; (c)oded by Mr Brine
;
Graphics 640, 480
SetBuffer(BackBuffer())
Global o.gradobj = New gradobj
Repeat
Cls
Text 0, 0, "* = your ship"
Text 0, 12, "# = homing missile"
Text 0, 24, "click the lmb to make homing missile home in on your ship"
Text 0, 36, "press esc to quit"
If(MouseHit(1)) CalcGrad(o, MouseX(), MouseY())
Text MouseX(), MouseY(), "*"
Text o\x, o\y, "#"
AddGrad(o, 2)
Flip
VWait
Until KeyHit(1)
; ----------------------------------------------------------------------------------------------------
Type GradObj
Field x#, y#
Field xg#, yg#
Field xd#, yd#
Field ld#
End Type
Function CalcGrad(o.GradObj, newx#, newy#)
o\xd = newx - o\x
o\yd = newy - o\y
o\ld = Sqr(o\xd * o\xd + o\yd * o\yd)
o\xg = o\xd / o\ld
o\yg = o\yd / o\ld
End Function
Function AddGrad(o.GradObj, speed#)
o\x = o\x + o\xg * speed
o\y = o\y + o\yg * speed
End Function |
