#!/usr/bin/env pyformex
# $Id$
##
##  This file is part of pyFormex 0.8.5     Sun Nov  6 17:27:05 CET 2011
##  pyFormex is a tool for generating, manipulating and transforming 3D
##  geometrical models by sequences of mathematical operations.
##  Home page: http://pyformex.org
##  Project page:  https://savannah.nongnu.org/projects/pyformex/
##  Copyright (C) Benedict Verhegghe (benedict.verhegghe@ugent.be) 
##  Distributed under the GNU General Public License version 3 or later.
##
##
##  This program is free software: you can redistribute it and/or modify
##  it under the terms of the GNU General Public License as published by
##  the Free Software Foundation, either version 3 of the License, or
##  (at your option) any later version.
##
##  This program is distributed in the hope that it will be useful,
##  but WITHOUT ANY WARRANTY; without even the implied warranty of
##  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
##  GNU General Public License for more details.
##
##  You should have received a copy of the GNU General Public License
##  along with this program.  If not, see http://www.gnu.org/licenses/.
##
"""ColorImage

level = 'normal'
topics = ['image']
techniques = ['color']

"""
from gui.widgets import ImageView,simpleInputItem as I
from gui.imagecolor import *

def selectImage(fn):
    fn = askImageFile(fn)
    if fn:
        viewer.showImage(fn)
        loadImage(fn)
    return fn


def loadImage(fn):
    global image, scaled_image
    image = QImage(fn)
    if image.isNull():
        warning("Could not load image '%s'" % fn)
        return None

    w,h = image.width(),image.height()
    print "size = %sx%s" % (w,h)

    diag = currentDialog()
    if diag:
        diag.updateData({'nx':w,'ny':h})

    maxsiz = 40000.
    if w*h > maxsiz:
        scale = sqrt(maxsiz/w/h)
        w = int(w*scale)
        h = int(h*scale)
    return w,h


if __name__ == 'draw':  # allows loading this file as a module
    flat()
    lights(False)
    transparent(False)
    view('front')

    # default image file
    filename = getcfg('datadir')+'/butterfly.png'
    image = None
    scaled_image = None
    w,h = 200,200

    # image viewer widget
    viewer = ImageView(filename)

    transforms = {
        'flat': lambda F: F,
        'cylindrical': lambda F: F.cylindrical([2,0,1],[2.,90./float(nx),1.]).rollAxes(-1),
        'spherical': lambda F: F.spherical(scale=[1.,90./float(nx),2.]).rollAxes(-1),
        'projected_on_cylinder': lambda F: F.projectOnCylinder(2*R,1),
        }

    res = askItems([
        I('filename',filename,text='Image file',itemtype='button',func=selectImage),
        I('viewer',viewer,itemtype='widget'),  # the image previewing widget
        I('nx',w,text='width'),
        I('ny',h,text='height'),
        I('transform',itemtype='vradio',choices=transforms.keys()),
        ])

    if not res:
        exit()

    globals().update(res)

    if image is None:
        print "Loading image"
        loadImage(filename)

    if image is None:
        exit()

    # Create the colors
    color,colortable = image2glcolor(image.scaled(nx,ny))
    print "Converting image to color array"

    # Create a 2D grid of nx*ny elements
    print "Creating grid"
    R = float(nx)/pi
    L = float(ny)
    F = Formex('4:0123').replic2(nx,ny).centered()
    F = F.translate(2,R)

    # Transform grid and draw
    def drawTransform(transform):
        print "Transforming grid"
        trf = transforms[transform]
        G = trf(F)
        clear()
        print "Drawing Colored grid"
        draw(G,color=color,colormap=colortable)
        drawText('Created with pyFormex',20,20,size=24)


    layout(2)
    viewport(0)
    drawTransform('cylindrical')
    zoomAll()

    viewport(1)
    drawTransform('spherical')
    zoomAll()

# End
