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PO
 

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  1. PO
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    <p>I think you have several issues. It looks like you have a class like this:</p> <pre><code>public class Point { public double x; public double y; } </code></pre> <p>You should probably add a method to your class that looks like this:</p> <pre><code>public double distance(Point p) { return Math.hypot(this.x - p.x, this.y - p.y); } </code></pre> <p>And another one:</p> <pre><code>public Point getClosestPoint(List&lt;Point&gt; pts) { double minDistSoFar = Double.MAX_VALUE; Point rval = null; for (Point p : pts) { if (p.x == this.x &amp;&amp; p.y == this.y) { continue; } double pDist = this.distance(p); if (pDist &lt; minDistSoFar) { minDistSoFar = pDist; rval = p; } } } </code></pre> <p>Now your algorithm can become this:</p> <pre><code>public void connectingPoints() { ArrayList&lt;Point&gt; externals = new ArrayList&lt;Point&gt;(); for(Point p : externals) { Point minPoint = p.getClosestPoint(externals); getGraphics().drawLine(point.x, point.y, minPoint.x, minPoint.y); repaint(); } } </code></pre> <p>EDIT: Your original problem is probably that you index "i" in your loop examining the value of j. Also, here is a rewrite with a simple (and workable) rewrite of your code.</p> <pre><code>public void connectingPoints() { ArrayList&lt;Point&gt; externals = new ArrayList&lt;Point&gt;(); for(int i = 0; i&lt;externals.size(); i++) { Point point = externals.get(i); Point minPoint = externals.get((i+1) % externals.size()); int minXDistance = minPoint.x-point.x; int minYDistance = minPoint.y-point.y; double minDist = Math.hypot(minXDistance, minYDistance); for(int j = 0; j &lt; externals.size(); j++) // &lt;- you had i++ here! { if (i == j) { continue; } Point testPt = externals.get(j); double dist = Math.hypot(point.x - testPt.x, point.y - testPt.y); if (dist &lt; minDist) { minDist = dist; minPoint = testPt; } } getGraphics().drawLine(point.x, point.y, minPoint.x, minPoint.y); repaint(); } } </code></pre>
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    1. POconnect a point to each two closest point between different points
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    1. USTim Perry
    1. USTim Perry
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    1. POconnect a point to each two closest point between different points
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    1. VO
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      1. VTAcceptedByOriginator
    1. COGood catch on the i++ vs j++. Have an upvote.
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      1. USMark Storer
    2. COthanks Mark. Appreciate it.
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      1. USTim Perry
 

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