Monkey-X - Beginners - Vectors Helper - code example

Import mojo

' This is the vector class. It has a 
' x and y float variable.
'
Class vectorf
    Field x:Float,y:Float
    Method New(x:Float,y:Float)
        Self.x = x
        Self.y = y
    End Method
End Class

Class MyGame Extends App
    ' Here we create a 'a' variable using the
    ' vectorf class
    Field a:vectorf
    ' cx and cy contain the center x and center y
    ' coordinates of the screen.
    Field cx:Int
    Field cy:Int
    ' time is a variable used to change(refresh)
    ' the information on the screen.
    Field time:Int
    Method OnCreate()
        SetUpdateRate(1)
        Seed = GetDate[4] + GetDate[5]
        cx = DeviceWidth()/2
        cy = DeviceHeight()/2
        ' Here we create a new vector in
        ' a with a new value(x and y)
        a = New vectorf(Rnd(-10,10),Rnd(-10,10))
    End Method
    Method OnUpdate()        
        time+=1
        If time>3 Then
            time=0
            a = New vectorf(Rnd(-10,10),Rnd(-10,10))
        End If
    End Method
    Method OnRender()
        ' pointx and y hold the coordinates
        ' that are used to draw on the screen.
        Local pointx:Int
        Local pointy:Int
        Cls 0,0,0 
        SetColor 255,255,255
        ' Here we draw the helper screen part.
        DrawLine cx,0,cx,DeviceHeight
        DrawLine 0,cy,DeviceWidth,cy
         DrawText "-X",0,cy
         DrawText "+X",DeviceWidth()-30,cy
         DrawText "-Y",cx,0
         DrawText "+Y",cx,DeviceHeight()-30
         DrawText "0,0",cx,cy,.5,.5
         DrawText "Origin",cx+5,cy-20
        ' Here we draw the vector.
        pointx = (a.x*10) + cx
        pointy = (a.y*10) + cy
        DrawCircle pointx,pointy,10
        DrawLine cx,cy,pointx,pointy
        DrawText "a",pointx,pointy,.5,.5
        DrawText String(a.x)[0..4]+","+String(a.y)[0..4],pointx,pointy+10
        '
        Scale 1.2,1.2
        SetAlpha .5
        DrawText "A vector describes a straight movement in 2D space",0,0
        DrawText "The two dimensions are called X and Y.",0,20
        DrawText "The origin(starting point of vector) is always 0,0",0,40
        DrawText "The words point or vector are the same.",0,60
    End Method
End Class


Function Main()
    New MyGame()
End Function