#Copyright (c) 2007-8, Playful Invention Company. #Copyright (c) 2008-11, Walter Bender #Copyright (c) 2011 Collabora Ltd. #Permission is hereby granted, free of charge, to any person obtaining a copy #of this software and associated documentation files (the "Software"), to deal #in the Software without restriction, including without limitation the rights #to use, copy, modify, merge, publish, distribute, sublicense, and/or sell #copies of the Software, and to permit persons to whom the Software is #furnished to do so, subject to the following conditions: #The above copyright notice and this permission notice shall be included in #all copies or substantial portions of the Software. #THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR #IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, #FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE #AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER #LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, #OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN #THE SOFTWARE. import gtk import gobject from math import sin, cos, atan, pi, sqrt import os import pango import cairo import pangocairo import base64 from gettext import gettext as _ from sprites import Sprite from tasprite_factory import SVG from tautils import image_to_base64, get_path, data_to_string, round_int, \ debug_output from taconstants import BLACK, WHITE def wrap100(n): ''' A variant on mod... 101 -> 99; 199 -> 1 ''' n = int(n) n %= 200 if n > 99: n = 199 - n return n def calc_shade(c, s, invert=False): ''' Convert a color to the current shade (lightness/darkness). ''' # Assumes 16 bit input values if invert: if s < 0: return int(c / (1 + s * 0.8)) return int((c - 65536 * s * 0.9) / (1 - (s * 0.9))) else: if s < 0: return int(c * (1 + s * 0.8)) return int(c + (65536 - c) * s * 0.9) def calc_gray(c, g, invert=False): ''' Gray is a psuedo saturation calculation. ''' # Assumes 16 bit input values if g == 100: return c if invert: if g == 0: return c else: return int(((c * 100) - (32768 * (100 - g))) / g) else: return int(((c * g) + (32768 * (100 - g))) / 100) colors = {} DEGTOR = pi / 180. RTODEG = 180. / pi COLOR_TABLE = ( 0xFF0000, 0xFF0D00, 0xFF1A00, 0xFF2600, 0xFF3300, 0xFF4000, 0xFF4D00, 0xFF5900, 0xFF6600, 0xFF7300, 0xFF8000, 0xFF8C00, 0xFF9900, 0xFFA600, 0xFFB300, 0xFFBF00, 0xFFCC00, 0xFFD900, 0xFFE600, 0xFFF200, 0xFFFF00, 0xE6FF00, 0xCCFF00, 0xB3FF00, 0x99FF00, 0x80FF00, 0x66FF00, 0x4DFF00, 0x33FF00, 0x1AFF00, 0x00FF00, 0x00FF0D, 0x00FF1A, 0x00FF26, 0x00FF33, 0x00FF40, 0x00FF4D, 0x00FF59, 0x00FF66, 0x00FF73, 0x00FF80, 0x00FF8C, 0x00FF99, 0x00FFA6, 0x00FFB3, 0x00FFBF, 0x00FFCC, 0x00FFD9, 0x00FFE6, 0x00FFF2, 0x00FFFF, 0x00F2FF, 0x00E6FF, 0x00D9FF, 0x00CCFF, 0x00BFFF, 0x00B3FF, 0x00A6FF, 0x0099FF, 0x008CFF, 0x0080FF, 0x0073FF, 0x0066FF, 0x0059FF, 0x004DFF, 0x0040FF, 0x0033FF, 0x0026FF, 0x001AFF, 0x000DFF, 0x0000FF, 0x0D00FF, 0x1A00FF, 0x2600FF, 0x3300FF, 0x4000FF, 0x4D00FF, 0x5900FF, 0x6600FF, 0x7300FF, 0x8000FF, 0x8C00FF, 0x9900FF, 0xA600FF, 0xB300FF, 0xBF00FF, 0xCC00FF, 0xD900FF, 0xE600FF, 0xF200FF, 0xFF00FF, 0xFF00E6, 0xFF00CC, 0xFF00B3, 0xFF0099, 0xFF0080, 0xFF0066, 0xFF004D, 0xFF0033, 0xFF001A) class TurtleGraphics: ''' A class for the Turtle graphics canvas ''' def __init__(self, tw, width, height): ''' Create a sprite to hold the canvas. ''' self.tw = tw self.width = width self.height = height # Build a cairo.Context from a cairo.XlibSurface self.canvas = cairo.Context(self.tw.turtle_canvas) cr = gtk.gdk.CairoContext(self.canvas) cr.set_line_cap(1) # Set the line cap to be round self.cr_svg = None # Surface used for saving to SVG self.cx = 0 self.cy = 0 self.fgrgb = [255, 0, 0] self.bgrgb = [255, 248, 222] self.textsize = 48 # deprecated self.shade = 0 self.pendown = False self.xcor = 0 self.ycor = 0 self.heading = 0 self.pensize = 5 self.color = 0 self.gray = 100 self.fill = False self.poly_points = [] def setup_svg_surface(self): ''' Set up a surface for saving to SVG ''' if self.tw.running_sugar: svg_surface = cairo.SVGSurface( os.path.join(get_path(self.tw.activity, 'instance'), 'output.svg'), self.width, self.height) else: svg_surface = cairo.SVGSurface( os.path.join(os.getcwd(), 'output.svg'), self.width, self.height) self.cr_svg = cairo.Context(svg_surface) self.cr_svg.set_line_cap(1) # Set the line cap to be round def start_fill(self): ''' Start accumulating points of a polygon to fill. ''' self.fill = True self.poly_points = [] def stop_fill(self): ''' Fill the polygon. ''' self.fill = False if len(self.poly_points) == 0: return self.fill_polygon(self.poly_points) if self.tw.sharing(): shared_poly_points = [] for p in self.poly_points: shared_poly_points.append((self.screen_to_turtle_coordinates( p[0], p[1]))) event = 'F|%s' % (data_to_string([self._get_my_nick(), shared_poly_points])) self.tw.send_event(event) self.poly_points = [] def fill_polygon(self, poly_points): ''' Draw the polygon... ''' def _fill_polygon(cr, poly_points): cr.new_path() for i, p in enumerate(poly_points): if p[0] == 'move': cr.move_to(p[1], p[2]) elif p[0] == 'rarc': cr.arc(p[1], p[2], p[3], p[4], p[5]) elif p[0] == 'larc': cr.arc_negative(p[1], p[2], p[3], p[4], p[5]) else: # line cr.line_to(p[1], p[2]) cr.close_path() cr.fill() _fill_polygon(self.canvas, poly_points) self.inval() if self.cr_svg is not None: _fill_polygon(self.cr_svg, poly_points) def clearscreen(self, share=True): '''Clear the canvas and reset most graphics attributes to defaults.''' def _clearscreen(cr): cr.move_to(0, 0) self.bgrgb = [255, 248, 222] cr.set_source_rgb(self.bgrgb[0] / 255., self.bgrgb[1] / 255., self.bgrgb[2] / 255.) cr.rectangle(0, 0, self.width * 2, self.height * 2) cr.fill() _clearscreen(self.canvas) self.inval() if self.cr_svg is not None: _clearscreen(self.cr_svg) self.setpensize(5, share) self.setgray(100, share) self.setcolor(0, share) self.setshade(50, share) self.fill = False self.poly_points = [] for turtle_key in iter(self.tw.turtles.dict): # Don't reset remote turtles if not self.tw.remote_turtle(turtle_key): self.set_turtle(turtle_key) self.tw.active_turtle.set_color(0) self.tw.active_turtle.set_shade(50) self.tw.active_turtle.set_gray(100) self.tw.active_turtle.set_pen_size(5) self.tw.active_turtle.reset_shapes() self.seth(0, share) self.setpen(False, share) self.setxy(0, 0, share) self.setpen(True, share) self.tw.active_turtle.hide() self.set_turtle(self.tw.default_turtle_name) def forward(self, n, share=True): ''' Move the turtle forward.''' nn = n * self.tw.coord_scale self.canvas.set_source_rgb(self.fgrgb[0] / 255., self.fgrgb[1] / 255., self.fgrgb[2] / 255.) if self.cr_svg is not None: debug_output('in forward', True) self.cr_svg.set_source_rgb(self.fgrgb[0] / 255., self.fgrgb[1] / 255., self.fgrgb[2] / 255.) oldx, oldy = self.xcor, self.ycor try: self.xcor += nn * sin(self.heading * DEGTOR) self.ycor += nn * cos(self.heading * DEGTOR) except TypeError, ValueError: debug_output('bad value sent to %s' % (__name__), self.tw.running_sugar) return if self.pendown: self.draw_line(oldx, oldy, self.xcor, self.ycor) self.move_turtle() if self.tw.sharing() and share: event = 'f|%s' % (data_to_string([self._get_my_nick(), int(n)])) self.tw.send_event(event) self.inval() def seth(self, n, share=True): ''' Set the turtle heading. ''' try: self.heading = n except TypeError, ValueError: debug_output('bad value sent to %s' % (__name__), self.tw.running_sugar) return self.heading %= 360 self.turn_turtle() if self.tw.sharing() and share: event = 'r|%s' % (data_to_string([self._get_my_nick(), round_int(self.heading)])) self.tw.send_event(event) def right(self, n, share=True): ''' Rotate turtle clockwise ''' try: self.heading += n except TypeError, ValueError: debug_output('bad value sent to %s' % (__name__), self.tw.running_sugar) return self.heading %= 360 self.turn_turtle() if self.tw.sharing() and share: event = 'r|%s' % (data_to_string([self._get_my_nick(), round_int(self.heading)])) self.tw.send_event(event) def arc(self, a, r, share=True): ''' Draw an arc ''' self.canvas.set_source_rgb(self.fgrgb[0] / 255., self.fgrgb[1] / 255., self.fgrgb[2] / 255.) if self.cr_svg is not None: self.cr_svg.set_source_rgb(self.fgrgb[0] / 255., self.fgrgb[1] / 255., self.fgrgb[2] / 255.) try: if a < 0: self.larc(-a, r) else: self.rarc(a, r) except TypeError, ValueError: debug_output('bad value sent to %s' % (__name__), self.tw.running_sugar) return self.move_turtle() if self.tw.sharing() and share: event = 'a|%s' % (data_to_string([self._get_my_nick(), [round_int(a), round_int(r)]])) self.tw.send_event(event) def rarc(self, a, r): ''' draw a clockwise arc ''' r *= self.tw.coord_scale if r < 0: r = -r a = -a s = 0 else: s = 1 oldx, oldy = self.xcor, self.ycor cx = self.xcor + r * cos(self.heading * DEGTOR) cy = self.ycor - r * sin(self.heading * DEGTOR) if self.pendown: x, y = self.turtle_to_screen_coordinates(cx, cy) def _rarc(cr, x, y, r, a, h): cr.arc(x, y, r, (h - 180) * DEGTOR, (h - 180 + a) * DEGTOR) cr.stroke() _rarc(self.canvas, x, y, r, a, self.heading) self.inval() if self.cr_svg is not None: _rarc(self.cr_svg, x, y, r, a, self.heading) if self.fill: if self.poly_points == []: self.poly_points.append(('move', x, y)) self.poly_points.append(('rarc', x, y, r, (self.heading - 180) * DEGTOR, (self.heading - 180 + a) * DEGTOR)) self.right(a, False) self.xcor = cx - r * cos(self.heading * DEGTOR) self.ycor = cy + r * sin(self.heading * DEGTOR) def larc(self, a, r): ''' draw a counter-clockwise arc ''' r *= self.tw.coord_scale if r < 0: r = -r a = -a s = 1 else: s = 0 oldx, oldy = self.xcor, self.ycor cx = self.xcor - r * cos(self.heading * DEGTOR) cy = self.ycor + r * sin(self.heading * DEGTOR) if self.pendown: x, y = self.turtle_to_screen_coordinates(cx, cy) def _larc(cr, x, y, r, a, h): cr.arc_negative(x, y, r, h * DEGTOR, (h - a) * DEGTOR) cr.stroke() _larc(self.canvas, x, y, r, a, self.heading) self.inval() if self.cr_svg is not None: _larc(self.cr_svg, x, y, r, a, self.heading) if self.fill: if self.poly_points == []: self.poly_points.append(('move', x, y)) self.poly_points.append(('larc', x, y, r, (self.heading) * DEGTOR, (self.heading - a) * DEGTOR)) self.right(-a, False) self.xcor = cx + r * cos(self.heading * DEGTOR) self.ycor = cy - r * sin(self.heading * DEGTOR) def setxy(self, x, y, share=True, pendown=True): ''' Move turtle to position x,y ''' oldx, oldy = self.xcor, self.ycor x *= self.tw.coord_scale y *= self.tw.coord_scale try: self.xcor, self.ycor = x, y except TypeError, ValueError: debug_output('bad value sent to %s' % (__name__), self.tw.running_sugar) return if self.pendown and pendown: self.canvas.set_source_rgb(self.fgrgb[0] / 255., self.fgrgb[1] / 255., self.fgrgb[2] / 255.) if self.cr_svg is not None: self.cr_svg.set_source_rgb(self.fgrgb[0] / 255., self.fgrgb[1] / 255., self.fgrgb[2] / 255.) self.draw_line(oldx, oldy, self.xcor, self.ycor) self.inval() self.move_turtle() if self.tw.sharing() and share: event = 'x|%s' % (data_to_string([self._get_my_nick(), [round_int(x), round_int(y)]])) self.tw.send_event(event) def setpensize(self, ps, share=True): ''' Set the pen size ''' try: if ps < 0: ps = 0 self.pensize = ps except TypeError, ValueError: debug_output('bad value sent to %s' % (__name__), self.tw.running_sugar) return self.tw.active_turtle.set_pen_size(ps) self.canvas.set_line_width(ps) if self.cr_svg is not None: self.cr_svg.set_line_width(ps) if self.tw.sharing() and share: event = 'w|%s' % (data_to_string([self._get_my_nick(), round_int(ps)])) self.tw.send_event(event) def setcolor(self, c, share=True): ''' Set the pen color ''' try: self.color = c except TypeError, ValueError: debug_output('bad value sent to %s' % (__name__), self.tw.running_sugar) return self.tw.active_turtle.set_color(c) self.set_fgcolor() if self.tw.sharing() and share: event = 'c|%s' % (data_to_string([self._get_my_nick(), round_int(c)])) self.tw.send_event(event) def setgray(self, g, share=True): ''' Set the gray level ''' try: self.gray = g except TypeError, ValueError: debug_output('bad value sent to %s' % (__name__), self.tw.running_sugar) return if self.gray < 0: self.gray = 0 if self.gray > 100: self.gray = 100 self.set_fgcolor() self.tw.active_turtle.set_gray(self.gray) if self.tw.sharing() and share: event = 'g|%s' % (data_to_string([self._get_my_nick(), round_int(self.gray)])) self.tw.send_event(event) def set_textcolor(self): ''' Deprecated: Set the text color to foreground color. ''' return def settextcolor(self, c): # deprecated ''' Set the text color ''' return def settextsize(self, c): # deprecated ''' Set the text size ''' try: self.tw.textsize = c except TypeError, ValueError: debug_output('bad value sent to %s' % (__name__), self.tw.running_sugar) def setshade(self, s, share=True): ''' Set the color shade ''' try: self.shade = s except TypeError, ValueError: debug_output('bad value sent to %s' % (__name__), self.tw.running_sugar) return self.tw.active_turtle.set_shade(s) self.set_fgcolor() if self.tw.sharing() and share: event = 's|%s' % (data_to_string([self._get_my_nick(), round_int(s)])) self.tw.send_event(event) def fillscreen(self, c, s): ''' Deprecated method: Fill screen with color/shade ''' self.fillscreen_with_gray(c, s, self.gray) def fillscreen_with_gray(self, c, s, g): ''' Fill screen with color/shade/gray and reset to defaults ''' oldc, olds, oldg = self.color, self.shade, self.gray self.setcolor(c, False) self.setshade(s, False) self.setgray(g, False) self.bgrgb = self.fgrgb[:] def _fillscreen(cr, rgb, w, h): cr.set_source_rgb(rgb[0] / 255., rgb[1] / 255., rgb[2] / 255.) cr.rectangle(0, 0, w * 2, h * 2) cr.fill() _fillscreen(self.canvas, self.fgrgb, self.width, self.height) self.inval() if self.cr_svg is not None: _fillscreen(self.cr_svg, self.fgrgb, self.width, self.height) self.setcolor(oldc, False) self.setshade(olds, False) self.setgray(oldg, False) self.fill = False self.poly_points = [] def set_fgcolor(self): ''' Set the foreground color ''' if self.color == WHITE or self.shade == WHITE: r = 0xFF00 g = 0xFF00 b = 0xFF00 self.color = 0 self.shade = 100 self.gray = 0 elif self.color == BLACK or self.shade == BLACK: r = 0x0000 g = 0x0000 b = 0x0000 self.color = 0 self.shade = 0 self.gray = 0 else: sh = (wrap100(self.shade) - 50) / 50.0 rgb = COLOR_TABLE[wrap100(self.color)] r = (rgb >> 8) & 0xff00 r = calc_gray(r, self.gray) r = calc_shade(r, sh) g = rgb & 0xff00 g = calc_gray(g, self.gray) g = calc_shade(g, sh) b = (rgb << 8) & 0xff00 b = calc_gray(b, self.gray) b = calc_shade(b, sh) self.fgrgb = [r >> 8, g >> 8, b >> 8] def setpen(self, bool, share=True): ''' Lower or raise the pen ''' self.pendown = bool self.tw.active_turtle.set_pen_state(bool) if self.tw.sharing() and share: event = 'p|%s' % (data_to_string([self._get_my_nick(), bool])) self.tw.send_event(event) def draw_surface(self, surface, x, y, w, h): ''' Draw a surface ''' def _draw_surface(cr, surface, x, y, w, h): cc = gtk.gdk.CairoContext(cr) cc.set_source_surface(surface, x, y) cc.rectangle(x, y, w, h) cc.fill() _draw_surface(self.canvas, surface, x, y, w, h) self.inval() if self.cr_svg is not None: _draw_surface(self.cr_svg, surface, x, y, w, h) def draw_pixbuf(self, pixbuf, a, b, x, y, w, h, path, share=True): ''' Draw a pixbuf ''' def _draw_pixbuf(cr, pixbuf, a, b, x, y, w, h, heading): # Build a gtk.gdk.CairoContext from a cairo.Context to access # the set_source_pixbuf attribute. cc = gtk.gdk.CairoContext(cr) cc.save() # center the rotation on the center of the image cc.translate(x + w / 2., y + h / 2.) cc.rotate(heading * DEGTOR) cc.translate(-x - w / 2., -y - h / 2.) cc.set_source_pixbuf(pixbuf, x, y) cc.rectangle(x, y, w, h) cc.fill() cc.restore() _draw_pixbuf(self.canvas, pixbuf, a, b, x, y, w, h, self.heading) self.inval() if self.cr_svg is not None: _draw_pixbuf(self.cr_svg, pixbuf, a, b, x, y, w, h, self.heading) if self.tw.sharing() and share: if self.tw.running_sugar: tmp_path = get_path(self.tw.activity, 'instance') else: tmp_path = '/tmp' tmp_file = os.path.join(get_path(self.tw.activity, 'instance'), 'tmpfile.png') pixbuf.save(tmp_file, 'png', {'quality': '100'}) data = image_to_base64(tmp_file, tmp_path) height = pixbuf.get_height() width = pixbuf.get_width() x, y = self.screen_to_turtle_coordinates(x, y) event = 'P|%s' % (data_to_string([self._get_my_nick(), [round_int(a), round_int(b), round_int(x), round_int(y), round_int(w), round_int(h), round_int(width), round_int(height), data]])) gobject.idle_add(self.tw.send_event, event) os.remove(tmp_file) def draw_text(self, label, x, y, size, w, share=True): ''' Draw text ''' w *= self.tw.coord_scale def _draw_text(cr, label, x, y, size, w, scale, heading, rgb): cc = pangocairo.CairoContext(cr) pl = cc.create_layout() fd = pango.FontDescription('Sans') fd.set_size(int(size * scale) * pango.SCALE) pl.set_font_description(fd) if type(label) == str or type(label) == unicode: pl.set_text(label.replace('\0', ' ')) elif type(label) == float or type(label) == int: pl.set_text(str(label)) else: pl.set_text(str(label)) pl.set_width(int(w) * pango.SCALE) cc.save() cc.translate(x, y) cc.rotate(heading * DEGTOR) cr.set_source_rgb(rgb[0] / 255., rgb[1] / 255., rgb[2] / 255.) cc.update_layout(pl) cc.show_layout(pl) cc.restore() _draw_text(self.canvas, label, x, y, size, w, self.tw.coord_scale, self.heading, self.fgrgb) self.inval() if self.cr_svg is not None: # and self.pendown: _draw_text(self.cr_svg, label, x, y, size, w, self.tw.coord_scale, self.heading, self.fgrgb) if self.tw.sharing() and share: event = 'W|%s' % (data_to_string([self._get_my_nick(), [label, round_int(x), round_int(y), round_int(size), round_int(w)]])) self.tw.send_event(event) def turtle_to_screen_coordinates(self, x, y): ''' The origin of turtle coordinates is the center of the screen ''' return self.width / 2. + x, self.invert_y_coordinate(y) def screen_to_turtle_coordinates(self, x, y): ''' The origin of the screen coordinates is the upper left corner ''' return x - self.width / 2., self.invert_y_coordinate(y) def invert_y_coordinate(self, y): ''' Positive y goes up in turtle coordinates, down in sceeen coordinates ''' return self.height / 2. - y def draw_line(self, x1, y1, x2, y2): ''' Draw a line ''' x1, y1 = self.turtle_to_screen_coordinates(x1, y1) x2, y2 = self.turtle_to_screen_coordinates(x2, y2) def _draw_line(cr, x1, y1, x2, y2): cr.move_to(x1, y1) cr.line_to(x2, y2) cr.stroke() _draw_line(self.canvas, x1, y1, x2, y2) if self.cr_svg is not None: _draw_line(self.cr_svg, x1, y1, x2, y2) if self.fill: if self.poly_points == []: self.poly_points.append(('move', x1, y1)) self.poly_points.append(('line', x2, y2)) def turn_turtle(self): ''' Change the orientation of the turtle ''' self.tw.active_turtle.set_heading(self.heading) def move_turtle(self): ''' Move the turtle ''' x, y = self.turtle_to_screen_coordinates(self.xcor, self.ycor) if self.tw.interactive_mode: self.tw.active_turtle.move( (int(self.cx + x - self.tw.active_turtle.spr.rect.width / 2.), int(self.cy + y - self.tw.active_turtle.spr.rect.height / 2.)) ) else: self.tw.active_turtle.move((int(self.cx + x), int(self.cy + y))) def get_color_index(self, r, g, b, a=0): ''' Find the closest palette entry to the rgb triplet ''' if self.shade != 50 or self.gray != 100: r <<= 8 g <<= 8 b <<= 8 if self.shade != 50: sh = (wrap100(self.shade) - 50) / 50. r = calc_shade(r, sh, True) g = calc_shade(g, sh, True) b = calc_shade(b, sh, True) if self.gray != 100: r = calc_gray(r, self.gray, True) g = calc_gray(g, self.gray, True) b = calc_gray(b, self.gray, True) r >>= 8 g >>= 8 b >>= 8 min_distance = 1000000 closest_color = -1 for i, c in enumerate(COLOR_TABLE): cr = int((c & 0xff0000) >> 16) cg = int((c & 0x00ff00) >> 8) cb = int((c & 0x0000ff)) distance_squared = \ ((cr - r) ** 2) + ((cg - g) ** 2) + ((cb - b) ** 2) if distance_squared == 0: return i if distance_squared < min_distance: min_distance = distance_squared closest_color = i return closest_color def get_pixel(self): ''' Read the pixel at x, y ''' if self.tw.interactive_mode: x, y = self.turtle_to_screen_coordinates(self.xcor, self.ycor) x = int(x) y = int(y) w = self.tw.turtle_canvas.get_width() h = self.tw.turtle_canvas.get_height() if x < 0 or x > (w - 1) or y < 0 or y > (h - 1): return(-1, -1, -1, -1) # create a new 1x1 cairo surface cs = cairo.ImageSurface(cairo.FORMAT_RGB24, 1, 1) cr = cairo.Context(cs) cr.set_source_surface(self.tw.turtle_canvas, -x, -y) cr.rectangle(0, 0, 1, 1) cr.set_operator(cairo.OPERATOR_SOURCE) cr.fill() cs.flush() # ensure all writing is done pixels = cs.get_data() # Read the pixel return (ord(pixels[2]), ord(pixels[1]), ord(pixels[0]), 0) else: return(-1, -1, -1, -1) def set_turtle(self, k, colors=None): ''' Select the current turtle and associated pen status ''' if k not in self.tw.turtles.dict: # if it is a new turtle, start it in the center of the screen self.tw.active_turtle = self.tw.turtles.get_turtle(k, True, colors) self.seth(0, False) self.setxy(0, 0, False, pendown=False) self.tw.active_turtle.set_pen_state(True) elif colors is not None: self.tw.active_turtle = self.tw.turtles.get_turtle(k, False) self.tw.active_turtle.set_turtle_colors(colors) else: self.tw.active_turtle = self.tw.turtles.get_turtle(k, False) self.tw.active_turtle.show() tx, ty = self.tw.active_turtle.get_xy() self.xcor, self.ycor = self.screen_to_turtle_coordinates(tx, ty) if self.tw.interactive_mode: self.xcor += self.tw.active_turtle.spr.rect.width / 2. self.ycor -= self.tw.active_turtle.spr.rect.height / 2. self.heading = self.tw.active_turtle.get_heading() self.setcolor(self.tw.active_turtle.get_color(), False) self.setgray(self.tw.active_turtle.get_gray(), False) self.setshade(self.tw.active_turtle.get_shade(), False) self.setpensize(self.tw.active_turtle.get_pen_size(), False) self.setpen(self.tw.active_turtle.get_pen_state(), False) def svg_close(self): ''' Close current SVG graphic ''' self.cr_svg.show_page() def svg_reset(self): ''' Reset svg flags ''' self.cr_svg = None def _get_my_nick(self): return self.tw.nick def inval(self): ''' Invalidate a region for gtk ''' self.tw.inval_all()