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10-animation.html
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<p><code>#frame_index</code> is a method DragonRuby GTK gives us on integers to keep track of what frame to use when animating. <code>0</code> is when we want to start the animation, which we want to start at the beginning of our game. We have 6 frames in our animation, and we want to display each of them for 8 ticks, repeating forever! Change the <code>hold_for</code> value and see how it affects the animation speed and feel of the game. Pick a rate that feels good for you or just stick with 8.</p>
<p>Then we take the <code>player_sprite_index</code> and use that when specifying the <code>path</code> of our player sprite by interpolating it into the path to our sprite. Our dragon frames are named <code>dragon-0.png</code>, <code>dragon-1.png</code>, and so on. So we take what <code>#frame_index</code> gives us and inject it into the path to the image, making that value dynamic. Remember string interpolation from Chapter 1? It comes into play all the time when coding.</p>
<h2 id="a-note-on-spritesheets"><a class="header" href="#a-note-on-spritesheets">A Note on Spritesheets</a></h2>
<p>If you've done any game development before, you may be familiar with spritesheets, where each frame of an animation is contained within one image file. When using a spritesheet for animation, instead of changing which image file path is used for the sprite to render, you change which piece of the large spritesheet you render. <a href="http://docs.dragonruby.org/#----animation-using-sprite-sheet---main-rb">The DragonRuby GTK docs have a detailed example of how to do this.</a></p>
<p>If you've done any game development before, you may be familiar with spritesheets, where each frame of an animation is contained within one image file. When using a spritesheet for animation, instead of changing which image file path is used for the sprite to render, you change which piece of the large spritesheet you render. <a href="https://docs.dragonruby.org/#/samples/rendering-sprites?id=animation-using-sprite-sheet-mainrb">The DragonRuby GTK docs have a detailed example of how to do this.</a></p>
<h2 id="extra-credit"><a class="header" href="#extra-credit">Extra Credit</a></h2>
<ul>
<li>How would you increase the animation speed when the dragon is moving to simulate faster flapping of their wings?</li>

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