struct Parabola
real a
real b
real v
real ang
real s
real x
real y
real z
real z0
real period
static method CreateUsingDistance takes real x, real y, real z, real h, real dst, real ang, real v returns Parabola
local Parabola this = Parabola.create()
set .x = x
set .y = y
set .z0 = z
set .ang = ang*bj_DEGTORAD
set .v = v
set .period = .025
set .a = (-h*4.)/(dst*dst)
set .b = (4.*h)/dst
return this
endmethod

method Update takes nothing returns nothing
local real v = .v*.period
set .s = .s+v
set .z = .s*(.a*.s+.b)+.z0
set .x = .x+v*Cos(.ang)
set .y = .y+v*Sin(.ang)
endmethod

method Destroy takes nothing returns nothing
set .a = 0.
set .b = 0.
set .v = 0.
set .ang = 0.
set .s = 0.
set .x = 0.
set .y = 0.
set .z = 0.
set .z0 = 0.
set .period = 0.
call .destroy()
endmethod

endstruct