csharp
/
MonoGame.Samples
mirror of https://github.com/CartBlanche/MonoGame-Samples.git


			
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</head><body><div id="mainSection"><div id="mainBody">
  <h1>Flocking Sample</h1>

 This sample demonstrates how AIs can use simple rules to move together and create complex behaviors.

  <a name="ID2EK"></a><h1 class="heading">Sample Overview</h1><div id="ID2EK" class="hxnx1">
    

    <p>
      When programming the AI for your game, you often want your actors to move and react together without having to behave identically. For example, you might want to simulate a school of fish that all swim together without a centralized control or a battalion of soldiers that can march together in formation around obstacles. 

This sample demonstrates some of these behaviors. The sample has a flock of birds that fly to, and in the same direction as, other birds they see nearby. The sample also has a cat that you can turn on and who then chases the birds as they run away. 

This sample is based on the Chase and Evade sample, and assumes that the reader is familiar with the code and concepts explained in that sample. 

    </p>

          
      <p>This sample uses the following controls.</p>
      <table>
        <tr>
          <th>Action</th>
          <th style="width: 192px">Windows Phone</th>
          <th>Windows - Keyboard Control</th>
          <th>Windows/Xbox - Gamepad Control</th>
        </tr>
        <tr>
          <td>Select the tuning parameter.</td>
          <td style="width: 192px"><strong>DRAG</strong> tuning bar</td>
          <td>UP ARROW, DOWN ARROW</td>
          <td>D-Pad Up and Down</td>
        </tr>
        <tr>
          <td>Increase/decrease the tuning parameter.</td>
          <td style="width: 192px"><strong>DRAG </strong>tuning bar</td>
          <td>LEFT ARROW, RIGHT ARROW</td>
          <td>
            D-Pad Left and Right, Left and Right Triggers</td>
        </tr>
        <tr>
          <td>Reset the bird flock.</td>
          <td style="width: 192px"><strong>TAP</strong> &quot;Reset Flock&quot; button</td>
          <td>X</td>
          <td>
            X</td>
        </tr>
        <tr>
          <td>Reset the tuning parameters.</td>
          <td style="width: 192px"><strong>TAP</strong> &quot;Reset Distance&quot; button</td>
          <td>B</td>
          <td>B</td>
        </tr>
        <tr>
          <td>Add/remove the cat</td>
          <td style="width: 192px"><strong>TAP</strong> &quot;Add/Remove Cat&quot; button</td>
          <td>Y</td>
          <td>
            Y</td>
        </tr>
        <tr>
          <td>Move the cat.</td>
          <td style="width: 192px"><strong>TAP </strong>or <strong>DRAG </strong>
		  on screen</td>
          <td>W, S, A, D</td>
          <td>
            Left Thumbstick</td>
        </tr>
        <tr>
          <td>Exit the game.</td>
          <td style="width: 192px"><strong>BACK</strong></td>
          <td>ESC or ALT+F4</td>
          <td>
            <b>BACK</b>
          </td>
        </tr>
      </table>
    </div>
  </div>

  <a name="ID2EHE"></a><h1 class="heading">How the Sample Works</h1><div id="ID2EHE" class="hxnx1">
    

    <p>
      &nbsp;</p>
		<h2 class="subHeading">Flocking Behavior</h2>
		<div id="ID2E1D" class="hxnx2">
			<p>Flocking behavior is controlled by three simple behaviors: 
			cohesion, alignment, and separation. Other behaviors can be present, 
			but they are not required. In this sample, the birds also have a 
			flee behavior. </p>
			<p>Cohesion is the birds’ tendency to fly together with others. 
			Alignment is the birds’ tendency to fly in the same direction as 
			other birds. Separation is the birds’ tendency to fly away from 
			others that are too close. Fleeing is the birds’ tendency to avoid 
			dangerous things. </p>
			<a name="ID2ECE"></a>
			<h4 class="subHeading">Cohesion</h4>
			<div id="ID2ECE" class="hxnx3">
				<p>Each bird flies towards others it can see. To make one bird 
				fly closer to another, for each other bird inside its <b>
				detectionDist</b> value, the bird changes its <b>direction</b> 
				towards the other bird in proportion to its <b>
				moveInFlockDirInfluence</b> setting and according to how close 
				it is to the midpoint between its <b>detectionDist</b> and <b>
				separationDist</b> values. </p>
			</div>
			<a name="ID2EUE"></a>
			<h4 class="subHeading">Alignment</h4>
			<div id="ID2EUE" class="hxnx3">
				<p>Each bird flies in the general direction of others it can 
				see. To make one bird line up with another, for each other bird 
				inside its <b>detectionDist</b> value, the bird adds the <b>
				direction</b> the other bird is facing to its own <b>direction</b> 
				in proportion to its <b>moveInFlockDirInfluence</b> setting. </p>
			</div>
			<a name="ID2EEF"></a>
			<h4 class="subHeading">Separation</h4>
			<div id="ID2EEF" class="hxnx3">
				<p>Each bird flies away from others that that are too close. For 
				each other bird inside both its <b>detectionDist</b> <i>and</i> 
				its <b>separationDist</b> values, the bird applies the 
				separation rule instead of the cohesion rule. To move one bird a 
				comfortable distance away from another, the bird adds the 
				opposite of the direction towards the other bird&#39;s direction to 
				its <b>direction</b> in proportion to its <b>
				moveInFlockDirInfluence</b> setting and according to the ratio 
				of how close the other bird is relative to its <b>separationDist</b> 
				value. </p>
			</div>
			<a name="ID2EYF"></a>
			<h4 class="subHeading">Flee</h4>
			<div id="ID2EYF" class="hxnx3">
				<p>Each bird flies away from the cat if the bird can see the 
				cat. To move a bird away from the cat, if the cat is inside the 
				bird&#39;s <b>detectionDist</b> and the bird isn&#39;t already moving 
				away from the cat, the bird adds the opposite of the direction 
				towards the cat to its <b>direction</b> value.</p>
			</div>
		</div>

  </div>

  <a name="ID2EAH"></a><h1 class="heading">Extending the Sample</h1><div id="ID2EAH" class="hxnx1">
    

    	<ul>
			<li>Make one bird in the flock the leader and give it the wander 
			behavior from the Chase and Evade sample. Then make the other birds 
			in the flock follow the leader. </li>
			<li>Add different colored flocks and make the birds fly with their 
			own kind and avoid other birds. </li>
			<li>Add formations. </li>
			<li>Add predator birds that chase the others.</li>
		</ul>
  </div>

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	<a href="mailto:[email protected]?subject=Documentation Feedback: Flocking Sample">
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