Published
Edited
Jan 15, 2020
timelines = [
{ start: 0, end: 20 },
{ start: 9, end: 16 },
{ start: 4, end: 30 },
{ start: 8, end: 21 },
{ start: 15, end: 30 },
{ start: 15, end: 30 },
{ start: 17, end: 30 },
{ start: 27, end: 40 },
{ start: 3, end: 21 },
{ start: 8, end: 43 },
{ start: 20, end: 23 },
{ start: 18, end: 24 },
]
chart = {
const height = 100;
const svg = d3.create("svg")
.attr("viewBox", [0, 0, 600, height])
.attr("height", 200);
const g = svg.append('g');
const yScale = (x) => (height - x);
sortedTimelines.forEach((timeline, timelineIndex)=> {
for (let t = timeline.start; t <= timeline.end; t++) {
const t0 = t;
const t1 = t+1;
const height0 = heightAtTime(timelineIndex, t0);
const height1 = heightAtTime(timelineIndex, t1);
const y0 = yAtTime(timelineIndex, t0);
const y1 = yAtTime(timelineIndex, t1);
const x0 = DT_WIDTH*t0;
const x1 = DT_WIDTH*t1;
const d = `M ${x0} ${yScale(y0)} L ${x0} ${yScale(y0+height0)} L ${x1} ${yScale(y1+height1)} L ${x1} ${yScale(y1)} z`;
g.append('path')
.attr("d", d)
.attr('fill', d3.interpolateCool(timelineIndex/(sortedTimelines.length-1)));
}
});
return svg.node();
}
function weightAtTime(timelineIndex, time) {
const timeline = sortedTimelines[timelineIndex];
const { start, end } = timeline;
const MAX = 4;
if (time < start || time > end) return 0;
const easing = (end-start < MAX*2) ? Math.floor((end-start)/2) : MAX;
const startEase = d3.easePolyOut((time - start)/easing, 3);
const endEase = d3.easePolyOut((end - time)/easing, 3);
const max = d3.easePolyOut(1-(MAX-easing)/MAX, 3);
if (time - start <= easing && end - time <= easing) return Math.min(startEase, endEase) * max;
if (time - start <= easing) return startEase * max;
if (end - time <= easing) return endEase * max;
return max;
}
function heightAtTime(timelineIndex, time) {
const weight = weightAtTime(timelineIndex, time);
const weightAbove = weightAtTimeAboveTimeline(timelineIndex, time);
const coef = 1 - (weightAbove / 20);
const height = Math.round(weight * LINE_HEIGHT * coef);
return height;
}
function yAtTime(timelineIndex, time) {
const indexes = timelineIndexesAtTimeBelowTimeline(timelineIndex, time);
const beforeHeight = indexes.reduce((totalHeight, timelineIndex) => {
return totalHeight + heightAtTime(timelineIndex, time);
}, V_GAP * indexes.length);
return beforeHeight;
}
function timelineIndexesAtTime(time) {
return sortedTimelines.reduce((collector, timeline, index) => {
if (timeline.start <= time && timeline.end >= time) {
collector.push(index);
}
return collector;
}, []);
}
function timelineIndexesAtTimeBelowTimeline(timelineIndex, time) {
const indexes = timelineIndexesAtTime(time);
return indexes.filter(index => index < timelineIndex);
}
function timelineIndexesAtTimeAboveTimeline(timelineIndex, time) {
const indexes = timelineIndexesAtTime(time);
return indexes.filter(index => index > timelineIndex);
}
function weightAtTimeAboveTimeline(timelineIndex, time) {
const indexes = timelineIndexesAtTimeAboveTimeline(timelineIndex, time);
return indexes.reduce(((collector, index) => collector + weightAtTime(index, time)), 0);
}
d3 = require("d3@5");
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