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{ AdaptedEvent } from '../interfaces';\nimport VelocityTracker from './VelocityTracker';\n\nexport interface TrackerElement {\n lastX: number;\n lastY: number;\n\n timeStamp: number;\n\n velocityX: number;\n velocityY: number;\n}\n\nconst MAX_POINTERS = 20;\n\nexport default class PointerTracker {\n private velocityTracker = new VelocityTracker();\n private trackedPointers: Map = new Map<\n number,\n TrackerElement\n >();\n\n private touchEventsIds: Map = new Map();\n\n private lastMovedPointerId: number;\n\n private cachedAverages: { x: number; y: number } = { x: 0, y: 0 };\n\n public constructor() {\n this.lastMovedPointerId = NaN;\n\n for (let i = 0; i < MAX_POINTERS; ++i) {\n this.touchEventsIds.set(i, NaN);\n }\n }\n\n public addToTracker(event: AdaptedEvent): void {\n if (this.trackedPointers.has(event.pointerId)) {\n return;\n }\n\n this.lastMovedPointerId = event.pointerId;\n\n const newElement: TrackerElement = {\n lastX: event.x,\n lastY: event.y,\n timeStamp: event.time,\n velocityX: 0,\n velocityY: 0,\n };\n\n this.trackedPointers.set(event.pointerId, newElement);\n this.mapTouchEventId(event.pointerId);\n\n this.cachedAverages = {\n x: this.getLastAvgX(),\n y: this.getLastAvgY(),\n };\n }\n\n public removeFromTracker(pointerId: number): void {\n this.trackedPointers.delete(pointerId);\n this.removeMappedTouchId(pointerId);\n }\n\n public track(event: AdaptedEvent): void {\n const element: TrackerElement = this.trackedPointers.get(\n event.pointerId\n ) as TrackerElement;\n\n if (!element) {\n return;\n }\n\n this.lastMovedPointerId = event.pointerId;\n\n this.velocityTracker.add(event);\n const [velocityX, velocityY] = this.velocityTracker.getVelocity();\n\n element.velocityX = velocityX;\n element.velocityY = velocityY;\n\n element.lastX = event.x;\n element.lastY = event.y;\n\n this.trackedPointers.set(event.pointerId, element);\n\n const avgX: number = this.getLastAvgX();\n const avgY: number = this.getLastAvgY();\n\n this.cachedAverages = {\n x: avgX,\n y: avgY,\n };\n }\n\n //Mapping TouchEvents ID\n private mapTouchEventId(id: number): void {\n for (const [mappedId, touchId] of this.touchEventsIds) {\n if (isNaN(touchId)) {\n this.touchEventsIds.set(mappedId, id);\n break;\n }\n }\n }\n\n private removeMappedTouchId(id: number): void {\n const mappedId: number = this.getMappedTouchEventId(id);\n if (!isNaN(mappedId)) {\n this.touchEventsIds.set(mappedId, NaN);\n }\n }\n\n public getMappedTouchEventId(touchEventId: number): number {\n for (const [key, value] of this.touchEventsIds.entries()) {\n if (value === touchEventId) {\n return key;\n }\n }\n\n return NaN;\n }\n\n public getVelocityX(pointerId: number): number {\n return this.trackedPointers.get(pointerId)?.velocityX as number;\n }\n public getVelocityY(pointerId: number): number {\n return this.trackedPointers.get(pointerId)?.velocityY as number;\n }\n\n /**\n * Returns X coordinate of last moved pointer\n */\n public getLastX(): number;\n\n /**\n *\n * @param pointerId\n * Returns X coordinate of given pointer\n */\n // eslint-disable-next-line @typescript-eslint/unified-signatures\n public getLastX(pointerId: number): number;\n\n public getLastX(pointerId?: number): number {\n if (pointerId !== undefined) {\n return this.trackedPointers.get(pointerId)?.lastX as number;\n } else {\n return this.trackedPointers.get(this.lastMovedPointerId)?.lastX as number;\n }\n }\n\n /**\n * Returns Y coordinate of last moved pointer\n */\n public getLastY(): number;\n\n /**\n *\n * @param pointerId\n * Returns Y coordinate of given pointer\n */\n // eslint-disable-next-line @typescript-eslint/unified-signatures\n public getLastY(pointerId: number): number;\n\n public getLastY(pointerId?: number): number {\n if (pointerId !== undefined) {\n return this.trackedPointers.get(pointerId)?.lastY as number;\n } else {\n return this.trackedPointers.get(this.lastMovedPointerId)?.lastY as number;\n }\n }\n\n // Some handlers use these methods to send average values in native event.\n // This may happen when pointers have already been removed from tracker (i.e. pointerup event).\n // In situation when NaN would be sent as a response, we return cached value.\n // That prevents handlers from crashing\n public getLastAvgX(): number {\n const avgX: number = this.getSumX() / this.trackedPointers.size;\n return isNaN(avgX) ? this.cachedAverages.x : avgX;\n }\n public getLastAvgY(): number {\n const avgY: number = this.getSumY() / this.trackedPointers.size;\n return isNaN(avgY) ? this.cachedAverages.y : avgY;\n }\n public getSumX(ignoredPointer?: number): number {\n let sumX = 0;\n\n this.trackedPointers.forEach((value, key) => {\n if (key !== ignoredPointer) {\n sumX += value.lastX;\n }\n });\n\n return sumX;\n }\n public getSumY(ignoredPointer?: number): number {\n let sumY = 0;\n\n this.trackedPointers.forEach((value, key) => {\n if (key !== ignoredPointer) {\n sumY += value.lastY;\n }\n });\n\n return sumY;\n }\n public getTrackedPointersCount(): number {\n return this.trackedPointers.size;\n }\n public getTrackedPointersID(): number[] {\n const keys: number[] = [];\n\n this.trackedPointers.forEach((_value, key) => {\n keys.push(key);\n });\n\n return keys;\n }\n\n public getData(): Map {\n return this.trackedPointers;\n }\n\n public resetTracker(): void {\n this.velocityTracker.reset();\n this.trackedPointers.clear();\n this.lastMovedPointerId = NaN;\n\n for (let i = 0; i < MAX_POINTERS; ++i) {\n this.touchEventsIds.set(i, NaN);\n }\n }\n\n public static shareCommonPointers(\n stPointers: number[],\n ndPointers: number[]\n ): boolean {\n return stPointers.some((pointerId) => ndPointers.includes(pointerId));\n }\n}\n"]}