227 lines
8.8 KiB
JavaScript
227 lines
8.8 KiB
JavaScript
class ConfluenceChart {
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constructor() {
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this.chart = null;
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this.candles = null;
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this.resizeObserver = null;
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this.levelSeries = new Map();
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this.previewLine = null;
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this.bars = [];
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this.levels = [];
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this.onChartClick = null;
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this.onChartMove = null;
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this.tooltip = null;
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this.chartEl = null;
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this.clickListener = null;
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}
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create(el) {
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this.chartEl = el;
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this.chart = LightweightCharts.createChart(el, {
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autoSize: true,
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layout: {
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background: { color: getComputedStyle(document.documentElement).getPropertyValue('--chart-bg').trim() },
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textColor: getComputedStyle(document.documentElement).getPropertyValue('--muted').trim(),
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},
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grid: {
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vertLines: { color: 'rgba(128,128,128,.10)' },
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horzLines: { color: 'rgba(128,128,128,.10)' },
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},
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timeScale: { timeVisible: true, secondsVisible: false },
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rightPriceScale: { borderVisible: false },
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});
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this.candles = this.chart.addSeries(LightweightCharts.CandlestickSeries, {
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upColor: '#27825c', downColor: '#bd4545', borderVisible: true,
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borderUpColor: '#1d6849', borderDownColor: '#963737',
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wickUpColor: '#1d6849', wickDownColor: '#963737',
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});
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this.resizeObserver = new ResizeObserver(() => {
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this.chart.applyOptions({ width: el.clientWidth, height: el.clientHeight });
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});
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this.resizeObserver.observe(el);
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this.tooltip = document.createElement('div');
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this.tooltip.className = 'chart-tooltip';
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el.appendChild(this.tooltip);
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const preview = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
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preview.classList.add('chart-preview');
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preview.setAttribute('aria-hidden', 'true');
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this.previewLine = document.createElementNS('http://www.w3.org/2000/svg', 'line');
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this.previewLine.setAttribute('hidden', '');
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preview.appendChild(this.previewLine);
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el.appendChild(preview);
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this.clickListener = event => {
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if (!this.onChartClick) return;
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const bounds = el.getBoundingClientRect();
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const point = { x: event.clientX - bounds.left, y: event.clientY - bounds.top };
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const time = this.chart.timeScale().coordinateToTime(point.x);
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if (time != null) this.onChartClick({ point, time });
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};
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el.addEventListener('click', this.clickListener);
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this.chart.subscribeCrosshairMove(param => {
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if (!param.point || !param.time) {
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this.tooltip.hidden = true;
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return;
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}
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this.updateLineTooltip(param);
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if (this.onChartMove) this.onChartMove(param);
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});
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}
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setBars(bars) {
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this.bars = bars;
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this.candles.setData(bars.map(this.toCandle));
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this.chart.timeScale().setVisibleLogicalRange({
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from: Math.max(0, bars.length - 160),
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to: bars.length + 5,
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});
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}
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updateBar(bar) {
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this.candles.update(this.toCandle(bar));
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if (this.bars.length && this.bars[this.bars.length - 1].t === bar.t) this.bars[this.bars.length - 1] = bar;
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else this.bars.push(bar);
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}
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syncLevels(levels) {
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this.levels = levels;
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const wanted = new Set(levels.filter(level => !level.hidden).map(level => level.id));
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for (const [id, entry] of this.levelSeries) {
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if (!wanted.has(id)) {
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this.chart.removeSeries(entry.series);
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this.levelSeries.delete(id);
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}
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}
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for (const level of levels) {
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if (level.hidden) continue;
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let entry = this.levelSeries.get(level.id);
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const isMa = level.kind === 'ma';
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const options = {
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color: level.color || ConfluenceChart.tfColors[level.tf],
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lineWidth: level.line_width || (level.tf === '1d' ? 2 : 1),
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lineType: isMa ? LightweightCharts.LineType.WithSteps : LightweightCharts.LineType.Simple,
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lineStyle: level.provisional ? LightweightCharts.LineStyle.Dashed : LightweightCharts.LineStyle.Solid,
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priceLineVisible: false,
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lastValueVisible: true,
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title: level.label,
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// Overlays outside the visible price range must not flatten the candles.
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autoscaleInfoProvider: () => null,
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};
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if (!entry) {
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entry = { series: this.chart.addSeries(LightweightCharts.LineSeries, options) };
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this.levelSeries.set(level.id, entry);
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} else {
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entry.series.applyOptions(options);
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}
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let data;
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if (isMa) {
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data = (level.points || []).map(([time, value]) => ({ time, value }));
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} else {
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data = this.lineData(level);
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}
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entry.series.setData(data);
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}
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}
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setClickHandler(handler) { this.onChartClick = handler; }
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setMoveHandler(handler) { this.onChartMove = handler; }
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setLinePreview(start, end, color, lineWidth) {
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if (start.t === end.t) return;
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const x1 = this.chart.timeScale().timeToCoordinate(start.t);
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const x2 = this.chart.timeScale().timeToCoordinate(end.t);
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const y1 = this.candles.priceToCoordinate(start.p);
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const y2 = this.candles.priceToCoordinate(end.p);
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if ([x1, x2, y1, y2].some(value => value == null)) return;
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this.previewLine.removeAttribute('hidden');
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this.previewLine.setAttribute('x1', x1);
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this.previewLine.setAttribute('y1', y1);
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this.previewLine.setAttribute('x2', x2);
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this.previewLine.setAttribute('y2', y2);
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this.previewLine.setAttribute('stroke', color);
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this.previewLine.setAttribute('stroke-width', lineWidth);
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this.previewLine.setAttribute('stroke-dasharray', '6 4');
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}
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clearLinePreview() {
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if (this.previewLine) this.previewLine.setAttribute('hidden', '');
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}
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updateLineTooltip(param) {
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const id = this.hitTest(param);
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const line = this.levels.find(level => level.id === id);
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this.tooltip.hidden = !line;
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if (!line) return;
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this.tooltip.textContent = `#${line.number} ${line.label}`;
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this.tooltip.style.left = `${param.point.x + 12}px`;
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this.tooltip.style.top = `${Math.max(8, param.point.y - 30)}px`;
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}
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pointFromClick(param, snap) {
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const rawPrice = this.candles.coordinateToPrice(param.point.y);
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let point = { t: Number(param.time), p: rawPrice, snappedSide: null };
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if (!snap || !this.bars.length) return point;
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const nearest = this.bars.reduce((best, bar) => Math.abs(bar.t - point.t) < Math.abs(best.t - point.t) ? bar : best);
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const candidates = [
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{ p: nearest.h, side: 'resistance' },
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{ p: nearest.l, side: 'support' },
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];
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const snapped = candidates
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.map(value => ({ ...value, distance: Math.abs(this.candles.priceToCoordinate(value.p) - param.point.y) }))
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.sort((a, b) => a.distance - b.distance)[0];
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if (snapped.distance <= 8) point = { t: nearest.t, p: snapped.p, snappedSide: snapped.side };
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return point;
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}
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hitTest(param) {
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let best = null;
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for (const level of this.levels.filter(value => value.kind === 'manual')) {
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const points = this.lineData(level).map(point => ({
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x: this.chart.timeScale().timeToCoordinate(point.time),
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y: this.candles.priceToCoordinate(point.value),
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}));
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for (let index = 1; index < points.length; index += 1) {
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const [start, end] = [points[index - 1], points[index]];
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if ([start.x, start.y, end.x, end.y].some(value => value == null) || start.x === end.x) continue;
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if (param.point.x < Math.min(start.x, end.x) - 6 || param.point.x > Math.max(start.x, end.x) + 6) continue;
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const lineY = start.y + (end.y - start.y) * (param.point.x - start.x) / (end.x - start.x);
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const distance = Math.abs(lineY - param.point.y);
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if (distance <= 6 && (!best || distance < best.distance)) best = { id: level.id, distance };
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}
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}
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return best?.id || null;
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}
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lineData(level) {
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const secondPrice = level.anchor_p + level.slope * (level.last_t - level.anchor_t);
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const points = [
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{ time: level.anchor_t, value: level.anchor_p },
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{ time: level.last_t, value: secondPrice },
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];
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const anchorIndex = this.bars.findIndex(bar => bar.t >= level.anchor_t);
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const secondIndex = this.bars.findIndex(bar => bar.t >= level.last_t);
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const lastIndex = this.bars.length - 1;
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if (anchorIndex >= 0 && secondIndex > anchorIndex && lastIndex > secondIndex) {
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const value = level.anchor_p
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+ (secondPrice - level.anchor_p) * (lastIndex - anchorIndex) / (secondIndex - anchorIndex);
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points.push({ time: this.bars[lastIndex].t, value });
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}
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return points.filter((point, index) => index === 0 || point.time !== points[index - 1].time);
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}
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toCandle(bar) {
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return { time: bar.t, open: bar.o, high: bar.h, low: bar.l, close: bar.c };
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}
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destroy() {
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if (this.resizeObserver) this.resizeObserver.disconnect();
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if (this.chartEl && this.clickListener) this.chartEl.removeEventListener('click', this.clickListener);
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if (this.chart) this.chart.remove();
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}
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}
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ConfluenceChart.tfColors = {
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'1m':'#82909f', '2m':'#8a92df', '5m':'#65b7cf', '15m':'#45c39b',
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'30m':'#a8c85d', '1h':'#efb643', '4h':'#ec7b42', '1d':'#d96073',
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};
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window.ConfluenceChart = ConfluenceChart;
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