# Copyright 2008 by Peter Moxhay and Wade Brainerd.  
# This file is part of Math.
#
# Math 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.
# 
# Math 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 Math.  If not, see <http://www.gnu.org/licenses/>.
from objectarea import Object
from vector import Vector

import gtk, rsvg

WALK_SVG = rsvg.Handle('walk.svg')

class ProgressObject(Object):
    """Horizontal indicator of progress through a lesson."""

    def __init__(self, pos, num_steps):
        Object.__init__(self)
        
        self.pos = pos
        self.num_steps = num_steps

        self.cur_step = 0
        
        self.draggable = False
        self.selectable = False
        
    def set_step(self, step):
        self.cur_step = step
        
    def take_a_step(self):
        self.cur_step += 1

    def draw(self, cr):
        for i in xrange(0, self.num_steps):
            if i < self.cur_step:
                cr.set_source_rgb(0.4, 1.0, 0.4)
            elif i == self.cur_step:
                cr.set_source_rgb(0.9, 0.9, 0.0)
            else:
                cr.set_source_rgb(0.4, 0.4, 0.4)

            cr.rectangle(self.pos.x + i*80, self.pos.y + 88, 60, 10)
            cr.fill()

        cr.translate(self.pos.x + self.cur_step * 80, self.pos.y)
        #cr.scale(0.5, 0.5)
        WALK_SVG.render_cairo(cr)

    def get_bounds(self):
        return self.pos, self.pos + Vector(self.num_steps * 15, 20)