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# 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, math, rsvg
STEM_SVG = rsvg.Handle('balance_stem.svg')
ARM_SVG = rsvg.Handle('balance_arm.svg')
PAN_SVG = rsvg.Handle('balance_pan.svg')
OVAL_SVG = rsvg.Handle('oval.svg')
MIDDLE_SVG = rsvg.Handle('balance_middle.svg')
LEFT_SVG = rsvg.Handle('balance_left.svg')
RIGHT_SVG = rsvg.Handle('balance_right.svg')
# Class containing various standard colors. Each color is a 3 element tuple.
class Color:
BLUE = (0.25, 0.25, 0.75)
GREEN = (0.25, 0.75, 0.25)
RED = (0.75, 0.25, 0.25)
class BalanceObject(Object):
"""Balance scale for comparing masses."""
def __init__(self, pos, container):
Object.__init__(self)
self.pos = pos
self.size = Vector (200, 200)
self.selectable = False
self.rotatable = False
self.container = container
self.amount_scale = 1.0
self.state = 'middle'
self.left_pan_full = False
self.right_pan_full = False
self.pan1_position = Vector(200, 500)
self.pan2_position = Vector(725, 500)
def draw(self, cr):
cr.scale(self.amount_scale, self.amount_scale)
#if self.state == 'left':
# self.draw_pan(cr, Vector (self.pos.x + self.amount_scale * 20, self.pos.y + self.amount_scale * (255 + 68)))
# self.draw_pan(cr, Vector (self.pos.x + self.amount_scale * 539, self.pos.y + self.amount_scale * (255 - 72)))
#elif self.state == 'right':
# self.draw_pan(cr, Vector (self.pos.x + self.amount_scale * 20, self.pos.y + self.amount_scale * (255 - 72)))
# self.draw_pan(cr, Vector (self.pos.x + self.amount_scale * 539, self.pos.y + self.amount_scale * (255 + 68)))
#else:
# self.draw_pan(cr, Vector (self.pos.x + self.amount_scale * 20, self.pos.y + self.amount_scale * 255))
# self.draw_pan(cr, Vector (self.pos.x + self.amount_scale * 539, self.pos.y + self.amount_scale * 255))
#
#self.draw_arm(cr, Vector (self.pos.x + self.amount_scale * 177, self.pos.y + self.amount_scale * 210))
if self.state == 'left':
self.draw_left(cr, Vector (self.pos.x, self.pos.y))
elif self.state == 'right':
self.draw_right(cr, Vector (self.pos.x, self.pos.y))
else:
self.draw_middle(cr, Vector (self.pos.x, self.pos.y))
def adjust_balance_state(self):
#print "BalanceObject: adjust_balance_state called, self.state =", self.state
if self.state == 'left':
self.pan1_position = Vector(200, 500 + 68)
self.pan2_position = Vector(725, 500 - 72)
elif self.state == 'right':
self.pan1_position = Vector(200, 500 - 72)
self.pan2_position = Vector(725, 500 + 68)
else:
self.pan1_position = Vector(200, 500)
self.pan2_position = Vector(725, 500)
self.queue_draw()
def draw_circle(self, cr, pos, color):
cr.save()
# Draw the fill.
#cr.set_source_rgb(color[0], color[1], color[2])
if self.selected:
cr.set_source_rgb(color[0]*1.6, color[1]*1.6, color[2]*1.6)
else:
cr.set_source_rgb(color[0], color[1], color[2])
cr.arc(self.pos.x + pos.x, self.pos.y + pos.y, 35, 0.0, 2.0 * math.pi)
cr.fill()
# Draw the outline.
#cr.set_source_rgb(color[0]*0.75, color[1]*0.75, color[2]*0.75)
if self.selected:
cr.set_dash((10, 10), 0)
cr.set_source_rgb(color[0]*0.75, color[1]*0.75, color[2]*0.75)
cr.set_line_width(4.0)
cr.arc(self.pos.x + pos.x, self.pos.y + pos.y, 35, 0.0, 2.0 * math.pi)
cr.stroke()
cr.restore()
def draw_stem(self, cr, pos):
cr.save()
cr.translate(pos.x, pos.y)
cr.scale(3.0, 3.0)
STEM_SVG.render_cairo(cr)
cr.restore()
def draw_left(self, cr, pos):
cr.save()
cr.translate(pos.x, pos.y)
cr.scale(3.0, 3.0)
LEFT_SVG.render_cairo(cr)
cr.restore()
def draw_right(self, cr, pos):
cr.save()
cr.translate(pos.x, pos.y)
cr.scale(3.0, 3.0)
RIGHT_SVG.render_cairo(cr)
cr.restore()
def draw_middle(self, cr, pos):
cr.save()
cr.translate(pos.x, pos.y)
cr.scale(3.0, 3.0)
MIDDLE_SVG.render_cairo(cr)
cr.restore()
def draw_arm(self, cr, pos):
cr.save()
if self.state == 'left':
cr.rotate(-15.0 * math.pi/180.0)
cr.translate(pos.x - 150 + 68, pos.y + 113)
elif self.state == 'right':
cr.rotate(15.0 * math.pi/180.0)
cr.translate(pos.x - 150 + 168 + 32, pos.y - 90 -40)
else:
cr.translate(pos.x, pos.y)
cr.scale(3.0, 3.0)
ARM_SVG.render_cairo(cr)
cr.restore()
def draw_pan(self, cr, pos):
cr.save()
cr.translate(pos.x, pos.y)
cr.scale(3.0, 3.0)
PAN_SVG.render_cairo(cr)
cr.restore()
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