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import { TType } from './parser/values';
import { TransitionType } from './SSVGTransition';
import 'd3-transition'; // needed at least once to load plugins
import { scaleLinear } from 'd3-scale';
import { interpolateNumber } from 'd3-interpolate';
import { bisect } from 'd3-array';
import { AttributeType, CalcMode, default as SSVGRelationElement } from './SSVGRelationElement';
import SSVGFilter from './SSVGFilter';
/**
* @typedef {import('./SSVGState').default} SSVGState
* @typedef {import('./SSVGProperty').default} SSVGProperty
*/
/**
* @template T=any
* @param {number[]} keyTimes
* @param {T[]} values
* @return {(t: number) => T}
*/
export function scaleThreshold(keyTimes, values) {
return function(t) {
return values[bisect(keyTimes, t, 1, keyTimes.length) - 1];
};
}
export default class SSVGRelation extends SSVGRelationElement {
/**
*
* @param {SSVGState} ssvg
* @param {Element} element
*/
constructor(ssvg, element) {
super(ssvg, element);
this.id = ++SSVGRelation.id;
/** @type {(t: number) => ssvg.$Value} */
this.scale; /* eslint-disable-line no-unused-expressions *//* jshint ignore:line */
/** @type {number[]|null} */
this.keyTimes; /* eslint-disable-line no-unused-expressions *//* jshint ignore:line */
/** @type {undefined|null|((prop: SSVGProperty, t?: number) => number)} */
this.quantize; /* eslint-disable-line no-unused-expressions *//* jshint ignore:line */
/** @type {ssvg.$Value} */
this._last; /* eslint-disable-line no-unused-expressions *//* jshint ignore:line */
this._filter = new SSVGFilter(element);
this.init();
}
init() {
this.animName = 'ssvg-rel-' + this.id;
this.canInterpolate = TType[this.values.type].canInterpolate;
Eif (!this.keyTimes) {
this.keyTimes =
this.values.values.map((val, idx) => idx / (this.values.values.length - 1));
}
if (!this.canInterpolate) {
this.scale = scaleThreshold(
this.keyTimes,
this.values.values);
}
else {
this.scale = scaleLinear(this.keyTimes, this.values.values);
if (this.calcMode === CalcMode.discrete) {
const toScale = scaleThreshold(this.keyTimes, this.keyTimes);
this.quantize = (prop, t) => toScale(prop.normalize(t));
}
}
}
disconnect() {
this.selection.interrupt(this.animName);
}
/**
* @param {SSVGProperty} prop
*/
setInitial(prop) {
this.selection.interrupt(this.animName);
const to = this.quantize ? this.quantize(prop) : prop.normalize();
const value = (this.transition.type === TransitionType.direct) ?
this.direct(this.scale(to)) : this.strict(to);
if (!this.attributeName) {
this.selection.text(value);
}
else if (this.attributeType === AttributeType.CSS) {
this.selection.style(this.attributeName, value);
}
else {
this.selection.attr(this.attributeName, value);
}
}
/**
* @param {SSVGProperty} prop
*/
update(prop) {
this.selection.interrupt(this.animName);
const to = (this.quantize) ? this.quantize(prop) : prop.normalize();
var t = this.selection.transition(this.animName);
Iif (this.transition.delay) {
t = t.delay(this.transition.delay);
}
t = t.ease(this.transition.timingFunction);
t = t.duration(this.transition.duration);
/** @type {(t: number) => any} */
var factory;
if (this.transition.type === TransitionType.direct) {
const scaledTo = this.scale(to);
// non-interpolatable direct transitions change value at half animation
// duration
const interpolator = (this.canInterpolate) ?
scaleLinear([ 0, 1 ], [ this._last, scaledTo ]) :
(/** @type {number} */t) => ((t >= 0.5) ? scaledTo : this._last);
factory = (t) => this.direct(interpolator(t));
}
else {
// @ts-ignore
const interpolator = interpolateNumber(this._last, to);
factory = (t) => this.strict(interpolator(t));
}
if (!this.attributeName) {
t.textTween(() => factory);
}
else if (this.attributeType === AttributeType.CSS) {
t.styleTween(this.attributeName, () => factory);
}
else {
t.attrTween(this.attributeName, () => factory);
}
}
/**
* @brief computed target value from normalized input
* @param {number} n
*/
strict(n) {
this._last = n;
const value = this.scale(n);
return this._filter.filter(value, this.values.unit);
}
/**
* @brief pre-computed target value
* @param {ssvg.$Value} value
*/
direct(value) {
this._last = value;
return this._filter.filter(value, this.values.unit);
}
}
SSVGRelation.id = 0;
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