SuperStrict
Type TSnake
Field x :Double
Field y :Double
Field dx :Double
Field dy :Double
Field speed :Double
Field spacing :Double
Field angle :Double
Field r :Int
Field g :Int
Field b :Int
Field head :TSnake
Field tail :TSnake
Field last :tsnake
'=============================================================================
'
' a recursive function that links all of the parts together
' the first time it is called must be called with the "first"
' flag set to true.
'
'==============================================================================
Function Create(segment:Tsnake,x:Float,y:Float,parts:Int,first:Int = True)
If parts = 0
segment = Null ' first segemnt must bee created outside with "new TSnake"
' before calling create function the first time.
Return
EndIf
If first = True
segment = segment
segment.x = x
segment.y = y
segment.dx = 1.0
segment.dy = 0.0
segment.speed = 15.0
segment.spacing = 5.0
segment.r = Rand(255)
segment.g = Rand(255)
segment.b = Rand(255)
EndIf
Local s:Tsnake = New Tsnake 'create the next segment
'assign values
s.x = x
s.y = y
s.dx = segment.dx
s.dy = segment.dy
s.spacing = segment.spacing
s.speed = segment.speed
s.r = Rand(255)
s.g = Rand(255)
s.b = Rand(255)
segment.tail = s ' connect the new segment to the tail of previous segment.
s.head = segment ' connect the previous segment to the head of new segment.
Create(s, s.x, s.y,parts-1, False) ' call it self(recurse) until all segments created.
' False signifies it is not the first time called.
End Function
Method move(prev:TSnake) 'calculate new semgnet position.
Local sx:Double = prev.x - x
Local sy:Double = prev.y - y
angle:Double = ATan2(sy,sx)
Local dist:Double = Sqr(sx*sx+sy*sy)
If dist > spacing Then
x :+Cos(angle)*speed
y :+Sin(angle)*speed
speed = prev.speed
Else
speed = prev.speed
EndIf
End Method
Method update()
Local n:tsnake = Self
If last = Null ' if tail (or last object not found)
Repeat ' find it
n = n.tail ' get next segment(object)
last = n ' save it
Until n.tail = Null' if found the last segment exit.
EndIf
n = last ' set n to last segment
Repeat 'traverst through linklist n from last to first
If n = Self 'if found the first object(head)
'calculate movement of the head
n.dx = Cos(n.angle)
n.dy = Sin(n.angle)
'check for collition ugainst the walls
If (n.x +n.dx*n.speed) < GraphicsWidth() And (n.x +n.dx*n.speed) > 0
n.x = n.x + n.dx * n.speed
EndIf
If (n.y +n.dy*n.speed) < GraphicsHeight() And (n.y+n.dy*n.speed) > 0
n.y = n.y + n.dy * n.speed
EndIf
Else
n.move(n.head) 'move previous segment
EndIf
n = n.head 'jump to the previous object(segment)
Until n = Null ' exit if found head(first object). n has a null head pointer
End Method
Method draw()
Local n:TSnake = last
Repeat
SetColor n.r,n.g,n.b
DrawOval n.x-10,n.y-10,20,20
n = n.head
Until n.head = Null
End Method
Method control()
Local dir:Int = KeyDown(key_Right)-KeyDown(key_left)
Local spd:Int = KeyHit(key_up)-KeyHit(key_down)
angle = (angle+dir*10)Mod 360
speed :+ spd
If speed > 5 Then speed = 5
If speed < 0 Then speed = 0
End Method
End Type
SetGraphicsDriver GLMax2DDriver()
Graphics 800,600
Local snake:tsnake = New tsnake
SetBlend alphablend
TSnake.Create(snake,300,300,1000)
snake.speed = 2
Repeat
Cls
snake.control()
snake.update()
snake.draw()
Flip()
Until KeyDown(key_escape) |
