Creating the Snake game using a classdef

I'm having trouble making the Snake game using a class def, my code just continously loops & keeps recreating the graph. I'm stuck & don't know what I need to do to be able to fix the graph issue & make the snake move.

classdef snake < handle
    properties
        gameinput = 'k';
        player1 = [];
        board = [];
        lose = [];
        character = 1;
        ex = 0;
    end
    
    methods
        %constructor
        function self = snake(varargin)
            if ~isempty(varargin)
                self.gameinput = varargin{1}
                if nargin > 1
                    self.player1 = varargin{2};
                end
            end
        end
        
        %controls game flow
        function play(self)
            if isempty(self.lose)
                draw_board(self)
            end
        end
        
        %creates game board
        function draw_board(self)
            axis_limit = 16;
            d = 0;
            ate = 0;
            x = round(axis_limit/2); %starting point
            y = round(axis_limit/2); %starting point
            a =randi([1 axis_limit-1],1);%generates random x coordinate for food
            b =randi([1 axis_limit-1],1);%generates random y coordinate for food
            d =randi([1,4]);% generates random direction to start in for snake
            snake(1,1:2)=[x y];%defines the snake for x and y coordinates
            size_snake=size(snake);
            size_snake=size_snake(1);
            food = [a b]; %defines coords for the food
            test
            
 
            while (self.ex~=1)%runs the snake as long as q is not pressed
                size_snake=size(snake);
                size_snake=size_snake(1);
                for l=size_snake+ate:-1:2
                    snake(l,:)=snake(l-1,:);
                end
                switch d         %calling callback function
                    case 1
                        snake(1,2)=snake(1,2)+1;%add value of 1 to y position
                    case 2
                        snake(1,2)=snake(1,2)-1;%subtract value of 1 to y position
                    case 3
                        snake(1,1)=snake(1,1)+1;%add value of 1 to x position
                    case 4
                        snake(1,1)=snake(1,1)-1;%subtracts value of 1 to x position
                end
                draw_snake(self)
                if snake(1,1)==food(1) && snake(1,2)==food(2)%if the snake and food are in the same position
                    ate=1;
                    food(1) = randi([1 axis_limit-1]);%creates a new x position for the food
                    food(2) = randi([1 axis_limit-1]);%creates a new y position for the food
                else
                    ate=0;
                end
                snake=snake-((snake>axis_limit).*(axis_limit+1));
                snake=snake+((snake<0).*(axis_limit+1));
            end
        end
        
        function draw_snake(self)
            axis_limit = 8;
            d = 0;
            ate = 0;
            x = round(axis_limit/2); %starting point
            y = round(axis_limit/2); %starting point
            a =randi([1 axis_limit-1],1);%generates random x coordinate for food
            b =randi([1 axis_limit-1],1);%generates random y coordinate for food
            d =randi([1,4]);% generates random direction to start in for snake
            snake(1,1:2)=[x y];%defines the snake for x and y coordinates
            food = [a b]; %defines coords for the food
            size_snake=size(snake);
            size_snake=size_snake(1);
            for p = 1:size_snake
                plot(snake(p,1),snake(p,2), 'wo')
                hold on
            end
            plot(food(1,1),food(1,2), 'rs')%creates the vectors for the food and snake and plots them
            drawnow
            whitebg([0 0 0])%creates black background
            axis([0, axis_limit, 0, axis_limit])%creates the axis for gameplay
            hold off
        end
        
        %controls the movement of the snake
        function move_snake(self)
            switch self.character
                case 'q'
                    self.ex=1;
                case 30               % arrow direction
                    if(d~=2)
                        d = 1;              %up d=1
                    end
                case 31
                    if(d~=1)
                        d = 2;              %down d=2
                    end
                case 29
                    if(d~=4)
                        d = 3;              %right d=3
                    end
                case 28
                    if(d~=3)
                        d = 4;              %left d=4
                    end
            end
        end
    end
end

[TADA]

what input do you suply the ctor, and how do you operate this class to run your game?

[TADA]

thats offtopic but,

in play function you have two identical calls to draw_board, when the player lost, you call it as function notation, and then call it with indexing notation regardless

both function notation

draw_board(self)

and dot indexing

self.draw_board() % or self.draw_board which also invokes the function

generally do the same thing. The mechanisms are different, but the outcome is identical, that is, both notations invoke the draw_board function of your snake class with self as an argument.

[Landon Duke]

Okay, thank you TADA, I deleted the 'self.draw_board' since it was redundent.

Answer 1

[Gareth]

Try adding

drawnow

after the plot.

[Landon Duke]

This got the plot to display, thank you

[Matt J]

@Landon, If the answer resolved your issue, then you should Accept-click it.