librodrome/app/components/ui/OiseauPose.vue

<script setup lang="ts">
// A bird of the librodrome placed on its block (composition of 03/11, docs/consignes-yvv.md):
// it stands on a real edge of the page, next to the content its trade is about.
// The host block is the positioning context: position relative, overflow visible.
//
// Poses
//   perche    on the block's top edge (bottom: 100%), x with left / right
//   marge-g   beside the block, on its left; feet at the block's bottom, raised by `bottom`
//   marge-d   the same, on its right
//   derriere  large and pale, behind the block (z-index -1): only what sticks out shows.
//             Needs a stacking context above the block (isolation: isolate) and a block
//             that creates none itself (no z-index, transform, opacity, filter).
//   libre     placed only by left / right / top / bottom (an empty area next to its block)
//
// Birds in the margin, behind a block or free need room around the column: they show from
// 1200 px wide, the perched ones from 768 px (`seuil` overrides, for instance 1024 for a perched
// bird whose block has no void above it until the grid splits in two); under 768 px, only a
// bird marked `mobile`.
// A perched bird needs, above its edge, a void at least as tall as itself (DA rule of 03/11);
// where blocks stand close, the bird goes in the margin or behind the block.
//
// Drawing rules of the studio DA (kit README, §2.5): one colour (currentColor), proportions
// intact and never cropped, 72 px wide at least, opacity 0.18-0.28 next to text and 0.10-0.14
// large behind a card, mirror allowed except for the calligraphe and the typographe.
// Birds standing on an edge do not move; only the one behind a card drifts a little (Yvv, 03/11).
import { OISEAUX } from '~/utils/oiseaux'

type Pose = 'perche' | 'marge-g' | 'marge-d' | 'derriere' | 'libre'

const props = withDefaults(defineProps<{
  nom: string
  pose?: Pose
  /** Width in px: S 72-90, M 108-156, L 200-250 */
  w?: number
  left?: string
  right?: string
  top?: string
  bottom?: string
  /** Gap between the block and a bird in the margin */
  ecart?: string
  retourne?: boolean
  /** Shown under 768 px (one bird per page at most) */
  mobile?: boolean
  /** Shown under 768 px only: the phone place of a bird placed elsewhere on wider screens */
  mobileSeul?: boolean
  /** Narrowest window (px) where the bird shows: 1200 by default for the margin, behind
   * and free poses, 768 for a perched bird */
  seuil?: 768 | 1024 | 1200
  ton?: 'primary' | 'accent'
  op?: number
}>(), { pose: 'perche', w: 80, ecart: '2.5rem', ton: 'primary' })

/** These two write and compose from left to right: never mirrored */
const NO_MIRROR = new Set(['calligraphe', 'typographe'])

const sol = computed(() => OISEAUX[props.nom]?.sol ?? 5)

const style = computed(() => {
  const s: Record<string, string> = { 'width': `${Math.max(72, props.w)}px`, '--sol': `${sol.value}%` }
  if (props.pose === 'perche') s.bottom = '100%'
  if (props.pose === 'marge-g') s.right = `calc(100% + ${props.ecart})`
  if (props.pose === 'marge-d') s.left = `calc(100% + ${props.ecart})`
  if (props.pose === 'marge-g' || props.pose === 'marge-d') s.bottom = '0px'
  for (const k of ['left', 'right', 'top', 'bottom'] as const) {
    if (props[k] !== undefined) s[k] = props[k]!
  }
  if (props.op !== undefined) s.opacity = String(props.op)
  return s
})

const classes = computed(() => [
  'oiseau-pose',
  `oiseau-pose--${props.pose}`,
  {
    'oiseau-pose--retourne': props.retourne && !NO_MIRROR.has(props.nom),
    'oiseau-pose--mobile': props.mobile || props.mobileSeul,
    'oiseau-pose--mobile-seul': props.mobileSeul,
    'oiseau-pose--large': (props.seuil ?? (props.pose === 'perche' ? 768 : 1200)) >= 1200,
    'oiseau-pose--moyen': props.seuil === 1024,
    'oiseau-pose--accent': props.ton === 'accent',
  },
])
</script>

<template>
  <UiOiseau :nom="nom" :class="classes" :style="style" :data-oiseau="nom" :data-pose="pose" />
</template>

<style scoped>
.oiseau-pose {
  position: absolute;
  z-index: 1;
  pointer-events: none;
  color: hsl(var(--color-primary));
  opacity: 0.24;
  /* The drawing's ground line lands on the edge */
  transform: translateY(var(--sol));
}

.oiseau-pose--accent {
  color: hsl(var(--color-accent));
}

.oiseau-pose--perche {
  opacity: 0.28;
}

.oiseau-pose--derriere {
  z-index: -1;
  opacity: 0.12;
  animation: oiseau-derive 12s ease-in-out infinite alternate;
}

.oiseau-pose--retourne {
  scale: -1 1;
}

@keyframes oiseau-derive {
  from { translate: 0 0; }
  to { translate: 0 -6px; }
}

@media (max-width: 1199px) {
  .oiseau-pose--large {
    display: none;
  }
}

@media (max-width: 1023px) {
  .oiseau-pose--moyen {
    display: none;
  }
}

@media (min-width: 768px) {
  .oiseau-pose--mobile-seul {
    display: none;
  }
}

@media (max-width: 767px) {
  .oiseau-pose:not(.oiseau-pose--mobile) {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .oiseau-pose--derriere {
    animation: none;
  }
}
</style>