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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
from shapeobject import ShapeObject
import gtk, math
# The global grid unit size, in pixels. Objects will snap to multiples of this value.
GRID_SIZE = 50
# Width and height of region within which we can drag objects.
DRAGGING_RECT_WIDTH = 24*GRID_SIZE
DRAGGING_RECT_HEIGHT = 16*GRID_SIZE
class VolumeObject(ShapeObject):
"""Quasi three-dimensional container object."""
def __init__(self, color, symbol, pos, height = 400, lower_radius = 50, upper_radius = 100):
ShapeObject.__init__(self, color, symbol, [ Vector(0, 0), Vector(2.0 * upper_radius, 0), Vector(lower_radius + upper_radius, height), \
Vector(upper_radius - lower_radius , height) ], pos, 0.0, Vector(0, 0), False)
self.color = color
self.symbol = symbol
self.height = height
self.lower_radius = lower_radius
self.upper_radius = upper_radius
self.pos = pos
self.volume = self.calculate_volume()
self.selectable = True
self.symbol_visible = True
self.rotatable = False
self.calculate_bounds()
print "VolumeObject constructor: volume =", self.volume
def calculate_volume(self):
return (math.pi * self.height / 3.0) *(self.lower_radius * self.lower_radius + self.lower_radius * self.upper_radius + self.upper_radius * self.upper_radius)
# Modify to take into account trapezoids above and to the right.
def is_in_container(self):
for p in self.points:
p = self.transform_point(p)
if p.x < -2 or p.x > DRAGGING_RECT_WIDTH + 2 - 50 or \
p.y < -1 + 50 or p.y > DRAGGING_RECT_HEIGHT:
return False
return True
def draw_ellipse(self, cr, x, y, width, height):
cr.save();
cr.translate (x + width / 2., y + height / 2.);
cr.scale(width / 2., height / 2.);
cr.arc(0., 0., 1., 0., 2 * math.pi);
cr.restore();
def draw(self, cr):
cr.scale(self.scale, self.scale)
# Transform the points.
points = [self.transform_point(p) for p in self.points]
# Generate the shape.
cr.move_to(points[1].x, points[1].y)
cr.line_to(points[2].x, points[2].y)
# Draw the outline.
if self.selected:
cr.set_dash((10, 10), 0)
cr.set_source_rgb(0.0, 0.0, 0.0)
cr.set_line_width(4.0)
cr.stroke()
# Generate the shape.
cr.move_to(points[0].x, points[0].y)
cr.line_to(points[3].x, points[3].y)
# Draw the outline.
if self.selected:
cr.set_dash((10, 10), 0)
cr.set_source_rgb(0.0, 0.0, 0.0)
cr.set_line_width(4.0)
cr.stroke()
# Draw the lower ellipse
cr.save()
if self.selected:
cr.set_dash((10, 10), 0)
cr.set_source_rgb(0.0, 0.0, 0.0)
cr.set_line_width(4.0)
self.draw_ellipse(cr, self.pos.x - self.lower_radius, self.pos.y + self.height/2.0 - self.lower_radius/4.0, 2.0 * self.lower_radius, self.lower_radius/2.0)
cr.stroke()
cr.restore()
# Draw the upper ellipse
cr.save()
if self.selected:
cr.set_dash((10, 10), 0)
cr.set_source_rgb(0.0, 0.0, 0.0)
cr.set_line_width(4.0)
#cr.arc(self.pos.x, self.pos.y - self.size.y/2, self.size.x/2, 0.0, 2.0 * math.pi)
self.draw_ellipse(cr, self.pos.x - self.upper_radius, self.pos.y - self.height/2.0 - self.upper_radius/4.0, 2.0 * self.upper_radius, self.upper_radius/2.0)
cr.stroke()
cr.restore()
# Draw the symbol (capital letter representing the shapes's area).
if self.symbol_visible:
cr.set_source_rgb(0, 0, 0)
cr.set_font_size(50)
x_bearing, y_bearing, width, height = cr.text_extents(self.symbol)[:4]
cr.move_to(self.pos.x - x_bearing - width/2, self.pos.y - y_bearing - height/2)
cr.show_text(self.symbol)
## Algorithm to test whether point is inside the polygon
#def contains_point(self, pos):
# n = 0
# p = pos
#
# for i in range (0, len(self.points) ):
# p1 = self.points[i]
# p2 = self.points[(i+1) % len(self.points)]
#
# p1 = self.transform_point(p1)
# p2 = self.transform_point(p2)
#
# if p.y > min(p1.y, p2.y):
# if p.y <= max(p1.y, p2.y):
# if p.x <= max(p1.x, p2.x):
# if p1.y != p2.y:
# x = (p.y-p1.y)*(p2.x-p1.x)/(p2.y-p1.y)+p1.x
# if p1.x == p2.x or p.x <= x:
# n = n + 1
#
# if n % 2 == 0:
# return(False)
# else:
# return(True)
#
#def is_in_container(self):
# for p in self.points:
# p = self.transform_point(p)
# if p.x < -2 or p.x > DRAGGING_RECT_WIDTH + 2 or \
# p.y < -1 or p.y > DRAGGING_RECT_HEIGHT:
# return False
# return True
#
#def move(self, pos):
# # Tentatively place in the object in the new position
# last_pos = self.pos
# self.pos = pos
#
# # If any point is out of bounds, move object back to last position.
# if not self.is_in_container():
# self.pos = last_pos
#
# self.calculate_bounds()
#
# if self.container:
# self.container.queue_draw()
#
#def rotate(self, angle):
# # Tentatively rotate the object to the new angle
# last_angle = self.angle
# self.angle = angle
#
# # If any point is out of bounds, move object back to last angle.
# if not self.is_in_container():
# self.angle = last_angle
#
# self.calculate_bounds()
#
# self.container.queue_draw()
#
#
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