smallbasic.github.io/samples/node/1360.bas at master · smallbasic/smallbasic.github.io · GitHub

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' falling blocks - tetris clone

option predef grmode 300x300

' cell size in pixels

const c_w = 10

const c_h = 10

' board position

const b_x = 40

const b_y = 10

' board size

const b_w = 12

const b_h = 28

' board color

const b_col = rgb(111,199,222)

' the number of available play blocks

const num_blocks = 5

' holder for board pieces

dim blocks(0 to num_blocks - 1)

' remember used positions

dim board(0 to b_w - 1, 0 to b_h - 1)

' event loop delay factor

drop_speed = 300

' whether the game is over

game_over = false

' number of played shapes

num_shapes = 0

' number of completed rows

num_rows = 0

' block, rotation, x+y coordinates on the game board

sub draw_block(b, r, pos_x, pos_y, c)

local x, y, px, py

for x = 0 to 3

for y = 0 to 3

if b(r)(x, y) = 1 then

px = b_x + ((pos_x + x) * c_w)

py = b_y + ((pos_y + y) * c_h)

rect px, py, step c_w, c_h, c filled

next y

next x

SHOWPAGE

end

' show the given block

sub show_block(block)

draw_block block.b, block.r, block.x, block.y, block.col

end

' erase the given block

sub hide_block(block)

draw_block block.b, block.r, block.x, block.y, b_col

end

' returns the right edge of the given block

func right_edge(block)

local x, y, r

r = block.r

for x = 3 to 0 step -1

for y = 0 to 3

if block.b(r)(x, y) = 1 then

right_edge = x + 1

exit func

next y

next x

end

' create one of the four block rotations

func create_cell

local x, y, result

dim result(0 to 3, 0 to 3)

for y = 0 to 3

for x = 0 to 3

read result(x, y)

next x

next y

create_cell = result

end

' creates 4 rotations of a 4 x 4 pattern. address like this: b(0)(1,1)

func create_block

local i, result

dim result(0 to 3)

for i = 0 to 3

result(i) = create_cell

next i

create_block = result

end

' draw the board outline

sub draw_board(x1, y1)

local w = b_w * c_w

local h = b_h * c_h

rect x1, y1, step w, h, b_col filled

local x, y, px, py

for y = b_h -1 to 0 step -1

for x = 0 to b_w -1

if (board(x, y) != 0) then

px = x1 + (x * c_w)

py = y1 + (y * c_h)

rect px, py, step c_w, c_h, board(x, y) filled

next x

next y

end

' creates a new active block

func next_block

local i = int(rnd * num_blocks)

result.b = blocks(i)

result.r = int(rnd * 4)

result.col = i + 2

result.x = b_w / 2

result.y = 0

show_block result

num_shapes++

next_block = result

end

' prepare the game board

sub init_game

local i, x, y

' create the blocks

for i = 0 to num_blocks - 1

blocks(i) = create_block

next i

' setup the bottom boundary holder

for x = 0 to b_w - 1

for y = 0 to b_h - 1

board(x, y) = 0

next y

next x

draw_board b_x, b_y

randomize timer

end

' handle row completion

func row_completed

local x, y, n, x2, y2

row_completed = 0

for y = b_h -1 to 0 step -1

n = 0

for x = 0 to b_w -1

if (board(x, y) != 0) then

n++

next x

if (n == b_w) then

' erase the completed row

for y2 = y to 1 step -1

for x2 = 0 to b_w - 1

board(x2, y2) = board(x2, y2 - 1)

next x2

next y2

' clear the top row

for x2 = 0 to b_w - 1

board(x2, 0) = 0

next x2

y += 1 'next row now in y

row_completed = 1

next y

end

' whether the block can move any further down

func is_bottom(block)

local x, y

local br = block.r

local bx = block.x

local by = block.y

local touch = false

for y = 3 to 0 step -1

for x = 0 to 3

if (block.b(br)(x, y) = 1 && &

(by + y + 1 == b_h || board(bx + x, by + y + 1) != 0)) then

touch = true

next x

next y

if (touch) then

' check for end of game

for y = 3 to 0 step -1

for x = 0 to 3

if (block.b(br)(x, y) = 1) then

if (by == 0 || (by < 4 && board(bx + x, by + y) != 0)) then

game_over = true

exit func

next x

next y

' record the resting position on the board

for y = 3 to 0 step -1

for x = 0 to 3

if (block.b(br)(x, y) = 1) then

board(bx + x, by + y) = block.col

next x

next y

is_bottom = touch

end

' update the block position by the given offsets

sub moveBlock(x, y)

hide_block block

block.x += x

block.y += y

show_block block

end

' move the block left

sub moveLeft

if (block.x > 0) then

moveBlock -1, 0

end

' move the block right

sub moveRight

if ((block.x + right_edge(block)) < b_w) then

moveBlock 1, 0

end

' rotate the block

sub moveRotate

hide_block block

block.r = iff(block.r == 3, 0, block.r+1)

' ensure rotation doesn't extend beyond board

while ((block.x + right_edge(block)) > b_w)

block.x --

wend

show_block block

end

' drop the block

sub dropBlock

while !is_bottom(block)

moveBlock 0, 1

wend

end

' show game statistics

sub show_stats

at b_x + (b_w * c_w) + 10, b_y: ? "Shapes:"; num_shapes

at b_x + (b_w * c_w) + 10, b_y+20: ? "Rows:"; num_rows

at b_x + (b_w * c_w) + 10, b_y+40: ? "Speed:"; drop_speed

end

' main game loop

sub play_game

block = next_block

show_stats

while game_over = false

delay drop_speed

' check for collision

if is_bottom(block) then

show_block block 'show final position

erase block

if row_completed then

num_rows++

draw_board b_x, b_y

drop_speed -= 20

block = next_block

show_stats

else

' drop the block down one position

moveBlock 0, 1

wend

end

defineKey 0xFF04, moveLeft

defineKey 0xFF05, moveRight

defineKey 0xFF09, moveRotate

defineKey asc(" "), dropBlock

init_game

play_game

' define the game pieces

'block 1 - bar

data 1,0,0,0, 1,0,0,0, 1,0,0,0, 1,0,0,0

data 1,1,1,1, 0,0,0,0, 0,0,0,0, 0,0,0,0

data 1,0,0,0, 1,0,0,0, 1,0,0,0, 1,0,0,0

data 1,1,1,1, 0,0,0,0, 0,0,0,0, 0,0,0,0

'block 2 - elbow

data 1,0,0,0, 1,0,0,0, 1,1,0,0, 0,0,0,0

data 1,1,1,0, 1,0,0,0, 0,0,0,0, 0,0,0,0

data 0,1,1,0, 0,0,1,0, 0,0,1,0, 0,0,0,0

data 0,0,0,0, 0,0,1,0, 1,1,1,0, 0,0,0,0

'block 3 - tee

data 1,1,1,0, 0,1,0,0, 0,0,0,0, 0,0,0,0

data 0,1,0,0, 1,1,0,0, 0,1,0,0, 0,0,0,0

data 0,1,0,0, 1,1,1,0, 0,0,0,0, 0,0,0,0

data 1,0,0,0, 1,1,0,0, 1,0,0,0, 0,0,0,0

'block 4 - cube

data 1,1,0,0, 1,1,0,0, 0,0,0,0, 0,0,0,0

'block 5 - s-bend

data 1,1,0,0, 0,1,1,0, 0,0,0,0, 0,0,0,0

data 0,1,0,0, 1,1,0,0, 1,0,0,0, 0,0,0,0

data 1,1,0,0, 0,1,1,0, 0,0,0,0, 0,0,0,0

data 0,1,0,0, 1,1,0,0, 1,0,0,0, 0,0,0,0

smallbasic.github.io/samples/node/1360.bas at master · smallbasic/smallbasic.github.io · GitHub

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