feat(工具箱): 完善“原神时钟”，添加背景图片

src/views/ToolboxView/Other/GenshinImpactClock/GenshinImpactClock.vue

@@ -1,6 +1,42 @@
 <template>
   <div class="tool-detail-page has-radius">
 
+    <!-- 背景图片 -->
+    <div
+      class="page-bg-wrapper"
+      :style="{ '--curr-time': Number(timeCurrValue) }"
+    >
+      <div
+        :style="{
+          '--bg-url': IMAGE_BG_DUSK,
+          '--self-hour-1': 18,
+          '--self-hour-2': 18,
+        }"
+      ></div>
+      <div
+        :style="{
+          '--bg-url': IMAGE_BG_MORNING,
+          '--self-hour-1': 6,
+          '--self-hour-2': 6,
+        }"
+      ></div>
+      <div
+        :style="{
+          '--bg-url': IMAGE_BG_NIGHT,
+          '--self-hour-1': 0,
+          '--self-hour-2': 24,
+        }"
+      ></div>
+      <div
+        :style="{
+          '--bg-url': IMAGE_BG_NOON,
+          '--self-hour-1': 12,
+          '--self-hour-2': 12,
+        }"
+      ></div>
+      <div class="page-bg-mask"></div>
+    </div>
+
     <!-- 左 -->
     <div class="page-column">
       <time-info />
@@ -55,7 +91,14 @@ import {
 } from 'vue';
 
 import {
-  isAutoRotating, isTimeTooEarly, isTimeExceeded,
+  IMAGE_BG_DUSK,
+  IMAGE_BG_MORNING,
+  IMAGE_BG_NIGHT,
+  IMAGE_BG_NOON,
+  isAutoRotating,
+  isTimeTooEarly,
+  isTimeExceeded,
+  timeCurrValue,
 } from './common-data';
 
 import ClockElement from './ClockElement.vue';
@@ -82,17 +125,63 @@ function handleConfirm() {
 
 <style lang="less" scoped>
 .tool-detail-page {
+  position: relative;
   background-color: #000;
   font-size: 16px;
   text-align: center;
   white-space: nowrap;
 }
 
+.page-bg-wrapper {
+  position: absolute;
+  left: 0;
+  top: 0;
+  z-index: 0;
+  width: 100%;
+  height: 100%;
+
+  > div {
+    // [小时 1 相关计算]
+    // 计算当前小时与背景对应小时的差值（可能为负数）
+    --hour-1-diff: calc(var(--self-hour-1) - var(--curr-time));
+    // 计算小时差值的绝对值
+    --hour-1-abs: ~"max(var(--hour-1-diff), var(--hour-1-diff) * -1)";
+    // 限制小时最大差值为 6
+    --hour-1-use: ~"min(6, var(--hour-1-abs))";
+    // [小时 2 相关计算，主要用于 0 点]
+    // 计算当前小时与背景所在小时的差值（可能为负数）
+    --hour-2-diff: calc(var(--self-hour-2) - var(--curr-time));
+    // 计算小时差值的绝对值
+    --hour-2-abs: ~"max(var(--hour-2-diff), var(--hour-2-diff) * -1)";
+    // 限制小时最大差值为 6
+    --hour-2-use: ~"min(6, var(--hour-2-abs))";
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 100%;
+    height: 100%;
+    background-image: var(--bg-url);
+    background-position: center;
+    background-repeat: no-repeat;
+    background-size: cover;
+    // 根据小时计算透明度
+    // 注：计算两个小时的透明度，取最大值
+    opacity: ~"calc((6 - min(var(--hour-1-use), var(--hour-2-use))) / 6)";
+  }
+
+  .page-bg-mask {
+    background-color: #000;
+    opacity: 0.75;
+  }
+}
+
 .page-column {
   display: inline-flex;
   align-items: center;
   flex-direction: column;
   justify-content: center;;
+  position: relative;
+  z-index: 10;
   vertical-align: middle;
   height: 100%;
   white-space: initial;