Modules

2D plot operations module

3D plot operations module

Coordinate transformation functions for text annotations

Annotation rendering dispatch system for fortplot

Text annotation system for fortplot (Issue #55)

ASCII terminal plotting backend - Backend Operations

ASCII terminal plotting backend - Basic Drawing Elements

ASCII terminal plotting backend - Legend Management

Plays back ASCII animations produced by save_animation(*.txt).

ASCII terminal plotting backend - Core Rendering Logic

ASCII terminal plotting backend - Text and Layout Management

ASCII terminal plotting backend - Utility Functions

Date axis handling module

Color space conversions and colormap functionality

Core color parsing functionality for matplotlib-compatible color syntax

Color parsing and management for matplotlib-compatible color syntax

Abstract base class for plotting backends

Default contour level generation compatible with matplotlib MaxNLocator

Contour plot rendering module

Input validation for coordinate arrays and edge case handling

Output generation for documentation markdown files.

Error bar plot operations module

Error handling module for fortplot library Provides centralized error management with status codes and messages

Accessor functions for figure_t

Helper routines for enforcing axis aspect ratios in figures

Stateful colorbar rendering (matplotlib-style).

Fortran requires all procedure :: and generic :: type-bound procedure interfaces to be declared in the same module as the type definition. The ~175 lines of type definition + ~642 lines of explicit interface blocks cannot be split without a major architectural refactor (submodule interface modules or facade pattern). Implementations are already split across the submodules listed in the imports above. See issue #1925.

Advanced plotting operations extracted from fortplot_figure_core

Figure I/O and rendering operations module

Core operations implementations extracted from fortplot_figure_core

Utility operations extracted from fortplot_figure_core

Specialized plot-type range processors Extracted from fortplot_figure_data_ranges for size compliance (refs #1694)

Grid-based plot data registration (contour, surface, pcolormesh) Extracted from fortplot_figure_plot_management for size compliance (refs #1694)

Figure initialization module

Figure legend setup module Extracted from fortplot_figure_plot_management for size compliance (refs #1694)

Figure core operations module for fortplot_figure_core

Plot rendering dispatch module

Individual plot type rendering procedures

Figure property management module for fortplot_figure_core

Figure data range management functionality Extracted from fortplot_figure_core.f90 for size reduction (SRP compliance)

Shared rendering engine for figure outputs.

Figure rendering pipeline module

Figure streamline functionality module

Utility functions for figure operations

Separate positioning for tick labels vs axis labels Follows matplotlib exact spacing measurements

Layout and margin calculations for plotting backends

Legend drawing and rendering procedures

Legend state and factory functions

Line pattern and style rendering algorithms

Common margin and axis functionality for plotting backends

Shared marker utilities following DRY principles Eliminates code duplication between PNG and PDF backends

Matplotlib-compatible API wrapper for fortplot Main facade module that re-exports all matplotlib-style functions

Axes, scale, and labelling helpers for the matplotlib facade

Matplotlib-style stateful colorbar wrapper.

Contour visualisation wrappers for matplotlib facade

Pcolormesh and surface visualisation wrappers for matplotlib facade

Matplotlib-compatible plot functions for imshow/pie/polar/step/stem/fill.

Internal dispatch layer for matplotlib-compatible scatter plots.

Global figure session helpers shared across matplotlib-compatible wrappers

Mesh (pcolormesh) rendering module

Pcolormesh (pseudocolor mesh) plotting functionality

PDF axes, grid, tick drawing, and plot frame operations

PDF axis text rendering module

PDF coordinate transformation and polymorphic method support Handles coordinate normalization and backend-specific method implementations

PDF-specific drawing utility functions

PDF marker and graphics state operations Handles marker drawing, color management, and graphics state operations

PDF object writers for document structure elements

Low-level PDF stream writing utilities

PDF text measurement helpers

Mixed-font PDF text segmentation helpers

Bar chart plotting functionality

Core plot data structures - extracted from fortplot_figure_core

Advanced plotting methods (contour, bar, histogram, boxplot, streamplot)

Polar coordinate transformation and utilities

Polar rendering helper procedures

Main raster plotting context - type definition and constructor only. All bound method implementations are in submodules: fortplot_raster_impl - drawing methods (line, arrow, marker, quad) fortplot_raster_text_impl - text rendering methods (text, bbox, rotated)

Custom tick label and axis label wrapper procedures for raster backend Extracted from fortplot_raster_axes to maintain file size compliance

Core raster image management and basic operations Extracted from fortplot_raster.f90 for size reduction (SRP compliance)

Raster axis labels (title, xlabel, ylabel) rendering functionality Extracted from fortplot_raster_axes.f90 for single responsibility principle

Raster marker drawing functions

Specialized rendering functionality for raster backend Extracted from fortplot_raster.f90 for size reduction (SRP compliance)

Raster tick marks and tick labels rendering functionality (primary axes) Extracted from fortplot_raster_axes.f90 for single responsibility principle

Figure rendering pipeline orchestrator module

Scatter plot operations module

Applies config_t values to figure_state_t for rendering.

Built-in style presets for MPL and Vega-Lite rendering modes.

JSON parser for the Vega-Lite config block and related top-level properties (padding, autosize).

Vega-Lite config types for style theming.

Convert figure_t into a proper spec_t with marks, encodings, data columns, and config -- no scene_t wrapper.

JSON channel, scale, domain, and axis parsing.

JSON serialization helpers for field_plot_t

Low-level JSON token readers and I/O utilities.

Native render path for spec_t values.

Vega-Lite-shaped specification types for fortplot

DOPRI5 (Dormand-Prince 5(4)) integrator for streamline computation Provides adaptive step size control and high-order accuracy

Shared utilities for streamplot arrow placement

Matplotlib-inspired streamplot implementation.

Surface rendering module for 3D surface plots

Standalone SVG axes and label rendering

Standalone SVG legend rendering and layout

System viewer launching for show() functionality Handles platform-specific viewer launching and graphical session detection

Utilities for directing test artifact output into structured directories

PDF stream extraction utilities for testing

Main text module that provides backend-agnostic font and layout services

Small helpers for preparing text for backends

Thin facade module that re-exports shared layout utilities and raster hooks

Core tick calculation algorithms for linear scales

Specialized tick generation for logarithmic and symmetric logarithmic scales

Pure Fortran TrueType font parser and rasterizer. Based on stb_truetype.h v1.26 by Sean Barrett. Original C implementation rewritten in Fortran for the fortplot project.

TrueType cmap (character map) table parser. Maps Unicode codepoints to glyph indices, supporting formats 0, 4, 6, 12, and 13.

TrueType edge sorting utilities. Sorts glyph outline edges by y0 for scanline rasterization.

TrueType glyph outline extraction. Parses the glyf table to extract vertex data (moves, lines, quadratic bezier curves) for simple and composite glyphs. Fortran port of stbtt__GetGlyphShapeTT from stb_truetype.h lines 1658-1895.

Scanline coverage helpers for the TrueType analytical antialias rasterizer. Split from fortplot_tt_rasterizer to keep that module under the size limit.

Twin axes label rendering for raster, PDF, and ASCII backends Extracted from fortplot_figure_rendering_pipeline for size compliance (Issue #1747)

Utility functions module for common operations

Vector plot (quiver, streamplot, refline) rendering helpers

CRC32 and Adler-32 checksum calculations for zlib.

Re-export facade for zlib compress and decompress modules.