1 files changed, 25 insertions, 0 deletions
diff --git a/src/lib/animations/blink.ts b/src/lib/animations/blink.ts
new file mode 100644
index 0000000..c291b06
--- /dev/null
+++ b/src/lib/animations/blink.ts
@@ -0,0 +1,25 @@
+import { sineOut } from 'svelte/easing';
+import type { AnimationConfig } from 'svelte/animate';
+
+export const blink = function blink(node: HTMLElement, params: AnimationConfig): AnimationConfig{
+
+  const originalWidth = parseFloat(getComputedStyle(node).width);
+  const originalHeight = parseFloat(getComputedStyle(node).height);
+
+  return {
+    delay: params.delay || 0,
+    duration: params.duration || 400,
+    easing: params.easing || sineOut,
+    css: (t: number): string => {
+
+      const halfWidth = originalWidth / 2;
+      const halfHeight = originalHeight / 2;
+      const height = Math.round(t <= 0.2 ? (originalHeight * t) / 0.2 : originalHeight);
+      const marginY = Math.round(t <= 0.2 ? halfHeight * (1 - t / 0.2) : 0);
+      const width = Math.round(t > 0.2 ? ((t - 0.2) / 0.8) * originalWidth : 0);
+      const marginX = Math.round(t > 0.2 ? (1 - (t - 0.2) / 0.8) * halfWidth : halfWidth);
+
+      return `width: ${width}px; height: ${height}px; margin: ${marginY}px ${marginX}px`;
+    }
+  };
+};