Function updateCursor

src/uPlot.js:2686–3070

(src, _fire, _pub)

	}

	function updateCursor(src, _fire, _pub) {
	//	ts == null && log("updateCursor()", arguments);

		rawMouseLeft1 = mouseLeft1;
		rawMouseTop1 = mouseTop1;

		[mouseLeft1, mouseTop1] = cursor.move(self, mouseLeft1, mouseTop1);

		cursor.left = mouseLeft1;
		cursor.top = mouseTop1;

		if (showCursor) {
			vCursor && elTrans(vCursor, round(mouseLeft1), 0, plotWidCss, plotHgtCss);
			hCursor && elTrans(hCursor, 0, round(mouseTop1), plotWidCss, plotHgtCss);
		}

		let idx;

		// when zooming to an x scale range between datapoints the binary search
		// for nearest min/max indices results in this condition. cheap hack :D
		let noDataInRange = i0 > i1; // works for mode 1 only

		closestDist = inf;
		closestSeries = null;

		// TODO: extract
		let xDim = scaleX.ori == 0 ? plotWidCss : plotHgtCss;
		let yDim = scaleX.ori == 1 ? plotWidCss : plotHgtCss;

		// if cursor hidden, hide points & clear legend vals
		if (mouseLeft1 < 0 || dataLen == 0 || noDataInRange) {
			idx = cursor.idx = null;

			for (let i = 0; i < series.length; i++) {
				let pt = cursorPts[i];
				pt != null && elTrans(pt, -10, -10, plotWidCss, plotHgtCss);
			}

			if (cursorFocus)
				setSeries(null, FOCUS_TRUE, true, src == null && syncOpts.setSeries);

			if (FEAT_LEGEND && legend.live) {
				activeIdxs.fill(idx);
				shouldSetLegend = true;
			}
		}
		else {
		//	let pctY = 1 - (y / rect.height);

			let mouseXPos, valAtPosX, xPos;

			if (mode == 1) {
				mouseXPos = scaleX.ori == 0 ? mouseLeft1 : mouseTop1;
				valAtPosX = posToVal(mouseXPos, xScaleKey);
				idx = cursor.idx = closestIdx(valAtPosX, data[0], i0, i1);
				xPos = valToPosX(data[0][idx], scaleX, xDim, 0);
			}