blitzmax/mod/brl.mod/blitz.mod/doc/extends.bmx

Rem
Extends is used in a BlitzMax Type declaration to derive the Type from a specified base class.
End Rem

Type TShape
	Field	xpos,ypos
	Method Draw() Abstract
End Type

Type TCircle extends TShape
	Field	radius
	
	Function Create:TCircle(x,y,r)
		local c:TCircle=new TCircle
		c.xpos=x;c.ypos=y;c.radius=r
		return c
	End Function
	
	Method Draw()
		DrawOval xpos,ypos,radius,radius
	End Method
End Type

Type TRect extends TShape
	Field	width,height
	
	Function Create:TRect(x,y,w,h)
		local r:TRect=new TRect
		r.xpos=x;r.ypos=y;r.width=w;r.height=h
		return r
	End Function
	
	Method Draw()
		DrawRect xpos,ypos,width,height
	End Method
End Type

local 	shapelist:TShape[4]
local	shape:TShape

shapelist[0]=TCircle.Create(200,50,50)
shapelist[1]=TRect.Create(300,50,40,40)
shapelist[2]=TCircle.Create(400,50,50)
shapelist[3]=TRect.Create(200,180,250,20)

graphics 640,480
while not keyhit(KEY_ESCAPE)
	cls
	for shape=eachin shapelist
		shape.draw
	next
	flip
wend
end