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_N_GUI_CURVE_MOUSE Struct _N_GUI_GRID Struct _N_GUI_POPUP_ENTRY Struct _N_GUI_POPUP_LEVEL Struct _N_GUI_SB_SKIN Struct _N_GUI_TA_STEP Struct _N_GUI_THUMB Struct _N_GUI_WRAP_ACC Struct _compiled Struct _conn Struct _ip_slot Struct _mp_param Struct _n_civil Struct _seg Struct client Struct collector Struct date_vector Struct md_atom Struct md_cells Struct md_hit Struct md_line_ctx Struct mline Struct n_http_req_header Struct n_http_req_limits Struct n_http_request Struct n_markdown_block Struct n_markdown_doc Struct n_markdown_inline Struct n_markdown_span Struct n_reactor_stats Struct n_url_safe Struct n_url_safe_head Struct n_wrap_item Struct producer_state Struct rects Struct reply Struct runner Struct sink Struct tbuf Struct wrap_hit Struct wrap_span Structures Union COORD_VALUE Union HASH_DATA Union NODE_DATA_TYPES Union STACK_DATA dir_310dcdd4703e877a6b99d5dc3fc54d27 dir_68267d1309a1af8e8297ef4c3efbcdba dir_d28a4824dc47e487b107a5db32ef43c4 dir_d44c64559bbebec7f509842c48db8b23 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ex_base64_8c example ex_clock_sync_8c example ex_common_8c example ex_configfile_8c example ex_cookies_8c example ex_crypto_8c example ex_diff_8c example ex_digest_8c example ex_disk_cache_8c example ex_dns_8c example ex_ecc_8c example ex_entropy_8c example ex_exceptions_8c example ex_file_8c example ex_file_copy_8c example ex_fluid_8c example ex_fluid_config_8c example ex_fluid_config_8h example ex_git_8c example ex_gui_8c example ex_gui_bench_8c example ex_gui_button_keys_8c example ex_gui_checkbox_label_8c example ex_gui_checkbox_release_8c example ex_gui_color_picker_8c example ex_gui_colorwheel_8c example ex_gui_combobox_items_8c example ex_gui_combobox_wheel_8c example ex_gui_cursor_8c example ex_gui_curve_8c example ex_gui_custom_8c example ex_gui_custom_mouse_8c example ex_gui_datagrid_8c example ex_gui_datagrid_keys_8c example ex_gui_datagrid_sort_8c example ex_gui_detach_8c example ex_gui_dictionary_8c example ex_gui_display_fallback_8c example ex_gui_double_click_8c example ex_gui_dropmenu_8c example ex_gui_frameless_drag_8c example ex_gui_global_scroll_8c example ex_gui_glyph_8c example ex_gui_grid_8c example ex_gui_hexview_8c example ex_gui_hover_8c example ex_gui_isometric_8c example ex_gui_kvtable_8c example ex_gui_label_fits_8c example ex_gui_label_lines_8c example ex_gui_layout_persist_8c example ex_gui_listbox_8c example ex_gui_md_8c example ex_gui_multiwin_8c example ex_gui_network_8c example ex_gui_particles_8c example ex_gui_placeholder_8c example ex_gui_popup_8c example ex_gui_progressbar_8c example ex_gui_reentrant_8c example ex_gui_round_8c example ex_gui_sectionlist_8c example ex_gui_slider_default_8c example ex_gui_slider_handle_8c example ex_gui_slider_step_8c example ex_gui_splitpane_8c example ex_gui_suggest_8c example ex_gui_syntaxview_8c example ex_gui_text_shorten_8c example ex_gui_textarea_selection_8c example ex_gui_tooltip_8c example ex_gui_tree_lazy_8c example ex_gui_tree_order_8c example ex_gui_tree_state_8c example ex_gui_window_rect_8c example ex_gui_zorder_8c example ex_hash_8c example ex_hex_8c example ex_html_8c example ex_http2_8c example ex_http2_server_8c example ex_http_cookie_8c example ex_http_form_8c example ex_http_mime_8c example ex_http_req_8c example ex_http_response_8c example ex_http_router_8c example ex_http_server_8c example ex_icc_8c example ex_iso_astar_8c example ex_json_8c example ex_kafka_8c example ex_linalg_8c example ex_list_8c example ex_log_8c example ex_markdown_8c example ex_module_8c example ex_monolith_8c example ex_network_8c example ex_network_8h example ex_network_accept_8c example ex_network_alpn_8c example ex_network_connect_abort_8c example ex_network_mock_8c example ex_network_proxy_8c example ex_network_reactor_8c example ex_network_sni_8c example ex_network_sse_8c example ex_network_ssl_8c example ex_network_ssl_hardened_8c example ex_network_ssl_hostname_8c example ex_network_ssl_nonblock_8c example ex_network_tls_defaults_8c example ex_network_ws_8c example ex_network_ws_limits_8c example ex_nstr_8c example ex_parallel_for_8c example ex_parallel_team_8c example ex_pcre_8c example ex_pretty_8c example ex_pth_8c example ex_query_8c example ex_random_8c example ex_sha256_8c example ex_signals_8c example ex_spawn_8c example ex_ssrf_8c example ex_stack_8c example ex_threads_8c example ex_tiff_8c example ex_time_formats_8c example ex_trajectory_8c example ex_trees_8c example ex_url_8c example ex_url_safe_8c example ex_wrap_8c example ex_x509_8c example ex_zip_8c example ex_zlib_8c example mainpage_8dox n__3d_8c n__3d_8h n__aabb_8c n__aabb_8h n__allegro5_8c n__allegro5_8h n__allegro__4_8c n__allegro__4_8h n__anim_8c n__anim_8h n__astar_8c n__astar_8h n__atlas_8c n__atlas_8h n__avro_8c n__avro_8h n__base64_8c n__base64_8h n__clipboard_8c n__clipboard_8h n__clock__sync_8c n__clock__sync_8h n__common_8c n__common_8h n__config__file_8c n__config__file_8h n__cookies_8c n__cookies_8h n__crypto_8c n__crypto_8h n__dead__reckoning_8c n__dead__reckoning_8h n__diff_8c n__diff_8h n__digest_8c n__digest_8h n__disk__cache_8c n__disk__cache_8h n__dns_8c n__dns_8h n__ecc_8c n__ecc_8h n__entropy_8c n__entropy_8h n__enum_8h n__exceptions_8c n__exceptions_8h n__files_8c n__files_8h n__fluids_8c n__fluids_8h n__games_8c n__games_8h n__git_8c n__git_8h n__gui_8c n__gui_8h n__gui__color_8c n__gui__color_8h n__gui__colorwheel_8c n__gui__colorwheel_8h n__gui__curve_8c n__gui__curve_8h n__gui__grid_8c n__gui__grid_8h n__gui__md_8c n__gui__md_8h n__gui__popup_8c n__gui__popup_8h n__hash_8c n__hash_8h n__hex_8c n__hex_8h n__html_8c n__html_8h n__http2_8c n__http2_8h n__http2__server_8c n__http2__server_8h n__http3_8c n__http3_8h n__http__cookie_8c n__http__cookie_8h n__http__form_8c n__http__form_8h n__http__mime_8c n__http__mime_8h n__http__req_8c n__http__req_8h n__http__response_8c n__http__response_8h n__http__router_8c n__http__router_8h n__http__server_8c n__http__server_8h n__icc_8c n__icc_8h n__iso__engine_8c n__iso__engine_8h n__json_8c n__json_8h n__kafka_8c n__kafka_8h n__linalg_8c n__linalg_8h n__list_8c n__list_8h n__log_8c n__log_8h n__lz4_8c n__lz4_8h n__markdown_8c n__markdown_8h n__module_8c n__module_8h n__network_8c n__network_8h n__network__accept__pool_8c n__network__accept__pool_8h n__network__msg_8c n__network__msg_8h n__nodup__log_8c n__nodup__log_8h n__openssl__compat_8h n__particles_8c n__particles_8h n__pcre_8c n__pcre_8h n__pretty_8c n__pretty_8h n__pth_8c n__pth_8h n__query_8c n__query_8h n__random_8c n__random_8h n__reactor_8c n__reactor_8h n__sha256_8c n__sha256_8h n__signals_8c n__signals_8h n__ssrf_8c n__ssrf_8h n__stack_8c n__stack_8h n__str_8c n__str_8h n__thread__pool_8c n__thread__pool_8h n__tiff_8c n__tiff_8h n__time_8c n__time_8h n__trajectory_8c n__trajectory_8h n__trees_8c n__trees_8h n__url__safe_8c n__url__safe_8h n__user_8c n__user_8h n__windows_8h n__wrap_8c n__wrap_8h n__x509_8c n__x509_8h n__zip_8c n__zip_8h n__zlib_8c n__zlib_8h nilorea_8h
5 Module N_GUI_CURVE
gullradriel edited this page 2026-10-09 00:55:18 +02:00
Table of Contents

GUI CURVE: a curve editor widget

Types

Name
typedef float(*)(const float *xs, const float *ys, int count, float x, void *user_data) N_GUI_CURVE_EVAL
the caller's curve through the points, for drawing.
typedef void(*)(int widget_id, int dragging, void *user_data) N_GUI_CURVE_CHANGE
called on every change of the points.
typedef void(*)(float x, float y, float w, float h, void *user_data) N_GUI_CURVE_BACKGROUND
drawn behind the grid and the curve, such as a histogram.

Functions

Name
int n_gui_curve_set_points(N_GUI_CTX * ctx, int widget_id, const float * xs, const float * ys, int count)
Replace the points.
void n_gui_curve_set_point_radius(N_GUI_CTX * ctx, int widget_id, float radius)
Size of the drawn points, for a display scale.
void n_gui_curve_set_eval(N_GUI_CTX * ctx, int widget_id, N_GUI_CURVE_EVAL eval, void * user_data)
Draw the caller's own curve through the points.
void n_gui_curve_set_background(N_GUI_CTX * ctx, int widget_id, N_GUI_CURVE_BACKGROUND draw, void * user_data)
Draw something behind the grid and the curve.
int n_gui_curve_new(N_GUI_CTX * ctx, int window_id, float x, float y, float w, float h, int max_points, N_GUI_CURVE_CHANGE on_change, void * user_data)
Add a curve editor to a window.
int n_gui_curve_get_points(N_GUI_CTX * ctx, int widget_id, float * xs, float * ys, int max)
Read the points.
float n_gui_curve_eval_points(const float * xs, const float * ys, int count, float x)
A monotone cubic Hermite spline through points.
float n_gui_curve_eval(N_GUI_CTX * ctx, int widget_id, float x)
The editor's curve at x, as it is drawn.

Types Documentation

typedef N_GUI_CURVE_EVAL

typedef float(* N_GUI_CURVE_EVAL) (const float *xs, const float *ys, int count, float x, void *user_data);

the caller's curve through the points, for drawing.

Parameters:

  • xs the points' x, ascending, in [0,1]
  • ys the points' y, in [0,1]
  • count how many points, at least 2
  • x where to evaluate, in [0,1]
  • user_data what was handed to n_gui_curve_set_eval()

Return: the curve's value at x

typedef N_GUI_CURVE_CHANGE

typedef void(* N_GUI_CURVE_CHANGE) (int widget_id, int dragging, void *user_data);

called on every change of the points.

Parameters:

  • widget_id the editor
  • dragging 1 while the change is a step of a drag of one point, 0 for a point added or removed
  • user_data what was handed to n_gui_curve_new()

typedef N_GUI_CURVE_BACKGROUND

typedef void(* N_GUI_CURVE_BACKGROUND) (float x, float y, float w, float h, void *user_data);

drawn behind the grid and the curve, such as a histogram.

Parameters:

Functions Documentation

function n_gui_curve_set_points

int n_gui_curve_set_points(
    N_GUI_CTX * ctx,
    int widget_id,
    const float * xs,
    const float * ys,
    int count
)

Replace the points.

Parameters:

  • ctx the GUI context.
  • widget_id the editor.
  • xs the points' x. Must not be NULL.
  • ys the points' y. Must not be NULL.
  • count how many, 2 to the editor's maximum.

Return: TRUE, or FALSE when refused or on a bad argument.

on_change is not called.

Refused while a point is being dragged, so a model echoing a change back cannot pull the point from under the pointer. The points are sorted by x and clamped to [0,1].

function n_gui_curve_set_point_radius

void n_gui_curve_set_point_radius(
    N_GUI_CTX * ctx,
    int widget_id,
    float radius
)

Size of the drawn points, for a display scale.

Parameters:

  • ctx the GUI context.
  • widget_id the editor.
  • radius in pixels, 4 by default. Zero or less is ignored.

A press within two and a half radii of a point takes it.

function n_gui_curve_set_eval

void n_gui_curve_set_eval(
    N_GUI_CTX * ctx,
    int widget_id,
    N_GUI_CURVE_EVAL eval,
    void * user_data
)

Draw the caller's own curve through the points.

Parameters:

  • ctx the GUI context.
  • widget_id the editor.
  • eval the caller's curve; NULL goes back to n_gui_curve_eval_points().
  • user_data handed back to eval.

function n_gui_curve_set_background

void n_gui_curve_set_background(
    N_GUI_CTX * ctx,
    int widget_id,
    N_GUI_CURVE_BACKGROUND draw,
    void * user_data
)

Draw something behind the grid and the curve.

Parameters:

  • ctx the GUI context.
  • widget_id the editor.
  • draw the callback; NULL draws nothing there.
  • user_data handed back to draw.

function n_gui_curve_new

int n_gui_curve_new(
    N_GUI_CTX * ctx,
    int window_id,
    float x,
    float y,
    float w,
    float h,
    int max_points,
    N_GUI_CURVE_CHANGE on_change,
    void * user_data
)

Add a curve editor to a window.

Parameters:

  • ctx the GUI context. Must not be NULL.
  • window_id the window to add it to.
  • x left, relative to the window.
  • y top, relative to the window.
  • w width.
  • h height.
  • max_points how many points it may hold, 2 or more.
  • on_change called on every change. May be NULL.
  • user_data handed back to on_change.

Return: the widget id, or -1 on error. The editor's state is the widget's and is freed with it.

It starts as the identity, two points at (0,0) and (1,1).

function n_gui_curve_get_points

int n_gui_curve_get_points(
    N_GUI_CTX * ctx,
    int widget_id,
    float * xs,
    float * ys,
    int max
)

Read the points.

Parameters:

  • ctx the GUI context.
  • widget_id the editor.
  • xs receives up to max x, ascending. May be NULL to count only.
  • ys receives up to max y. May be NULL to count only.
  • max room in xs and ys.

Return: how many points the editor holds, or -1 when it is not an editor.

function n_gui_curve_eval_points

float n_gui_curve_eval_points(
    const float * xs,
    const float * ys,
    int count,
    float x
)

A monotone cubic Hermite spline through points.

Parameters:

  • xs the points' x, ascending. Must not be NULL.
  • ys the points' y. Must not be NULL.
  • count how many. 0 gives x, 1 gives that point's y.
  • x where, clamped to [0,1].

Return: the value.

The tangents are the averaged secant slopes, zeroed at a local extremum and limited to three times the segment's slope (Fritsch-Carlson), so a segment never overshoots its end points. Outside the points the curve holds the end value. The result is clamped to [0,1].

function n_gui_curve_eval

float n_gui_curve_eval(
    N_GUI_CTX * ctx,
    int widget_id,
    float x
)

The editor's curve at x, as it is drawn.

Parameters:

  • ctx the GUI context.
  • widget_id the editor.
  • x where, clamped to [0,1].

Return: the value, or x when widget_id is not an editor.

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