ChartDataProcessor class

Constructors

ChartDataProcessor()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Properties

processingCacheStats → ChartDataProcessingCacheStats

Current data-processing cache diagnostics.

no setter

Static Methods

clearProcessingCache({bool resetMetrics = true}) → void

Clears memoized processing and extracted-series results.

computeStackedValues(List<Series> series) → List<List<double>>

Compute cumulative (stacked) values per category index.

configureProcessingCache({bool? enabled, int? maxEntries, int? maxBytes, int? minPointCount, bool? extractionCacheEnabled, int? maxExtractionEntries, int? maxExtractionBytes, int? minExtractionPointCount}) → void

Tune processing cache behavior at runtime.

effectiveDataPointCount(List<Series> series, {int? startIndex, int? endIndex}) → int

extractionCacheAdmissionReasonFor(List<Series> series, {bool? useCache, int? startIndex, int? endIndex, ChartDataProcessingCachePolicySnapshot? policy}) → ChartDataCacheAdmissionReason

fiveNumberSummary(List<double> values) → ({double max, double median, double min, double q1, double q3})

Compute standard five-number summary for values.

histogram(List<double> values, {int binCount = 10, double? forcedMin, double? forcedMax}) → List<({int count, double end, double start})>

Compute histogram bins for values into binCount equal-width buckets.

maxStackedValue(List<Series> series) → double

Max stacked value across all categories.

niceYTicks(double min, double max, {int tickCount = 5}) → List<double>

Generate evenly-spaced Y-axis ticks for a min..max range.

normalize(double value, double srcMin, double srcMax, double dstMin, double dstMax) → double

Map value from srcMin..srcMax to dstMin..dstMax.

outputPointCount(List<ProcessedSeries> processed) → int

process(List<Series> series, {int renderThreshold = defaultRenderThreshold, SamplingStrategy? samplingStrategy, int? startIndex, int? endIndex, bool? useCache, String? dataSignature, void onReport(ChartDataProcessingReport report)?}) → ChartProcessingResult

Process all series in a chart, returning ChartStats and per-series ProcessedSeries list.

processingCacheAdmissionReason(List<Series> series, {bool? useCache, int? startIndex, int? endIndex, ChartDataProcessingCachePolicySnapshot? policy}) → ChartDataCacheAdmissionReason

processingCacheKey(List<Series> series, {required int renderThreshold, required SamplingStrategy? samplingStrategy, required int? startIndex, required int? endIndex, required String? dataSignature}) → String

processWithReport(List<Series> series, {int renderThreshold = defaultRenderThreshold, SamplingStrategy? samplingStrategy, int? startIndex, int? endIndex, bool? useCache, String? dataSignature}) → ChartProcessingResultWithReport

Process data and return detailed timing/cache diagnostics.

readProcessingCache(List<Series> series, {int renderThreshold = defaultRenderThreshold, SamplingStrategy? samplingStrategy, int? startIndex, int? endIndex, bool? useCache, String? dataSignature}) → ChartProcessingResult?

readProcessingCacheWithReport(List<Series> series, {int renderThreshold = defaultRenderThreshold, SamplingStrategy? samplingStrategy, int? startIndex, int? endIndex, bool? useCache, String? dataSignature}) → ChartProcessingResultWithReport?

Reads a cached processing result and returns a normalized cache-hit report.

sampleInputPointCount(List<ProcessedSeries> processed) → int

shouldUseExtractionCache(List<Series> series, {bool? useCache, int? startIndex, int? endIndex, ChartDataProcessingCachePolicySnapshot? policy}) → bool

shouldUseProcessingCache(List<Series> series, {bool? useCache, int? startIndex, int? endIndex, ChartDataProcessingCachePolicySnapshot? policy}) → bool

totalDataPoints(List<Series> series) → int

writeProcessingCache(List<Series> series, ChartProcessingResult result, {int renderThreshold = defaultRenderThreshold, SamplingStrategy? samplingStrategy, int? startIndex, int? endIndex, bool? useCache, String? dataSignature}) → bool

writeProcessingCacheWithReport(List<Series> series, ChartProcessingResult result, {int renderThreshold = defaultRenderThreshold, SamplingStrategy? samplingStrategy, int? startIndex, int? endIndex, bool? useCache, String? dataSignature}) → ChartDataProcessingCacheWriteReport

Constants

defaultRenderThreshold → const int

Default render threshold — above this the dataset is sampled.