1
00:00:00,000 --> 00:00:07,000
Hello, in this video tutorial I'm going to show you a different way in which you can move your character

2
00:00:08,000 --> 00:00:16,000
Till now we have moved our character by hitting the right arrow and left arrow keys

3
00:00:16,000 --> 00:00:23,000
and using when, right arrow key pressed, point right and move

4
00:00:23,000 --> 00:00:33,000
and when, left arrow key pressed, point left and move

5
00:00:33,000 --> 00:00:38,000
and now we are going to use a different block

6
00:00:38,000 --> 00:00:46,000
instead of using move we are going to use change the x coordinate

7
00:00:46,000 --> 00:00:48,000
right?

8
00:00:48,000 --> 00:00:56,000
and instead of using when, right arrow key pressed, we are going to use if

9
00:00:56,000 --> 00:01:04,000
and under sensing, key pressed

10
00:01:04,000 --> 00:01:11,000
if right arrow key pressed, then change x by 10

11
00:01:11,000 --> 00:01:15,000
this has to be inside a forever

12
00:01:15,000 --> 00:01:24,000
and this two blocks, the forever and the if, will do the same as the when, right arrow key pressed

13
00:01:24,000 --> 00:01:27,000
why are we using this two instead of this one?

14
00:01:27,000 --> 00:01:31,000
because we want something to be included here inside the forever

15
00:01:31,000 --> 00:01:39,000
whenever this key or the left arrow key are not pressed

16
00:01:39,000 --> 00:01:44,000
so I'm going to duplicate this for the left one

17
00:01:44,000 --> 00:01:52,000
so if left arrow key pressed, change by a negative amount now

18
00:01:52,000 --> 00:01:59,000
and this is going to be under a green flag, so it happens from the beginning

19
00:01:59,000 --> 00:02:05,000
now what's happening here, we are not going to use those two now

20
00:02:06,000 --> 00:02:11,000
you may imagine something is wrong after

21
00:02:11,000 --> 00:02:15,000
this to the right and this to the left

22
00:02:15,000 --> 00:02:25,000
now, we want it to point into the direction

23
00:02:25,000 --> 00:02:31,000
point to the right and now point to the left

24
00:02:31,000 --> 00:02:34,000
and now something else is going to happen

25
00:02:34,000 --> 00:02:39,000
you may be imagining it by now

26
00:02:39,000 --> 00:02:41,000
ok, so let's check it

27
00:02:41,000 --> 00:02:44,000
going right and now going left is upside down

28
00:02:44,000 --> 00:02:50,000
always because we haven't placed set rotation style left right

29
00:02:50,000 --> 00:02:55,000
so at the beginning we set rotation style left right

30
00:02:55,000 --> 00:03:00,000
and now it's moving right and moving left

31
00:03:00,000 --> 00:03:07,000
let's say I also place the cat at a starting position

32
00:03:07,000 --> 00:03:11,000
so I will drag and drop it and use the go to block

33
00:03:13,000 --> 00:03:19,000
and now I have a motion to the right and motion to the left

34
00:03:19,000 --> 00:03:26,000
if I want to include the animation I can do it at a separate thread like this

35
00:03:27,000 --> 00:03:41,000
so from the beginning I use a forever and a next custom

36
00:03:41,000 --> 00:03:49,000
and now I can use a wait here so I can control the rhythm of the animation

37
00:03:49,000 --> 00:03:55,000
independent from the speed of the motion, let's say 0.2

38
00:03:55,000 --> 00:03:59,000
and now this is what happens, it's animated

39
00:03:59,000 --> 00:04:04,000
but then it's animated even though it's not moving

40
00:04:04,000 --> 00:04:14,000
so I want this animation to happen only if I'm pressing either one of these two keys or any key

41
00:04:14,000 --> 00:04:16,000
so I'm going to use an if

42
00:04:17,000 --> 00:04:28,000
and again under sensing key press and I will pick here any key

43
00:04:28,000 --> 00:04:37,000
so this will happen only when I'm hitting the keys

44
00:04:37,000 --> 00:04:45,000
so now it's not animated, I hold down the right arrow key it's animated

45
00:04:45,000 --> 00:04:47,000
I hold down the left arrow key it's animated

46
00:04:47,000 --> 00:04:58,000
so till now nothing new from what we accomplished using when, right arrow, key press, point right and move

47
00:04:58,000 --> 00:05:05,000
but I want this to be more realistic so I'm going to include some acceleration

48
00:05:05,000 --> 00:05:14,000
so for this to accelerate this number should change

49
00:05:14,000 --> 00:05:20,000
so for the number to change I'm going to use a variable

50
00:05:20,000 --> 00:05:28,000
I go into variables and make a variable, I'm going to call it xSpeed

51
00:05:28,000 --> 00:05:38,000
and I want it to be 0 at the beginning

52
00:05:39,000 --> 00:05:48,000
and so now instead of changing the position I'm going to change the speed

53
00:05:48,000 --> 00:05:57,000
so I will change the horizontal speed when I hit the right arrow key

54
00:05:57,000 --> 00:06:05,000
I'm going to change it by let's say 2, you can make it go faster or slower by changing this number

55
00:06:05,000 --> 00:06:15,000
and if going left I want to change the horizontal speed by a negative number

56
00:06:15,000 --> 00:06:25,000
but now I'm not changing the position so it's not actually moving it's just pointing left and right

57
00:06:25,000 --> 00:06:35,000
for the change to happen this has to be under the green flag

58
00:06:35,000 --> 00:06:45,000
so it happens from the beginning and we want the change to happen forever

59
00:06:46,000 --> 00:06:56,000
but we don't want the change to be just 10, we want it to be a different value

60
00:06:56,000 --> 00:07:03,000
depending on if we hit the left or right arrow keys

61
00:07:03,000 --> 00:07:09,000
so the change in position will be the value of the variable

62
00:07:09,000 --> 00:07:16,000
and we change the value of the variable here by hitting the right or the left arrow keys

63
00:07:16,000 --> 00:07:22,000
so at the beginning the xSpeed will be 0

64
00:07:22,000 --> 00:07:30,000
if I hit the right arrow once it will become 2

65
00:07:30,000 --> 00:07:36,000
if I hit the left one it will become, actually I hit it twice

66
00:07:36,000 --> 00:07:41,000
if I keep it hit it, it goes faster and faster, you see

67
00:07:41,000 --> 00:07:46,000
because it becomes 2, then 4, then 6, then 8, 10 and so on

68
00:07:46,000 --> 00:07:57,000
and if I hold down the left arrow key it becomes

69
00:07:57,000 --> 00:08:02,000
greater than in the negative side so it accelerates to the left

70
00:08:02,000 --> 00:08:07,000
so now the longer I keep it the faster it goes

71
00:08:07,000 --> 00:08:14,000
but then this is not realistic because it doesn't stop

72
00:08:14,000 --> 00:08:23,000
so as I said before I want something to happen when I'm not hitting the keys

73
00:08:23,000 --> 00:08:32,000
when I release my finger from the keys I want it to decelerate and stop automatically

74
00:08:32,000 --> 00:08:42,000
so how I make the xSpeed a lesser and lesser value automatically

75
00:08:42,000 --> 00:08:49,000
I'm going to multiply it by a number lesser than 1

76
00:08:49,000 --> 00:08:53,000
so I go to operators and multiply

77
00:08:53,000 --> 00:09:05,000
so if I make the xSpeed xSpeed times 0.9 it becomes a small number

78
00:09:05,000 --> 00:09:14,000
so I'm going to set the value of the xSpeed to a new one

79
00:09:14,000 --> 00:09:20,000
which is the previous one that made it smaller

80
00:09:20,000 --> 00:09:28,000
and if I put it into the forever loop it will go smaller and smaller

81
00:09:28,000 --> 00:09:37,000
so, see, we start here, it's 0, I hold down the right arrow key

82
00:09:37,000 --> 00:09:41,000
the xSpeed will go up and as soon as I release it

83
00:09:41,000 --> 00:09:47,000
it will start automatically to get smaller until it gets to 0

84
00:09:47,000 --> 00:09:50,000
there it goes

85
00:09:50,000 --> 00:09:54,000
and the same thing happens when going to the left

86
00:09:54,000 --> 00:09:57,000
accelerates and then decelerates

87
00:09:57,000 --> 00:10:05,000
so now it automatically decelerates and it takes a little time for it to happen

88
00:10:05,000 --> 00:10:07,000
so it becomes so realistic

89
00:10:07,000 --> 00:10:13,000
it accelerates and when I release the key it decelerates and stops

90
00:10:13,000 --> 00:10:22,000
why? because imagine I hold the right key until this changes from 0 to 2

91
00:10:22,000 --> 00:10:26,000
then to 4, 6, 8 and 10

92
00:10:26,000 --> 00:10:30,000
and then I release the key

93
00:10:30,000 --> 00:10:37,000
so the xSpeed is 10 and now it multiplies by 0.9 so it becomes 9

94
00:10:37,000 --> 00:10:46,000
so in the next loop the 9 becomes 9 times 0.9

95
00:10:46,000 --> 00:10:50,000
so 8.1

96
00:10:50,000 --> 00:10:58,000
and then at the next cycle 8.1 times 0.9 becomes 7 point something

97
00:10:58,000 --> 00:11:02,000
and then 7 point something times 0.9 becomes 6 point something

98
00:11:02,000 --> 00:11:07,000
and so it decreases automatically until it stops

99
00:11:07,000 --> 00:11:12,000
so, let's see what's in here

100
00:11:12,000 --> 00:11:16,000
first of all, the motion is all in here

101
00:11:16,000 --> 00:11:21,000
the position changes by the value of the xSpeed variable

102
00:11:21,000 --> 00:11:24,000
at the beginning it's 0

103
00:11:25,000 --> 00:11:30,000
any time we hit a right arrow this value increases

104
00:11:30,000 --> 00:11:35,000
so if we keep it hit the xSpeed will become greater

105
00:11:35,000 --> 00:11:38,000
and the change in x will become greater

106
00:11:38,000 --> 00:11:40,000
so it accelerates to the right

107
00:11:40,000 --> 00:11:46,000
same thing happens but in reverse when we hit the left key

108
00:11:46,000 --> 00:11:51,000
if we hold it the xSpeed will decrease

109
00:11:51,000 --> 00:11:55,000
and it will become greater than negative

110
00:11:55,000 --> 00:11:59,000
so it will move faster to the left, accelerating to the left

111
00:11:59,000 --> 00:12:03,000
and if we are not hitting any key

112
00:12:03,000 --> 00:12:11,000
then the horizontal speed, the value by which the coordinate changes

113
00:12:11,000 --> 00:12:16,000
will decrease automatically until it becomes 0

114
00:12:16,000 --> 00:12:20,000
so it will automatically decelerate

115
00:12:20,000 --> 00:12:25,000
and that's the new way in which you can move your character

116
00:12:25,000 --> 00:12:30,000
while the animation is taken care of in this group here

117
00:12:30,000 --> 00:12:41,000
and this if any key pressed will make the animation go whenever you hit any key

118
00:12:41,000 --> 00:12:44,000
and stop if you are not hitting it

119
00:12:44,000 --> 00:12:49,000
and that's what I wanted you to learn in this tutorial

120
00:12:49,000 --> 00:12:50,000
thank you