order is determined
        # by the order in which renderers are added.
        view.add(scatter)
        view.add(line)
        view.tools.append(PanTool(view))
        view.overlays.append(ZoomTool(view))

        return view


demo = PlotExample()

if __name__ == "__main__":
    demo.configure_traits()