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<template>
<div class="flex relative" :class="{'flex-col': vert}"
:style="{color: store.color.text, padding: PADDING + 'px'}" ref="rootRef">
<!-- Time periods -->
<div v-for="p in periods" :key="p.label" class="relative" :style="periodStyles(p)">
<div :style="labelStyles">{{p.label}}</div>
<!-- Fade-out div for overflowing text -->
<div :style="fadeDivStyles"></div>
</div>
<!-- Timeline 'spans' -->
<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, stepDate, TimelineState} from '../lib';
import {useStore} from '../store';
const rootRef = ref(null as HTMLElement | null);
const store = useStore();
const props = defineProps({
vert: {type: Boolean, required: true},
len: {type: Number, required: true},
timelines: {type: Object as PropType<TimelineState[]>, required: true},
});
const PADDING = 8;
const contentLen = computed(() => props.len - PADDING * 2)
const contentBreadth = computed(() => store.baseLineBreadth - PADDING * 2)
// ========== 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 mounted = ref(false);
onMounted(() => mounted.value = true);
// ========== For 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 ? contentBreadth.value + 'px' : 'auto',
height: props.vert ? 'auto' : contentBreadth.value + 'px',
padding: props.vert ? '0' : '4px',
}));
const MIN_SPAN_LEN = 3;
function spanStyles(stateIdx: number){
const state = props.timelines[stateIdx];
let styles: Record<string,string>;
// 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, contentLen.value * startFrac);
let lenPx = Math.min(contentLen.value - startPx, contentLen.value * lenFrac);
if (lenPx < MIN_SPAN_LEN){ // Prevent zero length
lenPx = MIN_SPAN_LEN;
startPx -= Math.max(0, startPx + lenPx - contentLen.value);
}
// Account for multiple timelines
const breadth = contentBreadth.value / props.timelines.length;
let sidePx = breadth * stateIdx;
startPx += PADDING;
sidePx += PADDING;
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',
backgroundColor: store.color.alt,
opacity: 0.6,
borderWidth: '1px',
borderColor: store.color.bgDark2,
};
}
const fadeDivStyles = computed((): Record<string, string> => ({
position: 'absolute',
bottom: '0',
right: '0',
width: props.vert ? '100%' : '24px',
height: props.vert ? '24px' : '100%',
backgroundImage: props.vert
? 'linear-gradient(to bottom, rgba(0,0,0,0), rgba(0,0,0,1))'
: 'linear-gradient(to right, rgba(0,0,0,0), rgba(0,0,0,1))',
}));
</script>
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