ALEX STROUD - Snake Progress

Snake Progress

Nov 1, 2017. | By: Alex Stroud
2 mins

Snake Game Progress I have nearly finished the core loop of the snake game and am currently in the process of getting my sprites to display inside the ASGE before adding the finishing touch of movement. I have several different classes that helps separate out the project into specific areas. There is a snake class and a class for the snake segments. Each segment piece will hold several types of details including it’s own current direction it’s facing in, the type of piece it is (Head, body or tail), and details of what segment is in front of it and behind it to help it with moving around corners. This is done through the use of pointers for each segment that get passed to the next one along so that each one will know the details of the segment in front of itself. This means that then each segment will be able to work out how it has to reposition itself in accordance with the position and other details of the segment in front.

Currently I am having a few issues with the engine in trying to get objects to actually display. However I believe that once I’ve sorted this issue, it should be easy to just implement in the movement for the snake. Below you can see the pseudocode for some of the functions I have already created.

Setting up the border

This is the general pseudo for how the game will set up the border around where the game is played. For each of the positions, it will assign an enum value that will later be assigned to the correct sprite.

for loop from i=1 to height-2 (down the rows excluding corners)
{
	(0,i) =  Pipe_vertical
	(width-1,i) = Pipe_vertical
}
for loop from j=1 to width-2 (across the columns excluding corners)
{
	(i,0) = Pipe_horizontal
	(i,height-1) = Pipe_horizontal 
}
left top corner -(0,0) = top left sprite 
right top corner - (width-1,0) = top right sprite
left bottom corner - (0, height-1) = bot left sprite
right bottom corner - (width-1,height-1) = bot right sprite

Checking for food at position

This function is used for checking whether there is food at a given co-ordinate location. Will likely be used for checking the position in front of where the head currently is.

Passed in parameters of (x,y)
if x = food_x_coord and  y = food_y_coord and current_type != NONE
	return true
else
	return false

Checking Snake collision

This function will be used for general collision and may be used in multiple situations. It returns the contents of the cell in front of where the head is currently positioned and where it is facing.

Find where the front of the snake is using the segment pointer that is part of the class (pointing to the head of the snake)
head_x = head->getSegCoordX
head_y=head->getSegCoordY
head_dir=head->getSegDirection

switch (head_dir)
case UP
	(head_x,head_y-1)
	coord_to_check_x = head_x
	coord_to_check_y=head_y - 1
case DOWN
	(head_x,head_y+1)
	coord_to_check_x = head_x
	coord_to_check_y=head_y
case LEFT
	(head_x-1,head_y)
	coord_to_check_x = head_x
	coord_to_check_y=head_y
case RIGHT
	(head_x+1,head_y)
	coord_to_check_x = head_x
	coord_to_check_y=head_y

Board::coordContents(coord_to_check_x, coord_to_check_y)
returns contents of cell in front of character

Snake Progress

Snake Progress

Setting up the border

Checking for food at position

Checking Snake collision

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