Jump square on Gamebuino META in Python

code.py

from gamebuino_meta import begin, waitForUpdate, display, color, buttons

# **********************************************************************
# Global variables

# Size of character
WIDTH_CHARACTER         = 2
HEIGHT_CHARACTER        = 2

# State of character
ON_THE_PLATFORM_STATE   = 0
FREE_FALL_STATE         = 1
PUSH_FOR_JUMP_STATE     = 2
JUMP_STATE              = 3

# Platform ID
NO_ID                   = 0
ID_GROUND               = 1

# Gravity
GRAVITY                 = 2

# Settings of jumps
HORIZONTAL_VELOCITY     = 3
INIT_VERTICAL_VELOCITY  = 10

# **********************************************************************
# Character management

def moveAtLeft():
	xOld = character['x']
	#if xOld > 0 :
	if not (character['x'] <= 0) :
		# Move character at left only if in the size of the screen
		character['x'] = xOld - 1
		character['vx'] = (-1 * HORIZONTAL_VELOCITY)

def moveAtRight():
	xOld = character['x']
	#if (xOld + WIDTH_CHARACTER) < display.width() :
	if not (character['x'] >= (display.width() - WIDTH_CHARACTER)) :
		# Move character at right only if in the size of the screen
		character['x'] = xOld + 1
		character['vx'] = HORIZONTAL_VELOCITY

def isOnOnePlatform():
	return ID_GROUND if ((character['y'] + character['vy']) >= (display.height() - HEIGHT_CHARACTER)) else NO_ID

def isOutOfWorld():
	if character['x'] <= 0 :
		character['x'] = 0
		return True
	elif character['x'] >= (display.width() - WIDTH_CHARACTER) :
		character['x'] = (display.width() - WIDTH_CHARACTER)
		return True
	return False

# **********************************************************************
# Physics engine

def jumpMovement():
	character['oldY'] = character['y']
	character['vy'] = character['vy'] + GRAVITY
	character['x'] = character['x'] + character['vx']
	character['y'] = character['y'] + character['vy']

def jump():
	platformID = isOnOnePlatform()
	if character['state'] == PUSH_FOR_JUMP_STATE :
		character['vy'] = character['vy'] - INIT_VERTICAL_VELOCITY
		character['state'] = JUMP_STATE
		jumpMovement()
	elif not ( platformID == NO_ID ) :
		character['vy'] = 0
		character['state'] = ON_THE_PLATFORM_STATE
	elif isOutOfWorld() :
		character['state'] = FREE_FALL_STATE
	else:
		jumpMovement()

def gravity():
	platformID = isOnOnePlatform()
	if platformID == NO_ID :
		# Free fall
		character['oldY'] = character['y']
		character['vy'] = character['vy'] + GRAVITY
		character['y'] = character['y'] + character['vy']
		character['state'] = FREE_FALL_STATE
	else:
		character['vy'] = 0
		character['state'] = ON_THE_PLATFORM_STATE

# **********************************************************************
# Game management

def tick():
	# Manage buttons
	handleButtons()
	# Manage physics
	if character['state'] == FREE_FALL_STATE :
		gravity()
	elif character['state'] == JUMP_STATE or character['state'] == PUSH_FOR_JUMP_STATE :
		jump()
	# Clear screen
	display.clear()
	# Draw character
	display.fillRect(character['x'], character['y'], WIDTH_CHARACTER, HEIGHT_CHARACTER)

def handleButtons():
	character['vx'] = 0
	if buttons.repeat(buttons.LEFT, 1) :
		moveAtLeft()
	elif buttons.repeat(buttons.RIGHT, 1) :
		moveAtRight()
	if buttons.pressed(buttons.A) and not ( character['state'] == JUMP_STATE ) :
		character['state'] = PUSH_FOR_JUMP_STATE

# **********************************************************************
# Variables of program

character = {
	'x': ((display.width() - WIDTH_CHARACTER) // 2),
	'y': (display.height() - HEIGHT_CHARACTER),
	'oldY': (display.height() - HEIGHT_CHARACTER),
	'vx': 0,
	'vy': 0,
	'state': ON_THE_PLATFORM_STATE
}

# **********************************************************************
# Initialization

begin()

# **********************************************************************
# Main loop

while True:
	waitForUpdate()
	tick()