scrawl-canvas
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<h1 id="tween-mixin">Tween mixin</h1>
<p>This mixin defines attributes and functions shared by <a href="../factory/tween.html">Tween</a> objects and <a href="../factory/action.html">Action</a> objects</p>
<ul>
<li><a href="../factory/ticker.html">Ticker</a> objects do not use this mixin</li>
</ul>
</div>
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<h4 id="imports">Imports</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">import</span> * <span class="hljs-keyword">as</span> library <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/library.js'</span>;
<span class="hljs-keyword">import</span> { animationtickers } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/library.js'</span>;
<span class="hljs-keyword">import</span> { mergeOver, isa_fn, isa_obj, xt, xtGet, convertTime, λ<span class="hljs-literal">null</span>, Ωempty } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/utilities.js'</span>;</pre></div></div>
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<p><strong>locateTarget</strong> - a private function and attribute to help retrieve data from the scrawl-canvas library</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> locateTargetSections = [<span class="hljs-string">'artefact'</span>, <span class="hljs-string">'group'</span>, <span class="hljs-string">'animation'</span>, <span class="hljs-string">'tween'</span>, <span class="hljs-string">'styles'</span>];
<span class="hljs-keyword">const</span> <span class="hljs-title function_">locateTarget</span> = (<span class="hljs-params">item</span>) => {
<span class="hljs-keyword">if</span>(item && item.<span class="hljs-property">substring</span>){
<span class="hljs-keyword">let</span> result;
<span class="hljs-keyword">return</span> (locateTargetSections.<span class="hljs-title function_">some</span>(<span class="hljs-function"><span class="hljs-params">section</span> =></span> {
result = library[section][item];
<span class="hljs-keyword">return</span> result;
})) ? result : <span class="hljs-literal">false</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
};</pre></div></div>
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<h4 id="export-function">Export function</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-keyword">function</span> (<span class="hljs-params">P = Ωempty</span>) {</pre></div></div>
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<h4 id="shared-attributes">Shared attributes</h4>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> defaultAttributes = {</pre></div></div>
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<p><strong>order</strong> - integer Number (defaults to <code>1</code>) - the order in which Tween/Actions run is determined by their order value: Tween/Actions with a lower order value run before those with a higher value</p>
<ul>
<li>Run order for Tween/Actions with the same order value is determined by the order in which they are defined in code</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">order</span>: <span class="hljs-number">1</span>,</pre></div></div>
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<p><strong>ticker</strong> - String - the name-String of the Ticker the Tween/Action uses for its timeline</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">ticker</span>: <span class="hljs-string">''</span>,</pre></div></div>
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<p><strong>targets</strong> - Array containing the Scrawl-canvas objects on which the Tween/Action will act; one Tween/Action can modify attributes in multiple objects</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">targets</span>: <span class="hljs-literal">null</span>,</pre></div></div>
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<p><strong>time</strong> - the timeline time when the Tween/Action activates and runs.</p>
<ul>
<li>Tween/Actions given a time value of <code>0</code> will run as soon as their associated Ticker timeline runs; values greater than 0 will delay their run until that time is reached on the timeline.</li>
<li>Time can be set as a Number value representing microseconds</li>
<li>It can also be set as a time string - <code>3s</code> is 3000 milliseconds; <code>200ms</code> is 200 milliseconds</li>
<li>Or it can be set as a percentage String - <code>30%</code> - measured against the duration of the Ticker timeline.</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">time</span>: <span class="hljs-number">0</span>,</pre></div></div>
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<p><strong>action</strong> - a user-defined function which will run every time the Tween/Action completes an update - generally once each Display cycle while the Tween/Action is running</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">action</span>: <span class="hljs-literal">null</span>,</pre></div></div>
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<p><strong>reverseOnCycleEnd</strong> - Boolean flag; when set, the Tween/Action will reverse its direction and continue running, rather than halt.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">reverseOnCycleEnd</span>: <span class="hljs-literal">false</span>,</pre></div></div>
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<p><strong>reversed</strong> - internal Boolean flag indicating whether the Tween/Action is running in <code>forwards</code> or <code>backwards</code> mode</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">reversed</span>: <span class="hljs-literal">false</span>,
};
P.<span class="hljs-property">defs</span> = <span class="hljs-title function_">mergeOver</span>(P.<span class="hljs-property">defs</span>, defaultAttributes);</pre></div></div>
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<h4 id="packet-management">Packet management</h4>
<p>No additional packet functionality defined here</p>
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<h4 id="clone-management">Clone management</h4>
<p>No additional clone functionality defined here</p>
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<h4 id="kill-management">Kill management</h4>
</div>
<div class="content"><div class='highlight'><pre> P.<span class="hljs-property">kill</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">let</span> t,
ticker = <span class="hljs-variable language_">this</span>.<span class="hljs-property">ticker</span>;
<span class="hljs-keyword">if</span> (ticker === <span class="hljs-string">`<span class="hljs-subst">${<span class="hljs-variable language_">this</span>.name}</span>_ticker`</span>) {
t = animationtickers[ticker];
<span class="hljs-keyword">if</span> (t) t.<span class="hljs-title function_">kill</span>();
}
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (ticker) <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">removeFromTicker</span>(ticker);
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">deregister</span>();
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
};</pre></div></div>
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<h4 id="get-set-deltaset">Get, Set, deltaSet</h4>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> G = P.<span class="hljs-property">getters</span>,
S = P.<span class="hljs-property">setters</span>;</pre></div></div>
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<p><strong>targets</strong></p>
<ul>
<li>the getter returns a fresh copy of the current targets Array</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre> G.<span class="hljs-property">targets</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">return</span> [].<span class="hljs-title function_">concat</span>(<span class="hljs-variable language_">this</span>.<span class="hljs-property">targets</span>);
};
S.<span class="hljs-property">targets</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item = []</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">setTargets</span>(item);
};</pre></div></div>
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<p><strong>action</strong></p>
</div>
<div class="content"><div class='highlight'><pre> S.<span class="hljs-property">action</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">action</span> = item;
<span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> <span class="hljs-variable language_">this</span>.<span class="hljs-property">action</span> !== <span class="hljs-string">'function'</span>) <span class="hljs-variable language_">this</span>.<span class="hljs-property">action</span> = λ<span class="hljs-literal">null</span>;
};</pre></div></div>
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<h4 id="prototype-functions">Prototype functions</h4>
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<p><code>calculateEffectiveTime</code>
The <em><strong>effective time</strong></em> is the time, relative to the Tween/Action’s associated Ticker timeline, when the Tween/Action will start running</p>
</div>
<div class="content"><div class='highlight'><pre> P.<span class="hljs-property">calculateEffectiveTime</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">let</span> time = <span class="hljs-title function_">xtGet</span>(item, <span class="hljs-variable language_">this</span>.<span class="hljs-property">time</span>),
calculatedTime = <span class="hljs-title function_">convertTime</span>(time),
cTime = calculatedTime[<span class="hljs-number">1</span>],
cType = calculatedTime[<span class="hljs-number">0</span>],
ticker,
tickerDuration = <span class="hljs-number">0</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">effectiveTime</span> = <span class="hljs-number">0</span>;
<span class="hljs-keyword">if</span> (cType === <span class="hljs-string">'%'</span> && cTime <= <span class="hljs-number">100</span>) {
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">ticker</span>) {
ticker = animationtickers[<span class="hljs-variable language_">this</span>.<span class="hljs-property">ticker</span>];
<span class="hljs-keyword">if</span> (ticker) {
tickerDuration = ticker.<span class="hljs-property">effectiveDuration</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">effectiveTime</span> = tickerDuration * (cTime / <span class="hljs-number">100</span>);
}
}
}
<span class="hljs-keyword">else</span> <span class="hljs-variable language_">this</span>.<span class="hljs-property">effectiveTime</span> = cTime;
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
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<p><code>addToTicker</code></p>
</div>
<div class="content"><div class='highlight'><pre> P.<span class="hljs-property">addToTicker</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">let</span> tick;
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">xt</span>(item)) {
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">ticker</span> && <span class="hljs-variable language_">this</span>.<span class="hljs-property">ticker</span> !== item) <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">removeFromTicker</span>(<span class="hljs-variable language_">this</span>.<span class="hljs-property">ticker</span>);
tick = animationtickers[item];
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">xt</span>(tick)) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">ticker</span> = item;
tick.<span class="hljs-title function_">subscribe</span>(<span class="hljs-variable language_">this</span>.<span class="hljs-property">name</span>);
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">calculateEffectiveTime</span>();
}
}
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
</li>
<li id="section-22">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-22">§</a>
</div>
<p><code>removeFromTicker</code></p>
</div>
<div class="content"><div class='highlight'><pre> P.<span class="hljs-property">removeFromTicker</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">let</span> tick;
item = (<span class="hljs-title function_">xt</span>(item)) ? item : <span class="hljs-variable language_">this</span>.<span class="hljs-property">ticker</span>;
<span class="hljs-keyword">if</span> (item) {
tick = animationtickers[item];
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">xt</span>(tick)) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">ticker</span> = <span class="hljs-string">''</span>;
tick.<span class="hljs-title function_">unsubscribe</span>(<span class="hljs-variable language_">this</span>.<span class="hljs-property">name</span>);
}
}
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
</li>
<li id="section-23">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-23">§</a>
</div>
<p><code>setTargets</code></p>
</div>
<div class="content"><div class='highlight'><pre> P.<span class="hljs-property">setTargets</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">items</span>) {
items = [].<span class="hljs-title function_">concat</span>(items);
<span class="hljs-keyword">let</span> newTargets = [];
items.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">item</span> =></span> {
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_fn</span>(item)) {
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_fn</span>(item.<span class="hljs-property">set</span>)) newTargets.<span class="hljs-title function_">push</span>(item);
}
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_obj</span>(item) && <span class="hljs-title function_">xt</span>(item.<span class="hljs-property">name</span>)) newTargets.<span class="hljs-title function_">push</span>(item);
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">let</span> result = <span class="hljs-title function_">locateTarget</span>(item);
<span class="hljs-keyword">if</span> (result) newTargets.<span class="hljs-title function_">push</span>(result);
}
});
<span class="hljs-variable language_">this</span>.<span class="hljs-property">targets</span> = newTargets;
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
</li>
<li id="section-24">
<div class="annotation">
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<a class="ss" href="#section-24">§</a>
</div>
<p><code>addToTargets</code></p>
</div>
<div class="content"><div class='highlight'><pre> P.<span class="hljs-property">addToTargets</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">items</span>) {
items = [].<span class="hljs-title function_">concat</span>(items);
items.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">item</span> =></span> {
<span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> item === <span class="hljs-string">'function'</span>) {
<span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> item.<span class="hljs-property">set</span> === <span class="hljs-string">'function'</span>) <span class="hljs-variable language_">this</span>.<span class="hljs-property">targets</span>.<span class="hljs-title function_">push</span>(item);
}
<span class="hljs-keyword">else</span> {
result = <span class="hljs-title function_">locateTarget</span>(item);
<span class="hljs-keyword">if</span> (result) <span class="hljs-variable language_">this</span>.<span class="hljs-property">targets</span>.<span class="hljs-title function_">push</span>(result);
}
}, <span class="hljs-variable language_">this</span>);
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
</li>
<li id="section-25">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-25">§</a>
</div>
<p><code>removeFromTargets</code></p>
</div>
<div class="content"><div class='highlight'><pre> P.<span class="hljs-property">removeFromTargets</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">items</span>) {
items = [].<span class="hljs-title function_">concat</span>(items);
<span class="hljs-keyword">let</span> identifiers = [],
newTargets = [].<span class="hljs-title function_">concat</span>(<span class="hljs-variable language_">this</span>.<span class="hljs-property">targets</span>);
newTargets.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">target</span> =></span> {
<span class="hljs-keyword">let</span> type = target.<span class="hljs-property">type</span> || <span class="hljs-string">'unknown'</span>,
name = target.<span class="hljs-property">name</span> || <span class="hljs-string">'unnamed'</span>;
<span class="hljs-keyword">if</span> (type !== <span class="hljs-string">'unknown'</span> && name !== <span class="hljs-string">'unnamed'</span>) identifiers.<span class="hljs-title function_">push</span>(<span class="hljs-string">`<span class="hljs-subst">${type}</span>_<span class="hljs-subst">${name}</span>`</span>);
});
items.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">item</span> =></span> {
<span class="hljs-keyword">let</span> myObj;
<span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> item === <span class="hljs-string">'function'</span>) myObj = item;
<span class="hljs-keyword">else</span> myObj = <span class="hljs-title function_">locateTarget</span>(item);
<span class="hljs-keyword">if</span> (myObj) {
<span class="hljs-keyword">let</span> type = myObj.<span class="hljs-property">type</span> || <span class="hljs-string">'unknown'</span>,
name = myObj.<span class="hljs-property">name</span> || <span class="hljs-string">'unnamed'</span>;
<span class="hljs-keyword">if</span> (type !== <span class="hljs-string">'unknown'</span> && name !== <span class="hljs-string">'unnamed'</span>) {
<span class="hljs-keyword">let</span> objName = <span class="hljs-string">`<span class="hljs-subst">${type}</span>_<span class="hljs-subst">${name}</span>`</span>,
doRemove = identifiers.<span class="hljs-title function_">indexOf</span>(objName);
<span class="hljs-keyword">if</span> (doRemove >= <span class="hljs-number">0</span>) newTargets[doRemove] = <span class="hljs-literal">false</span>;
}
}
});
<span class="hljs-variable language_">this</span>.<span class="hljs-property">targets</span> = [];
newTargets.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">target</span> =></span> {
<span class="hljs-keyword">if</span> (target) <span class="hljs-variable language_">this</span>.<span class="hljs-property">targets</span>.<span class="hljs-title function_">push</span>(target);
}, <span class="hljs-variable language_">this</span>);
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
</li>
<li id="section-26">
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<a class="ss" href="#section-26">§</a>
</div>
<p><code>checkForTarget</code></p>
</div>
<div class="content"><div class='highlight'><pre> P.<span class="hljs-property">checkForTarget</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">if</span> (!item.<span class="hljs-property">substring</span>) <span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>.<span class="hljs-property">targets</span>.<span class="hljs-title function_">some</span>(<span class="hljs-function"><span class="hljs-params">t</span> =></span> t.<span class="hljs-property">name</span> === item);
};
P.<span class="hljs-property">run</span> = λ<span class="hljs-literal">null</span>;
P.<span class="hljs-property">isRunning</span> = λ<span class="hljs-literal">null</span>;
P.<span class="hljs-property">halt</span> = λ<span class="hljs-literal">null</span>;
P.<span class="hljs-property">reverse</span> = λ<span class="hljs-literal">null</span>;
P.<span class="hljs-property">resume</span> = λ<span class="hljs-literal">null</span>;
P.<span class="hljs-property">seekTo</span> = λ<span class="hljs-literal">null</span>;
P.<span class="hljs-property">seekFor</span> = λ<span class="hljs-literal">null</span>;</pre></div></div>
</li>
<li id="section-27">
<div class="annotation">
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<a class="ss" href="#section-27">§</a>
</div>
<p>Return the prototype</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">return</span> P;
};</pre></div></div>
</li>
</ul>
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