improve: fine-tuning parameters of lyrics

src/lib/components/lyrics/lyricLine.svelte

@@ -5,7 +5,6 @@
     import type { Spring } from '$lib/graphics/spring/spring';
 
     const viewportWidth = document.documentElement.clientWidth;
-    const scaleCurrentLine = viewportWidth > 640 ? 1.02 : 1.045 ;
 
     export let line: ScriptItem;
     export let index: number;
@@ -18,7 +17,6 @@
     let time = 0;
     let positionX: number = 0;
     let positionY: number = 0;
-    let scale = 1;
     let opacity = 1;
     let stopped = false;
     let lastPosX: number | undefined = undefined;
@@ -76,7 +74,6 @@
     export const setCurrent = (isCurrent: boolean) => {
         isCurrentLyric = isCurrent;
         opacity = isCurrent ? 1 : 0.36;
-        scale = isCurrent ? scaleCurrentLine : 1;
     };
 
     export const setBlur = (blur: number) => {
@@ -112,8 +109,8 @@
         lastPosY = pos.y;
         positionX = pos.x;
         positionY = pos.y;
-        springX = createSpring(pos.x, pos.x, 0.126, 0.8);
+        springX = createSpring(pos.x, pos.x, 0.114, 0.72);
-        springY = createSpring(pos.y, pos.y, 0.126, 0.8);
+        springY = createSpring(pos.y, pos.y, 0.114, 0.72);
     };
 
     export const stop = () => {
@@ -126,31 +123,36 @@
 <!-- svelte-ignore a11y-click-events-have-key-events -->
 <!-- svelte-ignore a11y-no-static-element-interactions -->
 <div
-    style="transform: translate3d({positionX}px, {positionY}px, 0); scale: {scale}; 
+    style="transform: translate3d({positionX}px, {positionY}px, 0); transition-property: opacity, text-shadow; 
-    transition-property: scale, opacity; transition-duration: 0.5s; transition-timing-function: ease-in-out; opacity: {opacity};
+    transition-duration: 0.36s; transition-timing-function: ease-out; opacity: {opacity};
     transform-origin: center left;"
     class="absolute z-50 w-full pr-12 lg:pr-16 cursor-default py-5"
     bind:this={ref}
     on:touchstart={() => {
-        clickMask.style.backgroundColor = "rgba(255,255,255,.3)";
+        clickMask.style.backgroundColor = 'rgba(255,255,255,.3)';
     }}
     on:touchend={() => {
-        clickMask.style.backgroundColor = "transparent";
+        clickMask.style.backgroundColor = 'transparent';
     }}
     on:click={() => {
         lyricClick(index);
     }}
 >
-    <span class="absolute w-[calc(100%-2.5rem)] lg:w-[calc(100%-2.75rem)] h-full 
+    <span
-    -translate-x-2 lg:-translate-x-5 -translate-y-5 rounded-lg duration-300 lg:hover:bg-[rgba(255,255,255,.15)]" bind:this={clickMask}>
+        class="absolute w-[calc(100%-2.5rem)] lg:w-[calc(100%-3rem)] h-full
-
+        -translate-x-2 lg:-translate-x-5 -translate-y-5 rounded-lg duration-300 lg:hover:bg-[rgba(255,255,255,.15)]"
+        bind:this={clickMask}
+    >
     </span>
     {#if debugMode}
         <span class="text-lg absolute -translate-y-7">
             {index}: duration: {(line.end - line.start).toFixed(3)}, {line.start.toFixed(3)}~{line.end.toFixed(3)}
         </span>
     {/if}
-    <span class={`text-white text-[2rem] leading-9 lg:text-5xl lg:leading-[4rem] font-semibold text-shadow-lg mr-4`}>
+    <span
+        class={`text-white text-[2rem] leading-9 lg:text-5xl lg:leading-[4rem] font-semibold text-shadow-lg mr-4
+    ${isCurrentLyric ? 'text-glow' : ''}`}
+    >
         {line.text}
     </span>
     {#if line.translation}
@@ -160,3 +162,13 @@
         </span>
     {/if}
 </div>
+
+<style>
+    .text-glow {
+        text-shadow:
+            0 0 3px #ffffff2c,
+            0 0 6px #ffffff2c,
+            0 15px 30px rgba(0, 0, 0, 0.11),
+            0 5px 15px rgba(0, 0, 0, 0.08);
+    }
+</style>

src/lib/components/lyrics/newLyrics.svelte

@@ -8,7 +8,7 @@
     // constants
     const viewportHeight = document.documentElement.clientHeight;
     const viewportWidth = document.documentElement.clientWidth;
-    const marginY = viewportWidth > 640 ? 36 : 0 ;
+    const marginY = viewportWidth > 640 ? 12 : 0 ;
     const blurRatio = viewportWidth > 640 ? 1 : 1.4;
     const currentLyrictTop = viewportWidth > 640 ? viewportHeight * 0.12 : viewportHeight * 0.05;
     const deceleration = 0.95; // Velocity decay factor for inertia
@@ -57,7 +57,7 @@
     }
 
     function initLyricTopList() {
-        let cumulativeHeight = 0;
+        let cumulativeHeight = currentLyrictTop;
         for (let i = 0; i < lyricLines.length; i++) {
             const c = lyricComponents[i];
             lyricElements.push(c.getRef());
@@ -77,10 +77,14 @@
         for (let i = 0; i < lyricElements.length; i++) {
             const currentLyricComponent = lyricComponents[i];
             let delay = 0;
-            if (i <= currentLyricIndex) {
+            if (i < currentLyricIndex) {
                 delay = 0;
-            } else {
+            } 
-                delay = 0.013 + Math.min(Math.min(currentLyricDuration, 0.1), 0.075 * (i - currentLyricIndex));
+            else if (i == currentLyricIndex) {
+                delay = 0.042;
+            }
+            else {
+                delay = Math.min(Math.min(currentLyricDuration, 0.6), 0.067 * (i - currentLyricIndex+1.2));
             }
             const offset = Math.abs(i - currentLyricIndex);
             let blurRadius = Math.min(offset * blurRatio, 16);