StackOverflow2013

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plurals

PO
primarykey
Id
2510048
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
9
CommunityOwnedDate
CreationDate
2010-03-24T17:39:42.537
FavoriteCount
0
LastActivityDate
2010-10-28T19:21:25.850
LastEditDate
2017-05-23T12:34:34.613
LastEditorUserId
-1
OwnerUserId
230513
ParentId
2508704
PostTypeId
2
Score
61
ViewCount
0
LastEditorDisplayName
text
Body
Points on a <a href="http://en.wikipedia.org/wiki/Circle" rel="nofollow noreferrer">circle</a> may be specified as a function of the angle θ: <blockquote> x = a + r cos(θ) y = b + r sin(θ) </blockquote> Here, increments of 2π/8 are shown. Addendum: As suggested in a comment by @Christoffer Hammarström, this <a href="https://stackoverflow.com/posts/2510048/revisions">revised</a> example reduces the number of <a href="http://en.wikipedia.org/wiki/Magic_number_%28programming%29" rel="nofollow noreferrer">magic numbers</a> in the original. The desired number of points becomes a parameter to the constructor. It also adapts the rendering to the container's size. <img src="https://i.stack.imgur.com/aAyrg.png" alt="alt text"> <pre><code>/** @see https://stackoverflow.com/questions/2508704 */ public class CircleTest extends JPanel { private static final int SIZE = 256; private int a = SIZE / 2; private int b = a; private int r = 4 * SIZE / 5; private int n; /** @param n the desired number of circles. */ public CircleTest(int n) { super(true); this.setPreferredSize(new Dimension(SIZE, SIZE)); this.n = n; } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; g2d.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2d.setColor(Color.black); a = getWidth() / 2; b = getHeight() / 2; int m = Math.min(a, b); r = 4 * m / 5; int r2 = Math.abs(m - r) / 2; g2d.drawOval(a - r, b - r, 2 * r, 2 * r); g2d.setColor(Color.blue); for (int i = 0; i < n; i++) { double t = 2 * Math.PI * i / n; int x = (int) Math.round(a + r * Math.cos(t)); int y = (int) Math.round(b + r * Math.sin(t)); g2d.fillOval(x - r2, y - r2, 2 * r2, 2 * r2); } } private static void create() { JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.add(new CircleTest(9)); f.pack(); f.setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { create(); } }); } } </code></pre>
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Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. PODraw a circle with a radius and points around the edge
 singulars
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 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USCommunity
UserOwnerUserId
1. UStrashgod
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PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. PODraw a circle with a radius and points around the edge
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1. This table or related slice is empty.
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1. VO
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2. VO
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3. VO
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