786 lines
35 KiB
JavaScript
786 lines
35 KiB
JavaScript
/**
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* Drawing Tools for Lightweight Charts
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* Implements professional trading chart drawing primitives
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*/
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export class DrawingManager {
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constructor(dashboard, container) {
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this.dashboard = dashboard;
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this.chart = dashboard.chart;
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this.series = dashboard.candleSeries;
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this.container = container;
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this.drawings = [];
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this.activeTool = null;
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this.currentDrawing = null;
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this.selectedDrawing = null;
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this.dragMode = null;
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this.isMouseDown = false;
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// Dragging offsets
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this.dragStartPos = null;
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this.startP1 = null;
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this.startP2 = null;
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this.startPrice = null;
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this.startTime = null;
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this.init();
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}
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init() {
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const container = this.container;
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// Mouse Events
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container.addEventListener('mousedown', (e) => this.handleMouseDown(e));
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window.addEventListener('mousemove', (e) => this.handleMouseMove(e));
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window.addEventListener('mouseup', (e) => this.handleMouseUp(e));
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// Touch Events
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container.addEventListener('touchstart', (e) => {
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if (this.activeTool || this.selectedDrawing) e.preventDefault();
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this.handleMouseDown(this.touchToMouseEvent(e));
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}, { passive: false });
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window.addEventListener('touchmove', (e) => {
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if (this.activeTool || (this.selectedDrawing && this.isMouseDown)) e.preventDefault();
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this.handleMouseMove(this.touchToMouseEvent(e));
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}, { passive: false });
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window.addEventListener('touchend', (e) => {
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this.handleMouseUp();
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});
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window.addEventListener('keydown', (e) => {
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if ((e.key === 'Delete' || e.key === 'Backspace') && this.selectedDrawing) {
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this.drawings = this.drawings.filter(d => d !== this.selectedDrawing);
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this.selectedDrawing = null;
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this.update();
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}
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});
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this.drawingPrimitive = {
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attached: (param) => {
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this.requestUpdate = param.requestUpdate;
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},
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detached: () => {
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this.requestUpdate = undefined;
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},
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updateAllViews: () => {},
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paneViews: () => [{
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renderer: () => ({
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draw: (target) => this.render(target)
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})
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}],
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priceAxisViews: () => this.getPriceAxisViews(),
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timeAxisViews: () => this.getTimeAxisViews()
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};
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this.series.attachPrimitive(this.drawingPrimitive);
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}
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getPriceAxisViews() {
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const views = [];
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const drawingsToShow = [];
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if (this.currentDrawing && this.currentDrawing.type === 'measure') drawingsToShow.push(this.currentDrawing);
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if (this.selectedDrawing && this.selectedDrawing.type === 'measure') drawingsToShow.push(this.selectedDrawing);
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drawingsToShow.forEach(d => {
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const isUp = d.p2.price >= d.p1.price;
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const color = isUp ? '#26a69a' : '#ef5350';
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[d.p1.price, d.p2.price].forEach(price => {
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views.push({
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coordinate: () => this.series.priceToCoordinate(price),
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text: () => price.toFixed(2),
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textColor: () => '#ffffff',
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backColor: () => color,
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visible: () => true,
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});
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});
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});
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return views;
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}
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getTimeAxisViews() {
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const views = [];
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const drawingsToShow = [];
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if (this.currentDrawing && this.currentDrawing.type === 'measure') drawingsToShow.push(this.currentDrawing);
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if (this.selectedDrawing && this.selectedDrawing.type === 'measure') drawingsToShow.push(this.selectedDrawing);
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drawingsToShow.forEach(d => {
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const isUp = d.p2.price >= d.p1.price;
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const color = isUp ? '#26a69a' : '#ef5350';
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[d.p1.time, d.p2.time].forEach(time => {
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views.push({
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coordinate: () => this.chart.timeScale().timeToCoordinate(time),
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text: () => {
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const date = new Date(time * 1000);
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const day = date.getDate().toString().padStart(2, '0');
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const months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
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const month = months[date.getMonth()];
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const year = date.getFullYear().toString().slice(-2);
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const hours = date.getHours().toString().padStart(2, '0');
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const mins = date.getMinutes().toString().padStart(2, '0');
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return `${day} ${month} '${year} ${hours}:${mins}`;
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},
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textColor: () => '#ffffff',
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backColor: () => color,
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visible: () => true,
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});
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});
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});
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return views;
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}
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touchToMouseEvent(e) {
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const touch = e.touches[0] || e.changedTouches[0];
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return {
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clientX: touch.clientX,
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clientY: touch.clientY,
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shiftKey: e.shiftKey,
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preventDefault: () => e.preventDefault()
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};
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}
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updateChartInteractions() {
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const isInteracting = this.activeTool !== null || this.currentDrawing !== null || (this.selectedDrawing !== null && this.isMouseDown);
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this.chart.applyOptions({
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handleScroll: {
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mouseWheel: !isInteracting,
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pressedMouseMove: !isInteracting,
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horzTouchDrag: !isInteracting,
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vertTouchDrag: !isInteracting,
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},
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handleScale: {
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axisPressedMouseMove: !isInteracting,
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mouseWheel: !isInteracting,
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pinch: !isInteracting,
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}
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});
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}
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setTool(tool) {
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this.activeTool = tool;
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if (tool === 'cursor') {
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this.activeTool = null;
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document.body.style.cursor = 'default';
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} else if (tool === 'clear') {
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this.drawings = [];
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this.selectedDrawing = null;
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this.activeTool = null;
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this.update();
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} else {
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document.body.style.cursor = 'crosshair';
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this.selectedDrawing = null;
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}
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this.updateChartInteractions();
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this.update();
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}
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getMousePos(e) {
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const rect = this.container.getBoundingClientRect();
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const x = e.clientX - rect.left;
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const y = e.clientY - rect.top;
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const timeScale = this.chart.timeScale();
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const candleData = this.dashboard.allData.get(this.dashboard.currentInterval) || [];
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let time = timeScale.coordinateToTime(x);
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if (time === null && candleData.length > 0) {
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// Coordinate is likely in the future whitespace
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const logical = timeScale.coordinateToLogical(x);
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if (logical !== null) {
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const lastIdx = candleData.length - 1;
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const lastCandle = candleData[lastIdx];
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// Logical index of the last candle is roughly 'lastIdx'
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// (though logical range might have offsets, this is a good approximation for snapping)
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const offset = logical - lastIdx;
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if (offset > 0) {
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const intervalSec = this.getIntervalSeconds();
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time = lastCandle.time + Math.round(offset) * intervalSec;
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} else {
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// It's in the past but coordinateToTime failed (rare)
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time = candleData[0].time;
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}
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}
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}
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const price = this.series.coordinateToPrice(y);
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return { x, y, time, price };
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}
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handleMouseDown(e) {
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const pos = this.getMousePos(e);
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this.isMouseDown = true;
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this.dragStartPos = pos;
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// Shift + Click shortcut for Measurement Tool
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if (e.shiftKey && !this.activeTool) {
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this.setTool('measure');
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this.currentDrawing = {
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type: 'measure',
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p1: { time: pos.time, price: pos.price },
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p2: { time: pos.time, price: pos.price },
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color: '#26a69a'
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};
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this.update();
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return;
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}
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// Click-Move-Click logic for Measurement Tool
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if (this.activeTool === 'measure') {
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if (this.currentDrawing) {
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// 2nd Click: Finish
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this.drawings.push(this.currentDrawing);
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this.currentDrawing = null;
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this.setTool(null);
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this.isMouseDown = false;
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this.update();
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return;
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} else {
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// 1st Click: Start
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this.currentDrawing = {
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type: 'measure',
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p1: { time: pos.time, price: pos.price },
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p2: { time: pos.time, price: pos.price },
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color: '#26a69a',
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labelOffset: { x: 0, y: 0 }
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};
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this.update();
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return;
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}
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}
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if (!this.activeTool) {
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const hit = this.findHit(pos.x, pos.y);
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if (hit) {
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this.selectedDrawing = hit.drawing;
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this.dragMode = hit.part;
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const d = this.selectedDrawing;
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if (d.p1) this.startP1 = { ...d.p1 };
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if (d.p2) this.startP2 = { ...d.p2 };
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if (d.price !== undefined) this.startPrice = d.price;
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if (d.time !== undefined) this.startTime = d.time;
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this.updateChartInteractions();
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this.update();
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return;
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} else {
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this.selectedDrawing = null;
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this.dragMode = null;
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}
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}
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if (!this.activeTool || pos.time === null || pos.price === null) {
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this.update();
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return;
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}
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const color = '#2962ff';
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const p1 = { time: pos.time, price: pos.price };
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const p2 = { time: pos.time, price: pos.price };
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if (this.activeTool === 'trend_line' || this.activeTool === 'ray' || this.activeTool === 'rectangle') {
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this.currentDrawing = { type: this.activeTool, p1, p2, color };
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} else if (this.activeTool === 'horizontal_line') {
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this.drawings.push({ type: 'horizontal_line', price: pos.price, color });
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this.setTool(null);
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} else if (this.activeTool === 'vertical_line') {
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this.drawings.push({ type: 'vertical_line', time: pos.time, color });
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this.setTool(null);
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} else if (this.activeTool === 'fib_retracement') {
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this.currentDrawing = { type: 'fib_retracement', p1, p2, color: '#fb8c00' };
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} else if (this.activeTool === 'arrow_up' || this.activeTool === 'arrow_down') {
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this.drawings.push({
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type: 'arrow', time: pos.time, price: pos.price,
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direction: this.activeTool === 'arrow_up' ? 'up' : 'down',
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color: this.activeTool === 'arrow_up' ? '#26a69a' : '#ef5350'
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});
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this.setTool(null);
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} else if (this.activeTool === 'text') {
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const text = prompt('Enter text:');
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if (text) this.drawings.push({ type: 'text', time: pos.time, price: pos.price, text, color: '#ffffff' });
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this.setTool(null);
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}
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this.update();
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}
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handleMouseMove(e) {
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const pos = this.getMousePos(e);
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// Hover cursor logic
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if (!this.isMouseDown && !this.activeTool) {
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const hit = this.findHit(pos.x, pos.y);
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if (hit) {
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this.container.style.cursor = hit.part === 'label' ? 'move' : 'pointer';
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} else {
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this.container.style.cursor = 'default';
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}
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}
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// Track measurement even if mouse is up (Click-Move-Click)
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if (this.currentDrawing && this.currentDrawing.type === 'measure') {
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if (pos.time !== null) {
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this.currentDrawing.p2 = { time: pos.time, price: pos.price };
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this.update();
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}
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return;
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}
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if (!this.isMouseDown) return;
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if (this.selectedDrawing && this.dragMode) {
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if (pos.time === null || pos.price === null) return;
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const d = this.selectedDrawing;
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if (this.dragMode === 'label') {
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// Free movement of ONLY the label field
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const dx = pos.x - this.dragStartPos.x;
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const dy = pos.y - this.dragStartPos.y;
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d.labelOffset.x += dx;
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d.labelOffset.y += dy;
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this.dragStartPos = pos;
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this.update();
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return; // Critical: exit here so we don't move measurement points
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}
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if (this.dragMode === 'p1') {
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d.p1 = { time: pos.time, price: pos.price };
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} else if (this.dragMode === 'p2') {
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d.p2 = { time: pos.time, price: pos.price };
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} else if (this.dragMode === 'all') {
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const timeDiff = pos.time - this.dragStartPos.time;
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const priceDiff = pos.price - this.dragStartPos.price;
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if (d.p1 && d.p2) {
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d.p1.time = this.startP1.time + timeDiff;
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d.p1.price = this.startP1.price + priceDiff;
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d.p2.time = this.startP2.time + timeDiff;
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d.p2.price = this.startP2.price + priceDiff;
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} else if (d.time !== undefined && d.price !== undefined) {
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d.time = this.startTime + timeDiff;
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d.price = this.startPrice + priceDiff;
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} else if (d.price !== undefined) {
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d.price = this.startPrice + priceDiff;
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} else if (d.time !== undefined) {
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d.time = this.startTime + timeDiff;
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}
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} else if (this.dragMode === 'price') {
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d.price = pos.price;
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} else if (this.dragMode === 'time') {
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d.time = pos.time;
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}
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this.update();
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return;
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}
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if (this.currentDrawing && pos.time !== null) {
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this.currentDrawing.p2 = { time: pos.time, price: pos.price };
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this.update();
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}
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}
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handleMouseUp() {
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if (this.currentDrawing && this.currentDrawing.type === 'measure') {
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this.isMouseDown = false;
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this.updateChartInteractions();
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this.update();
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return;
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}
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if (this.currentDrawing) {
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this.drawings.push(this.currentDrawing);
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this.currentDrawing = null;
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this.setTool(null);
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}
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this.dragMode = null;
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this.isMouseDown = false;
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this.updateChartInteractions();
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this.update();
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}
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findHit(x, y) {
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const threshold = 10;
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for (let i = this.drawings.length - 1; i >= 0; i--) {
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const d = this.drawings[i];
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// Check for label hit first (highest z-order)
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if (d.type === 'measure' && d.labelPos) {
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if (x >= d.labelPos.x && x <= d.labelPos.x + d.labelPos.width &&
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y >= d.labelPos.y && y <= d.labelPos.y + d.labelPos.height) {
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return { drawing: d, part: 'label' };
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}
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}
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if (d.p1 && d.p2) {
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const x1 = this.chart.timeScale().timeToCoordinate(d.p1.time);
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const y1 = this.series.priceToCoordinate(d.p1.price);
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const x2 = this.chart.timeScale().timeToCoordinate(d.p2.time);
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const y2 = this.series.priceToCoordinate(d.p2.price);
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if (x1 === null || y1 === null || x2 === null || y2 === null) continue;
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if (Math.hypot(x - x1, y - y1) < threshold) return { drawing: d, part: 'p1' };
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if (Math.hypot(x - x2, y - y2) < threshold) return { drawing: d, part: 'p2' };
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if (d.type === 'rectangle' || d.type === 'measure') {
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if (x >= Math.min(x1, x2) && x <= Math.max(x1, x2) && y >= Math.min(y1, y2) && y <= Math.max(y1, y2)) return { drawing: d, part: 'all' };
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} else {
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const dist = this.distToSegment({ x, y }, { x: x1, y: y1 }, { x: x2, y: y2 });
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if (dist < threshold) return { drawing: d, part: 'all' };
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}
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} else if (d.price !== undefined && d.type === 'horizontal_line') {
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const dy = this.series.priceToCoordinate(d.price);
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if (Math.abs(y - dy) < threshold) return { drawing: d, part: 'price' };
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} else if (d.time !== undefined && d.type === 'vertical_line') {
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const dx = this.chart.timeScale().timeToCoordinate(d.time);
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if (Math.abs(x - dx) < threshold) return { drawing: d, part: 'time' };
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} else if (d.time !== undefined && d.price !== undefined) {
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const dx = this.chart.timeScale().timeToCoordinate(d.time);
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const dy = this.series.priceToCoordinate(d.price);
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if (Math.hypot(x - dx, y - dy) < threshold) return { drawing: d, part: 'all' };
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}
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}
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return null;
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}
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distToSegment(p, v, w) {
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const l2 = Math.pow(v.x - w.x, 2) + Math.pow(v.y - w.y, 2);
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if (l2 === 0) return Math.hypot(p.x - v.x, p.y - v.y);
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let t = ((p.x - v.x) * (w.x - v.x) + (p.y - v.y) * (w.y - v.y)) / l2;
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t = Math.max(0, Math.min(1, t));
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return Math.hypot(p.x - (v.x + t * (w.x - v.x)), p.y - (v.y + t * (w.y - v.y)));
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}
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update() {
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if (this.requestUpdate) this.requestUpdate();
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}
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getIntervalSeconds() {
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const interval = this.dashboard.currentInterval;
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const unit = interval.slice(-1);
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const value = parseInt(interval.slice(0, -1));
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switch (unit) {
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case 'm': return value * 60;
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case 'h': return value * 3600;
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case 'd': return value * 86400;
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case 'w': return value * 604800;
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case 'M': return value * 2592000;
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default: return 60;
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}
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}
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snapToNearestTime(time) {
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if (time === null) return null;
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const candleData = this.dashboard.allData.get(this.dashboard.currentInterval) || [];
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if (candleData.length === 0) return time;
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const lastCandle = candleData[candleData.length - 1];
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if (time > lastCandle.time) {
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// Snapping for the future area
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const intervalSec = this.getIntervalSeconds();
|
|
const diff = time - lastCandle.time;
|
|
const numIntervals = Math.round(diff / intervalSec);
|
|
return lastCandle.time + (numIntervals * intervalSec);
|
|
}
|
|
|
|
// Find nearest timestamp in current data
|
|
let nearest = candleData[0].time;
|
|
let minDiff = Math.abs(time - nearest);
|
|
|
|
// Optimization: check if it's already a match
|
|
if (candleData.find(c => c.time === time)) return time;
|
|
|
|
for (let i = 1; i < candleData.length; i++) {
|
|
const diff = Math.abs(time - candleData[i].time);
|
|
if (diff < minDiff) {
|
|
minDiff = diff;
|
|
nearest = candleData[i].time;
|
|
} else if (diff > minDiff) {
|
|
// Since it's sorted, once diff starts increasing, we've found the closest
|
|
break;
|
|
}
|
|
}
|
|
return nearest;
|
|
}
|
|
|
|
render(target) {
|
|
target.useMediaCoordinateSpace((scope) => {
|
|
const ctx = scope.context;
|
|
const chart = this.chart;
|
|
const series = this.series;
|
|
const allDrawings = [...this.drawings];
|
|
if (this.currentDrawing) allDrawings.push(this.currentDrawing);
|
|
|
|
allDrawings.forEach(d => {
|
|
const isSelected = d === this.selectedDrawing;
|
|
ctx.save();
|
|
ctx.strokeStyle = d.color;
|
|
ctx.lineWidth = isSelected ? 3 : 2;
|
|
if (isSelected) { ctx.shadowBlur = 5; ctx.shadowColor = d.color; }
|
|
|
|
if (d.type === 'trend_line' || d.type === 'ray') {
|
|
const x1 = chart.timeScale().timeToCoordinate(this.snapToNearestTime(d.p1.time));
|
|
const y1 = series.priceToCoordinate(d.p1.price);
|
|
const x2 = chart.timeScale().timeToCoordinate(this.snapToNearestTime(d.p2.time));
|
|
const y2 = series.priceToCoordinate(d.p2.price);
|
|
if (x1 !== null && y1 !== null && x2 !== null && y2 !== null) {
|
|
ctx.beginPath();
|
|
ctx.moveTo(x1, y1);
|
|
if (d.type === 'ray') {
|
|
const angle = Math.atan2(y2 - y1, x2 - x1);
|
|
ctx.lineTo(x1 + Math.cos(angle) * 10000, y1 + Math.sin(angle) * 10000);
|
|
} else {
|
|
ctx.lineTo(x2, y2);
|
|
}
|
|
ctx.stroke();
|
|
if (isSelected) {
|
|
ctx.fillStyle = '#ffffff';
|
|
ctx.beginPath(); ctx.arc(x1, y1, 5, 0, Math.PI * 2); ctx.fill(); ctx.stroke();
|
|
ctx.beginPath(); ctx.arc(x2, y2, 5, 0, Math.PI * 2); ctx.fill(); ctx.stroke();
|
|
}
|
|
}
|
|
} else if (d.type === 'rectangle') {
|
|
const x1 = chart.timeScale().timeToCoordinate(this.snapToNearestTime(d.p1.time));
|
|
const y1 = series.priceToCoordinate(d.p1.price);
|
|
const x2 = chart.timeScale().timeToCoordinate(this.snapToNearestTime(d.p2.time));
|
|
const y2 = series.priceToCoordinate(d.p2.price);
|
|
if (x1 !== null && y1 !== null && x2 !== null && y2 !== null) {
|
|
ctx.fillStyle = d.color + '22';
|
|
ctx.fillRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2 - x1), Math.abs(y2 - y1));
|
|
ctx.strokeRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2 - x1), Math.abs(y2 - y1));
|
|
if (isSelected) {
|
|
ctx.fillStyle = '#ffffff';
|
|
ctx.beginPath(); ctx.arc(x1, y1, 5, 0, Math.PI * 2); ctx.fill(); ctx.stroke();
|
|
ctx.beginPath(); ctx.arc(x2, y2, 5, 0, Math.PI * 2); ctx.fill(); ctx.stroke();
|
|
}
|
|
}
|
|
} else if (d.type === 'horizontal_line') {
|
|
const y = series.priceToCoordinate(d.price);
|
|
if (y !== null) {
|
|
ctx.beginPath();
|
|
ctx.moveTo(0, y);
|
|
ctx.lineTo(scope.mediaSize.width, y);
|
|
ctx.stroke();
|
|
}
|
|
} else if (d.type === 'vertical_line') {
|
|
const x = chart.timeScale().timeToCoordinate(this.snapToNearestTime(d.time));
|
|
if (x !== null) {
|
|
ctx.beginPath();
|
|
ctx.moveTo(x, 0);
|
|
ctx.lineTo(x, scope.mediaSize.height);
|
|
ctx.stroke();
|
|
}
|
|
} else if (d.type === 'fib_retracement') {
|
|
const x1 = chart.timeScale().timeToCoordinate(this.snapToNearestTime(d.p1.time));
|
|
const y1 = series.priceToCoordinate(d.p1.price);
|
|
const x2 = chart.timeScale().timeToCoordinate(this.snapToNearestTime(d.p2.time));
|
|
const y2 = series.priceToCoordinate(d.p2.price);
|
|
if (x1 !== null && y1 !== null && x2 !== null && y2 !== null) {
|
|
const levels = [0, 0.236, 0.382, 0.5, 0.618, 0.786, 1];
|
|
const range = d.p2.price - d.p1.price;
|
|
ctx.setLineDash([5, 5]); ctx.lineWidth = 1;
|
|
levels.forEach(level => {
|
|
const price = d.p1.price + (range * level);
|
|
const y = series.priceToCoordinate(price);
|
|
if (y !== null) {
|
|
ctx.beginPath(); ctx.moveTo(Math.min(x1, x2), y); ctx.lineTo(Math.max(x1, x2), y); ctx.stroke();
|
|
ctx.fillStyle = d.color; ctx.font = '10px Inter';
|
|
ctx.fillText(`${(level * 100).toFixed(1)}% (${price.toFixed(2)})`, Math.max(x1, x2) + 5, y + 3);
|
|
}
|
|
});
|
|
ctx.setLineDash([]); ctx.strokeStyle = d.color + '44';
|
|
ctx.beginPath(); ctx.moveTo(x1, y1); ctx.lineTo(x2, y2); ctx.stroke();
|
|
if (isSelected) {
|
|
ctx.fillStyle = '#ffffff'; ctx.strokeStyle = d.color; ctx.lineWidth = 2;
|
|
ctx.beginPath(); ctx.arc(x1, y1, 5, 0, Math.PI * 2); ctx.fill(); ctx.stroke();
|
|
ctx.beginPath(); ctx.arc(x2, y2, 5, 0, Math.PI * 2); ctx.fill(); ctx.stroke();
|
|
}
|
|
}
|
|
} else if (d.type === 'arrow') {
|
|
const x = chart.timeScale().timeToCoordinate(this.snapToNearestTime(d.time));
|
|
const y = series.priceToCoordinate(d.price);
|
|
if (x !== null && y !== null) {
|
|
ctx.fillStyle = d.color; ctx.beginPath();
|
|
const size = isSelected ? 15 : 10;
|
|
if (d.direction === 'up') {
|
|
ctx.moveTo(x, y);
|
|
ctx.lineTo(x - size/2, y + size);
|
|
ctx.lineTo(x + size/2, y + size);
|
|
} else {
|
|
ctx.moveTo(x, y);
|
|
ctx.lineTo(x - size/2, y - size);
|
|
ctx.lineTo(x + size/2, y - size);
|
|
}
|
|
ctx.fill();
|
|
if (isSelected) { ctx.strokeStyle = '#ffffff'; ctx.lineWidth = 1; ctx.stroke(); }
|
|
}
|
|
} else if (d.type === 'text') {
|
|
const x = chart.timeScale().timeToCoordinate(this.snapToNearestTime(d.time));
|
|
const y = series.priceToCoordinate(d.price);
|
|
if (x !== null && y !== null) {
|
|
ctx.fillStyle = d.color;
|
|
ctx.font = isSelected ? 'bold 14px Inter' : '12px Inter';
|
|
ctx.fillText(d.text, x, y);
|
|
if (isSelected) {
|
|
const metrics = ctx.measureText(d.text);
|
|
ctx.strokeStyle = d.color;
|
|
ctx.strokeRect(x - 2, y - 12, metrics.width + 4, 16);
|
|
}
|
|
}
|
|
} else if (d.type === 'measure') {
|
|
const x1 = chart.timeScale().timeToCoordinate(this.snapToNearestTime(d.p1.time));
|
|
const y1 = series.priceToCoordinate(d.p1.price);
|
|
const x2 = chart.timeScale().timeToCoordinate(this.snapToNearestTime(d.p2.time));
|
|
const y2 = series.priceToCoordinate(d.p2.price);
|
|
|
|
if (x1 !== null && y1 !== null && x2 !== null && y2 !== null) {
|
|
|
|
const priceDiff = d.p2.price - d.p1.price;
|
|
const percentChange = (priceDiff / d.p1.price) * 100;
|
|
const isUp = priceDiff >= 0;
|
|
const color = isUp ? '#26a69a' : '#ef5350';
|
|
|
|
// 1. Draw Measurement Area
|
|
ctx.fillStyle = color + '33';
|
|
ctx.fillRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2 - x1), Math.abs(y2 - y1));
|
|
|
|
// 2. Draw Crosshairs & Arrows
|
|
ctx.strokeStyle = color;
|
|
ctx.lineWidth = 1;
|
|
|
|
// Horizontal line
|
|
ctx.beginPath();
|
|
ctx.moveTo(Math.min(x1, x2), (y1 + y2) / 2);
|
|
ctx.lineTo(Math.max(x1, x2), (y1 + y2) / 2);
|
|
ctx.stroke();
|
|
|
|
// Vertical line
|
|
ctx.beginPath();
|
|
ctx.moveTo((x1 + x2) / 2, Math.min(y1, y2));
|
|
ctx.lineTo((x1 + x2) / 2, Math.max(y1, y2));
|
|
ctx.stroke();
|
|
|
|
// Draw Arrows at ends of crosshairs
|
|
const drawArrow = (x, y, angle) => {
|
|
ctx.save();
|
|
ctx.translate(x, y);
|
|
ctx.rotate(angle);
|
|
ctx.beginPath();
|
|
ctx.moveTo(-6, -4);
|
|
ctx.lineTo(0, 0);
|
|
ctx.lineTo(-6, 4);
|
|
ctx.stroke();
|
|
ctx.restore();
|
|
};
|
|
|
|
// Time arrow (horizontal)
|
|
if (x2 > x1) drawArrow(x2, (y1 + y2) / 2, 0);
|
|
else drawArrow(x2, (y1 + y2) / 2, Math.PI);
|
|
|
|
// Price arrow (vertical)
|
|
if (y2 < y1) drawArrow((x1 + x2) / 2, y2, -Math.PI/2);
|
|
else drawArrow((x1 + x2) / 2, y2, Math.PI/2);
|
|
|
|
// 3. Data Calculation
|
|
// Bar count
|
|
const candleData = this.dashboard.allData.get(this.dashboard.currentInterval) || [];
|
|
const startIdx = candleData.findIndex(c => c.time === this.snapToNearestTime(d.p1.time));
|
|
const endIdx = candleData.findIndex(c => c.time === this.snapToNearestTime(d.p2.time));
|
|
let barCount = 0;
|
|
let totalVol = 0;
|
|
if (startIdx !== -1 && endIdx !== -1) {
|
|
barCount = endIdx - startIdx;
|
|
const minIdx = Math.min(startIdx, endIdx);
|
|
const maxIdx = Math.max(startIdx, endIdx);
|
|
for (let i = minIdx; i <= maxIdx; i++) {
|
|
totalVol += candleData[i].volume || 0;
|
|
}
|
|
} else {
|
|
// Rough estimate if not in current data
|
|
const intervalSeconds = 60; // Default fallback
|
|
barCount = Math.round((d.p2.time - d.p1.time) / intervalSeconds);
|
|
}
|
|
|
|
// Time duration
|
|
const diffSec = Math.abs(d.p2.time - d.p1.time);
|
|
let timeStr = "";
|
|
if (diffSec >= 86400) {
|
|
const days = Math.floor(diffSec / 86400);
|
|
const hours = Math.floor((diffSec % 86400) / 3600);
|
|
const mins = Math.floor((diffSec % 3600) / 60);
|
|
timeStr = `${days}d${hours > 0 ? ` ${hours}h` : ''}${mins > 0 ? ` ${mins}m` : ''}`;
|
|
} else {
|
|
const hours = Math.floor(diffSec / 3600);
|
|
const mins = Math.floor((diffSec % 3600) / 60);
|
|
timeStr = `${hours}h${mins > 0 ? ` ${mins}m` : ''}`;
|
|
}
|
|
|
|
const volStr = totalVol > 1000 ? `${(totalVol/1000).toFixed(3)}K` : totalVol.toFixed(0);
|
|
|
|
// 4. Draw Label Box
|
|
const labelLines = [
|
|
`${priceDiff.toFixed(2)} (${percentChange.toFixed(2)}%) , ${Math.round(priceDiff * 100)}`,
|
|
`${barCount} bars, ${timeStr}`,
|
|
`Vol ${volStr}`
|
|
];
|
|
|
|
ctx.font = '500 12px Inter';
|
|
const labelWidth = Math.max(...labelLines.map(l => ctx.measureText(l).width)) + 24;
|
|
const labelHeight = 65;
|
|
|
|
// Natural position: Centered horizontally at midpoint,
|
|
// vertically offset from the top/bottom edge.
|
|
// This makes the label follow the box edges correctly during resize.
|
|
const midX = (x1 + x2) / 2;
|
|
const topY = Math.min(y1, y2);
|
|
const bottomY = Math.max(y1, y2);
|
|
|
|
const defaultLabelX = midX - labelWidth / 2;
|
|
const defaultLabelY = isUp ? topY - labelHeight - 10 : bottomY + 10;
|
|
|
|
const labelX = defaultLabelX + (d.labelOffset?.x || 0);
|
|
const labelY = defaultLabelY + (d.labelOffset?.y || 0);
|
|
|
|
// Store label position for hit detection
|
|
d.labelPos = { x: labelX, y: labelY, width: labelWidth, height: labelHeight };
|
|
|
|
// Solid Box
|
|
ctx.fillStyle = color;
|
|
this.roundRect(ctx, labelX, labelY, labelWidth, labelHeight, 4);
|
|
ctx.fill();
|
|
|
|
// Text
|
|
ctx.fillStyle = '#ffffff';
|
|
ctx.textAlign = 'center';
|
|
labelLines.forEach((line, i) => {
|
|
ctx.fillText(line, labelX + labelWidth/2, labelY + 20 + (i * 18));
|
|
});
|
|
|
|
if (isSelected) {
|
|
ctx.strokeStyle = '#ffffff'; ctx.lineWidth = 2;
|
|
ctx.beginPath(); ctx.arc(x1, y1, 5, 0, Math.PI * 2); ctx.stroke();
|
|
ctx.beginPath(); ctx.arc(x2, y2, 5, 0, Math.PI * 2); ctx.stroke();
|
|
}
|
|
}
|
|
}
|
|
ctx.restore();
|
|
});
|
|
});
|
|
}
|
|
|
|
roundRect(ctx, x, y, width, height, radius) {
|
|
ctx.beginPath();
|
|
ctx.moveTo(x + radius, y);
|
|
ctx.lineTo(x + width - radius, y);
|
|
ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
|
|
ctx.lineTo(x + width, y + height - radius);
|
|
ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
|
|
ctx.lineTo(x + radius, y + height);
|
|
ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
|
|
ctx.lineTo(x, y + radius);
|
|
ctx.quadraticCurveTo(x, y, x + radius, y);
|
|
ctx.closePath();
|
|
}
|
|
}
|