charts/src/js/utils/animate.js

import { getBarHeightAndYAttr, getSplineCurvePointsStr } from './draw-utils';

export const UNIT_ANIM_DUR = 350;
export const PATH_ANIM_DUR = 350;
export const MARKER_LINE_ANIM_DUR = UNIT_ANIM_DUR;
export const REPLACE_ALL_NEW_DUR = 250;

export const STD_EASING = 'easein';

export function translate(unit, oldCoord, newCoord, duration) {
	let old = typeof oldCoord === 'string' ? oldCoord : oldCoord.join(', ');
	return [
		unit,
		{transform: newCoord.join(', ')},
		duration,
		STD_EASING,
		"translate",
		{transform: old}
	];
}

export function translateVertLine(xLine, newX, oldX) {
	return translate(xLine, [oldX, 0], [newX, 0], MARKER_LINE_ANIM_DUR);
}

export function translateHoriLine(yLine, newY, oldY) {
	return translate(yLine, [0, oldY], [0, newY], MARKER_LINE_ANIM_DUR);
}

export function animateRegion(rectGroup, newY1, newY2, oldY2) {
	let newHeight = newY1 - newY2;
	let rect = rectGroup.childNodes[0];
	let width = rect.getAttribute("width");
	let rectAnim = [
		rect,
		{ height: newHeight, 'stroke-dasharray': `${width}, ${newHeight}` },
		MARKER_LINE_ANIM_DUR,
		STD_EASING
	];

	let groupAnim = translate(rectGroup, [0, oldY2], [0, newY2], MARKER_LINE_ANIM_DUR);
	return [rectAnim, groupAnim];
}

export function animateBar(bar, x, yTop, width, offset=0, meta={}) {
	let [height, y] = getBarHeightAndYAttr(yTop, meta.zeroLine);
	y -= offset;
	if(bar.nodeName !== 'rect') {
		let rect = bar.childNodes[0];
		let rectAnim = [
			rect,
			{width: width, height: height},
			UNIT_ANIM_DUR,
			STD_EASING
		];

		let oldCoordStr = bar.getAttribute("transform").split("(")[1].slice(0, -1);
		let groupAnim = translate(bar, oldCoordStr, [x, y], MARKER_LINE_ANIM_DUR);
		return [rectAnim, groupAnim];
	} else {
		return [[bar, {width: width, height: height, x: x, y: y}, UNIT_ANIM_DUR, STD_EASING]];
	}
	// bar.animate({height: args.newHeight, y: yTop}, UNIT_ANIM_DUR, mina.easein);
}

export function animateDot(dot, x, y) {
	if(dot.nodeName !== 'circle') {
		let oldCoordStr = dot.getAttribute("transform").split("(")[1].slice(0, -1);
		let groupAnim = translate(dot, oldCoordStr, [x, y], MARKER_LINE_ANIM_DUR);
		return [groupAnim];
	} else {
		return [[dot, {cx: x, cy: y}, UNIT_ANIM_DUR, STD_EASING]];
	}
	// dot.animate({cy: yTop}, UNIT_ANIM_DUR, mina.easein);
}

export function animatePath(paths, newXList, newYList, zeroLine, spline) {
	let pathComponents = [];
	let pointsStr = newYList.map((y, i) => (newXList[i] + ',' + y)).join("L");

	if (spline)
		pointsStr = getSplineCurvePointsStr(newXList, newYList);

	const animPath = [paths.path, {d:"M" + pointsStr}, PATH_ANIM_DUR, STD_EASING];
	pathComponents.push(animPath);

	if(paths.region) {
		let regStartPt = `${newXList[0]},${zeroLine}L`;
		let regEndPt = `L${newXList.slice(-1)[0]}, ${zeroLine}`;

		const animRegion = [
			paths.region,
			{d:"M" + regStartPt + pointsStr + regEndPt},
			PATH_ANIM_DUR,
			STD_EASING
		];
		pathComponents.push(animRegion);
	}

	return pathComponents;
}

export function animatePathStr(oldPath, pathStr) {
	return [oldPath, {d: pathStr}, UNIT_ANIM_DUR, STD_EASING];
}