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xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-c4656e6d><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-c4656e6d><!--[--><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Introduction</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/getting-started/setup" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Setting Up</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/getting-started/updating" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Updating Profectus</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/getting-started/examples" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Example Projects</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="https://github.com/profectus-engine/Profectus/blob/main/CHANGELOG.md" target="_blank" rel="noreferrer" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Profectus Changelog</p><!--]--><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" height="24px" viewbox="0 0 24 24" width="24px" class="icon" data-v-8f4dc553><path d="M0 0h24v24H0V0z" fill="none"></path><path d="M9 5v2h6.59L4 18.59 5.41 20 17 8.41V15h2V5H9z"></path></svg></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-139a1f1d><section class="VPSidebarItem level-0 collapsible" data-v-139a1f1d data-v-c4656e6d><div class="item" role="button" tabindex="0" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><h2 class="text" data-v-c4656e6d>Creating Your Project</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-c4656e6d><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-c4656e6d><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-c4656e6d><!--[--><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/creating-your-project/project-info" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Project Info</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/creating-your-project/project-entry" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Project Entry</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/creating-your-project/changelog" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Changelog</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/creating-your-project/themes" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Themes</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/creating-your-project/utils" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Utilities</p><!--]--><!----></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-139a1f1d><section class="VPSidebarItem level-0 collapsible" data-v-139a1f1d data-v-c4656e6d><div class="item" role="button" tabindex="0" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><h2 class="text" data-v-c4656e6d>Important Concepts</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-c4656e6d><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-c4656e6d><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-c4656e6d><!--[--><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/important-concepts/layers" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Layers</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/important-concepts/features" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Features</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/important-concepts/coercable" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Coercable Components</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/important-concepts/reactivity" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Reactivity</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/important-concepts/persistence" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Persistence</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/important-concepts/requirements" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Requirements</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/important-concepts/formulas" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Formulas</p><!--]--><!----></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-139a1f1d><section class="VPSidebarItem level-0 collapsible has-active" data-v-139a1f1d data-v-c4656e6d><div class="item" role="button" tabindex="0" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><h2 class="text" data-v-c4656e6d>Recipes</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-c4656e6d><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-c4656e6d><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-c4656e6d><!--[--><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/recipes/save-progress" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Display Save Progress</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link is-active has-active" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/recipes/particles" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Display Particle Effect</p><!--]--><!----></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-139a1f1d><section class="VPSidebarItem level-0 collapsible" data-v-139a1f1d data-v-c4656e6d><div class="item" role="button" tabindex="0" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><h2 class="text" data-v-c4656e6d>Advanced Concepts</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-c4656e6d><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-c4656e6d><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-c4656e6d><!--[--><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/advanced-concepts/creating-features" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Creating Features</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/advanced-concepts/dynamic-layers" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Dynamic Layers</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c4656e6d data-v-c4656e6d><div class="item" data-v-c4656e6d><div class="indicator" data-v-c4656e6d></div><a class="VPLink link link" href="/guide/advanced-concepts/nodes" data-v-c4656e6d data-v-8f4dc553><!--[--><p class="text" data-v-c4656e6d>Nodes</p><!--]--><!----></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-b2cf3e0b data-v-a494bd1d><div class="VPDoc has-sidebar has-aside" data-v-a494bd1d data-v-c4b0d3cf><!--[--><!--]--><div class="container" data-v-c4b0d3cf><div class="aside" data-v-c4b0d3cf><div class="aside-curtain" data-v-c4b0d3cf></div><div class="aside-container" data-v-c4b0d3cf><div class="aside-content" data-v-c4b0d3cf><div class="VPDocAside" data-v-c4b0d3cf data-v-3f215769><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" data-v-3f215769 data-v-ff0f39c8><div class="content" data-v-ff0f39c8><div class="outline-marker" data-v-ff0f39c8></div><div class="outline-title" data-v-ff0f39c8>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-ff0f39c8><span class="visually-hidden" id="doc-outline-aria-label" data-v-ff0f39c8> Table of Contents for current page </span><ul class="root" data-v-ff0f39c8 data-v-8f12e865><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-3f215769></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-c4b0d3cf><div class="content-container" data-v-c4b0d3cf><!--[--><!--]--><!----><main class="main" data-v-c4b0d3cf><div style="position:relative;" class="vp-doc _guide_recipes_particles" data-v-c4b0d3cf><div><h1 id="particles" tabindex="-1">Particles <a class="header-anchor" href="#particles" aria-label="Permalink to &quot;Particles&quot;"></a></h1><p>This is a more comprehensive example based on the Kronos example used in the <a href="./../advanced-concepts/nodes">nodes</a> docs. You will design a particle effect, make it appear on another feature, and ensure it adapts to the game state.</p><h2 id="design-the-effect" tabindex="-1">Design the Effect <a class="header-anchor" href="#design-the-effect" aria-label="Permalink to &quot;Design the Effect&quot;"></a></h2><p>First, design the particle effect. Profectus uses <a href="https://github.com/pixijs/particle-emitter" target="_blank" rel="noreferrer">pixi-particles</a>, and you can use the online particle effect editor <a href="http://pixijs.github.io/pixi-particles-editor/" target="_blank" rel="noreferrer">here</a>. However, the editor returns an older format of the particle effect emitter config, so you&#39;ll need to convert it like this:</p><div class="language-ts"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#89DDFF;font-style:italic;">import</span><span style="color:#A6ACCD;"> myParticleEffect </span><span style="color:#89DDFF;font-style:italic;">from</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">myParticleEffect.json</span><span style="color:#89DDFF;">&quot;</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#89DDFF;font-style:italic;">import</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">upgradeConfig</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;font-style:italic;">from</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">@pixi/particle-emitter</span><span style="color:#89DDFF;">&quot;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C792EA;">const</span><span style="color:#A6ACCD;"> particleEffect </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">upgradeConfig</span><span style="color:#A6ACCD;">(myParticleEffect)</span><span style="color:#89DDFF;">;</span></span></code></pre></div><h2 id="create-the-particles" tabindex="-1">Create the Particles <a class="header-anchor" href="#create-the-particles" aria-label="Permalink to &quot;Create the Particles&quot;"></a></h2><p>Next, create the particles feature and render it. You&#39;ll also want to track the bounding rect of the particle effects. Consider the following step:</p><div class="language-ts"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#C792EA;">const</span><span style="color:#A6ACCD;"> particles </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">createParticles</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=&gt;</span><span style="color:#A6ACCD;"> (</span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#F07178;">fullscreen</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#FF9CAC;">false</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#F07178;">zIndex</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">-</span><span style="color:#F78C6C;">1</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#F07178;">boundingRect</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">ref</span><span style="color:#89DDFF;">&lt;</span><span style="color:#FFCB6B;">null</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">|</span><span style="color:#A6ACCD;"> </span><span style="color:#FFCB6B;">DOMRect</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">null</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#F07178;">onContainerResized</span><span style="color:#89DDFF;">(</span><span style="color:#A6ACCD;font-style:italic;">boundingRect</span><span style="color:#89DDFF;">)</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">this.</span><span style="color:#A6ACCD;">boundingRect</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">value</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">boundingRect</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">))</span><span style="color:#89DDFF;">;</span></span></code></pre></div><p>This code adds a bounding rect for the particles and updates it when the container is created or resizes.</p><h2 id="adding-the-effect" tabindex="-1">Adding the Effect <a class="header-anchor" href="#adding-the-effect" aria-label="Permalink to &quot;Adding the Effect&quot;"></a></h2><p>Now, create the emitter. Pull in the Kronos example, which displays a particle effect when <code>actualGain &gt; 0</code>.</p><div class="language-ts"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#C792EA;">const</span><span style="color:#A6ACCD;"> particlesEmitter </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">ref</span><span style="color:#A6ACCD;">(particles</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">addEmitter</span><span style="color:#A6ACCD;">(element</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">particlesConfig))</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#C792EA;">const</span><span style="color:#A6ACCD;"> updateParticleEffect </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">async</span><span style="color:#A6ACCD;"> ([shouldEmit</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> rect</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> boundingRect]</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> [</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#FFCB6B;">boolean</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#FFCB6B;">DOMRect</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">|</span><span style="color:#A6ACCD;"> </span><span style="color:#FFCB6B;">undefined</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#FFCB6B;">DOMRect</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">|</span><span style="color:#A6ACCD;"> </span><span style="color:#FFCB6B;">undefined</span></span>
<span class="line"><span style="color:#A6ACCD;">]) </span><span style="color:#C792EA;">=&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#C792EA;">const</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">emitter</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;font-style:italic;">await</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">particlesEmitter</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">value</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">emitter</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">emit</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">isGaining</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">&amp;&amp;</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">rect</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">!=</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">undefined</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">&amp;&amp;</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">boundingRect</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">!=</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">undefined;</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#F07178;"> (</span><span style="color:#A6ACCD;">emitter</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">emit</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">&amp;&amp;</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">!</span><span style="color:#A6ACCD;">emitter</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">destroyed</span><span style="color:#F07178;">) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">emitter</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">cleanup</span><span style="color:#F07178;">()</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">emitter</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">updateOwnerPos</span><span style="color:#F07178;">(</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">rect</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">x</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">rect</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">width</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">/</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">2</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">-</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">boundingRect</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">x</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">rect</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">y</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">rect</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">height</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">/</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">2</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">-</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">boundingRect</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">y</span></span>
<span class="line"><span style="color:#F07178;"> )</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">emitter</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">resetPositionTracking</span><span style="color:#F07178;">()</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#89DDFF;">};</span></span>
<span class="line"><span style="color:#82AAFF;">watch</span><span style="color:#A6ACCD;">(</span></span>
<span class="line"><span style="color:#A6ACCD;"> [</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=&gt;</span><span style="color:#A6ACCD;"> Decimal</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">gt</span><span style="color:#A6ACCD;">(actualGain</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">value</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=&gt;</span><span style="color:#A6ACCD;"> layer</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">nodes</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">value[name]</span><span style="color:#89DDFF;">?.</span><span style="color:#A6ACCD;">rect</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;"> particles</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">boundingRect</span></span>
<span class="line"><span style="color:#A6ACCD;"> ]</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;"> updateParticleEffect</span></span>
<span class="line"><span style="color:#A6ACCD;">)</span></span></code></pre></div><p>This code watches for whether the node exists and the <code>boundingRect</code> exists, which are required to display the effect. You can additionally watch any other values that would have an impact on the particle effect, like whether or not it should be emitting.</p><h2 id="support-hot-reloading" tabindex="-1">Support Hot Reloading <a class="header-anchor" href="#support-hot-reloading" aria-label="Permalink to &quot;Support Hot Reloading&quot;"></a></h2><p>If you&#39;re using hot reloading, you might need to reload the particle effect. Here&#39;s an example from Kronos of adding the callback to the particles constructor:</p><div class="language-ts"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#C792EA;">const</span><span style="color:#A6ACCD;"> particles </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">createParticles</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=&gt;</span><span style="color:#A6ACCD;"> (</span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#F07178;">fullscreen</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#FF9CAC;">false</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#F07178;">zIndex</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">-</span><span style="color:#F78C6C;">1</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#F07178;">boundingRect</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">ref</span><span style="color:#89DDFF;">&lt;</span><span style="color:#FFCB6B;">null</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">|</span><span style="color:#A6ACCD;"> </span><span style="color:#FFCB6B;">DOMRect</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">null</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#F07178;">onContainerResized</span><span style="color:#89DDFF;">(</span><span style="color:#A6ACCD;font-style:italic;">boundingRect</span><span style="color:#89DDFF;">)</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">this.</span><span style="color:#A6ACCD;">boundingRect</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">value</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">boundingRect</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">},</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#F07178;">onHotReload</span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">Object</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">values</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;">elements</span><span style="color:#F07178;">)</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">forEach</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;font-style:italic;">element</span><span style="color:#F07178;"> </span><span style="color:#C792EA;">=&gt;</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">element</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">refreshParticleEffect</span><span style="color:#F07178;">())</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">))</span><span style="color:#89DDFF;">;</span></span></code></pre></div><p>The <code>refreshParticleEffect</code> function destroys the emitter, creates a new one, and updates it:</p><div class="language-ts"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#C792EA;">const</span><span style="color:#A6ACCD;"> refreshParticleEffect </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">particlesEmitter</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">value</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">then</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;font-style:italic;">e</span><span style="color:#F07178;"> </span><span style="color:#C792EA;">=&gt;</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">e</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">destroy</span><span style="color:#F07178;">())</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">then</span><span style="color:#F07178;">(</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">()</span><span style="color:#F07178;"> </span><span style="color:#C792EA;">=&gt;</span></span>
<span class="line"><span style="color:#F07178;"> (</span><span style="color:#A6ACCD;">particlesEmitter</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">value</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">particles</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">addEmitter</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;">element</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">particlesConfig</span><span style="color:#F07178;">))</span></span>
<span class="line"><span style="color:#F07178;"> )</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">then</span><span style="color:#F07178;">(</span><span style="color:#89DDFF;">()</span><span style="color:#F07178;"> </span><span style="color:#C792EA;">=&gt;</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#82AAFF;">updateParticleEffect</span><span style="color:#F07178;">([</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">Decimal</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">gt</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;">actualGain</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">value</span><span style="color:#89DDFF;">,</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">0</span><span style="color:#F07178;">)</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">layer</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">nodes</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">value</span><span style="color:#F07178;">[</span><span style="color:#A6ACCD;">name</span><span style="color:#F07178;">]</span><span style="color:#89DDFF;">?.</span><span style="color:#A6ACCD;">rect</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">particles</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">boundingRect</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">value</span></span>
<span class="line"><span style="color:#F07178;"> ])</span></span>
<span class="line"><span style="color:#F07178;"> )</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#89DDFF;">};</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-c4b0d3cf data-v-face870a><!--[--><!--]--><div class="edit-info" data-v-face870a><div class="edit-link" data-v-face870a><a class="VPLink link edit-link-button" href="https://github.com/profectus-engine/profectus-docs/edit/main/docs/guide/recipes/particles.md" target="_blank" rel="noreferrer" data-v-face870a data-v-8f4dc553><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-face870a><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--><!----></a></div><div class="last-updated" data-v-face870a><p class="VPLastUpdated" data-v-face870a data-v-7b3ebfe1>Last updated: <time datetime="2023-04-11T12:50:19.000Z" data-v-7b3ebfe1></time></p></div></div><div class="prev-next" data-v-face870a><div class="pager" data-v-face870a><a class="pager-link prev" href="/guide/recipes/save-progress" data-v-face870a><span class="desc" data-v-face870a>Previous page</span><span class="title" data-v-face870a>Display Save Progress</span></a></div><div class="has-prev pager" data-v-face870a><a class="pager-link next" href="/guide/advanced-concepts/creating-features" data-v-face870a><span class="desc" data-v-face870a>Next page</span><span class="title" data-v-face870a>Creating Features</span></a></div></div></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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