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Diffstat (limited to 'TurtleArt/tacanvas.py')
| -rw-r--r-- | TurtleArt/tacanvas.py | 777 |
1 files changed, 777 insertions, 0 deletions
diff --git a/TurtleArt/tacanvas.py b/TurtleArt/tacanvas.py new file mode 100644 index 0000000..246fe35 --- /dev/null +++ b/TurtleArt/tacanvas.py @@ -0,0 +1,777 @@ +#Copyright (c) 2007-8, Playful Invention Company. +#Copyright (c) 2008-11, Walter Bender +#Copyright (c) 2011 Collabora Ltd. <http://www.collabora.co.uk/> + +#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 +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, 255, 255] + 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, 255, 255] + 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): + ''' Fill screen with color/shade and reset to defaults ''' + oldc, olds = self.color, self.shade + self.setcolor(c, False) + self.setshade(s, 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.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 + elif self.color == BLACK or self.shade == BLACK: + r = 0x0000 + g = 0x0000 + b = 0x0000 + 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]])) + 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() |