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AppGameKit Classic Chat / Maths/Physics question

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Grook
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12
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Joined: 22nd Jun 2012
Location: Lancashire, England
Posted: 17th Jul 2015 19:54
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What I'm trying to achieve should be easy, but I can't figure it out - been a long time since I did my pure maths A-level...

So I have a missile like physics object that homes in on the player and it works marvellously apart from one thing - it slows down as it nears the player. I know why this is - the velocity vectors get smaller as the objects get closer but I can't work out how to get a constant velocity towards the player regardless of the distance. I'm doing something like this...


... where ftx & fty are my player position and fmx and fmy are my missle position.

Help a tired-brained eejit out eh?

"It is said that your life flashes before your eyes just before you die. That is true, it's called Life.”
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Markus
Valued Member
20
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Joined: 10th Apr 2004
Location: Germany
Posted: 17th Jul 2015 23:11
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player pos
px
py
missile pos
mx
my
delta
dx=px-mx
dy=py-my
length
l=sqrt(dx*dx+dy*dy)
size 1
dx=dx/l
dy=dy/l
Velocity = direction * value
vx=dx*100.0
vy=dy*100.0

AGK 108 (B)19 + AppGameKit (Steam) V2 Beta .. : Windows 8.1 Pro 64 Bit : AMD Radeon R7 265 : Mac mini OS X 10.10 (Yosemite)
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Grook
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Joined: 22nd Jun 2012
Location: Lancashire, England
Posted: 18th Jul 2015 12:56
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Thanks Markus, appreciate the answer. Works like a charm!

"It is said that your life flashes before your eyes just before you die. That is true, it's called Life.”
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