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Mind
Joined: Thu Mar 06, 2008 10:54 pm
Posts: 1360
Location: USA
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 Circular Motion It's a pretty basic topic if you know what you're doing. Unfortunately, I do not. This is what I've come to so far: Code: function Create(self)
circlex = self.Pos.X;
circley = self.Pos.Y;
radius = 10;
speed = (2 * math.pi * radius)/2
speedScale = speedScale + .5;
end
function Update(self)
angle = speedScale;
self.Pos.X = circlex + math.sin(angle)*radius;
self.Pos.Y = circley + math.cos(angle)*radius;
end I'm pretty positive it has to do with speed/speedscale, but I'm unable to find what it is. Any help would be greatly appreciated. Edit: It's the fact that I don't get how to constantly make the point actually MOVE around the circle, rather than it being a static point on the circle.
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| Thu Feb 24, 2011 1:20 am |
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TheLastBanana
DRL Developer
Joined: Wed Dec 13, 2006 5:27 am
Posts: 3138
Location: A little south and a lot west of Moscow
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Re: Circular Motion The problem is that the variable "angle" never changes. You're just setting it to the same value every frame, instead of incrementing it.
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| Thu Feb 24, 2011 1:57 am |
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Mind
Joined: Thu Mar 06, 2008 10:54 pm
Posts: 1360
Location: USA
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Re: Circular Motion But that's what I don't get. I have angle(SpeedScale) increasing in increments of 0.5... Idk why I have two variables when I could have just one, but it should steadily increase by .5 every single frame, no? I'm sure it's something dumb that I'm not noticing, but like I said I can't get it. And should it decrease back to 0 once it does reach 180, right? (By adding code, of course) Code: function Create(self)
circlex = self.Pos.X;
circley = self.Pos.Y;
radius = 10;
speed = (2 * math.pi * radius)/2
speedScale = speedScale + .5;
end
function Update(self)
angle = speedScale;
self.Pos.X = circlex + math.sin(angle)*radius;
self.Pos.Y = circley + math.cos(angle)*radius;
end
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| Thu Feb 24, 2011 2:04 am |
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Roast Veg
Data Realms Elite
Joined: Tue May 25, 2010 8:27 pm
Posts: 4522
Location: Constant motion
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Re: Circular Motion It will only update if it's in the update function. Declare speedscale in create, then increment it in update.
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| Thu Feb 24, 2011 2:08 am |
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Mind
Joined: Thu Mar 06, 2008 10:54 pm
Posts: 1360
Location: USA
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Re: Circular Motion I love you, TLB and Roast Veg both. I seriously appreciate the help, guys. Thanks a lot.
(it worked)
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| Thu Feb 24, 2011 2:14 am |
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Mind
Joined: Thu Mar 06, 2008 10:54 pm
Posts: 1360
Location: USA
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Re: Circular Motion Code: function Create(self)
circlex = self.Pos.X;
circley = self.Pos.Y;
radius = 100;
radiuscheck = true;
speedScale = 0;
end
function Update(self)
if radius == 100 then
radiuscheck = false;
end
if radius > 99 and radiuscheck == false then
radius = radius + 1;
elseif radius > 200 then
radius = radius - 1;
elseif radius < 50 then
radius = radius + 1
end
speedScale = speedScale + 0.1;
if speedScale > 180 then
speedScale = 0;
end
angle = speedScale;
self.Pos.X = circlex + math.cos(angle)*radius;
self.Pos.Y = circley + math.sin(angle)*radius;
end Alright I'm trying to make the radius increase to 200 then decrease back to 100 continuously, but I can't figure out how to through checks. It just keeps increasing, for I can see the radius = radius + 1 is overriding the "if radius > 200" statement. I just don't know how to fix it. Thanks again!
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| Thu Feb 24, 2011 2:39 am |
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Roast Veg
Data Realms Elite
Joined: Tue May 25, 2010 8:27 pm
Posts: 4522
Location: Constant motion
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Re: Circular Motion Code: function Create(self)
circlex = self.Pos.X;
circley = self.Pos.Y;
radius = 100;
radiuscheck = true;
speedScale = 0;
reverse = false;
end
function Update(self)
if radius == 50 then
reverse = false;
elseif radius == 200 then
reverse = true;
end
if reverse == false then
radius = radius + 1;
else
radius = radius -1;
end
speedScale = speedScale + 0.1;
if speedScale > 180 then
speedScale = 0;
end
angle = speedScale;
self.Pos.X = circlex + math.cos(angle)*radius;
self.Pos.Y = circley + math.sin(angle)*radius;
end
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| Thu Feb 24, 2011 2:50 am |
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Mind
Joined: Thu Mar 06, 2008 10:54 pm
Posts: 1360
Location: USA
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Re: Circular Motion That makes so much more sense. Changing the values at specific values rather than a range of them.
Thanks <3
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| Thu Feb 24, 2011 3:02 am |
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Roast Veg
Data Realms Elite
Joined: Tue May 25, 2010 8:27 pm
Posts: 4522
Location: Constant motion
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Re: Circular Motion Don't mention it. I'm having rather the Lua filled evening anyway.
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| Thu Feb 24, 2011 3:03 am |
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Nocifer
Joined: Tue Mar 16, 2010 7:38 pm
Posts: 447
Location: The Ninth Circle
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Re: Circular Motion Just to add to your Lua-filled evening, how well does Lua handle parametric equations? I'm wondering if that might help with defining this sort of thing.
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| Thu Mar 03, 2011 1:25 am |
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TheLastBanana
DRL Developer
Joined: Wed Dec 13, 2006 5:27 am
Posts: 3138
Location: A little south and a lot west of Moscow
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Re: Circular Motion I'm not sure what you mean by that. You don't really use equations in programming.
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| Thu Mar 03, 2011 1:33 am |
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411570N3
Joined: Wed Jan 07, 2009 10:26 am
Posts: 4074
Location: That quaint little British colony down south
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Re: Circular Motion Lua would handle parametric equations just fine, but it's probably easier and more efficient to chuck it all on the one line.
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| Thu Mar 03, 2011 7:58 am |
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