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POChange an image, according to the situation
 

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  1. POChange an image, according to the situation
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    <p>I am working on a class project it's a flight radar simulator.</p> <p>The situation is that when 2 planes are dangerously close the image of both flights changes, and when they are in a safe distance they change again.</p> <p><img src="https://i.stack.imgur.com/RiT7U.jpg" alt="Radar" title="Radar"></p> <p>The problem is that most of the time only one of those images is changed to red and I have no idea where the problem could be.</p> <p>This is the method I am using to check the closeness condition, very simple and only checking for distance between them.<br><br></p> <pre><code>private void checkConflicts(ArrayList&lt;Flight&gt; flightsInArea) { for (int i = 0; i &lt; flightsInArea.size(); i++) { for (int j = i + 1; j &lt; flightsInArea.size(); j++) { Coordinate currentFlight1 = flightsInArea.get(i).getCurrentPosition(); Coordinate currentFlight2 = flightsInArea.get(j).getCurrentPosition(); double cathetusX = Math.pow((currentFlight1.getPositionX() - currentFlight2.getPositionX()), 2); double cathetusY = Math.pow((currentFlight1.getPositionY() - currentFlight2.getPositionY()), 2); double distance = Math.sqrt(cathetusX + cathetusY); if (distance &lt; 100) { flightsInArea.get(i).establishImage(true); flightsInArea.get(j).establishImage(true); } else { flightsInArea.get(i).establishImage(false); flightsInArea.get(j).establishImage(false); } } } } </code></pre> <p>This is the method use to establish the new image.</p> <pre><code>public void establishImage(boolean conflict) { try { if (conflict) { image = ImageIO.read(this.getClass().getResource("red_plane.png")); } else { image = ImageIO.read(this.getClass().getResource("blue_plane.png")); } } catch (IOException ex) { Logger.getLogger(Vuelo.class.getName()).log(Level.SEVERE, null, ex); } } </code></pre>
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    1. USsandiego
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    1. COWon't solve your problem, but you should NOT be reading the image from desk every time you do your check. The images should be read into memory when you start your program.
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      1. UScamickr
    2. COThanks, I'll follow your advice.
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      1. USsandiego
    3. CO["Aircraft use a slightly modified version of polar coordinates for navigation,"](http://en.wikipedia.org/wiki/Polar_coordinate_system#Position_and_navigation) seen [here](http://stackoverflow.com/a/12607586/230513).
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      1. UStrashgod
 

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