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How to create a basic Langton’s Ant animation? how i set or find 'p' . SEE my ??? need help how to do this part

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Rosendo Ramos
Rosendo Ramos 2020-10-12
code:
% antdirection: 0 = east
% 90 = north
% 180 = west
% 270 = south
%
% gridcolor: 0 = white
% 1 = black
clear
close all
% initialize grid to all zeros (i.e., white)
gridcolor = zeros(100,100);
% specify the bounds of the grid
x_min = 1; x_max = 100;
y_min = 1; y_max = 100;
% initialize ant position to the middle of the grid
ant_x = 50;
ant_y = 50;
% initialize the ant direction to east
antdirection = 0;
% create initial plot with handle 'p', specifying the x and y values as
% ant_x and ant_y, set the marker type as a square and set erasemode to
% none so that all points are shown
p = ????????????;
% Set plot axis to span the grid
axis([0 100 0 100])
% specify the loop variable to indicate if the ant is still inside the grid
inside = 1;
% count the number of steps needed to reach the edge of the grid
total_steps = 0;
while inside == 1,
total_steps = total_steps + 1;
if gridcolor(ant_x,ant_y) == 0, % if the square is white, then
antdirection = antdirection + 90; % turn 90 deg to the right
else % otherwise the square is black, so
antdirection = antdirection - 90; % turn 90 deg to the left
end
% check antdirection and modify if necessary to keep it in the range of
% 0 to 360 degrees
if antdirection >= 360,
antdirection = antdirection - 360;
elseif antdirection < 0,
antdirection = antdirection + 360;
end
% the ant always flips the color of the square that it is on
gridcolor(ant_x,ant_y) = ~gridcolor(ant_x,ant_y);
if gridcolor(ant_x,ant_y) == 0, % if the grid square is white, then
% set the Marker edge and face color to white for the x,y point
set(p,??????????
else % the grid square is black, so
% set the Marker edge and face color to black for the x,y point
set(p,??????????
end
??????? % execute the graphics set immediately above
% determine the x and y direction of the ant motion (i.e., the position
% change for each coordinate)
ant_motion_x = cosd(antdirection);
ant_motion_y = sind(antdirection);
% move the ant to the next square
ant_x = ant_x + ant_motion_x;
ant_y = ant_y + ant_motion_y;
% determine if the ant has move outside the grid; if so, set inside to
% 0 so that the loop terminates
if (ant_x<x_min) || (ant_x>x_max),
inside = 0;
elseif (ant_y<y_min) || (ant_y>y_max),
inside = 0;
end
end

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