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Homebrew PS2, PSP & PS3 Development Discussions
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thsock
Joined: 25 Sep 2005
Posts: 25
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 Posted: Sun Nov 20, 2005 11:24 am Post subject: Timer or Frame based. which is better? |
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Since I began my 2d shooter Insane, I have been using basic Timer based animations. example below
lumo tells me that frame based is betterand far easier.
Which should I use! and how do I use frame based?
I believe the animation plays at the same speed no matter what the frame rate while using timer based animations. Is that correct?
| Code: |
local timer = Timer.new()
stop = false
if pfenemhealth <= 0 and pfenemorient == -1 then
pfenemalive = false
elapsedTenthSeconds = math.floor(timer:start() / 100 + 0.5)
if elapsedTenthSeconds <= 1 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df1)
elseif elapsedTenthSeconds <= 2 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df2)
elseif elapsedTenthSeconds <= 3 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df3)
elseif elapsedTenthSeconds <= 4 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df4)
elseif elapsedTenthSeconds <= 5 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df5)
elseif elapsedTenthSeconds <= 6 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df6)
elseif elapsedTenthSeconds <= 7 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df7)
elseif elapsedTenthSeconds <= 8 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df8)
elseif elapsedTenthSeconds <= 9 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df9)
elseif elapsedTenthSeconds <= 10 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df10)
elseif elapsedTenthSeconds <= 11 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df12)
elseif elapsedTenthSeconds <= 12 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df13)
elseif elapsedTenthSeconds <= 13 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df14)
elseif elapsedTenthSeconds <= 14 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df15)
elseif elapsedTenthSeconds <= 15 and pfenemalive == false then
screen:blit(pfenemxpos, pfenemypos, pfflip.df16)
elseif elapsedTenthSeconds >= 30 and pfenemalive == false then
pfenemalive = true
pfenemhealth = 20
if charhealth < 100 then
charhealth = charhealth + 10
end
score = score + 10
pfenemxpos = math.random(480)
timer:reset(0)
timer:stop()
end
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Durante
Joined: 02 Oct 2005
Posts: 65
Location: Austria
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| Posted: Sun Nov 20, 2005 2:42 pm Post subject: |
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Your code sucks. (sorry, I'm intoxicated.)
Anyway, frame based is better IMHO on a fixed hardware target like psp. |
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KawaGeo
Joined: 27 Aug 2005
Posts: 191
Location: Calif Mountains
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| Posted: Sun Nov 20, 2005 3:04 pm Post subject: |
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IMHO, timer-based operation is more accurate than frame-rate-based since frame rate may varies during the gameplay.
The long series of elseif's could be greatly shortened by using an array. E.g.,
| Code: |
if not pfenemalive then
if elapsedTenthSeconds < 17 then
screen:blit(pfenemxpos, pfenemypos, pfflip.df[elapsedTenthSeconds])
elseif elapsedTenthSeconds >= 30 then
pfenemalive = true
pfenemhealth = 20
if charhealth < 100 then
charhealth = charhealth + 10
end
score = score + 10
pfenemxpos = math.random(480)
timer:stop()
timer:reset()
end
end
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Also, timer.reset() should come after timer.stop() for the sake of logic but not necessarily.
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Geo Massar
Retired Engineer |
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cheriff
Regular
Joined: 23 Jun 2004
Posts: 262
Location: Sydney.au
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| Posted: Sun Nov 20, 2005 7:00 pm Post subject: |
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| KawaGeo wrote: | | IMHO, timer-based operation is more accurate than frame-rate-based since frame rate may varies during the gameplay. |
Yes, but if you wait for the vblank before switching frames, you know for certain that 1/60seconds have passed since the last frame. You also save on not having to check the time and things like that. Of course this only applies if your app runs quick enough to get everything done at 60Hz. But I believe frame based is better in this context, but on PC where targets differ greatly in performance then you would most likely go with timers. (to keep in mind if you want to port it, or co-develop on pc)
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Damn, I need a decent signature! |
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xigency
Joined: 11 Nov 2005
Posts: 1
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| Posted: Mon Nov 28, 2005 2:15 am Post subject: |
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what i do is use frame based animations and use a timer and delay to keep it running at a good FPS. since theres somuch going on in my games, 60 fps is too fast so i go with around 20-30 fps.
but timer based animations looks like a good idea too. if some of my animations are designed for different target framerates, then i might try that. |
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