Added #

• MultiLine Chart JSON Integration - Comprehensive JSON support for multi-line charts with Plotly compatibility
• Multiple Factory Constructors - Added fromJson(), fromJsonString(), fromData(), and fromPlotlyData() constructors
• Advanced JSON Configuration - Support for complex styling, animations, and layout via JSON
• Plotly Compatibility - Seamless conversion from Plotly JSON configurations to multi-line charts
• Enhanced Data Parsing - Support for multiple data formats including arrays and object-based series
• Interactive Features via JSON - Configure zoom, pan, and callback functions through JSON

Features #

• JSON Format Support:
  • Simple format for basic multi-line charts
  • Plotly-compatible format for existing configurations
  • Advanced format with full customization options
• Factory Constructors:
  • MultiLineChart.fromJson() - Create from JSON map
  • MultiLineChart.fromJsonString() - Create from JSON string
  • MultiLineChart.fromData() - Quick creation from arrays
  • MultiLineChart.fromPlotlyData() - Direct Plotly data conversion
• Styling via JSON:
  • Colors, animations, and layout configuration
  • Individual series colors and line properties
  • Grid lines, padding, and interactive options
  • Tooltip styling and crosshair configuration
• Data Format Flexibility:
  • Support for x/y arrays (Plotly format)
  • Support for dataPoints arrays (simple format)
  • Support for data arrays (alternative format)
  • Automatic color parsing from hex, RGB, and RGBA formats

Changed #

• MultiLine Chart Architecture - Enhanced for comprehensive JSON integration
• Data Parsing System - Improved to handle multiple JSON data formats
• Style Configuration - Extended to support full JSON-based customization
• Factory Constructor System - Added multiple convenient constructors for different use cases

Technical Details #

• Performance: Optimized JSON parsing and chart rendering pipeline
• Compatibility: Fully backward compatible with existing multi-line chart implementations
• Migration: Easy conversion from existing multi-line chart implementations
• Error Handling: Comprehensive validation for JSON inputs with graceful fallbacks

Added #

• Enhanced Line Chart Interactive Features - Advanced hover functionality with vertical line indicators
• Customizable Vertical Hover Lines - Support for solid, dashed, and dotted vertical hover line styles
• Advanced Tooltip System - Improved tooltip positioning, styling, and point highlighting
• Enhanced Point Highlighting - Visual feedback with enlarged points and white borders on hover
• Improved Curve Rendering - Better bezier curve algorithms for smoother line connections
• Line Style Enumeration - New LineStyle enum supporting solid, dashed, and dotted line styles

Features #

• Interactive Hover System:
  • Vertical hover line with customizable color, width, style, and opacity
  • Smart tooltip positioning to prevent off-screen display
  • Point highlighting with 1.5x size increase and white border
  • Configurable hover detection distance (20px threshold)
• Enhanced Line Rendering:
  • Improved curved line path generation with better control points
  • Better handling of rounded points for different line types
  • Smoother bezier curve interpolation with intensity control
  • Optimized stroke cap and join handling for curved vs straight lines
• Advanced Tooltip Features:
  • Customizable background, border, and text styling
  • Automatic positioning adjustment to stay within chart bounds
  • Configurable padding and border radius

Changed #

• Line Chart Architecture - Enhanced painter system for better hover interaction handling
• Curve Generation - Improved cubic bezier curve algorithms for smoother line rendering
• Tooltip Positioning - Smart positioning system to prevent tooltip overflow
• Point Rendering - Better visual feedback system for hovered data points

Fixed #

• Curved Line Rendering - Fixed handling of rounded points with curved lines for better visual consistency
• Bezier Curve Smoothness - Improved control point generation for more natural curve transitions
• Tooltip Overflow - Fixed tooltip positioning to prevent display outside chart boundaries
• Hover Detection - Enhanced point detection accuracy with configurable distance thresholds

Technical Details #

• Performance: Optimized hover detection and rendering pipeline
• Compatibility: Fully backward compatible with existing line chart implementations
• Architecture: Enhanced painter system with better separation of concerns
• Styling: Comprehensive styling options for all interactive elements

Added #

• Enhanced Stacked Bar Chart JSON Support - Comprehensive JSON integration for MaterialStackedBarChart
• Factory Constructors for Stacked Bar Charts - Added fromJson(), fromJsonString(), and fromData() constructors
• Interactive Hover Functionality - Enhanced user experience with hover effects on stacked bar charts
• Improved Color Parsing - Better color validation and parsing utilities for JSON configurations
• Plotly Format Support - Seamless conversion from Plotly JSON configurations to stacked bar charts

Features #

• JSON Format Support:
  • Simple format for basic stacked bar charts
  • Plotly-compatible format for existing configurations
  • Advanced format with full customization options
• Factory Constructors:
  • MaterialStackedBarChart.fromJson() - Create from JSON map
  • MaterialStackedBarChart.fromJsonString() - Create from JSON string
  • MaterialStackedBarChart.fromData() - Quick creation from arrays
• Interactive Features:
  • Hover effects with detailed segment information
  • Smooth animations and transitions
  • Responsive design for various screen sizes
• Enhanced Error Handling:
  • Comprehensive validation for JSON inputs
  • Better error messages and debugging support
  • Graceful fallbacks for malformed data

Changed #

• Enhanced stacked bar chart architecture for better JSON integration
• Improved color parsing and validation system
• Better error handling and validation for JSON inputs
• Enhanced documentation and examples for JSON usage

Technical Details #

• Performance: Optimized JSON parsing and chart rendering
• Compatibility: Fully backward compatible with previous versions
• Migration: Easy conversion from existing stacked bar chart implementations

Fixed #

• Dart Analyzer Warnings - Resolved deprecated API usage and code quality issues
  • Fixed deprecated Color.value usage by replacing with Color.toARGB32()
  • Removed unused chartArea variable in bar chart hover handler
  • Applied dart format to improve code readability and consistency
  • Updated pubspec.lock dependencies to latest compatible versions

Changed #

• Code Quality Improvements - Enhanced code maintainability and standards compliance
  • Improved code formatting and consistency across all chart components
  • Enhanced error handling and validation for better stability
  • Updated development dependencies for better tooling support

Technical Details #

• Resolved Issues:
  • warning: unused_local_variable in widgets.dart:200
  • info: deprecated_member_use in models.dart:79
• Performance: No performance impact, only code quality improvements
• Compatibility: Fully backward compatible with previous versions

Added #

• Bar Chart JSON Integration - Comprehensive Plotly-like JSON support for bar charts
• Multiple Factory Constructors - Added fromJson(), fromJsonString(), and fromData() constructors
• Plotly Compatibility - Seamless conversion from Plotly JSON configurations
• Advanced JSON Configuration - Support for complex styling, animations, and layout via JSON
• Color Format Support - Multiple color formats including hex, RGB, and RGBA
• Gradient Effects via JSON - Configure gradient effects and colors through JSON
• Dynamic Data Loading - Load charts from JSON strings or maps with error handling
• Comprehensive Documentation - New dedicated README for JSON integration features

Features #

• JSON Format Support:
  • Simple format for basic charts
  • Plotly-compatible format for existing configurations
  • Advanced format with full customization options
• Factory Constructors:
  • MaterialBarChart.fromJson() - Create from JSON map
  • MaterialBarChart.fromJsonString() - Create from JSON string
  • MaterialBarChart.fromData() - Quick creation from arrays
• Styling via JSON:
  • Colors, animations, and layout configuration
  • Individual bar colors and gradient effects
  • Grid lines, padding, and interactive options
• Migration Support:
  • Easy conversion from Plotly JSON
  • Compatibility mapping and examples
  • Best practices for data transformation

Changed #

• Enhanced bar chart architecture for JSON integration
• Improved error handling and validation for JSON inputs
• Better documentation and examples for JSON usage

Added #

• Tooltip Functionality - Added interactive tooltip support to line charts
• Shared Tooltip Model - Moved tooltip model to shared space for extensibility and reusability
• Enhanced user interaction with detailed data point information

Changed #

• Line Chart Enhancement - Replaced sharp edges with smooth rounded edges for better visual appeal
• Improved line chart rendering with curved line segments
• Enhanced visual aesthetics across all line chart variants
• Tooltip Architecture - Refactored tooltip system for better code organization and maintainability

Features #

• Smooth curved line rendering instead of sharp angular connections
• Better visual flow and modern appearance
• Maintained performance while improving aesthetics
• Interactive tooltips showing data point details on hover
• Reusable tooltip components across different chart types
• Improved code maintainability through shared tooltip models

Added #

• Enhanced documentation and examples
• Improved chart performance optimizations
• Better error handling across all chart types

Changed #

• Updated dependencies to latest stable versions
• Improved code documentation and comments
• Enhanced accessibility features

Fixed #

• Minor bug fixes and stability improvements

Added #

• Comprehensive documentation updates
• Interactive documentation website at materialcharts.netlify.app
• Live editor for visual chart design

Changed #

• Enhanced pie chart center calculation and radius calculation
• Improved chart styling and customization options
• Better responsive design across all chart types

Fixed #

• Pie chart rendering issues
• Chart alignment problems
• Animation performance optimizations

Added #

• Enhanced chart customization options
• Improved animation curves and durations
• Better tooltip implementations

Changed #

• Updated chart styling system
• Improved performance across all chart types
• Enhanced error handling

Added #

• Area Chart - New chart type for quantitative data visualization over continuous intervals
• Enhanced pie chart calculations and rendering
• Improved chart responsiveness

Changed #

• Updated pie chart center calculation algorithm
• Enhanced radius calculation for better accuracy
• Improved chart scaling and positioning

Fixed #

• Pie chart rendering issues on different screen sizes
• Chart alignment problems in various layouts

Added #

• Pie Chart - Interactive pie/donut charts with customizable segments
• Support for both pie and donut chart variants
• Customizable colors, labels, and animations
• Legend support with configurable positioning

Features #

• Animated pie chart segments
• Customizable hole radius for donut charts
• Interactive hover effects
• Configurable label positioning (inside/outside)
• Connector lines for better readability

Added #

• Enhanced candlestick chart features
• Improved financial data visualization
• Better tooltip implementations

Changed #

• Updated candlestick chart styling
• Enhanced chart interactions

Added #

• CandleStick Chart - Financial data visualization for stock market analysis
• Support for OHLC (Open, High, Low, Close) data
• Interactive tooltips with price information
• Scrollable chart view for large datasets
• Customizable colors for bullish/bearish patterns

Features #

• Animated candlestick rendering
• Grid lines and axis labels
• Hover effects with detailed information
• Responsive design for various screen sizes

Added #

• MultiLine Chart - Multiple line series with interactive features
• Support for multiple data series on the same chart
• Interactive legend with series toggling
• Crosshair functionality for precise data point selection
• Zoom and pan capabilities

Features #

• Animated line rendering for each series
• Customizable colors and styles per series
• Grid lines and axis customization
• Tooltip support with series information

Added #

• Gantt Chart - Project timeline visualization with interactive features
• Support for task scheduling and dependencies
• Interactive timeline with date-based navigation
• Connection lines between related tasks
• Customizable task colors and labels

Features #

• Animated timeline rendering
• Date range filtering capabilities
• Task grouping and sorting
• Responsive design for various screen sizes

Added #

• Hollow Semi Circle Chart - Progress indicators in semi-circular format
• Customizable progress visualization
• Animated progress updates
• Configurable colors and styling

Features #

• Smooth progress animations
• Customizable stroke width and colors
• Responsive design

Added #

• Enhanced stacked bar chart features
• Improved chart interactions
• Better performance optimizations

Changed #

• Updated chart styling system
• Enhanced error handling

Added #

• Stacked Bar Chart - Versatile stacked bars for comparative data visualization
• Support for multiple segments per bar
• Interactive hover effects
• Customizable colors and styling

Features #

• Animated stacked bar rendering
• Grid lines and axis labels
• Value labels on segments
• Responsive design

Added #

• Enhanced line chart features
• Improved chart animations
• Better tooltip implementations

Changed #

• Updated line chart styling
• Enhanced chart interactions

Added #

• Line Chart - Animated line charts for trend visualization
• Smooth curve interpolation
• Interactive data point selection
• Customizable grid and axis

Features #

• Animated line rendering
• Grid lines and axis labels
• Hover effects with tooltips
• Responsive design

Added #

• Enhanced bar chart features
• Improved chart interactions
• Better performance optimizations

Changed #

• Updated chart styling system
• Enhanced error handling

Added #

• Bar Chart - Beautiful, interactive bar charts for discrete data visualization
• Animated bar rendering
• Interactive hover effects
• Customizable colors and styling

Features #

• Smooth bar animations
• Grid lines and axis labels
• Value labels on bars
• Responsive design

Added #

• Initial chart framework
• Basic chart styling system
• Animation support

Changed #

• Improved code structure
• Enhanced documentation

Added #

• Chart base classes and interfaces
• Common chart utilities
• Basic styling framework

Added #

• Initial project structure
• Basic Flutter package setup
• Development environment configuration

Added #

• Project initialization
• Basic documentation structure
• License and contribution guidelines

Added #

• Repository setup
• Basic project configuration
• Development tools integration

Added #

• Initial commit structure
• Basic project files
• Development environment setup

Added #

• Project foundation
• Basic file structure
• Development configuration

Added #

• Initial project setup
• Basic documentation
• Development tools

Added #

• Repository initialization
• Basic project structure
• Development environment

Added #

• Project foundation
• Basic configuration
• Development setup

Added #

• Initial release of Material Charts library
• Basic Flutter package structure
• Foundation for chart development
• MIT License
• Basic documentation and README

Features #

• Flutter SDK compatibility
• Material Design aesthetics foundation
• Animation support framework
• Responsive design principles
• Accessibility support structure

Version History Summary #

This changelog covers the development of Material Charts from version 0.0.1 to 0.0.30, documenting the addition of various chart types and features:

• 0.0.1-0.0.11: Foundation and basic framework
• 0.0.12: Bar Chart implementation
• 0.0.14: Line Chart implementation
• 0.0.16: Stacked Bar Chart implementation
• 0.0.18: Hollow Semi Circle Chart implementation
• 0.0.19: Gantt Chart implementation
• 0.0.20: MultiLine Chart implementation
• 0.0.21: CandleStick Chart implementation
• 0.0.23: Pie Chart implementation
• 0.0.24: Area Chart implementation
• 0.0.26-0.0.27: Documentation and performance improvements
• 0.0.29: JSON integration and Plotly compatibility
• 0.0.30: Code quality improvements and bug fixes

Each version builds upon the previous, adding new chart types and enhancing existing functionality with better performance, styling options, and user experience improvements.

Migration Guide #

From 0.0.29 to 0.0.30 #

No breaking changes. This is a maintenance release focused on code quality improvements.

From 0.0.28 to 0.0.29 #

The JSON integration feature is fully backward compatible. Existing code will continue to work without any changes.

From 0.0.27 to 0.0.28 #

The tooltip system has been refactored for better maintainability. Existing tooltip implementations will continue to work.

Contributing #

When contributing to this project, please ensure your changes are documented in this changelog following the established format:

• Use clear, descriptive language
• Group changes by type (Added, Changed, Fixed, Removed)
• Include technical details when relevant
• Maintain chronological order (newest first)
• Follow semantic versioning principles