Add Crosshair animation component

src/content/Animations/Crosshair/Crosshair.vue

@@ -0,0 +1,249 @@
+<template>
+  <div
+    ref="cursorRef"
+    :style="{
+      position: containerRef ? 'absolute' : 'fixed',
+      top: 0,
+      left: 0,
+      width: '100%',
+      height: '100%',
+      pointerEvents: 'none',
+      zIndex: 10000
+    }"
+  >
+    <svg
+      :style="{
+        position: 'absolute',
+        left: 0,
+        top: 0,
+        width: '100%',
+        height: '100%'
+      }"
+    >
+      <defs>
+        <filter id="filter-noise-x">
+          <feTurbulence
+            type="fractalNoise"
+            baseFrequency="0.000001"
+            numOctaves="1"
+            ref="filterXRef"
+          />
+          <feDisplacementMap in="SourceGraphic" scale="40" />
+        </filter>
+        <filter id="filter-noise-y">
+          <feTurbulence
+            type="fractalNoise"
+            baseFrequency="0.000001"
+            numOctaves="1"
+            ref="filterYRef"
+          />
+          <feDisplacementMap in="SourceGraphic" scale="40" />
+        </filter>
+      </defs>
+    </svg>
+    <div
+      ref="lineHorizontalRef"
+      :style="{
+        position: 'absolute',
+        width: '100%',
+        height: '1px',
+        background: color,
+        pointerEvents: 'none',
+        transform: 'translateY(50%)',
+        opacity: 0
+      }"
+    />
+    <div
+      ref="lineVerticalRef"
+      :style="{
+        position: 'absolute',
+        height: '100%',
+        width: '1px',
+        background: color,
+        pointerEvents: 'none',
+        transform: 'translateX(50%)',
+        opacity: 0
+      }"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { onMounted, onUnmounted, useTemplateRef, watchEffect, type Ref } from 'vue';
+import { gsap } from 'gsap';
+
+interface Props {
+  color?: string;
+  containerRef?: HTMLElement | null;
+}
+
+const props = withDefaults(defineProps<Props>(), {
+  color: 'white',
+  containerRef: null
+});
+
+const cursorRef = useTemplateRef<HTMLDivElement>('cursorRef');
+const lineHorizontalRef = useTemplateRef<HTMLDivElement>('lineHorizontalRef');
+const lineVerticalRef = useTemplateRef<HTMLDivElement>('lineVerticalRef');
+const filterXRef = useTemplateRef<SVGFETurbulenceElement>('filterXRef');
+const filterYRef = useTemplateRef<SVGFETurbulenceElement>('filterYRef');
+
+const lerp = (a: number, b: number, n: number): number => (1 - n) * a + n * b;
+
+const getMousePos = (e: MouseEvent, container: HTMLElement | null) => {
+  if (container) {
+    const bounds = container.getBoundingClientRect();
+    return {
+      x: e.clientX - bounds.left,
+      y: e.clientY - bounds.top
+    };
+  }
+  return { x: e.clientX, y: e.clientY };
+};
+
+let mouse = { x: 0, y: 0 };
+let animationId: number | null = null;
+let cleanup: (() => void) | null = null;
+
+onMounted(() => {
+  watchEffect(() => {
+    if (cleanup) {
+      cleanup();
+    }
+
+    const handleMouseMove = (ev: Event) => {
+      const mouseEvent = ev as MouseEvent;
+      mouse = getMousePos(mouseEvent, props.containerRef);
+
+      if (props.containerRef) {
+        const bounds = props.containerRef.getBoundingClientRect();
+        if (
+          mouseEvent.clientX < bounds.left ||
+          mouseEvent.clientX > bounds.right ||
+          mouseEvent.clientY < bounds.top ||
+          mouseEvent.clientY > bounds.bottom
+        ) {
+          gsap.to([lineHorizontalRef.value, lineVerticalRef.value], { opacity: 0 });
+        } else {
+          gsap.to([lineHorizontalRef.value, lineVerticalRef.value], { opacity: 1 });
+        }
+      }
+    };
+
+    const target = props.containerRef || window;
+    target.addEventListener('mousemove', handleMouseMove);
+
+    const renderedStyles: {
+      [key: string]: { previous: number; current: number; amt: number };
+    } = {
+      tx: { previous: 0, current: 0, amt: 0.15 },
+      ty: { previous: 0, current: 0, amt: 0.15 }
+    };
+
+    gsap.set([lineHorizontalRef.value, lineVerticalRef.value], { opacity: 0 });
+
+    const onMouseMove = () => {
+      renderedStyles.tx.previous = renderedStyles.tx.current = mouse.x;
+      renderedStyles.ty.previous = renderedStyles.ty.current = mouse.y;
+
+      gsap.to([lineHorizontalRef.value, lineVerticalRef.value], {
+        duration: 0.9,
+        ease: 'Power3.easeOut',
+        opacity: 1
+      });
+
+      if (animationId === null) {
+        animationId = requestAnimationFrame(render);
+      }
+
+      target.removeEventListener('mousemove', onMouseMove);
+    };
+
+    target.addEventListener('mousemove', onMouseMove);
+
+    const primitiveValues = { turbulence: 0 };
+
+    const tl = gsap
+      .timeline({
+        paused: true,
+        onStart: () => {
+          if (lineHorizontalRef.value && lineVerticalRef.value) {
+            lineHorizontalRef.value.style.filter = 'url(#filter-noise-x)';
+            lineVerticalRef.value.style.filter = 'url(#filter-noise-y)';
+          }
+        },
+        onUpdate: () => {
+          if (filterXRef.value && filterYRef.value) {
+            filterXRef.value.setAttribute('baseFrequency', primitiveValues.turbulence.toString());
+            filterYRef.value.setAttribute('baseFrequency', primitiveValues.turbulence.toString());
+          }
+        },
+        onComplete: () => {
+          if (lineHorizontalRef.value && lineVerticalRef.value) {
+            lineHorizontalRef.value.style.filter = 'none';
+            lineVerticalRef.value.style.filter = 'none';
+          }
+        }
+      })
+      .to(primitiveValues, {
+        duration: 0.5,
+        ease: 'power1',
+        startAt: { turbulence: 1 },
+        turbulence: 0
+      });
+
+    const enter = () => tl.restart();
+    const leave = () => tl.progress(1).kill();
+
+    const render = () => {
+      renderedStyles.tx.current = mouse.x;
+      renderedStyles.ty.current = mouse.y;
+
+      for (const key in renderedStyles) {
+        renderedStyles[key].previous = lerp(
+          renderedStyles[key].previous,
+          renderedStyles[key].current,
+          renderedStyles[key].amt
+        );
+      }
+
+      if (lineHorizontalRef.value && lineVerticalRef.value) {
+        gsap.set(lineVerticalRef.value, { x: renderedStyles.tx.previous });
+        gsap.set(lineHorizontalRef.value, { y: renderedStyles.ty.previous });
+      }
+
+      animationId = requestAnimationFrame(render);
+    };
+
+    const links = props.containerRef
+      ? props.containerRef.querySelectorAll('a')
+      : document.querySelectorAll('a');
+
+    links.forEach((link: HTMLAnchorElement) => {
+      link.addEventListener('mouseenter', enter);
+      link.addEventListener('mouseleave', leave);
+    });
+
+    cleanup = () => {
+      target.removeEventListener('mousemove', handleMouseMove);
+      target.removeEventListener('mousemove', onMouseMove);
+      
+      if (animationId !== null) {
+        cancelAnimationFrame(animationId);
+        animationId = null;
+      }
+      
+      links.forEach((link: HTMLAnchorElement) => {
+        link.removeEventListener('mouseenter', enter);
+        link.removeEventListener('mouseleave', leave);
+      });
+    };
+  });
+
+  onUnmounted(() => {
+    if (cleanup) {
+      cleanup();
+    }
+  });
+});
+</script>