uPlot/demos/zoom-wheel.html at 08faf7156290823d3cac2cbcedf8cc40475b4db6 · leeoniya/uPlot · GitHub

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<!doctype html>
<html>
	<head>
		<meta charset="utf-8">
		<title>Wheel Zoom &amp; Drag</title>
		<meta name="viewport" content="width=device-width, initial-scale=1">

		<link rel="stylesheet" href="../dist/uPlot.min.css">
	</head>
	<body>
		<script src="../dist/uPlot.iife.js"></script>
		<script>
			function wheelZoomPlugin(opts) {
				let factor = opts.factor || 0.75;

				let xMin, xMax, yMin, yMax, xRange, yRange;

				function clamp(nRange, nMin, nMax, fRange, fMin, fMax) {
					if (nRange > fRange) {
						nMin = fMin;
						nMax = fMax;
					}
					else if (nMin < fMin) {
						nMin = fMin;
						nMax = fMin + nRange;
					}
					else if (nMax > fMax) {
						nMax = fMax;
						nMin = fMax - nRange;
					}

					return [nMin, nMax];
				}

				return {
					hooks: {
						ready: u => {
							xMin = u.scales.x.min;
							xMax = u.scales.x.max;
							yMin = u.scales.y.min;
							yMax = u.scales.y.max;

							xRange = xMax - xMin;
							yRange = yMax - yMin;

							let over = u.over;
							let rect = over.getBoundingClientRect();

							// all axes add event
							for(let key in u.axes){
								let axis = u.axes[key]._el;

								let a_rect = axis.getBoundingClientRect();

								axis._params = [key, a_rect];

								axis.addEventListener("mousedown", e => {
									// wheel drag pan
									if (e.button == 1) {
										e.preventDefault();

										let key = e.target._params[0];
										// sacle ID
										let scale_key = u.axes[key].scale;

										let scale = u.scales[scale_key]
										let umin = scale.min;
										let umax = scale.max;

										let scale_scale = u.posToVal(0, scale_key) - u.posToVal(1, scale_key);

										let left0 = e.clientX;
										let top0 = e.clientY;

										function onmove(e) {
											e.preventDefault();

											let left1 = e.clientX;
											let top1 = e.clientY;
											let dt = 0;
											if(scale.ori === 0){ // x sacle
												let dx = (left1 - left0);
												dt = dx;
											}else if(scale.ori === 1){
												let dy = top1 - top0;
												dt = dy;
											}else{return;}

											let urange = []
											for(let key in u.scales){
												urange[key] = [u.scales[key].min, u.scales[key].max];
											}

											u.setScale(scale_key, {
												min: umin + dt*scale_scale,
												max: umax + dt*scale_scale,
											});
											// restore other scale
											for(let key in urange){
												if(key !== scale_key){
													u.setScale(key, {
														min: urange[key][0],
														max: urange[key][1],
													});
												}
											}

										}

										function onup(e) {
											document.removeEventListener("mousemove", onmove);
											document.removeEventListener("mouseup", onup);
										}
										document.addEventListener("mousemove", onmove);
										document.addEventListener("mouseup", onup);
									}
								});

								// wheel scroll zoom
								axis.addEventListener("wheel", e=>{
									e.preventDefault();

									let key = e.target._params[0];
									let scale_key = u.axes[key].scale;

									let range = u.scales[scale_key].max - u.scales[scale_key].min;
									let val  = (u.scales[scale_key].max + u.scales[scale_key].min)/2;

									range = e.deltaY < 0 ? range *factor: range / factor;

									let nMin = val -range/2;
									let nMax = val +range/2;

									let urange = []
									for(let key in u.scales){
										urange[key] = [u.scales[key].min, u.scales[key].max];
									}

									u.batch(() => {
										u.setScale(scale_key, {
											min: nMin,
											max: nMax,
										});
									});

									for(let key in urange){
										if(key !== scale_key){
											u.setScale(key, {
												min: urange[key][0],
												max: urange[key][1],
											});
										}
									}
								});

							}


							// wheel drag pan on scale axes
							over.addEventListener("mousedown", e => {
								if (e.button == 1) {
									e.preventDefault();
									// 记录起始位置
									let left0 = e.clientX;
									let top0 = e.clientY;
									let scY = new Array()
									for(var key in u.scales){
										scY[key] = [u.scales[key].min, u.scales[key].max, u.posToVal(1, key) - u.posToVal(0, key), u.scales[key].ori];
									}
									function onmove(e) {
										e.preventDefault();

										let left1 = e.clientX;
										let top1 = e.clientY;

										let dx = (left1 - left0);
										let dy = top1 - top0;

										for(var key in u.scales){
											if(scY[key] !== null){
												let dt = 0;
												if(scY[key][3] === 0){
													// x轴
													dt = dx;
												}
												else if(scY[key][3] === 1){
													// y 轴
													dt = dy;
												}else{
													continue;
												}
												u.setScale(key, {
													min: scY[key][0] - dt*scY[key][2],
													max: scY[key][1] - dt*scY[key][2],
												});
											}

										}
									}

									function onup(e) {
										document.removeEventListener("mousemove", onmove);
										document.removeEventListener("mouseup", onup);
									}
									document.addEventListener("mousemove", onmove);
									document.addEventListener("mouseup", onup);
								}
							});

							//wheel scroll zoom
							over.addEventListener("wheel", e => {
								e.preventDefault();

								let {left, top} = u.cursor;

								let leftPct = left/rect.width;
								let btmPct = 1 - top/rect.height;

								let oRange = new Array();
								for(var key in u.scales){
									let Val = 0;
									// ??
									if(u.scales[key].ori == 0){
										Val = u.posToVal(left,key);
									}else if(u.scales[key].ori == 1){
										Val = u.posToVal(top, key)
									}else{ continue;}

									let range = u.scales[key].max - u.scales[key].min;
									let nRange = e.deltaY < 0 ? range * factor : range / factor;

									let nMin = Val - leftPct * nRange;
									let nMax = nMin + nRange;
									oRange[key] = [nMin, nMax];
								}
								u.batch(() => {
									for(var key in oRange){
										u.setScale(key, {
											min: oRange[key][0],
											max: oRange[key][1],
										});
									}
								});
							});
						}
					}
				};
			}

			function makeChart() {
				console.time('chart');

				let opts = {
					title: "Wheel Zoom & Drag",
					width: 600,
					height: 400,
					plugins: [
						wheelZoomPlugin({factor: 0.75})
					],
					scales: {
						x: {
							time: false,
						},
					//	y: {
					//		auto: false,
					//	}
					},
					series: [
						{},
						{
							label: "One",
							stroke: "red",
						},
						{
							label: "Two",
							stroke: "blue",
						},
					]
				};

				const data = [
					[ 1, 2, 3, 4, 5, 6, 7],
					[40,43,60,65,71,73,80],
					[18,24,37,55,55,60,63],
				];

				let u = new uPlot(opts, data, document.body);

				console.timeEnd('chart');
			}

			makeChart();
		</script>
	</body>
</html>