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copied!<p>You would need a stronger model to account for the time component of changes:</p> <ol> <li><p>Each sprite needs to maintain a queue of animation actions it is supposed to carry out. Adding animations to the queue should be a zero-time action (game time). Queued animations proceed on a frame-by-frame basis when they get a tick from the animation clock. Queuing lets you separate the model from the graphics subsystem and the animations.</p></li> <li><p>Each animation in the queue carries with it a model action to perform when the animation is complete. Some languages make that easier, e.g. with anonymous functions in C# or JavaScript. In other languages, you could use a callback instead. The model action lets you specify how the model would change when the animation completes.</p></li> <li><p>Sprites can carry high resolution coordinates (e.g. floating point), while the model stays with integer ones. Sprites don't need to know anything about the game rules though -- the queued animation-completion model-actions deal with that.</p></li> <li><p>Model entities should be able to account for a transitional states: appearing, disappearing, and moving. This lets you avoid checking the rules for objects in transition.</p></li> </ol> <p>To implement Snuffle's quest, you could then:</p> <ul> <li><p>User asked to move Snuffle north? -(1) check that the rules allow the move, (2) queue a <em>move animation</em> on Snuffle's sprite, coupled with a <em>landing</em> model action. Put the bunny's model into a transitional moving state.</p></li> <li><p>Snuffle's <em>landing</em> model action brings the bunny's model back to a normal state, and checks the landing spot and the rules. Finding a hat, it queues a potato appearance animation (the "merger") and two disappearance animations for the bunny and hat.</p></li> <li><p>The model actions for the disappearance animations delete the bunny and hat when complete.</p></li> </ul>

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