9) Building Real Model

In real car does not move in such manner . We must apply some of the math we read in school to have work it like real life.

(adsbygoogle = window.adsbygoogle || []).push({});

We only apply orientation and acceleration as forward to the car . But how can we move our car in real manner see the code below, if you didn't get it contact me.

	def move(self, turn, forward):
		self.orientation = self.orientation + turn
		#cos value 0degree->1 , 90degree->0, 180degree->-1
		#we must pass degree in radian
		self.x = self.x + forward*cos(self.orientation*pi/180)
		#sin value 0degree->0 , 90degree->1, 180degree->0
		#we must pass degree in radian
		self.y = self.y - forward*sin(self.orientation*pi/180)

10) Move within the boundary

		self.orientation %= 360
		self.x %= world_size
		self.y %= world_size

The above code simply bound robot inside window i.e robot will come out of opposite side if it crossover one of the side .

Final Code

(adsbygoogle = window.adsbygoogle || []).push({});

import pygame
from math import *


"""Define color"""
red = (200, 0, 0)
blue = (0, 0, 255)
green = (0, 155, 0)
yellow = (155, 155, 0)
white = (255, 255, 255)
black = (0, 0, 0)


display_width = 800
display_height = 800
world_size = display_width

class robot:
	def __init__(self):
		self.x = 0
		self.y = 0
		self.orientation = 0

	def set(self, x, y,orientation):
		self.x = x
		self.y = y
		self.orientation = orientation

	def move(self, turn, forward):
		self.orientation = self.orientation + turn
		#cos value 0degree->1 , 90degree->0, 180degree->-1
		#we must pass degree in radian
		self.x = self.x + forward*cos(self.orientation*pi/180)
		#sin value 0degree->0 , 90degree->1, 180degree->0
		#we must pass degree in radian
		self.y = self.y - forward*sin(self.orientation*pi/180)
		
		self.orientation %= 360
		self.x %= world_size
		self.y %= world_size
		
	def draw(self):
		car_img = pygame.image.load("car60_40.png")
		img = pygame.transform.rotate(car_img, self.orientation)
		print self.orientation
		screen.blit(img, (self.x, self.y))

class Simulator(object):
	def main(self , screen , robot):
		clock = pygame.time.Clock()
		robot.draw()
		delta_orient = 0.0
		delta_forward = 0.0
		while 1:
			clock.tick(30)
			screen.fill(white)
			for event in pygame.event.get():
				if event.type == pygame.QUIT:
					return
				if event.type == pygame.KEYDOWN:
					if event.key == pygame.K_LEFT:
						delta_orient = 1
					elif event.key == pygame.K_RIGHT:
						delta_orient = -1
					elif event.key == pygame.K_UP:
						delta_forward = 1
					elif event.key == pygame.K_DOWN:
						delta_forward = -1
				elif event.type == pygame.KEYUP:
					if event.key == pygame.K_RIGHT or event.key == pygame.K_LEFT or event.key == pygame.K_UP or event.key == pygame.K_DOWN:
						delta_orient = 0.0
						delta_forward = 0.0

			robot.move(delta_orient, delta_forward)
			robot.draw()
			pygame.display.flip()



if __name__ == '__main__':
	pygame.init()
	pygame.display.set_caption("Move")
	screen = pygame.display.set_mode((display_width,display_height))
	robot = robot()
	Simulator().main(screen , robot)