Monkey-X - Beginners - Diagional bouncing and control - code example

Here a short example that shows how to bounce a object diagionally against the sides of the screen. The cursor keys can be used to change the direction.

Import mojo

' player coords and start position
Global px:Int = 320
Global py:Int = 220
' starting movement direction
Global horizdir:String="right"
Global vertdir:String="up"
Global movementspeed = 3

Class MyGame Extends App
    Method OnCreate()
        SetUpdateRate(60)
    End
    Method OnUpdate()
        ' the next 4 lines is the input (cursors)
        If KeyDown(KEY_LEFT) Then horizdir="left"        
        If KeyDown(KEY_RIGHT) Then horizdir="right"
        If KeyDown(KEY_UP) Then vertdir="up"
        If KeyDown(KEY_DOWN) Then vertdir="down"
        For Local i=0 Until movementspeed
            ' move the player based on the direction
            Select horizdir
                Case "left"
                    px-=1
                Case "right"
                    px+=1
            End Select
            Select vertdir
                Case "up"
                    py-=1
                Case "down"
                    py+=1
            End Select
            ' if the player is outside of the device
            ' screen then (BOUNCE) go in oposite direction
            If px<0 Then horizdir="right"
            If px>640-16 Then horizdir="left"
            If py<0 Then vertdir="down"
            If py>480-16 Then vertdir="up"
        Next
    End
    Method OnRender()
        Cls 0,0,0 
        'set the color
        SetColor 255,255,255
        ' draw the player
        DrawRect px,py,16,16
        DrawText "Diagional Bounce Example - Use cursors to change direction.",10,10
    End
End

Function Main()
    New MyGame()
End