/usr/share/pyshared/elements/drawing.py is in python-elements 0.13+svn20090823.230+dfsg-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This file is part of the 'Elements' Project
Elements is a 2D Physics API for Python (supporting Box2D2)
Copyright (C) 2008, The Elements Team, <elements@linuxuser.at>
Home: http://elements.linuxuser.at
IRC: #elements on irc.freenode.org
Code: http://www.assembla.com/wiki/show/elements
svn co http://svn2.assembla.com/svn/elements
License: GPLv3 | See LICENSE for the full text
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
"""
from math import pi
from math import cos
from math import sin
from math import sqrt
import tools
# Functions of a rendering class
# mandatory:
# __init__
# start_drawing
# after_drawing
# draw_circle
# draw_polygon
# draw_lines
# set_lineWidth
#
# renderer-specific mandatory functions:
# for pygame:
# set_surface
# for cairo:
# draw_text
# for opengl:
#
# IMPORTANT
# The drawing functions get the coordinates in their screen coordinate system
# no need for translations anymore :)
class draw_pygame(object):
""" This class handles the drawing with pygame, which is really
simple since we only need draw_ellipse and draw_polygon.
"""
lineWidth = 0
def __init__(self):
""" Load pygame.draw and pygame.Rect, and reference it for
the drawing methods
Parameters:
surface .... pygame surface (default: None)
lineWidth ..
Return: Class draw_pygame()
"""
print "* Pygame selected as renderer"
from pygame import draw
from pygame import Rect
self.draw = draw
self.Rect = Rect
def set_lineWidth(self, lw):
"""
"""
self.lineWidth = lw
def set_surface(self, surface):
"""
"""
self.surface = surface
def get_surface(self):
"""
"""
return self.surface
def start_drawing(self):
pass
def after_drawing(self):
pass
def draw_circle(self, clr, pt, radius, angle):
""" Draw a circle
Parameters:
pt ........ (x, y)
clr ....... color in rgb ((r), (g), (b))
radius .... circle radius
angle ..... rotation in radians
Return: -
"""
x, y = pt
x1 = x - radius
y1 = y - radius
rect = self.Rect( [x1, y1, 2*radius, 2*radius] )
self.draw.ellipse(self.surface, clr, rect, self.lineWidth)
# draw the orientation vector
if radius > 10:
rx = cos(angle) * radius
ry = -sin(angle) * radius
self.draw.line(self.surface, (255,255,255), pt, (x+rx, y+ry))
def draw_polygon(self, clr, points):
""" Draw a polygon
Parameters:
clr ....... color in rgb ((r), (g), (b))
points .... polygon points in normal (x,y) positions
Return: -
"""
self.draw.polygon(self.surface, clr, points, self.lineWidth)
#self.draw.lines(self.surface, clr, True, points)
def draw_lines(self, clr, closed, points, width=None):
""" Draw a polygon
Parameters:
clr ....... color in rgb ((r), (g), (b))
points .... polygon points in normal (x,y) positions
Return: -
"""
if width == None:
lw = self.lineWidth
else:
lw = width
self.draw.lines(self.surface, clr, closed, points, lw)
class draw_cairo(object):
""" This class handles the drawing with cairo, which is really
simple since we only need draw_ellipse and draw_polygon.
"""
window = None
da = None
circle_surface = None
box_surface = None
def __init__(self, drawMethod="filled"):
""" Load cairo.draw and cairo.Rect, and reference it for
the drawing methods
Return: Class draw_cairo()
"""
print "* Cairo selected as renderer"
import cairo
self.cairo = cairo
self.set_drawing_method(drawMethod)
#self.draw_box = self.draw_box_image
def set_lineWidth(self, lw): # unused
self.lineWidth = lw
def set_drawing_area(self, da):
""" Set the area for Cairo to draw to
da ...... drawing area (gtk.DrawingArea)
Return: -
"""
self.da = da
self.window = da.window
print "* Cairo renderer drawing area set"
def set_drawing_method(self, type):
""" type = filled, image """
self.draw_circle = getattr(self, "draw_circle_%s" % type)
#self.draw_box = getattr(self, "draw_box_%s" % type)
def start_drawing(self):
self.width, self.height = self.window.get_size()
self.imagesurface = self.cairo.ImageSurface(self.cairo.FORMAT_ARGB32, self.width, self.height);
self.ctx = ctx = self.cairo.Context(self.imagesurface)
ctx.set_source_rgb(1, 1, 1) # background color
ctx.paint()
ctx.move_to(0, 0)
ctx.set_source_rgb(0, 0, 0) # defaults for the rest of the drawing
ctx.set_line_width(1)
ctx.set_tolerance(0.1)
ctx.set_line_join(self.cairo.LINE_CAP_BUTT)
# LINE_CAP_BUTT, LINE_CAP_ROUND, LINE_CAP_SQUARE, LINE_JOIN_BEVEL, LINE_JOIN_MITER, LINE_JOIN_ROUND
#ctx.set_dash([20/4.0, 20/4.0], 0)
def after_drawing(self):
dest_ctx = self.window.cairo_create()
dest_ctx.set_source_surface(self.imagesurface)
dest_ctx.paint()
def set_circle_image(self, filename):
self.circle_surface = self.cairo.ImageSurface.create_from_png(filename)
self.draw_circle = self.draw_circle_image
# def set_box_image(self, filename):
# self.box_surface = self.cairo.ImageSurface.create_from_png(filename)
# self.draw_box = self.draw_box_image
def draw_circle_filled(self, clr, pt, radius, angle=0):
x, y = pt
clr = tools.rgb2floats(clr)
self.ctx.set_source_rgb(*clr)
self.ctx.move_to(x, y)
self.ctx.arc(x, y, radius, 0, 2*3.1415)
self.ctx.fill()
def draw_circle():
pass
def draw_circle_image(self, clr, pt, radius, angle=0, sf=None):
if sf == None:
sf = self.circle_surface
x, y = pt
self.ctx.save()
self.ctx.translate(x, y)
self.ctx.rotate(-angle)
image_r = sf.get_width() / 2
scale = float(radius) / image_r
self.ctx.scale(scale, scale)
self.ctx.translate(-0.5*sf.get_width(), -0.5*sf.get_height())
self.ctx.set_source_surface(sf)
self.ctx.paint()
self.ctx.restore()
def draw_image(self, source, pt, scale=1.0, rot=0, sourcepos=(0,0)):
self.ctx.save()
self.ctx.rotate(rot)
self.ctx.scale(scale, scale)
destx, desty = self.ctx.device_to_user_distance(pt[0], pt[1])
self.ctx.set_source_surface(source, destx-sourcepos[0], desty-sourcepos[1])
self.ctx.rectangle(destx, desty, source.get_width(), source.get_height())
self.ctx.fill()
self.ctx.restore()
def draw_polygon(self, clr, points):
""" Draw a polygon
Parameters:
clr ....... color in rgb ((r), (g), (b))
points .... polygon points in normal (x,y) positions
Return: -
"""
clr = tools.rgb2floats(clr)
self.ctx.set_source_rgb(clr[0], clr[1], clr[2])
pt = points[0]
self.ctx.move_to(pt[0], pt[1])
for pt in points[1:]:
self.ctx.line_to(pt[0], pt[1])
self.ctx.fill()
def draw_text(self, text, center, clr=(0,0,0), size=12, fontname="Georgia"):
clr = tools.rgb2floats(clr)
self.ctx.set_source_rgb(clr[0], clr[1], clr[2])
self.ctx.select_font_face(fontname, self.cairo.FONT_SLANT_NORMAL, self.cairo.FONT_WEIGHT_NORMAL)
self.ctx.set_font_size(size)
x_bearing, y_bearing, width, height = self.ctx.text_extents(text)[:4]
self.ctx.move_to(center[0] + 0.5 - width / 2 - x_bearing, center[1] + 0.5 - height / 2 - y_bearing)
self.ctx.show_text(text)
def draw_lines(self, clr, closed, points):
""" Draw a polygon
Parameters:
clr ....... color in rgb ((r), (g), (b))
closed .... whether or not to close the lines (as a polygon)
points .... polygon points in normal (x,y) positions
Return: -
"""
clr = tools.rgb2floats(clr)
self.ctx.set_source_rgb(clr[0], clr[1], clr[2])
pt = points[0]
self.ctx.move_to(pt[0], pt[1])
for pt in points[1:]:
self.ctx.line_to(pt[0], pt[1])
if closed:
pt = points[0]
self.ctx.line_to(pt[0], pt[1])
self.ctx.stroke()
class draw_opengl_pyglet(object):
""" This class handles the drawing with pyglet
"""
lineWidth = 0
def __init__(self):
""" Load pyglet.gl, and reference it for the drawing methods
Parameters:
surface .... not used with pyglet
lineWidth ..
"""
print "* OpenGL_Pyglet selected as renderer"
from pyglet import gl
self.gl = gl
def set_lineWidth(self, lw):
self.lineWidth = lw
def draw_circle(self, clr, pt, radius, a=0):
clr = tools.rgb2floats(clr)
self.gl.glColor3f(clr[0], clr[1], clr[2])
x, y = pt
segs = 15
coef = 2.0*pi/segs;
self.gl.glBegin(self.gl.GL_LINE_LOOP)
for n in range(segs):
rads = n*coef
self.gl.glVertex2f(radius*cos(rads + a) + x, radius*sin(rads + a) + y)
self.gl.glVertex2f(x,y)
self.gl.glEnd()
def draw_polygon(self, clr, points):
clr = tools.rgb2floats(clr)
self.gl.glColor3f(clr[0], clr[1], clr[2])
self.gl.glBegin(self.gl.GL_LINES)
p1 = points[0]
for p in points[1:]:
x1, y1 = p1
x2, y2 = p1 = p
self.gl.glVertex2f(x1, y1)
self.gl.glVertex2f(x2, y2)
x1, y1 = points[0]
self.gl.glVertex2f(x2, y2)
self.gl.glVertex2f(x1, y1)
self.gl.glEnd()
def draw_lines(self, clr, closed, points):
pass
def start_drawing(self):
pass
def after_drawing(self):
pass
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