# -*- coding: utf-8 -*-
"""
@namespace Desenho

    Pixmap manipulation


Copyright 2007, NATE-LSI-EPUSP

Oficina is developed in Brazil at Escola Politécnica of
Universidade de São Paulo. NATE is part of LSI (Integrable
Systems Laboratory) and stands for Learning, Work and Entertainment
Research Group. Visit our web page:
www.lsi.usp.br/nate
Suggestions, bugs and doubts, please email oficina@lsi.usp.br

Oficina 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 version 2 of
the License.

Oficina 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 Oficina; if not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
Boston, MA  02110-1301  USA.
The copy of the GNU General Public License is found in the
COPYING file included in the source distribution.


Authors:

Joyce Alessandra Saul               (joycealess@gmail.com)
Andre Mossinato                     (andremossinato@gmail.com)
Nathalia Sautchuk Patrício          (nathalia.sautchuk@gmail.com)
Pedro Kayatt                        (pekayatt@gmail.com)
Rafael Barbolo Lopes                (barbolo@gmail.com)
Alexandre A. Gonçalves Martinazzo   (alexandremartinazzo@gmail.com)

Colaborators:
Bruno Gola                          (brunogola@gmail.com)

Group Manager:
Irene Karaguilla Ficheman           (irene@lsi.usp.br)

Cientific Coordinator:
Roseli de Deus Lopes                (roseli@lsi.usp.br)

UI Design (OLPC):
Eben Eliason                        (eben@laptop.org)

Project Coordinator (OLPC):
Manusheel Gupta                     (manu@laptop.org)

Project Advisor (OLPC):
Walter Bender                       (walter@laptop.org)

"""


import  pygtk
pygtk.require('2.0')
import gtk
import logging
import math
import gc
import gobject
import cairo

RESIZE_DELAY = 500  # The time to wait for the resize operation to be
                    # executed, after the resize controls are pressed.


##Pixmap manipulation
class Desenho:

    def __init__(self, widget):
        """Initialize Desenho object.

            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)

        """
        self._resize_timer = None
        self._rainbow_color_list = ['#ff0000',  # red
                '#ff8000',  # orange
                '#ffff00',  # yellow
                '#80ff00',  # lime
                '#00ff00',  # green
                '#00ff80',  # green water
                '#00ffff',  # light blue
                '#007fff',  # almost blue
                '#0000ff',  # blue
                '#8000ff',  # indigo
                '#ff00ff',  # pink violet
                '#ff0080']  # violet
        self._rainbow_counter = 0

        self.points = []

    def line(self, widget, coords, temp):
        """Draw line.

            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple

        """
        width, height = widget.window.get_size()

        if temp == True:
            ctx = widget.temp_ctx
        else:
            ctx = widget.drawing_ctx

        ctx.set_line_width(widget.tool['line size'])
        ctx.set_line_cap(cairo.LINE_CAP_ROUND)
        ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
        ctx.move_to(widget.oldx, widget.oldy)
        ctx.line_to(coords[0], coords[1])
        ctx.stroke()
        widget.queue_draw()

    def eraser(self, widget, coords, last):
        """Erase part of the drawing.

            @param  self -- Desenho.Desenho instance
            @param  last -- last of oldx
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  size -- integer (default 30)
            @param  shape -- string (default 'circle')

        """
        widget.drawing_ctx.set_source_rgba(1.0, 1.0, 1.0, 1.0)
        self._trace(widget, coords, last)

    def brush(self, widget, coords, last):
        """Paint with brush.

            @param  self -- Desenho.Desenho instance
            @param  last -- last of oldx
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  size -- integer (default 30)
            @param  shape -- string (default 'circle')

        """
        widget.drawing_ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
        logging.error('brush')
        self._trace(widget, coords, last)

    def stamp(self, widget, coords, last, stamp_size=20):
        """Paint with stamp.

            @param  self -- Desenho.Desenho instance
            @param  last -- last of oldx
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  stamp_size -- integer (default 20)

        """
        widget.desenha = False
        gc = widget.gc_brush

        width = widget.resized_stamp.get_width()
        height = widget.resized_stamp.get_height()
        dx = coords[0] - width / 2
        dy = coords[1] - height / 2
        widget.pixmap.draw_pixbuf(gc, widget.resized_stamp,
            0, 0, dx, dy, width, height)

        widget.queue_draw()

    def rainbow(self, widget, coords, last):
        """Paint with rainbow.

            @param  self -- Desenho.Desenho instance
            @param  last -- last of oldx
            @param  widget -- Area object (GtkDrawingArea)
            @param  color -- select the color adress
            @param  coords -- Two value tuple
            @param  size -- integer (default 30)
            @param  shape -- string (default 'circle')

        """
        _color_str = self._rainbow_color_list[self._rainbow_counter]
        _color = gtk.gdk.color_parse(_color_str)
        self._rainbow_counter += 1
        if self._rainbow_counter > 11:
            self._rainbow_counter = 0

        widget.drawing_ctx.set_source_rgba(_color.red, _color.green,
                _color.blue, 0.3)
        self._trace(widget, coords, last)

    def _trace(self, widget, coords, last):
        widget.desenha = False
        size = widget.tool['line size']
        shape = widget.tool['line shape']
        if shape == 'circle':
            logging.error('trace circle')
            if last:
                logging.error('trace circle last')
                widget.drawing_ctx.set_line_width(size)

                widget.drawing_ctx.set_line_cap(cairo.LINE_CAP_ROUND)
                widget.drawing_ctx.set_line_join(cairo.LINE_JOIN_ROUND)
                widget.drawing_ctx.move_to(last[0], last[1])
                widget.drawing_ctx.line_to(coords[0], coords[1])
                widget.drawing_ctx.stroke()
            else:
                widget.drawing_ctx.move_to(coords[0],
                        coords[1])
                widget.drawing_ctx.arc(coords[0], coords[1],
                        size / 2, 0., 2 * math.pi)
                widget.drawing_ctx.fill()

        elif shape == 'square':
            if last:
                points = [(last[0] - size / 2, last[1] - size / 2),
                    (coords[0] - size / 2, coords[1] - size / 2),
                    (coords[0] + size / 2, coords[1] + size / 2),
                    (last[0] + size / 2, last[1] + size / 2)]
                for point in points:
                    widget.drawing_ctx.line_to(*point)
                widget.drawing_ctx.fill()
                points = [(last[0] + size / 2, last[1] - size / 2),
                    (coords[0] + size / 2, coords[1] - size / 2),
                    (coords[0] - size / 2, coords[1] + size / 2),
                    (last[0] - size / 2, last[1] + size / 2)]
                for point in points:
                    widget.drawing_ctx.line_to(*point)
                widget.drawing_ctx.fill()
            else:
                widget.drawing_ctx.move_to(coords[0] - size / 2,
                        coords[1] - size / 2)
                widget.drawing_ctx.rectangle(coords[0] - size / 2,
                        coords[1] - size / 2, size, size)
                widget.drawing_ctx.fill()

        if last:
            x = min(coords[0], last[0])
            width = max(coords[0], last[0]) - x
            y = min(coords[1], last[1])
            height = max(coords[1], last[1]) - y
            # We add size to avoid drawing dotted lines
            widget.queue_draw_area(x - size, y - size,
                width + size * 2, height + size * 2)
        else:
            widget.queue_draw()

    def square(self, widget, event, coords, temp, fill):
        """Draw a square.

            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  temp -- switch between drawing context and temp context
            @param  fill -- Fill object
        """
        if temp == True:
            ctx = widget.temp_ctx
        else:
            ctx = widget.drawing_ctx
        width, height = widget.window.get_size()

        x, y, dx, dy, = self.adjust(widget, coords)

        ctx.rectangle(x, y, dx, dy)
        if fill == True:
            ctx.set_source_rgba(*widget.tool['cairo_fill_color'])
            ctx.fill_preserve()
        ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
        ctx.stroke()
        widget.queue_draw_area(x, y, dx, dy)

    def _draw_polygon(self, widget, temp, fill, points, closed=True):
        if not points:
            return
        if temp == True:
            ctx = widget.temp_ctx
        else:
            ctx = widget.drawing_ctx
        width, height = widget.window.get_size()

        ctx.save()
        ctx.move_to(*points[0])
        for point in points:
            ctx.line_to(*point)
        if closed:
            ctx.close_path()
        ctx.set_line_join(cairo.LINE_JOIN_MITER)
        ctx.set_line_width(widget.tool['line size'])
        if fill:
            ctx.set_source_rgba(*widget.tool['cairo_fill_color'])
            ctx.fill_preserve()
        ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
        ctx.stroke()
        ctx.restore()
        widget.queue_draw()

    def triangle(self, widget, coords, temp, fill):
        """Draw a triangle.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  temp -- switch between drawing context and temp context
            @param  fill -- Fill object
        """

        points = [(widget.oldx, widget.oldy),
             (widget.oldx + int((coords[0] - widget.oldx) / 2), coords[1]),
             (coords[0], widget.oldy)]
        self._draw_polygon(widget, temp, fill, points)

    def trapezoid(self, widget, coords, temp, fill):
        """Draw a trapezoid.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  temp -- switch between context and temp context
            @param  fill -- Fill object
        """

        dif = int((coords[0] - widget.oldx) / 4)
        points = [(widget.oldx, widget.oldy), (widget.oldx + dif, coords[1]),
                  (coords[0] - dif, coords[1]), (coords[0], widget.oldy)]
        self._draw_polygon(widget, temp, fill, points)

    def arrow(self, widget, coords, temp, fill):
        """Draw a arrow.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  temp -- switch between context and temp context
            @param  fill -- Fill object
        """
        x = coords[0] - widget.oldx
        y = coords[1] - widget.oldy
        A = math.atan2(y, x)
        dA = 2 * math.pi / 2
        r = math.hypot(y, x)
        m = math.sin(A)
        p = [(widget.oldx, widget.oldy)]
        p.append((widget.oldx + int(r * math.cos(A)),\
                  widget.oldy + int(r * math.sin(A))))
        p.append((widget.oldx + int(0.74 * r * math.cos(A + dA / 6)),\
                  widget.oldy + int(0.74 * r * math.sin(A + dA / 6))))
        p.append((widget.oldx + int(2 * r * math.cos(A + dA / 6 + dA / 20)),\
                  widget.oldy + int(2 * r * math.sin(A + dA / 6 + dA / 20))))
        p.append((widget.oldx +\
                  int(2 * r * math.cos(A + dA / 6 - dA / 20 + dA / 6)),\
                  widget.oldy +\
                  int(2 * r * math.sin(A + dA / 6 - dA / 20 + dA / 6))))
        p.append((widget.oldx + int(0.74 * r * math.cos(A + dA / 6 + dA / 6)),\
                  widget.oldy + int(0.74 * r * math.sin(A + dA / 6 + dA / 6))))
        p.append((widget.oldx + int(r * math.cos(A + dA / 2)),\
                  widget.oldy + int(r * math.sin(A + dA / 2))))

        self._draw_polygon(widget, temp, fill, p)

    def parallelogram(self, widget, coords, temp, fill):
        """Draw a parallelogram.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  temp -- switch between context and temp context
            @param  fill -- Fill object
        """
        x = int((coords[0] - widget.oldx) / 4)
        points = [(widget.oldx, widget.oldy), (coords[0] - x, widget.oldy),
                  (coords[0], coords[1]), (widget.oldx + x, coords[1])]
        self._draw_polygon(widget, temp, fill, points)

    def star(self, widget, coords, n, temp, fill):
        """Draw polygon with n sides.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  n -- number of sides
            @param  temp -- switch between context and temp context
            @param  fill -- Fill object
        """
        x = coords[0] - widget.oldx
        y = coords[1] - widget.oldy
        A = math.atan2(y, x)
        dA = 2 * math.pi / n
        r = math.hypot(y, x)
        p = [(widget.oldx + int(r * math.cos(A)), \
             widget.oldy + int(r * math.sin(A))), \
             (widget.oldx + int(0.4 * r * math.cos(A + dA / 2)),
             widget.oldy + int(0.4 * r * math.sin(A + dA / 2)))]
        for i in range(int(n) - 1):
            A = A + dA
            p.append((widget.oldx + int(r * math.cos(A)), \
                     widget.oldy + int(r * math.sin(A))))
            p.append((widget.oldx + int(0.4 * r * math.cos(A + dA / 2)), \
                     widget.oldy + int(0.4 * r * math.sin(A + dA / 2))))
        self._draw_polygon(widget, temp, fill, p)

    def polygon_regular(self, widget, coords, n, temp, fill):
        """Draw polygon with n sides.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  n -- number of sides
            @param  temp -- switch between context and temp context
            @param  fill -- Fill object
        """
        x = coords[0] - widget.oldx
        y = coords[1] - widget.oldy
        A = math.atan2(y, x)
        dA = 2 * math.pi / n
        r = math.hypot(y, x)
        p = [(widget.oldx + int(r * math.cos(A)), \
             widget.oldy + int(r * math.sin(A)))]
        for i in range(int(n) - 1):
            A = A + dA
            p.append((widget.oldx + int(r * math.cos(A)), \
                 widget.oldy + int(r * math.sin(A))))
        self._draw_polygon(widget, temp, fill, p)

    def heart(self, widget, coords, temp, fill):
        """Draw polygon with n sides.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  temp -- switch between context and temp context
            @param  fill -- Fill object
        """
        if temp == True:
            ctx = widget.temp_ctx
        else:
            ctx = widget.drawing_ctx

        width, height = widget.window.get_size()

        if coords[0] < widget.oldx:
            x = coords[0]
        else:
            x = widget.oldx
        if coords[1] < widget.oldy:
            y = coords[1]
        else:
            y = widget.oldy

        dx = math.fabs(coords[0] - widget.oldx)
        dy = math.fabs(coords[1] - widget.oldy)
        r = math.hypot(dy, dy)
        w = r / 10.0

        if w == 0:
            # non invertible cairo matrix
            return

        ctx.set_line_width(widget.tool['line size'])
        line_width = ctx.get_line_width()

        ctx.save()
        ctx.translate(widget.oldx, widget.oldy)
        ctx.scale(w, w)
        ctx.move_to(0, 0)
        ctx.curve_to(0, -30, -50, -30, -50, 0)
        ctx.curve_to(-50, 30, 0, 35, 0, 60)
        ctx.curve_to (0, 35, 50, 30, 50, 0)
        ctx.curve_to (50, -30, 0, -30, 0, 0)

        ctx.set_line_width(line_width / w)
        if fill:
            ctx.set_source_rgba(*widget.tool['cairo_fill_color'])
            ctx.fill_preserve()
        ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
        ctx.stroke()
        ctx.restore()

        widget.queue_draw()

    def circle(self, widget, coords, temp, fill):
        """Draw a circle.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  temp -- switch between context and temp context
            @param  fill -- Fill object
        """
        if temp == True:
            ctx = widget.temp_ctx
        else:
            ctx = widget.drawing_ctx
        width, height = widget.window.get_size()

        x, y, dx, dy = self.adjust(widget, coords)
        if dx == 0 or dy == 0:
            # scale by 0 gives error
            return
        ctx.set_line_width(widget.tool['line size'])
        line_width = ctx.get_line_width()
        ctx.save()
        ctx.translate(x, y)
        ctx.scale(dx, dy)
        ctx.arc(0., 0., 1., 0., 2 * math.pi)
        ctx.set_line_width(line_width / float(min(dx, dy)))
        if fill:
            ctx.set_source_rgba(*widget.tool['cairo_fill_color'])
            ctx.fill_preserve()
        ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
        ctx.stroke()
        ctx.restore()
        widget.queue_draw()

    def clear(self, widget):
        """Clear the drawing.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
        """
        logging.debug('Desenho.clear')
        widget.desenha = False

        widget.textos = []
        x, y = 0, 0
        width, height = widget.window.get_size()
        # try to clear a selected area first
        if widget.is_selected():
            x, y, width, height = widget.get_selection_bounds()
        logging.error('clear %s', (x, y, width, height))

        widget.drawing_ctx.rectangle(x, y, width, height)
        widget.drawing_ctx.set_source_rgb(1.0, 1.0, 1.0)
        widget.drawing_ctx.fill()

        widget.queue_draw()

    def text(self, widget, event):
        """Display and draw text in the drawing area.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  event -- GdkEvent
        """

        if not widget.text_in_progress:
            widget.text_in_progress = True

            x, y = int(event.x), int(event.y)
            widget.activity.move_textview(x, y)
            widget.activity.textview.show()
            widget.activity.textview.grab_focus()

        else:
            widget.text_in_progress = False

            try:
            # This works for a gtk.Entry
                text = widget.activity.textview.get_text()
            except AttributeError:
            # This works for a gtk.TextView
                buf = widget.activity.textview.get_buffer()
                start, end = buf.get_bounds()
                text = buf.get_text(start, end)

            layout = widget.activity.textview.create_pango_layout(text)

            widget.pixmap.draw_layout(widget.gc_brush,
                widget.oldx, widget.oldy, layout)
            widget.pixmap_temp.draw_layout(widget.gc,
                widget.oldx, widget.oldy, layout)
            widget.activity.textview.hide()

            try:
                widget.activity.textview.set_text('')
            except AttributeError:
                buf.set_text('')

            widget.enableUndo(widget)

            widget.queue_draw()

    def selection(self, widget, coords):
        """Make a selection.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  fill -- Fill object
        """

        width, height = widget.window.get_size()

        x, y, dx, dy = self.adjust(widget, coords, True)
        widget.set_selection_bounds(x, y, dx, dy)
        widget.queue_draw()

    def moveSelection(self, widget, coords):
        """Move the selection.

            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  mvcopy -- Copy or Move
            @param  pixbuf_copy -- For import image

        """

        width, height = widget.window.get_size()

        widget.pixmap_temp.draw_drawable(widget.gc, widget.pixmap,
            0, 0, 0, 0, width, height)

        dx = int(coords[0] - widget.oldx)
        dy = int(coords[1] - widget.oldy)

        size = widget.pixmap_sel.get_size()

        widget.pixmap_temp.draw_drawable(widget.gc, widget.pixmap_sel,
            0, 0, widget.orig_x + dx, widget.orig_y + dy, size[0], size[1])

        widget.set_selection_bounds(widget.orig_x + dx, widget.orig_y + dy,
                size[0], size[1])

#        widget.pixmap_temp.draw_rectangle(widget.gc_selection, False,
#            widget.orig_x + dx, widget.orig_y + dy, size[0], size[1])
#        widget.pixmap_temp.draw_rectangle(widget.gc_selection1, False,
#            widget.orig_x + dx - 1, widget.orig_y + dy - 1,
#            size[0] + 2, size[1] + 2)

        widget.queue_draw()

    def resizeSelection(self, widget, width_percent, height_percent):
        """Resize the selection.

            @param  self -- Desenho.Desenho instance
            @param  width_percent -- Percent of x scale
            @param  height_percent -- Percent of y scale

        """
        width, height = widget.window.get_size()
        widget.desenha = True
        widget.selmove = True

        #Create the pixbuf for future resizes
        try:
            self.pixbuf_resize
        except:
            size = widget.pixmap_sel.get_size()
            self.pixbuf_resize = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, False,
                8, size[0], size[1])
            self.pixbuf_resize.get_from_drawable(widget.pixmap_sel,
                gtk.gdk.colormap_get_system(), 0, 0, 0, 0, size[0], size[1])

        w = self.pixbuf_resize.get_width()
        h = self.pixbuf_resize.get_height()
        wr = int(w * width_percent)
        hr = int(h * height_percent)

        self._draw_selection(widget, wr, hr, is_preview=True)

        # Add a timer for resize or update it if there is one already:
        if self._resize_timer is not None:
            gobject.source_remove(self._resize_timer)
        self._resize_timer = gobject.timeout_add(RESIZE_DELAY,
            self._do_resize, widget, wr, hr)

    def _do_resize(self, widget, wr, hr):
        """Do the resize calculation.

        """
        resized = self.pixbuf_resize.scale_simple(wr, hr, gtk.gdk.INTERP_HYPER)

        #Copy the resized picture to pixmap_sel
        try:
            del (widget.pixmap_sel)
        except:
            pass
        widget.pixmap_sel = gtk.gdk.Pixmap(widget.window, wr, hr, -1)
        widget.pixmap_sel.draw_pixbuf(widget.get_style().white_gc, resized,
            0, 0, 0, 0, wr, hr)

        #Draw the new pixmap_sel
        self._draw_selection(widget, wr, hr)

        # Clean the timer:
        self.resize_timer = None
        return False

    def _draw_selection(self, widget, wr, hr, is_preview=False):
        gc.collect()
        width, height = widget.window.get_size()

        widget.pixmap_temp.draw_drawable(widget.gc, widget.pixmap,
            0, 0, 0, 0, width, height)
        if is_preview:
            widget.pixmap_temp.draw_drawable(widget.gc, widget.pixmap_sel,
                0, 0, widget.orig_x, widget.orig_y, -1, -1)
        else:
            widget.pixmap_temp.draw_drawable(widget.gc, widget.pixmap_sel,
                0, 0, widget.orig_x, widget.orig_y, wr, hr)

        widget.set_selection_bounds(widget.orig_x, widget.orig_y, wr, hr)
#        widget.pixmap_temp.draw_rectangle(widget.gc_selection, False,
#            widget.orig_x, widget.orig_y, wr, hr)
#        widget.pixmap_temp.draw_rectangle(widget.gc_selection1, False,
#            widget.orig_x - 1, widget.orig_y - 1, wr + 2, hr + 2)

        widget.queue_draw()
        gc.collect()

    def freeform(self, widget, coords, temp, fill, param=None):
        """Draw polygon.
            @param  self -- Desenho.Desenho instance
            @param  widget -- Area object (GtkDrawingArea)
            @param  coords -- Two value tuple
            @param  temp -- switch between drawing context and temp context
            @param  fill -- Fill object
        """

        width, height = widget.window.get_size()

        logging.error('freeform param %s', param)
        if param == "moving":
            # mouse not pressed moving
            if self.points:
                if widget.last:
                    self.points.append((coords[0], coords[1]))
                    widget.last = []
                else:
                    self.points[-1] = (coords[0], coords[1])
        elif param == "motion":
            # when mousepress or mousemove
            if widget.last:
                self.points.append((widget.last[0], widget.last[1]))
                self.points.append((coords[0], coords[1]))
            else:
                self.points.append((widget.oldx, widget.oldy))
                self.points.append((coords[0], coords[1]))
            widget.enableUndo(widget, overrite=True)
            widget.last = coords
        elif param == "release":
            if len(self.points) > 2:
                first = self.points[0]
                dx = coords[0] - first[0]
                dy = coords[1] - first[1]
                d = math.hypot(dx, dy)
                if d > 20:
                    widget.last = coords
                    self.points.append(coords)
                else:
                    # close the polygon
                    logging.error('freeform ending')
                    self._draw_polygon(widget, False, fill, self.points)
                    widget.last = []
                    self.points = []
                    widget.enableUndo(widget, overrite=True)
                    widget.queue_draw()
                    return

        logging.error('freeform points (2) %s', self.points)
        widget.desenha = True
        # Display the polygon open in the temp canvas
        self._draw_polygon(widget, True, False, self.points, closed=False)
        widget.queue_draw()

    def adjust(self, widget, coords, locked=False):
        width, height = widget.window.get_size()
        if widget.oldx > int(coords[0]):
            xi = int(coords[0])
            xf = widget.oldx
        else:
            xi = widget.oldx
            xf = int(coords[0])

        if widget.oldy > int(coords[1]):
            yi = int(coords[1])
            yf = widget.oldy
        else:
            yi = widget.oldy
            yf = int(coords[1])

        if locked == True:
            if xi < 0:
                xi = 0
            if yi < 0:
                yi = 0
            if xf > width:
                xf = width
            if yf > height:
                yf = height

        dx = xf - xi
        dy = yf - yi
        return xi, yi, dx, dy