"""
Grid containing plots with fixed aspect ratios

Each plot in this example has a specified aspect ratio which will not
change no matter how the window is resized.
"""

# Major library imports
from numpy import linspace
from scipy.special import jn

# Enthought library imports
from enable.api import Component, ComponentEditor
from traits.api import HasTraits, Instance
from traitsui.api import Item, Group, View

# Chaco imports
from chaco.api import (
    ArrayPlotData, GridContainer, Plot, cbrewer as COLOR_PALETTE,
)
from chaco.tools.api import PanTool, ZoomTool


# ===============================================================================
# # Create the Chaco plot.
# ===============================================================================
def _create_plot_component():
    # Create a GridContainer to hold all of our plots
    container = GridContainer(
        padding=20,
        fill_padding=True,
        bgcolor="lightgray",
        use_backbuffer=True,
        shape=(3, 3),
        spacing=(12, 12),
    )

    # Create the initial series of data
    x = linspace(-5, 15.0, 100)
    pd = ArrayPlotData(index=x)

    # Plot some bessel functions and add the plots to our container
    for i in range(9):
        pd.set_data("y" + str(i), jn(i, x))
        plot = Plot(pd)
        plot.plot(
            ("index", "y" + str(i)),
            color=tuple(COLOR_PALETTE[i]),
            line_width=2.0,
            bgcolor="white",
            border_visible=True,
        )

        # Tweak some of the plot properties
        plot.border_width = 1
        plot.padding = 10

        # Set each plot's aspect ratio based on its position in the
        # 3x3 grid of plots.
        n, m = divmod(i, 3)
        plot.aspect_ratio = float(n + 1) / (m + 1)

        # Attach some tools to the plot
        plot.tools.append(PanTool(plot))
        zoom = ZoomTool(plot, tool_mode="box", always_on=False)
        plot.overlays.append(zoom)

        # Add to the grid container
        container.add(plot)
    return container


# ===============================================================================
# Attributes to use for the plot view.
size = (1000, 800)
title = "Grid Container with Fixed Aspect ratios"

# ===============================================================================
# # Demo class that is used by the demo.py application.
# ===============================================================================
class Demo(HasTraits):
    plot = Instance(Component)

    traits_view = View(
        Group(
            Item("plot", editor=ComponentEditor(size=size), show_label=False),
            orientation="vertical",
        ),
        resizable=True,
        title=title,
    )

    def _plot_default(self):
        return _create_plot_component()


demo = Demo()

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