Как я уже сказал в своем комментарии, я рекомендую изучить Canvas
( mdn ).
Вот минимальный пример, который позволяет панорамирование (мышь 1) и масштабирование (мышь 2) в дополнение к обратным вызовам для кликов и движений мыши.
class Chart {
constructor(canvas, hoverCallback, clickCallback) {
this.width = canvas.width;
this.height = canvas.height;
this.ctx = canvas.getContext('2d');
this.ctx.font = '14px serif';
canvas.addEventListener('mousedown', e => {
this.dragged = false;
this.mouseDown = {x: e.offsetX, y: e.offsetY};
});
canvas.addEventListener('mousemove', e => {
hoverCallback?.(this.pixelToCoord(e.offsetX, e.offsetY));
if (!this.mouseDown)
return;
this.dragged = true;
if (e.buttons & 1 && !e.shiftKey)
this.panRange(e.offsetX - this.mouseDown.x, e.offsetY - this.mouseDown.y);
else if (e.buttons & 2 || e.shiftKey)
this.zoomRange(e.offsetX - this.mouseDown.x, e.offsetY - this.mouseDown.y);
this.mouseDown = {x: e.offsetX, y: e.offsetY};
});
canvas.addEventListener('mouseleave', () => hoverCallback?.());
document.addEventListener('mouseup', () => this.mouseDown = null);
canvas.addEventListener('click', e => {
if (this.dragged)
return;
clickCallback?.(this.pixelToCoord(e.offsetX, e.offsetY));
});
canvas.addEventListener('dblclick', e => {
if (this.dragged)
return;
this.resetRange(e.shiftKey);
});
this.pointSets = [];
this.resetRange();
}
set pointSets(value) {
this.pointSets_ = value;
this.draw();
}
resetRange(zeroMins = false) {
let allPoints = this.pointSets_
.flatMap(({points}) => points);
[this.minX, this.deltaX] = Chart.getRange(allPoints.map(({x}) => x), zeroMins);
[this.minY, this.deltaY] = Chart.getRange(allPoints.map(({y}) => y), zeroMins);
this.verifyRange();
this.draw();
}
panRange(x, y) {
this.minX -= x * this.deltaX / this.width;
this.minY += y * this.deltaY / this.height;
this.verifyRange();
this.draw();
}
zoomRange(x, y) {
let dx = x * this.deltaX / this.width;
let dy = -y * this.deltaY / this.height;
this.minX += dx;
this.minY += dy;
this.deltaX -= dx * 2;
this.deltaY -= dy * 2;
this.verifyRange();
this.draw();
}
verifyRange() {
this.minX = Math.max(this.minX, -this.deltaX / 10);
this.minY = Math.max(this.minY, -this.deltaY / 10);
}
draw() {
if (!this.pointSets_ || this.minX === undefined)
return;
this.ctx.fillStyle = 'white';
this.ctx.fillRect(0, 0, this.width, this.height);
this.drawPoints();
this.drawAxis();
}
drawPoints() {
this.pointSets_.forEach(({color, fill, size, points, isPath}) => {
this.ctx.strokeStyle = color;
this.ctx.fillStyle = color;
if (isPath) {
this.ctx.lineWidth = size;
this.ctx.beginPath();
points.forEach((p, i) => {
let {x, y} = this.coordToPixel(p.x, p.y);
if (!i)
this.ctx.moveTo(x, y);
else
this.ctx.lineTo(x, y);
});
if (fill)
this.ctx.fill();
else
this.ctx.stroke();
} else {
points.forEach(p => {
let {x, y} = this.coordToPixel(p.x, p.y);
this.ctx[fill ? 'fillRect' : 'strokeRect'](x - size / 2, y - size / 2, size, size);
});
}
});
}
drawAxis() {
let n = 20;
let step = this.width / n;
let size = 10;
let sizeSmall = 1;
this.ctx.lineWidth = 1;
this.ctx.strokeStyle = `rgb(0, 0, 0)`;
this.ctx.fillStyle = `rgb(0, 0, 0)`;
this.ctx.strokeRect(this.width / n, this.height * (n - 1) / n, this.width * (n - 2) / n, 0); // x axis line
this.ctx.strokeRect(this.width / n, this.height / n, 0, this.width * (n - 2) / n); // y axis line
for (let i = 2; i < n; i += 2) {
let x = i * step;
let y = (n - i) * step;
let xText = Chart.numToPrint(this.minX + i / n * this.deltaX);
let yText = Chart.numToPrint(this.minY + i / n * this.deltaY);
this.ctx.fillText(xText, x - 9, step * (n - 1) + 17); // x axis text
this.ctx.fillText(yText, step - 28, y + 4, 30); // y axis text
this.ctx.fillRect(x - sizeSmall / 2, step * (n - 1) - size / 2, sizeSmall, size); // x axis dots
this.ctx.fillRect(step - size / 2, x - sizeSmall / 2, size, sizeSmall); // y axis dots
}
}
pixelToCoord(x, y) {
return {
x: x / this.width * this.deltaX + this.minX,
y: (1 - y / this.height) * this.deltaY + this.minY,
width: 20 / this.width * this.deltaX,
height: 20 / this.height * this.deltaY
};
}
coordToPixel(x, y) {
return {
x: x === Infinity ? this.width : (x - this.minX) / this.deltaX * this.width,
y: y === Infinity ? 0 : (1 - (y - this.minY) / this.deltaY) * this.height,
};
}
static getRange(values, zeroMin = false, buffer = .1) {
let min = values.length && !zeroMin ? Math.min(...values) : 0;
let max = values.length ? Math.max(...values) : 10;
let delta = max - min + .001;
return [min - delta * buffer, delta + delta * buffer * 2]
}
static numToPrint(n) {
return Math.round(n * 10) / 10;
}
}
let canvas = document.querySelector('canvas');
let chart = new Chart(canvas);
chart.pointSets = [
// e.g. {color: 'rgb(255,0,0)', fill: true, size: 5, points: [{x: 0, y: 1}, ...], isPath: true}
{
color: 'rgb(255,0,0)',
fill: false,
size: 3,
points: [
{x: 0, y: 1},
{x: 1, y: 1},
{x: 1, y: 0},
{x: 0, y: 0},
{x: 0, y: .5},
],
isPath: true,
}, {
color: 'rgb(0,0,255)',
fill: true,
size: 10,
points: [
{x: 0, y: 1},
{x: 0, y: .5},
{x: 3, y: 1},
{x: 6, y: 2},
{x: 7, y: 4},
{x: 6, y: 5},
],
isPath: false,
},
];
chart.resetRange();
canvas {
border: 1px solid;
}
<canvas width="500" height="500"></canvas>