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<template>
<div class="flex relative" :class="{'flex-col': vert}"
:style="{color: store.color.text}" ref="rootRef">
<div v-for="p in periods" :key="p.label" class="relative" :style="periodStyles(p)">
<div :style="labelStyles">{{p.label}}</div>
<div v-if="props.vert" class="absolute bottom-0 w-full h-6"
style="background-image: linear-gradient(to bottom, rgba(0,0,0,0), rgba(0,0,0,1))"></div>
</div>
<TransitionGroup name="fade" v-if="mounted">
<div v-for="(state, idx) in timelines" :key="state.id" class="absolute" :style="spanStyles(idx)"></div>
</TransitionGroup>
</div>
</template>
<script setup lang="ts">
import {ref, computed, onMounted, PropType, Ref} from 'vue';
import {MIN_DATE, MAX_DATE, SCALES, MONTH_SCALE, DAY_SCALE, WRITING_MODE_HORZ, TimelineState, stepDate} from '../lib';
import {useStore} from '../store';
// Refs
const rootRef = ref(null as HTMLElement | null);
// Global store
const store = useStore();
// Props
const props = defineProps({
vert: {type: Boolean, required: true},
timelines: {type: Object as PropType<TimelineState[]>, required: true},
});
// Static time periods
type Period = {label: string, len: number};
const periods: Ref<Period[]> = ref([
{label: 'Pre Hadean', len: 8},
{label: 'Hadean', len: 1},
{label: 'Archaean', len: 1.5},
{label: 'Proterozoic', len: 2},
{label: 'Phanerozoic', len: 0.5},
]);
// For skipping transitions on startup
const skipTransition = ref(true);
onMounted(() => setTimeout(() => {skipTransition.value = false}, 100));
// For size and mount-status tracking
const width = ref(0);
const height = ref(0);
const mounted = ref(false);
onMounted(() => {
let rootEl = rootRef.value!;
width.value = rootEl.offsetWidth;
height.value = rootEl.offsetHeight;
mounted.value = true;
})
const resizeObserver = new ResizeObserver((entries) => {
for (const entry of entries){
if (entry.contentBoxSize){
const boxSize = Array.isArray(entry.contentBoxSize) ? entry.contentBoxSize[0] : entry.contentBoxSize;
width.value = WRITING_MODE_HORZ ? boxSize.inlineSize : boxSize.blockSize;
height.value = WRITING_MODE_HORZ ? boxSize.blockSize : boxSize.inlineSize;
}
}
});
onMounted(() => resizeObserver.observe(rootRef.value as HTMLElement));
// Styles
function periodStyles(period: Period){
return {
backgroundColor: store.color.bgDark2,
outline: '1px solid gray',
flexGrow: period.len,
overflow: 'hidden',
};
}
const labelStyles = computed((): Record<string, string> => ({
transform: props.vert ? 'rotate(90deg) translate(50%, 0)' : 'none',
whiteSpace: 'nowrap',
width: props.vert ? '40px' : 'auto',
padding: props.vert ? '0' : '4px',
}));
function spanStyles(stateIdx: number){
const state = props.timelines[stateIdx];
let styles: Record<string,string>;
const availLen = props.vert ? height.value : width.value;
const availBreadth = props.vert ? width.value : height.value;
// Determine start/end date
if (state.startOffset == null || state.endOffset == null || state.scaleIdx == null){
return {display: 'none'};
}
let start = state.startDate.clone();
let end = state.endDate.clone();
let scale = SCALES[state.scaleIdx];
if (scale != MONTH_SCALE && scale != DAY_SCALE){ // Account for offsets
stepDate(start, 1, {forward: false, count: Math.floor(state.startOffset * scale), inplace: true});
stepDate(end, 1, {count: Math.floor(state.endOffset * scale), inplace: true});
}
// Determine positions in full timeline (only uses year information)
let startFrac = (start.year - MIN_DATE.year) / (MAX_DATE.year - MIN_DATE.year);
let lenFrac = (end.year - start.year) / (MAX_DATE.year - MIN_DATE.year);
let startPx = Math.max(0, availLen * startFrac); // Prevent negatives due to end-padding
let lenPx = Math.min(availLen - startPx, availLen * lenFrac);
if (lenPx < 3){ // Prevent zero length
lenPx = 3;
startPx -= Math.max(0, startPx + lenPx - availLen);
}
// Account for multiple timelines
const breadth = availBreadth / props.timelines.length;
const sidePx = breadth * stateIdx;
//
if (props.vert){
styles = {
top: startPx + 'px',
left: sidePx + 'px',
height: lenPx + 'px',
width: breadth + 'px',
}
} else {
styles = {
top: sidePx + 'px',
left: startPx + 'px',
height: breadth + 'px',
width: lenPx + 'px',
}
}
return {
...styles,
transition: skipTransition.value ? 'none' : 'all 300ms ease-out',
color: 'black',
backgroundColor: store.color.alt,
opacity: 0.6,
borderWidth: '1px',
borderColor: store.color.bg,
};
}
</script>
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