$OBJECT=ShipClass
$OBJECT=BubbleClass
$OBJECT=AmmoClass

Option Explicit

'----------------------------------------------------------------------------
' Game3.txt
'----------------------------------------------------------------------------
' Use path to this file as parameter to Sprite.exe.  E.g.:
'    Sprite C:\Tmp\Game3.txt
' See "Game.Pix" for list of images available, numbered 0-n.
'----------------------------------------------------------------------------

Dim sShip               'Player's ship


'----------------------------------------------------------------------------
' GAME events
'
Sub Game_NewGame()
'   ------------
    'Sprites Bounce on inner border:
    ShipClass.Border   = 15
    BubbleClass.Border = 15
    AmmoClass.Border   = 15

    'Setup Collision possibilities.  Bit 1 is reserved for hitting same-kind objects.
    ShipClass.Collide   = 2
    BubbleClass.Collide = 2 + 4
    AmmoClass.Collide   =     4

    'Setup Standard images for the different classes of sprites
    ShipClass.Image   = 32		'Ship
    BubbleClass.Image = 60		'Small bubble
    AmmoClass.Image   = 35		'Ammo

    'Extra Ship Info
    Game.ScoreFirst1Up = 250
    Game.DScoreNext1Up = 500

    ShipClass.Friction = 0.981
    Set sShip = ShipClass.CreateSprite(Game.Width / 2, Game.Height / 2, 0)
    BubbleClass.CreateSprite 0, 0, 0
End Sub


Sub Game_KeyDown(ByVal ch)
'   ------------
    Dim sT

    'Too many shots on screen already?
    If AmmoClass.SpriteCount > 5 Then Exit Sub

    'Game Over?
    If Game.ShipCount <= 0 Then Exit Sub

    'Up
    If ch = 38 Then
        sShip.Image = 24
        Set sT = AmmoClass.CreateSprite(sShip.Left + sShip.Width / 2, sShip.Top, 0)
        sT.Vx = 0 : sT.Vy = -5
        sShip.Vy = sShip.Vy + 1
    End If

    'Down
    If ch = 40 Then
        sShip.Image = 8
        Set sT = AmmoClass.CreateSprite(sShip.Left + sShip.Width / 2, sShip.Top + sShip.Height, 0)
        sT.Vx = 0 : sT.Vy = 5
        sShip.Vy = sShip.Vy - 1
    End If

    'Left
    If ch = 37 Then
        sShip.Image = 16
        Set sT = AmmoClass.CreateSprite(sShip.Left, sShip.Top + sShip.Height / 2, 0)
        sT.Vx = -5 : sT.Vy = 0
        sShip.Vx = sShip.Vx + 1
    End If

    'Right
    If ch = 39 Then
        sShip.Image = 0
        Set sT = AmmoClass.CreateSprite(sShip.Left + sShip.Width, sShip.Top + sShip.Height / 2, 0)
        sT.Vx = 5 : sT.Vy = 0
        sShip.Vx = sShip.Vx - 1
    End If
End Sub


Sub DoShipHit()      'Decrease # ships, end game if none left
'   ---------
    sShip.Image = 32
    Game.ShipCount = Game.ShipCount - 1
    If Game.ShipCount <= 0 Then
        Game.EndGame
    Else
        sShip.Vx = 0
        sShip.Vy = 0
        sShip.MoveTo Game.Width / 2, Game.Height / 2
    End If
End Sub


Sub DoNewBubble(ByVal left, ByVal top, ByVal vx, ByVal vy)
'   -----------
    Dim sT

    Set sT = BubbleClass.CreateSprite(left, top, 1)
    sT.Vx  = vx * 0.5 + 4 * Rnd() - 2
    sT.Vy  = vy * 0.5 + 4 * Rnd() - 2
End Sub


Sub Game_Collide(ByVal sLowId, ByVal sHighId, ByVal coll)
'   ------------
    Dim ship
    Dim bubble
    Dim ammo
    Dim sT

    Select Case coll
        Case 2
            Set ship   = sLowId
            Set bubble = sHighId
            If ship.Image <> 32 Then
                'Ship Hit Bubble
                Call DoShipHit
            End If

	Case 4
            Set bubble = sLowId
            Set ammo   = sHighId
            ammo.Remove
            If bubble.Image <= 57 Then
                Game.AddScore 50
                bubble.Remove
                DoNewBubble bubble.Left, bubble.Top, bubble.Vx - ammo.Vx, bubble.Vy - ammo.Vy
                DoNewBubble bubble.Left, bubble.Top, bubble.Vx + ammo.Vx, bubble.Vy + ammo.Vy
            Else
                bubble.Image = bubble.Image - 1
                Game.AddScore 5
            End If
    End Select
End Sub


'----------------------------------------------------------------------------
' ShipClass events
'
Sub ShipClass_Init(ByVal s, ByVal u)
    s.TickEvent = 5
End Sub

Sub ShipClass_Border(ByVal s, ByVal brd)
    'Randomize velocity, then bounce ship
    s.Vx = s.Vx + 6 * Rnd() - 3
    s.Vy = s.Vy + 6 * Rnd() - 3
    Game.StdBorderBounce s, brd
End Sub


'----------------------------------------------------------------------------
' BubbleClass events
'
Sub BubbleClass_Init(ByVal s, ByVal u)
    If s.Left = 0 Then
        'New Bubble, so start it at an edge, and give it a random direction
        Game.StdInitEdge s, u
        s.Vx = 12 * Rnd() - 6
        s.Vy = 12 * Rnd() - 6
    End If
End Sub

Sub BubbleClass_Border(ByVal s, ByVal brd)
    Game.StdBorderBounce s, brd
End Sub

'If no more enemies, create some
Sub BubbleClass_LastTerm()
'   --------------------
    BubbleClass.CreateSprite 0, 0, 0
End Sub


'----------------------------------------------------------------------------
' AmmoClass events
'
Sub AmmoClass_Border(ByVal s, ByVal brd)
    s.Remove
End Sub

'--- EOF ---