#!/usr/bin/env python

'''
This little example shows how a cursor can be created in
 image viewers, and renderers.  The standard TkImageViewerWidget and
 TkRenderWidget bindings are used.  There is a new binding:
 middle button in the image viewer sets the position of the cursor.
'''

import sys
from functools import partial
from vtkmodules.vtkCommonDataModel import vtkPiecewiseFunction
from vtkmodules.vtkFiltersGeneral import vtkAxes
from vtkmodules.vtkFiltersModeling import vtkOutlineFilter
from vtkmodules.vtkIOImage import vtkSLCReader
from vtkmodules.vtkImagingCore import vtkImageMagnify
from vtkmodules.vtkImagingHybrid import vtkImageCursor3D
from vtkmodules.vtkInteractionImage import vtkImageViewer
from vtkmodules.vtkRenderingCore import (
    vtkActor,
    vtkColorTransferFunction,
    vtkPolyDataMapper,
    vtkRenderWindow,
    vtkRenderer,
    vtkVolume,
    vtkVolumeProperty,
)
from vtkmodules.vtkRenderingVolume import vtkFixedPointVolumeRayCastMapper
import vtkmodules.vtkRenderingFreeType
import vtkmodules.vtkRenderingOpenGL2
import vtkmodules.vtkRenderingVolumeOpenGL2
from vtkmodules.test import Testing
from vtkmodules.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()

import tkinter
from tkinter import Pack

#from vtk.tk.vtkTkRenderWindowInteractor import vtkTkRenderWindowInteractor
from vtkmodules.tk.vtkTkRenderWidget import vtkTkRenderWidget
from vtkmodules.tk.vtkTkImageViewerWidget import vtkTkImageViewerWidget

# Tkinter constants.
E = tkinter.E
W = tkinter.W
N = tkinter.N
S = tkinter.S
HORIZONTAL = tkinter.HORIZONTAL
VERTICAL = tkinter.VERTICAL
RIGHT = tkinter.RIGHT
LEFT = tkinter.LEFT
TOP = tkinter.TOP
BOTTOM = tkinter.BOTTOM
X = tkinter.X
BOTH = tkinter.BOTH
NO = tkinter.NO
YES = tkinter.YES
NORMAL = tkinter.NORMAL
DISABLED = tkinter.DISABLED
TRUE = tkinter.TRUE
FALSE = tkinter.FALSE

# Global values.
CURSOR_X = 20
CURSOR_Y = 20
CURSOR_Z = 20

IMAGE_MAG_X = 4
IMAGE_MAG_Y = 4
IMAGE_MAG_Z = 1


class Cursor3DViewer(Testing.vtkTest):
    '''
    Provide a testing framework for for cursor3D.

    Note:
        root, the top-level widget for Tk,
        tkrw, the vtkTkRenderWidget and
        tkvw, the vtkTkImageViewerWidget
        are accessible from any function in this class
        after SetUp() has run.
    '''

    def SetUp(self):
        '''
        Set up cursor3D
        '''

        def OnClosing():
            self.root.quit()

        def ViewerDown(tkvw):
            viewer = tkvw.GetImageViewer()
            ViewerSetZSlice(tkvw, viewer.GetZSlice() - 1)

        def ViewerUp(tkvw):
            viewer = tkvw.GetImageViewer()
            ViewerSetZSlice(tkvw, viewer.GetZSlice() + 1)

        def ViewerSetZSlice(tkvw, z):
            viewer = tkvw.GetImageViewer()
            viewer.SetZSlice(z)
            txt = 'slice: ' + str(z)
            sliceLabel.configure(text=txt)
            tkvw.Render()

        def SetCursorFromViewer(event):
            x = int(event.x)
            y = int(event.y)
            # We have to flip y axis because tk uses upper right origin.
            self.root.update_idletasks()
            height = int(self.tkvw.configure()['height'][4])
            y = height - y
            z = self.tkvw.GetImageViewer().GetZSlice()
            SetCursor( x / IMAGE_MAG_X, y / IMAGE_MAG_Y, z / IMAGE_MAG_Z )

        def SetCursor(x, y, z):

            CURSOR_X = x
            CURSOR_Y = y
            CURSOR_Z = z

            axes.SetOrigin(CURSOR_X,CURSOR_Y,CURSOR_Z)
            imageCursor.SetCursorPosition(
                CURSOR_X * IMAGE_MAG_X,
                CURSOR_Y * IMAGE_MAG_Y,
                CURSOR_Z * IMAGE_MAG_Z)

            self.viewer.Render()
            self.tkrw.Render()

        # Pipeline stuff.
        reader = vtkSLCReader()
        reader.SetFileName(VTK_DATA_ROOT + "/Data/neghip.slc")
        # Cursor stuff

        magnify = vtkImageMagnify()
        magnify.SetInputConnection(reader.GetOutputPort())
        magnify.SetMagnificationFactors(IMAGE_MAG_X, IMAGE_MAG_Y ,IMAGE_MAG_Z)

        imageCursor = vtkImageCursor3D()
        imageCursor.SetInputConnection(magnify.GetOutputPort())
        imageCursor.SetCursorPosition(
                CURSOR_X*IMAGE_MAG_X,
                CURSOR_Y*IMAGE_MAG_Y,
                CURSOR_Z*IMAGE_MAG_Z)
        imageCursor.SetCursorValue(255)
        imageCursor.SetCursorRadius(50*IMAGE_MAG_X)

        axes = vtkAxes()
        axes.SymmetricOn()
        axes.SetOrigin(CURSOR_X, CURSOR_Y, CURSOR_Z)
        axes.SetScaleFactor(50.0)

        axes_mapper = vtkPolyDataMapper()
        axes_mapper.SetInputConnection(axes.GetOutputPort())

        axesActor = vtkActor()
        axesActor.SetMapper(axes_mapper)
        axesActor.GetProperty().SetAmbient(0.5)

        # Image viewer stuff.
        viewer = vtkImageViewer()
        viewer.SetInputConnection(imageCursor.GetOutputPort())
        viewer.SetZSlice(CURSOR_Z*IMAGE_MAG_Z)
        viewer.SetColorWindow(256)
        viewer.SetColorLevel(128)

        # Create transfer functions for opacity and color.
        opacity_transfer_function = vtkPiecewiseFunction()
        opacity_transfer_function.AddPoint(20, 0.0)
        opacity_transfer_function.AddPoint(255, 0.2)

        color_transfer_function = vtkColorTransferFunction()
        color_transfer_function.AddRGBPoint(0, 0, 0, 0)
        color_transfer_function.AddRGBPoint(64, 1, 0, 0)
        color_transfer_function.AddRGBPoint(128, 0, 0, 1)
        color_transfer_function.AddRGBPoint(192, 0, 1, 0)
        color_transfer_function.AddRGBPoint(255, 0, .2, 0)

        # Create properties, mappers, volume actors, and ray cast function.
        volume_property = vtkVolumeProperty()
        volume_property.SetColor(color_transfer_function)
#         volume_property.SetColor(color_transfer_function[0],
#                                  color_transfer_function[1],
#                                  color_transfer_function[2])
        volume_property.SetScalarOpacity(opacity_transfer_function)

        volume_mapper = vtkFixedPointVolumeRayCastMapper()
        volume_mapper.SetInputConnection(reader.GetOutputPort())

        volume = vtkVolume()
        volume.SetMapper(volume_mapper)
        volume.SetProperty(volume_property)

        # Create outline.
        outline = vtkOutlineFilter()
        outline.SetInputConnection(reader.GetOutputPort())

        outline_mapper = vtkPolyDataMapper()
        outline_mapper.SetInputConnection(outline.GetOutputPort())

        outlineActor = vtkActor()
        outlineActor.SetMapper(outline_mapper)
        outlineActor.GetProperty().SetColor(1, 1, 1)

        # Create the renderer.
        ren = vtkRenderer()
        ren.AddActor(axesActor)
        ren.AddVolume(volume)
        ren.SetBackground(0.1, 0.2, 0.4)

        renWin = vtkRenderWindow()
        renWin.AddRenderer(ren)
        renWin.SetSize(256, 256)

        # Create the GUI: two renderer widgets and a quit button.
        self.root = tkinter.Tk()
        self.root.title("cursor3D")
        # Define what to do when the user explicitly closes a window.
        self.root.protocol("WM_DELETE_WINDOW", OnClosing)

        # Help label, frame and quit button
        helpLabel = tkinter.Label(self.root,
            text=
            "MiddleMouse (or shift-LeftMouse) in image viewer to place cursor")
        displayFrame = tkinter.Frame(self.root)
        quitButton = tkinter.Button(self.root, text= "Quit", command=OnClosing)

        # Pack the GUI.
        helpLabel.pack()
        displayFrame.pack(fill=BOTH, expand=TRUE)
        quitButton.pack(fill=X)

        # Create the viewer widget.
        viewerFrame = tkinter.Frame(displayFrame)
        viewerFrame.pack(padx=3, pady=3, side=LEFT, anchor=N,
                        fill=BOTH, expand=FALSE)
        self.tkvw = vtkTkImageViewerWidget(viewerFrame, iv=viewer,
                        width=264, height=264)
        viewerControls = tkinter.Frame(viewerFrame)
        viewerControls.pack(side=BOTTOM, anchor=S, fill=BOTH, expand=TRUE)
        self.tkvw.pack(side=TOP, anchor=N, fill=BOTH, expand=FALSE)
        downButton = tkinter.Button(viewerControls, text="Down",
                            command=[ViewerDown,self.tkvw])
        upButton = tkinter.Button(viewerControls, text="Up",
                            command=[ViewerUp,self.tkvw])
        sliceLabel = tkinter.Label(viewerControls,
                            text="slice: "+str(CURSOR_Z*IMAGE_MAG_Z))
        downButton.pack(side=LEFT, expand=TRUE, fill=BOTH)
        upButton.pack(side=LEFT, expand=TRUE, fill=BOTH)
        sliceLabel.pack(side=LEFT, expand=TRUE, fill=BOTH)

        # Create the render widget
        renderFrame = tkinter.Frame(displayFrame)
        renderFrame.pack(padx=3, pady=3, side=LEFT, anchor=N,
                        fill=BOTH, expand=TRUE)
        self.tkrw = vtkTkRenderWidget(renderFrame, rw=renWin,
                        width=264, height=264)

        self.tkrw.pack(side=TOP, anchor=N, fill=BOTH, expand=TRUE)

        # Bindings
        self.tkvw.BindTkImageViewer()
        self.tkrw.BindTkRenderWidget()

        # Lets add an extra binding of the middle button in the image viewer
        # to set the cursor location.
        self.tkvw.bind('<Button-2>',SetCursorFromViewer)
        self.tkvw.bind('<Shift-Button-1>',SetCursorFromViewer)

        # Associate the functions with the buttons and label.
        #
        downButton.config(command=partial(ViewerDown, self.tkvw))
        upButton.config(command=partial(ViewerUp, self.tkvw))

    def DoIt(self):
        self.SetUp()
        self.tkvw.Render()
        self.tkrw.Render()
        self.root.update()
        # If you want to interact and use the sliders etc,
        # uncomment the following line.
        #self.root.mainloop()
        img_file = "cursor3D.png"
        Testing.compareImage(self.tkvw.GetImageViewer().GetRenderWindow(),
                             Testing.getAbsImagePath(img_file))
        # Testing.interact()
        self.root.destroy()

if __name__ == '__main__':
    cases = [(Cursor3DViewer, 'DoIt')]
    del Cursor3DViewer
    Testing.main(cases)
