fix(axis): Fix x axis extent to work

Make axis.x.extent option to limit dragging area
for zoom drag

Ref #3768

src/ChartInternal/Axis/Axis.ts

@@ -106,6 +106,29 @@ class Axis {
 		return type;
 	}
 
+	/**
+	 * Get extent value
+	 * @returns {Array} default extent
+	 * @private
+	 */
+	public getExtent(): number[] {
+		const $$ = this.owner;
+		const {config, scale} = $$;
+		let extent = config.axis_x_extent;
+
+		if (extent) {
+			if (isFunction(extent)) {
+				extent = extent.bind($$.api)($$.getXDomain($$.data.targets), scale.subX);
+			} else if (this.isTimeSeries() && extent.every(isNaN)) {
+				const fn = parseDate.bind($$);
+
+				extent = extent.map(v => scale.subX(fn(v)));
+			}
+		}
+
+		return extent;
+	}
+
 	init() {
 		const $$ = this.owner;
 		const {config, $el: {main, axis}, state: {clip}} = $$;

src/ChartInternal/interactions/subchart.ts

@@ -5,7 +5,7 @@
 import {brushSelection as d3BrushSelection, brushX as d3BrushX, brushY as d3BrushY} from "d3-brush";
 import {select as d3Select} from "d3-selection";
 import CLASS from "../../config/classes";
-import {brushEmpty, capitalize, isArray, isFunction, parseDate} from "../../module/util";
+import {brushEmpty, capitalize, isArray} from "../../module/util";
 
 export default {
 	/**
@@ -92,7 +92,7 @@ export default {
 		// set the brush extent
 		$$.brush.scale = function(scale) {
 			const h = config.subchart_size_height;
-			let extent = $$.getExtent();
+			let extent = $$.axis.getExtent();
 
 			if (!extent && scale.range) {
 				extent = [[0, 0], [scale.range()[1], h]];
@@ -373,28 +373,5 @@ export default {
 
 		subchart.main.attr("transform", $$.getTranslate("context"));
 		subXAxis.attr("transform", $$.getTranslate("subX"));
-	},
-
-	/**
-	 * Get extent value
-	 * @returns {Array} default extent
-	 * @private
-	 */
-	getExtent(): number[] {
-		const $$ = this;
-		const {config, scale} = $$;
-		let extent = config.axis_x_extent;
-
-		if (extent) {
-			if (isFunction(extent)) {
-				extent = extent.bind($$.api)($$.getXDomain($$.data.targets), scale.subX);
-			} else if ($$.axis.isTimeSeries() && extent.every(isNaN)) {
-				const fn = parseDate.bind($$);
-
-				extent = extent.map(v => scale.subX(fn(v)));
-			}
-		}
-
-		return extent;
 	}
 };

src/ChartInternal/interactions/zoom.ts

@@ -367,6 +367,7 @@ export default {
 		let start = 0;
 		let end = 0;
 		let zoomRect;
+		let extent;
 
 		const prop = {
 			axis: isRotated ? "y" : "x",
@@ -377,6 +378,9 @@ export default {
 		$$.zoomBehaviour = d3Drag()
 			.clickDistance(4)
 			.on("start", function(event) {
+				// get extent at first zooming, when is zoomed do not consider
+				extent = $$.scale.zoom ? null : $$.axis.getExtent();
+
 				state.event = event;
 				$$.setDragStatus(true);
 				$$.unselectRect();
@@ -390,6 +394,15 @@ export default {
 				}
 
 				start = getPointer(event, this as SVGAElement)[prop.index];
+
+				if (extent) {
+					if (start < extent[0]) {
+						start = extent[0];
+					} else if (start > extent[1]) {
+						start = extent[1];
+					}
+				}
+
 				end = start;
 
 				zoomRect
@@ -401,6 +414,14 @@ export default {
 			.on("drag", function(event) {
 				end = getPointer(event, this as SVGAElement)[prop.index];
 
+				if (extent) {
+					if (end > extent[1]) {
+						end = extent[1];
+					} else if (end < extent[0]) {
+						end = extent[0];
+					}
+				}
+
 				zoomRect
 					.attr(prop.axis, Math.min(start, end))
 					.attr(prop.attr, Math.abs(end - start));

src/config/Options/axis/x.ts

@@ -635,7 +635,8 @@ export default {
 	axis_x_height: <number | undefined>undefined,
 
 	/**
-	 * Set default extent for subchart and zoom. This can be an array or function that returns an array.
+	 * Set extent for subchart and zoom(drag only). This can be an array or function that returns an array.
+	 * - **NOTE:** Specifying value, will limit the zoom scope selection within.
 	 * @name axis․x․extent
 	 * @memberof Options
 	 * @type {Array|Function}

test/interactions/drag-spec.ts

@@ -7,6 +7,7 @@
 import {beforeEach, beforeAll, afterEach, describe, expect, it} from "vitest";
 import {$DRAG, $SELECT} from "../../src/config/classes";
 import util from "../assets/util";
+import { transition } from "d3-transition";
 
 describe("DRAG", function() {
 	let chart;
@@ -170,4 +171,101 @@ describe("DRAG", function() {
 			}, 300);
 		}));
 	});
+
+	describe("axis.x.extent", () => {
+		beforeAll(() => {
+			args = {
+				data: {
+					x: "x",
+					json: {
+					  Temperature: [
+						"23.43",
+						"23.16",
+						"27.48",
+						"26.78",
+						"26.62",
+						"26.64",
+						"26.29",
+						"26.01",
+						"25.84",
+						"25.07",
+						"24.85",
+						"24.01",
+					  ],
+					  x: [
+						"2018-01-01",
+						"2018-02-01",
+						"2018-03-01",
+						"2018-04-01",
+						"2018-05-01",
+						"2018-06-01",
+						"2018-07-01",
+						"2018-08-01",
+						"2018-09-01",
+						"2018-10-01",
+						"2018-11-01",
+						"2018-12-01",
+					  ],
+					},
+					type: "area",
+				},
+				axis: {
+					x: {
+						tick: {
+							fit: false,
+							count: 5
+						},
+						type: "timeseries",
+						extent: ["2018-04-01", "2018-07-01"],
+					}
+				},
+				zoom: {
+					enabled: true,
+					type: "drag"
+				},
+				transition: {
+					duration: 0
+				}
+			};
+		});
+
+		it("drag zoom can't surpass the extent", () => new Promise(done => {
+			const {internal: {$el, scale}} = chart;
+
+			util.doDrag($el.eventRect.node(), {
+				clientX: 50,
+				clientY: 50
+			}, {
+				clientX: 550,
+				clientY: 50,
+			});
+
+			setTimeout(() => {
+				const zoomed = chart.zoom().map(v => Number(v).toString());
+
+				expect(/^15225.*/.test(zoomed[0])).to.be.true;
+				expect(/^1530.*/.test(zoomed[1])).to.be.true;
+
+				done(1);
+			}, 300);
+		}));
+
+		it("set options: subchart.show=true", () => {
+			args.subchart = {
+				show: true
+			};
+
+			args.zoom.enabled = false;
+		});
+
+		it("subchart selection width should match with extent", () => {
+			const {internal: {brush, scale}} = chart;
+			const overlay = brush.getSelection().select(".overlay");
+			const start = scale.x(new Date(`${args.axis.x.extent[0]} 00:00:00`));
+			const end = scale.x(new Date(`${args.axis.x.extent[1]} 00:00:00`));
+
+			expect(+overlay.attr("x")).to.be.equal(start);
+			expect(+overlay.attr("x") + +overlay.attr("width")).to.be.equal(end);
+		});
+	});
 });

types/axis.d.ts

@@ -121,8 +121,8 @@ export interface xAxisConfiguration extends AxisConfigurationBase {
 	height?: number;
 
 	/**
-	 * Set default extent for subchart and zoom.
-	 * This can be an array or function that returns an array.
+	 * Set extent for subchart and zoom(drag only). This can be an array or function that returns an array.
+	 * - **NOTE:** Specifying value, will limit the zoom scope selection within.
 	 */
 	extent?: Array<number|string> | (
 		(