Saturday, March 4, 2017

Monkey-X - Collision - Point vs Point - code example

'  From the book '2d game collision detection'

Import mojo

' This is the collision class. In this example with
' the point vs point method.
Class collision
    Method points_collide:Bool(a:vector2d,b:vector2d)
        Return a.x = b.x And a.y = b.y
    End Method
End Class

Class vector2d
    ' x and y hold the position of the vector
    Field x:Int,y:Int
    Method New(x:Int,y:Int)
        Self.x = x
        Self.y = y
    End Method
End Class

' col is the caller of the class collision. 
' we use it to use the collision methods.
Global col:collision = New collision

Class MyGame Extends App

    Method OnCreate()
    End Method
    Method OnUpdate()        
    End Method
    Method OnRender()
        Cls 0,0,0 
        SetColor 255,255,255
        ' a,b and c are variables that are turned into vectors
        ' using the vector2d class
        Local a:vector2d = New vector2d(100,100)
        Local b:vector2d = New vector2d(100,100)
        Local c:vector2d = New vector2d(101,100)
        DrawText "point a : "+a.x+","+a.y,0,100
        DrawText "point b : "+b.x+","+b.y,0,120
        DrawText "point c : "+c.x+","+c.y,0,140
        If col.points_collide(a,b)
            DrawText "Points a vs b - Collision",0,0
            DrawText "Points a vs b - No Collision",0,0
        End If
        If col.points_collide(a,c)
            DrawText "Points a vs c - Collision",0,20        
            DrawText "Points a vs c - No Collision",0,20
        End If        
    End Method
End Class

Function Main()
    New MyGame()
End Function

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