How to make circles: Difference between revisions

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__TOC__
#REDIRECT [[Circle]]
 
== Introduction ==
 
This tutorial will show you how to make semicircles and circles.  It would be helpful if you knew some basic trigonometry, but it is not necessary.
 
== What are we trying to do? ==
 
This is not a [[Part]] with the shape of a [[Ball]].  This is instead a rather hollow outline pixelated with many small bricks.  In fact, you won't be touching bricks at all -- you will only be scripting.
 
== Steps ==
 
* Create a new, blank, map in [[Roblox Studio]].
* Insert > Object > Script
* Insert the following into that script (the explanation is below):
 
<pre>
local i = 0
for i = 1, 360, 1 do
 
local p = Instance.new("Part")
p.Parent = game.Workspace
p.Name = "Brick"
p.Size = Vector3.new(1,1,1)
p.Anchored = true
p.Position=Vector3.new(100*math.cos(i), 100*math.sin(i))
wait()
end
</pre>
 
== Explanation ==
 
A circle has 360 degrees.  You are going to create 360 little bricks for your circle.  The "for" loop runs 360 times.<br>
Each time the "for" loop runs, it:<br>
* Creates a new 'part', of which the parent is "game.Workspace".
* The part's name is "Brick"
* The Brick's size is (1,1,1) -- remember, we wanted little bricks.
* All the bricks are anchored, so that they don't fall down.<br>
 
Now comes the tricky part: we want to position the bricks as a circle.  If you've taken trigonometry, the next line should make sense.  If not, all this is saying that the X value should be 100 times a mathematical function named "cosine" of the value of "i", and the Y value should be 100 times a mathematical function named "sine" of the value of "i".  Sine and cosine are functions to study angles and circles.
 
Run this, and you should get a nice little semicircle.  You can copy and flip it, and you'll get a full circle.
 
[[Category:Scripting Tutorials]]

Latest revision as of 21:34, 23 January 2011

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