import 'package:fl_chart/fl_chart.dart'; import 'package:flutter/material.dart'; import 'package:hmg_patient_app_new/core/common_models/data_points.dart'; import 'package:hmg_patient_app_new/core/utils/size_utils.dart'; import 'package:hmg_patient_app_new/theme/colors.dart'; /// A customizable line graph widget using `fl_chart`. /// /// Displays a line chart with configurable axis labels, colors, and data points. /// Useful for visualizing time series or other sequential data. /// /// **Parameters:** /// - [dataPoints]: List of `DataPoint` objects to plot. /// - [secondaryDataPoints]: Optional list for a second line (e.g., diastolic in blood pressure). /// - [leftLabelFormatter]: Function to build left axis labels. /// - [bottomLabelFormatter]: Function to build bottom axis labels. /// - [width]: Optional width of the chart. /// - [height]: Required height of the chart. /// - [maxY], [maxX], [minX]: Axis bounds. /// - [spotColor]: Color of the touched spot marker. /// - [graphColor]: Color of the line. /// - [secondaryGraphColor]: Color of the secondary line. /// - [graphShadowColor]: Color of the area below the line. /// - [graphGridColor]: Color of the grid lines. /// - [bottomLabelColor]: Color of bottom axis labels. /// - [bottomLabelSize]: Font size for bottom axis labels. /// - [bottomLabelFontWeight]: Font weight for bottom axis labels. /// - [leftLabelInterval]: Interval between left axis labels. /// - [leftLabelReservedSize]: Reserved space for left axis labels. /// - [scrollDirection]: Axis direction for scrolling. /// - [showBottomTitleDates]: Whether to show bottom axis labels. /// - [isFullScreeGraph]: Whether the graph is fullscreen. /// - [makeGraphBasedOnActualValue]: Use `actualValue` for plotting. /// /// Example usage: /// ```dart /// CustomGraph( /// dataPoints: sampleData, /// leftLabelFormatter: (value) => ..., /// bottomLabelFormatter: (value, dataPoints) => ..., /// height: 200, /// scrollDirection: Axis.horizontal, /// maxY: 100, /// maxX: 2.5, /// ) class CustomGraph extends StatelessWidget { final List dataPoints; final List? secondaryDataPoints; // For dual-line graphs (e.g., blood pressure) final double? width; final double height; final double? maxY; final double? maxX; final double? minX; final Color spotColor; final Color graphColor; final Color? secondaryGraphColor; // Color for secondary line final Color graphShadowColor; final Color graphGridColor; final Color bottomLabelColor; final double? bottomLabelSize; final FontWeight? bottomLabelFontWeight; final double? leftLabelInterval; final double? leftLabelReservedSize; final double? bottomLabelReservedSize; final bool? showGridLines; final GetDrawingGridLine? getDrawingHorizontalLine; final double? horizontalInterval; final double? minY; final bool showShadow; final bool showLinePoints; final double? cutOffY; final RangeAnnotations? rangeAnnotations; ///creates the left label and provide it to the chart as it will be used by other part of the application so the label will be different for every chart final Widget Function(double) leftLabelFormatter; final Widget Function(double, List) bottomLabelFormatter; final Axis scrollDirection; final bool showBottomTitleDates; final bool isFullScreeGraph; final bool makeGraphBasedOnActualValue; const CustomGraph( {super.key, required this.dataPoints, this.secondaryDataPoints, required this.leftLabelFormatter, this.width, required this.scrollDirection, required this.height, this.maxY, this.maxX, this.showBottomTitleDates = true, this.isFullScreeGraph = false, this.spotColor = AppColors.bgGreenColor, this.graphColor = AppColors.bgGreenColor, this.secondaryGraphColor, this.graphShadowColor = AppColors.graphGridColor, this.graphGridColor = AppColors.graphGridColor, this.bottomLabelColor = AppColors.textColor, this.bottomLabelFontWeight = FontWeight.w500, this.bottomLabelSize, this.leftLabelInterval, this.leftLabelReservedSize, this.bottomLabelReservedSize, this.makeGraphBasedOnActualValue = false, required this.bottomLabelFormatter, this.minX, this.showGridLines = false, this.getDrawingHorizontalLine, this.horizontalInterval, this.minY, this.showShadow = false, this.showLinePoints = false, this.cutOffY = 0, this.rangeAnnotations}); @override Widget build(BuildContext context) { return Material( color: Colors.white, child: SizedBox( width: width, height: height, child: LineChart( LineChartData( minY: minY ?? 0, maxY: maxY, maxX: maxX, minX: minX, lineTouchData: LineTouchData( getTouchLineEnd: (_, __) => 0, getTouchedSpotIndicator: (barData, indicators) { // Only show custom marker for touched spot return indicators.map((int index) { return TouchedSpotIndicatorData( FlLine(color: Colors.transparent), FlDotData( show: true, getDotPainter: (spot, percent, barData, idx) { return FlDotCirclePainter( radius: 8, color: spotColor, strokeWidth: 2, strokeColor: Colors.white, ); }, ), ); }).toList(); }, enabled: true, touchTooltipData: LineTouchTooltipData( getTooltipColor: (_) => Colors.white, getTooltipItems: (touchedSpots) { if (touchedSpots.isEmpty) return []; // Only show tooltip for the first touched spot, hide others return touchedSpots.map((spot) { if (spot == touchedSpots.first) { final dataPoint = dataPoints[spot.x.toInt()]; return LineTooltipItem( '${dataPoint.actualValue} ${dataPoint.unitOfMeasurement ?? ""} - ${dataPoint.displayTime}', TextStyle(color: Colors.black, fontSize: 12.f, fontWeight: FontWeight.w500), ); } return null; // hides the rest }).toList(); }, ), ), titlesData: FlTitlesData( leftTitles: AxisTitles( sideTitles: SideTitles( showTitles: true, reservedSize: leftLabelReservedSize ?? 80, interval: leftLabelInterval ?? .1, // Let fl_chart handle it getTitlesWidget: (value, _) { return leftLabelFormatter(value); }, ), ), bottomTitles: AxisTitles( axisNameSize: 20, sideTitles: SideTitles( showTitles: showBottomTitleDates, reservedSize: bottomLabelReservedSize ?? 20, getTitlesWidget: (value, _) { return bottomLabelFormatter(value, dataPoints); }, interval: 1, // ensures 1:1 mapping with spots ), ), topTitles: AxisTitles(), rightTitles: AxisTitles(), ), borderData: FlBorderData( show: true, border: const Border( bottom: BorderSide.none, left: BorderSide(color: Colors.grey, width: .5), right: BorderSide.none, top: BorderSide.none, ), ), lineBarsData: _buildColoredLineSegments(dataPoints, showLinePoints), gridData: FlGridData( show: showGridLines ?? true, drawVerticalLine: false, horizontalInterval: horizontalInterval, // checkToShowHorizontalLine: (value) => // value >= 0 && value <= 100, getDrawingHorizontalLine: getDrawingHorizontalLine ?? (value) { return FlLine( color: graphGridColor, strokeWidth: 1, dashArray: [5, 5], ); }, ), rangeAnnotations: rangeAnnotations), ), ), ); } List _buildColoredLineSegments(List dataPoints, bool showLinePoints) { final List allSpots = dataPoints.asMap().entries.map((entry) { double value = (makeGraphBasedOnActualValue) ? double.tryParse(entry.value.actualValue) ?? 0.0 : entry.value.value; return FlSpot(entry.key.toDouble(), value); }).toList(); var data = [ LineChartBarData( spots: allSpots, isCurved: true, isStrokeCapRound: true, isStrokeJoinRound: true, barWidth: 2, gradient: LinearGradient( colors: [graphColor, graphColor], begin: Alignment.centerLeft, end: Alignment.centerRight, ), dotData: FlDotData(show: showLinePoints), belowBarData: BarAreaData( show: showShadow, applyCutOffY: cutOffY != null, cutOffY: cutOffY ?? 0, gradient: LinearGradient( colors: [ graphShadowColor, Colors.white, ], begin: Alignment.topCenter, end: Alignment.bottomCenter, ), ), ) ]; // Add secondary line if provided (for dual-line graphs like blood pressure) if (secondaryDataPoints != null && secondaryDataPoints!.isNotEmpty) { final List secondarySpots = secondaryDataPoints!.asMap().entries.map((entry) { double value = (makeGraphBasedOnActualValue) ? double.tryParse(entry.value.actualValue) ?? 0.0 : entry.value.value; return FlSpot(entry.key.toDouble(), value); }).toList(); data.add( LineChartBarData( spots: secondarySpots, isCurved: true, isStrokeCapRound: true, isStrokeJoinRound: true, barWidth: 2, gradient: LinearGradient( colors: [secondaryGraphColor ?? AppColors.blueColor, secondaryGraphColor ?? AppColors.blueColor], begin: Alignment.centerLeft, end: Alignment.centerRight, ), dotData: FlDotData(show: showLinePoints), belowBarData: BarAreaData(show: false), ), ); } return data; } }