#
# Copyright © 2012 CEA
# Pierre Raybaut
# Licensed under the terms of the CECILL License
# (see guiqwt/__init__.py for details)

"""
rotatecrop
----------

The `rotatecrop` module provides a dialog box providing essential GUI elements 
for rotating (arbitrary angle) and cropping an image:
    
    * :py:class:`guiqwt.widgets.rotatecrop.RotateCropDialog`: dialog box
    * :py:class:`guiqwt.widgets.rotatecrop.RotateCropWidget`: equivalent widget

Reference
~~~~~~~~~

.. autoclass:: RotateCropDialog
   :members:
   :inherited-members:
.. autoclass:: RotateCropWidget
   :members:
   :inherited-members:
"""

from PyQt4.QtGui import QCheckBox
from PyQt4.QtCore import SIGNAL

# Local imports
from guiqwt.config import _
from guiqwt.builder import make
from guiqwt.image import get_image_in_shape
from guiqwt.widgets import base


class RotateCropMixin(base.BaseTransformMixin):
    """Rotate & Crop mixin class, to be mixed with a class providing the 
    get_plot method, like ImageDialog or RotateCropWidget (see below)"""
    def __init__(self):
        base.BaseTransformMixin.__init__(self)
        self.crop_rect = None

    #------BaseTransformMixin API----------------------------------------------
    def add_buttons_to_layout(self, layout):
        """Add tool buttons to layout"""
        # Show crop rectangle checkbox
        show_crop = QCheckBox(_(u"Show cropping rectangle"), self)
        show_crop.setChecked(True)
        self.connect(show_crop, SIGNAL("toggled(bool)"), self.show_crop_rect)
        layout.addWidget(show_crop)
        layout.addSpacing(15)
        base.BaseTransformMixin.add_buttons_to_layout(self, layout)
    
    def set_item(self, item):
        """Set associated item -- must be a TrImageItem object"""
        base.BaseTransformMixin.set_item(self, item)
        crect = make.annotated_rectangle(0, 0, 1, 1, _(u"Cropping rectangle"))
        self.crop_rect = crect
        crect.annotationparam.format = "%.1f cm"
        plot = self.get_plot()
        plot.add_item(crect)
        plot.set_active_item(crect)
        x0, y0, x1, y1 = self.item.get_crop_coordinates()
        crect.set_rect(x0, y0, x1, y1)
        plot.replot()
        
    def reset_transformation(self):
        """Reset transformation"""
        x0, y0, x1, y1 = self.item.border_rect.get_rect()
        self.crop_rect.set_rect(x0, y0, x1, y1)
    
    def apply_transformation(self):
        """Apply transformation, e.g. crop or rotate"""
        # Let's crop!
        i_points = self.item.border_rect.get_points()
        xmin, ymin = i_points.min(axis=0)
        xmax, ymax = i_points.max(axis=0)
        xc0, yc0, xc1, yc1 = self.crop_rect.shape.get_rect()
        left = max([0, xc0-xmin])
        right = max([0, xmax-xc1])
        top = max([0, yc0-ymin])
        bottom = max([0, ymax-yc1])
        self.item.set_crop(left, top, right, bottom)
#        print "set_crop:", left, top, right, bottom
        self.item.compute_bounds()
        self.get_plot().replot()
    
    def compute_transformation(self):
        """Compute transformation, return compute output array"""
        return get_image_in_shape(self.crop_rect, apply_interpolation=False)
    
    #------Private API---------------------------------------------------------
    def show_crop_rect(self, state):
        """Show/hide cropping rectangle shape"""
        self.crop_rect.setVisible(state)
        self.crop_rect.label.setVisible(state)
        self.get_plot().replot()


class RotateCropDialog(base.BaseTransformDialog, RotateCropMixin):
[docs]    """Rotate & Crop Dialog
    
    Rotate and crop a :py:class:`guiqwt.image.TrImageItem` plot item"""
    def __init__(self, parent, wintitle=None, options=None, resize_to=None):
        RotateCropMixin.__init__(self)
        base.BaseTransformDialog.__init__(self, parent, wintitle=wintitle,
                                          options=options, resize_to=resize_to)


class RotateCropWidget(base.BaseTransformWidget, RotateCropMixin):
[docs]    """Rotate & Crop Widget
    
    Rotate and crop a :py:class:`guiqwt.image.TrImageItem` plot item"""
    def __init__(self, parent, options=None):
        base.BaseTransformWidget.__init__(self, parent, options=options)
        RotateCropMixin.__init__(self)


class MultipleRotateCropWidget(base.BaseMultipleTransformWidget):
    """Multiple Rotate & Crop Widget
    
    Rotate and crop several :py:class:`guiqwt.image.TrImageItem` plot items"""
    TRANSFORM_WIDGET_CLASS = RotateCropWidget