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POMovement "algorithm" in client-server Multiplayer (MMO) Games?
 

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  1. POMovement "algorithm" in client-server Multiplayer (MMO) Games?
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    <p>I've been writing a 2D flash multiplayer game and a socket server. My original plan for the movement algorithm between the client and server was the following:</p> <ul> <li>The client informs the server about the player's movement mode (moving forward or not moving) and the player's turning mode (not turning, turning left or turning right) whenever these change. <ul> <li>The server loops all players every few milliseconds and calculates the angle turned and distance moved, based on the difference in time. The same calculation is done by the client.</li> </ul></li> </ul> <p>My current calculation for the client (same math is used in server) ==></p> <p><strong>Turning</strong></p> <pre><code>var newTimeStamp:uint = UtilLib.getTimeStamp(); //set current timeStamp var rot:uint = Math.round((newTimeStamp - turningTimeStamp) / 1000 * 90); //speed = x degrees turning every 1 second turningTimeStamp = newTimeStamp; //update timeStamp if (turningMode == 1) //left { movementAngle = fixAngle(movementAngle - rot); } else if (turningMode == 2) //right { movementAngle = fixAngle(movementAngle + rot); } private function fixAngle(angle:int):uint //fixes an angle in degrees (365 -&gt; 5, -5 -&gt; 355, etc.) { if (angle &gt; 360) { angle -= (Math.round(angle / 360) * 360); } else if (angle &lt; 0) { angle += (Math.round(Math.abs(angle) / 360) + 1) * 360; } return angle; } </code></pre> <p><strong>Movement</strong></p> <pre><code>var newTimeStamp:uint = UtilLib.getTimeStamp(); //set current timeStamp var distance:uint = Math.round((newTimeStamp - movementTimeStamp) / 1000 * 300); //speed = x pixels forward every 1 second movementTimeStamp = newTimeStamp; //update old timeStamp var diagonalChange:Array = getDiagonalChange(movementAngle, distance); //with the current angle, howmuch is dX and dY? x += diagonalChange[0]; y += diagonalChange[1]; private function getDiagonalChange(angle:uint, distance:uint):Array { var rAngle:Number = angle * Math.PI/180; return [Math.round(Math.sin(rAngle) * distance), Math.round((Math.cos(rAngle) * distance) * -1)]; } </code></pre> <p>This seems to work great. In order to take lag into account, the server corrects the client's info every now and then by sending this data.</p> <p>With this system very little bandwidth is used to handle movement. However, the differences between my server and the client's coordinates and angles are too big. Should I maybe extend my "algorithm", to also take into account the latency a user has? Or are there better ways of handling movement in client&lt;>server multiplayer games with great performance?</p>
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