; CreateSweep Example
; -------------------

Graphics3D 640,480,0,2
SetBuffer BackBuffer()

camera=CreateCamera()
PositionEntity camera,0,2.5,-8
RotateEntity camera,15,0,0

light=CreateLight()
RotateEntity light,45,45,0

ground=CreatePlane()
EntityColor ground,70,110,70

; A crash barrier's cross-section: an I-beam 30 cm wide and 60 cm tall
beam=CreateProfile()
For index=0 To 11
    Read x#,y#
    AddProfilePoint beam,x,y
Next
Data -0.15,0
Data 0.15,0
Data 0.15,0.08
Data 0.04,0.08
Data 0.04,0.52
Data 0.15,0.52
Data 0.15,0.6
Data -0.15,0.6
Data -0.15,0.52
Data -0.04,0.52
Data -0.04,0.08
Data -0.15,0.08

closed=True
caps=True
barrier=0

While Not KeyDown(1)

    ; C opens or closes the loop, P switches the end caps of an open barrier
    If KeyHit(46) Then
        closed=Not closed
        If barrier Then FreeEntity barrier
        barrier=0
    EndIf
    If KeyHit(25) Then
        caps=Not caps
        If barrier Then FreeEntity barrier
        barrier=0
    EndIf

    If barrier=0 Then
        ; A rectangle of corner points, so each corner is mitred sharply
        route=CreateSpline(closed)
        AddSplinePoint route,-4,0,-2.5,0,1,True
        AddSplinePoint route,4,0,-2.5,0,1,True
        AddSplinePoint route,4,0,2.5,0,1,True
        AddSplinePoint route,-4,0,2.5,0,1,True
        ; The profile's x and y become the path's right and up
        barrier=CreateSweep(beam,route,caps)
        FreeSpline route
        EntityColor barrier,200,200,210
    EndIf

    TurnEntity barrier,0,0.2,0

    ; Arrow keys move the camera
    If KeyDown(200) Then MoveEntity camera,0,0,0.1
    If KeyDown(208) Then MoveEntity camera,0,0,-0.1
    If KeyDown(203) Then TurnEntity camera,0,1,0
    If KeyDown(205) Then TurnEntity camera,0,-1,0

    RenderWorld

    Text 0,0,"Arrow keys: move camera   C: closed loop   P: end caps   Esc: exit"
    Text 0,20,"CreateSweep(beam,route,"+caps+")   closed spline: "+closed
    If closed Then
        Text 0,40,"A closed loop has no ends, so caps make no difference"
    Else
        Text 0,40,"An open barrier: look at its ends with and without caps"
    EndIf

    Flip

Wend

End