in src/core/configurableTL.ts [761:956]
function updateScale(scale, representation) {
if (scale === "Chronological") {
if (representation === "Radial") {
// valid scale
// initialize the time scale
timeline_scale = d3.time.scale()
.range([0, 2 * Math.PI]);
const endYear = data.max_end_date.getUTCFullYear();
const startYear = data.min_start_date.getUTCFullYear();
function yearBasedScale(years_per_segment) {
const start = Math.floor(startYear / years_per_segment) * years_per_segment;
const end = (Math.ceil((endYear + 1) / years_per_segment) + 1) * years_per_segment;
timeline_scale_segments = time.year.range(moment([start, 0, 1]).toDate(), moment([end, 0, 1]).toDate(), years_per_segment);
timeline_scale.domain([moment([start, 0, 1]).toDate(), moment([(end + years_per_segment), 0, 1]).toDate()]);
}
switch (globals.segment_granularity) {
case "days":
if (time.hour.count(time.day.floor(data.min_start_date), time.day.ceil(data.max_end_date)) > 24) {
timeline_scale_segments = time.hour.range(time.day.floor(data.min_start_date), time.hour.offset(time.day.ceil(data.max_end_date), 3), 12);
} else {
timeline_scale_segments = time.hour.range(time.day.floor(data.min_start_date), time.hour.offset(time.day.ceil(data.max_end_date), 3), 3);
}
timeline_scale.domain([time.day.floor(data.min_start_date), time.day.ceil(data.max_end_date)]);
break;
case "weeks":
timeline_scale_segments = time.week.range(time.week.floor(data.min_start_date), time.week.offset(data.max_end_date, 1), 2);
timeline_scale.domain([time.week.floor(data.min_start_date), time.week.offset(data.max_end_date, 1)]);
break;
case "months":
timeline_scale_segments = time.month.range(time.month.floor(data.min_start_date), time.month.offset(data.max_end_date, 1));
timeline_scale.domain([time.month.floor(data.min_start_date), time.month.offset(data.max_end_date, 1)]);
break;
case "years":
timeline_scale_segments = time.year.range(time.year.floor(data.min_start_date), time.year.offset(data.max_end_date, 1));
timeline_scale.domain([time.year.floor(data.min_start_date), time.year.offset(data.max_end_date, 1)]);
break;
case "decades":
yearBasedScale(endYear - startYear >= 50 ? 10 : 5);
break;
case "centuries":
yearBasedScale(endYear - startYear >= 500 ? 100 : 20);
break;
case "millenia":
yearBasedScale(endYear - startYear >= 5000 ? 1000 : 200);
break;
case "epochs":
timeline_scale_segments = [data.min_start_date.valueOf(), data.min_start_date.valueOf() * 0.25, data.min_start_date.valueOf() * 0.5, data.min_start_date.valueOf() * 0.75];
timeline_scale.domain([data.min_start_date, data.max_end_date]);
break;
default:
break;
}
//logEvent(scale + " scale updated with " + globals.date_granularity + " date granularity and range: " + data.min_start_date + " - " + data.max_end_date, "scale_update");
} else {
// valid scale
if (globals.date_granularity === "epochs") { // eslint-disable-line no-lonely-if
timeline_scale = d3.scale.linear()
.range([0, width - unit_width])
.domain([data.min_start_date.valueOf(), data.max_end_date.valueOf()]);
tick_format = format;
} else {
timeline_scale = d3.time.scale()
.range([0, width - unit_width])
.domain([data.min_start_date, data.max_end_date]);
if (globals.date_granularity === "years" && data.min_start_date.getUTCFullYear() <= 100) {
tick_format = function (d) {
if (d.getUTCFullYear() > 0) {
return +d.getUTCFullYear() + " AD";
} else if (d.getUTCFullYear() < 0) {
return (-1 * d.getUTCFullYear()) + " BC";
} else if (d.getUTCFullYear() === 0) {
return 0;
}
};
}
}
}
//logEvent(scale + " scale updated with " + globals.date_granularity + " date granularity and range: " + data.min_start_date + " - " + data.max_end_date, "scale_update");
} else if (scale === "Log") {
timeline_scale = d3.scale.log()
.range([0, width - unit_width]);
log_bounds = -1 * Math.abs(data.max_end_date.valueOf() - data.min_start_date.valueOf()) - 1;
timeline_scale.domain([log_bounds, -1]);
switch (globals.segment_granularity) {
case "days":
log_bounds = -1 * time.hour.count(data.min_start_date, data.max_end_date) - 1;
tick_format = function (d) {
return d + " hours";
};
break;
case "weeks":
log_bounds = -1 * time.day.count(data.min_start_date, data.max_end_date) - 1;
tick_format = function (d) {
return d + " days";
};
break;
case "months":
log_bounds = -1 * time.week.count(data.min_start_date, data.max_end_date) - 1;
tick_format = function (d) {
return d + " weeks";
};
break;
case "years":
log_bounds = -1 * time.month.count(data.min_start_date, data.max_end_date) - 1;
tick_format = function (d) {
return d + " months";
};
break;
case "decades":
case "centuries":
case "millenia":
log_bounds = -1 * Math.abs(data.max_end_date.getUTCFullYear() - data.min_start_date.getUTCFullYear()) - 1;
tick_format = function (d) {
return d + " years";
};
break;
default:
log_bounds = -1 * Math.abs(data.max_end_date.valueOf() - data.min_start_date.valueOf()) - 1;
tick_format = format;
break;
}
timeline_scale.domain([log_bounds, -1]);
//logEvent(scale + " scale updated with " + globals.segment_granularity + " granularity and range: " + data.min_start_date + " - " + data.max_end_date, "scale_update");
} else if (scale === "Collapsed" || scale === "Sequential") {
if (scale === "Sequential" && representation === "Radial") {
// valid scale
var index_offset = 5;
if (globals.max_seq_index > 500) {
index_offset = 100;
} else if (globals.max_seq_index > 100) {
index_offset = 50;
} else if (globals.max_seq_index > 50) {
index_offset = 10;
} else if (globals.max_seq_index > 10) {
index_offset = 5;
} else {
index_offset = 1;
}
timeline_scale = d3.scale.linear()
.range([0, 2 * Math.PI])
.domain([0, (Math.ceil(globals.max_seq_index / index_offset) + 1) * index_offset]);
timeline_scale_segments = d3.range(0, (Math.ceil(globals.max_seq_index / index_offset) + 1) * index_offset, index_offset);
//logEvent(tl_scale + " scale updated with range: 0 - " + globals.max_seq_index, "scale_update");
} else {
timeline_scale = d3.scale.linear()
.range([0, globals.max_seq_index * 1.5 * unit_width - unit_width])
.domain([0, globals.max_seq_index * unit_width]);
if (scale === "Collapsed") {
let i = -1, last_start_date;
// valid Collapsed scale
data.forEach(function (item) {
i++;
if (i === 0) {
item.time_elapsed = 0;
last_start_date = item.start_date;
} else if ((item.start_date.valueOf() - last_start_date.valueOf()) > 0) {
item.time_elapsed = item.start_date.valueOf() - last_start_date.valueOf();
if (globals.date_granularity === "epochs") {
item.time_elapsed_label = format(item.start_date.valueOf() - last_start_date.valueOf()) + " years";
} else {
item.time_elapsed_label = moment(item.start_date).from(moment(last_start_date), true);
}
last_start_date = item.start_date;
} else {
item.time_elapsed = 0;
if (globals.date_granularity === "epochs") {
item.time_elapsed_label = format(item.start_date.valueOf() - last_start_date.valueOf()) + " years";
} else {
item.time_elapsed_label = moment(item.start_date).from(moment(last_start_date), true);
}
}
});
var max_time_elapsed = d3.max(data, function (d) { return d.time_elapsed; });
// initialize the time scale
if (globals.date_granularity === "epochs") {
interim_duration_scale = d3.scale.log().range([0.25 * unit_width, 4 * unit_width])
.domain([1, max_time_elapsed]);
} else {
interim_duration_scale = d3.scale.linear().range([0.25 * unit_width, 4 * unit_width])
.domain([0, max_time_elapsed]);
}
}
//logEvent(scale + " scale updated with range: 0 - " + globals.max_seq_index, "scale_update");
}
}
}