Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { computed, onBeforeUnmount, onMounted, ref } from 'vue'
import { RotateCcw } from '@lucide/vue'
import Button from '@/components/ui/button/button.vue'
defineOptions({ inheritAttrs: false })
/* ---------- props ---------- */
const props = defineProps({
/** 采样间隔（毫秒）：FPS 上报与柱状图刷新周期 */
sampleInterval: { type: Number, default: 500 },
/** 柱状图保留的历史帧数 */
historySize: { type: Number, default: 48 },
/** 基准 FPS：用于颜色分级与柱高换算 */
baseFps: { type: Number, default: 60 },
})
/* ---------- 公共状态 ---------- */
const currentFps = ref(0)
const averageFps = ref(0)
const minimumFps = ref(null)
const history = ref([])
/* 非法入参归一化：采样间隔/帧数/基准值过低时取最小值，避免除零或空图 */
const normalizedSampleInterval = computed(() => Math.max(100, props.sampleInterval))
const normalizedHistorySize = computed(() => Math.max(1, Math.floor(props.historySize)))
const normalizedBaseFps = computed(() => Math.max(1, props.baseFps))
/* rAF 循环高频写入的窗口计数保持普通变量，避免无谓的响应式开销 */
let animationFrameId = 0
let sampleFrames = 0
let sampleStartedAt = 0
let totalFrames = 0
let totalTime = 0
/* ---------- FPS 采样 ---------- */
function resetSampleWindow() {
sampleFrames = 0
sampleStartedAt = performance.now()
}
function tick(now) {
sampleFrames += 1
totalFrames += 1
const elapsed = now - sampleStartedAt
if (elapsed >= normalizedSampleInterval.value) {
const fps = Math.round((sampleFrames * 1000) / elapsed)
currentFps.value = fps
minimumFps.value = minimumFps.value == null ? fps : Math.min(minimumFps.value, fps)
totalTime += elapsed
averageFps.value = Math.round((totalFrames * 1000) / totalTime)
history.value = [...history.value, fps].slice(-normalizedHistorySize.value)
sampleFrames = 0
sampleStartedAt = now
}
animationFrameId = requestAnimationFrame(tick)
}
/* ---------- 统计重置 ---------- */
function reset() {
currentFps.value = 0
averageFps.value = 0
minimumFps.value = null
history.value = []
totalFrames = 0
totalTime = 0
resetSampleWindow()
}
/* 切后台时浏览器暂停 rAF，恢复前台后重置采样窗口，避免把暂停时长计入均值 */
function handleVisibilityChange() {
if (!document.hidden) resetSampleWindow()
}
/* ---------- 颜色分级与柱状图 ---------- */
function getFpsColor(fps) {
if (fps >= normalizedBaseFps.value * (5 / 6)) return 'var(--fms-success)'
if (fps >= normalizedBaseFps.value / 2) return 'var(--fms-warning)'
return 'var(--fms-danger)'
}
const currentFpsColor = computed(() => getFpsColor(currentFps.value))
/* 柱高按基准 FPS 换算并夹在 8%–100%，保证低帧率时仍有可见柱体 */
const barStyles = computed(() =>
history.value.map((fps) => {
const height = Math.max(8, Math.min(100, (fps / normalizedBaseFps.value) * 100))
return {
height: `${height}%`,
backgroundColor: getFpsColor(fps),
}
}),
)
/* ---------- 生命周期 ---------- */
onMounted(() => {
resetSampleWindow()
document.addEventListener('visibilitychange', handleVisibilityChange)
animationFrameId = requestAnimationFrame(tick)
})
onBeforeUnmount(() => {
cancelAnimationFrame(animationFrameId)
document.removeEventListener('visibilitychange', handleVisibilityChange)
})
</script>
<template>
<aside class="fps-monitor" aria-label="FPS 性能监控" v-bind="$attrs">
<div class="fps-monitor__header">
<span class="fps-monitor__label">FPS</span>
<strong class="fps-monitor__current" :style="{ color: currentFpsColor }">
{{ currentFps || '--' }}
</strong>
<Button
type="ghost"
class="fps-monitor__reset"
title="重置统计"
aria-label="重置 FPS 统计"
@click="reset"
>
<RotateCcw />
</Button>
</div>
<div class="fps-monitor__chart" aria-hidden="true">
<span v-for="(bar, index) in barStyles" :key="index" class="fps-monitor__bar" :style="bar" />
</div>
<div class="fps-monitor__summary">
<span
>avg <b>{{ averageFps || '--' }}</b></span
>
<span
>min <b>{{ minimumFps ?? '--' }}</b></span
>
</div>
</aside>
</template>
<style scoped lang="scss">
.fps-monitor {
position: fixed;
top: 8px;
right: 8px;
z-index: var(--fms-z-popover);
display: flex;
flex-direction: column;
gap: 6px;
width: 132px;
padding: 8px 10px;
color: var(--fms-text);
font-size: 12px;
line-height: 1.4;
letter-spacing: 0;
user-select: none;
background: var(--fms-card);
border: 1px solid var(--fms-border);
border-radius: var(--fms-control-radius);
box-shadow: var(--fms-popover-shadow);
}
.fps-monitor__header {
display: flex;
align-items: center;
gap: 6px;
min-height: 24px;
}
.fps-monitor__label {
color: var(--fms-text-secondary);
font-weight: 600;
}
.fps-monitor__current {
flex: 1;
font-size: 18px;
font-variant-numeric: tabular-nums;
line-height: 1;
}
.fps-monitor__chart {
display: flex;
align-items: flex-end;
gap: 1px;
height: 32px;
overflow: hidden;
}
.fps-monitor__bar {
flex: 1;
min-width: 0;
border-radius: 1px;
}
.fps-monitor__summary {
display: flex;
justify-content: space-between;
color: var(--fms-text-secondary);
}
.fps-monitor__summary b {
color: var(--fms-text);
font-variant-numeric: tabular-nums;
}
/* 重置按钮：组件库 Button 无 size 枚举，在 ghost 变体基础上压缩为 20×20 小方钮 */
.fps-monitor .fps-monitor__reset {
display: inline-flex;
align-items: center;
justify-content: center;
flex-shrink: 0;
width: 20px;
height: 20px;
min-height: 0;
padding: 0;
border: none;
border-radius: var(--fms-control-radius);
font-size: 14px;
line-height: 1;
color: var(--fms-text-secondary);
cursor: pointer;
transition:
background-color 150ms ease,
color 150ms ease;
&:hover {
background: var(--fms-secondary-hover);
color: var(--fms-text);
}
}
</style>
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