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H2_STREAM Struct HASH_NODE Struct HASH_TABLE Struct ISO_DRAW_ENTRY Struct ISO_MAP Struct ISO_PROJECTION Struct ISO_TILE_SEGMENT Struct ISO_TILE_SEGMENTS Struct ISO_VISIBLE_EDGES Struct JS_STATE Struct LEX_ITEM Struct LIST Struct LIST_NODE Struct LOG_LEVELS Struct LexMenu Struct MEMBER Struct MIDI Struct NESTED Struct NETWORK Struct NETWORK_HTTP_INFO Struct NETWORK_POOL Struct NETWORK_SSL_THREAD_PARAMS Struct NETW_ACCEPT_POOL Struct NETW_ACCEPT_POOL_STATS Struct NETW_MSG Struct NETW_SNI_ARG Struct NODE_DATA Struct N_ATLAS Struct N_ATLAS_PAGE Struct N_CLOCK_SYNC Struct N_COOKIE Struct N_COOKIE_JAR Struct N_DIFF_LINE Struct N_DIFF_RESULT Struct N_DISK_CACHE Struct N_ENTROPY_BIT Struct N_ENTROPY_POS Struct N_FILE_INFO Struct N_FLUID Struct N_FLUID_THREAD_PARAMS Struct N_FORM_FIELD Struct N_GIT_COMMIT_INFO Struct N_GIT_REMOTE_AUTH Struct N_GIT_REPO Struct N_GIT_STATUS_ENTRY Struct N_GUI_BUTTON_DATA Struct N_GUI_CHECKBOX_DATA Struct N_GUI_COLOR_PICKER Struct N_GUI_COMBOBOX_DATA Struct N_GUI_CTX Struct N_GUI_CUSTOM_DATA Struct N_GUI_DATAGRID_COL Struct N_GUI_DATAGRID_DATA Struct N_GUI_DROPMENU_DATA Struct N_GUI_DROPMENU_ENTRY Struct N_GUI_GRID_CALLBACKS Struct N_GUI_HEXVIEW_DATA Struct N_GUI_IMAGE_DATA Struct N_GUI_KVTABLE Struct N_GUI_KV_CONTENT Struct N_GUI_KV_ROW Struct N_GUI_LABEL_DATA Struct N_GUI_LISTBOX_DATA Struct N_GUI_LISTITEM Struct N_GUI_MARKDOWNVIEW_DATA Struct N_GUI_MD_FONTS Struct N_GUI_MD_STYLE Struct N_GUI_MEAS_ENTRY Struct N_GUI_MOUSE_EVENT Struct N_GUI_PENDING_GEOM Struct N_GUI_PENDING_WIDGET Struct N_GUI_POPUP Struct N_GUI_PROGRESSBAR_DATA Struct N_GUI_RADIOLIST_DATA Struct N_GUI_SB_TRACK Struct N_GUI_SCROLLBAR_DATA Struct N_GUI_SECTION Struct N_GUI_SECTIONLIST Struct N_GUI_SLIDER_DATA Struct N_GUI_SPLITPANE_DATA Struct N_GUI_STYLE Struct N_GUI_SUGGEST_SINK Struct N_GUI_SYNTAXVIEW_DATA Struct N_GUI_TAB_PANEL Struct N_GUI_TB_BUTTONS Struct N_GUI_TEXTAREA_DATA Struct N_GUI_TEXT_DIMS Struct N_GUI_THEME Struct N_GUI_TREE Struct N_GUI_TREE_NODE Struct N_GUI_TREE_STATE Struct N_GUI_WIDGET Struct N_GUI_WINDOW Struct N_H2_FRAME Struct N_H2_HEADER Struct N_H2_HPACK Struct N_H2_REQUEST Struct N_H2_SERVER Struct N_H2_SETTING Struct N_HTML_ATTR_ Struct N_HTML_FORM Struct N_HTML_TAG_ Struct N_HTTP3_RESPONSE Struct N_HTTP_FIELD Struct N_HTTP_FORM Struct N_HTTP_FORM_MULTIPART Struct N_HTTP_FORM_PART Struct N_HTTP_MULTIPART_PART Struct N_HTTP_REQUEST Struct N_HTTP_RESP Struct N_HTTP_RESPONSE Struct N_HTTP_SERVER Struct N_HTTP_SERVER_CONFIG Struct N_HTTP_SERVER_REQUEST Struct N_HTTP_SERVER_STATS Struct N_HTTP_SET_COOKIE Struct N_HTTP_STREAM Struct N_ISO_CAMERA Struct N_ISO_OBJECT Struct N_KAFKA Struct N_KAFKA_EVENT Struct N_MOCK_SERVER Struct N_MODULE Struct N_PARALLEL_SLICE Struct N_PARALLEL_TEAM Struct N_PARALLEL_WORKER Struct N_PCRE Struct N_PROXY_CFG Struct N_PTH Struct N_PTH_TENSOR Struct N_QUERY Struct N_ROUTE Struct N_ROUTER Struct N_ROUTE_MATCH Struct N_SHA256 Struct N_SOCKET Struct N_SPAWN_PIPE Struct N_SSE_CONN Struct N_SSE_EVENT Struct N_STR Struct N_TIFF Struct N_TIFF_ENTRY Struct N_TIME Struct N_URL Struct N_URL_PARAM Struct N_USER Struct N_USERLIST Struct N_WS_CONN Struct N_WS_FRAME Struct N_WS_MESSAGE Struct N_ZIP_MEMBER Struct OCTREE Struct OCTREE_NODE Struct PARSER Struct PARTICLE Struct PARTICLE_EMITTER Struct PARTICLE_SYSTEM Struct PEER Struct PHYSICS Struct PK_OBJ Struct PK_VM Struct POINT2D Struct POINT3D Struct PRETTY_OUT Struct QNODE Struct QUADTREE Struct QUADTREE_NODE Struct REC Struct RGB Struct SAMPLE Struct SEEN Struct SHARER Struct SRV Struct SRV_ARG Struct STACK Struct STACK_ITEM Struct SYNTAX_RUN Struct THREAD_POOL Struct THREAD_POOL_NODE Struct THREAD_WAITING_PROC Struct TRAJECTORY Struct TRAJECTORY_POINT Struct TREE Struct TREE_NODE Struct TS_LOG Struct WAYPOINT3D Struct WORKER_ARG Struct ZIP_SINK Struct _N_DC_ENTRY Struct _N_DC_GROUP_ENTRY Struct _N_GUI_COLORWHEEL Struct _N_GUI_COLORWHEEL_BLOCK Struct _N_GUI_COLORWHEEL_MOUSE Struct _N_GUI_CURVE Struct _N_GUI_CURVE_BLOCK Struct _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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6 n__gui__curve_8h
gullradriel edited this page 2026-10-09 00:55:18 +02:00
Table of Contents

include/nilorea/n_gui_curve.h

A curve editor for N_GUI: control points on a curve over [0,1]. More...

Detailed Description

A curve editor for N_GUI: control points on a curve over [0,1].

Author: Castagnier Mickael

Version: 1.0

Date: 24/09/2026

A tone curve, an easing curve, a gain curve: a function from [0,1] to [0,1] shaped by dragging points. The editor is a custom widget (n_gui_add_custom() with n_gui_custom_set_mouse()), so it lives in any window like any other widget and its state is freed with it.

  • A left press on a point takes it; anywhere else adds a point there and takes that. Dragging moves the taken point: its y anywhere in [0,1], its x between its neighbours, and never the x of the first or the last point, so the curve's domain stays whole.
  • A right press on a point removes it, unless it is the first or the last.
  • on_change is called on every change, with dragging set while the change is a step of a drag, so a caller can make one undo step of a whole drag.

The points are the caller's data as much as the widget's: set them from the model, read them back in on_change. What the curve between them is, is the caller's too: n_gui_curve_set_eval() draws the caller's own interpolation, so what is drawn is exactly what the caller computes. By default it is n_gui_curve_eval_points(), a monotone cubic Hermite spline that holds its end values outside the points and never overshoots them.

Colours come from the widget's theme: bg_normal under everything, border_normal for the frame, the quarter grid and the diagonal, text_normal for the curve and the points.

Source code

/*
 * Nilorea Library
 * Copyright (C) 2005-2026 Castagnier Mickael
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */


#ifndef __NILOREA_GUI_CURVE__
#define __NILOREA_GUI_CURVE__

/* Allegro only: the editor is an N_GUI widget drawn with allegro_primitives. */
#ifdef HAVE_ALLEGRO

#ifdef __cplusplus
extern "C" {
#endif


#include "nilorea/n_gui.h"

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

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

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

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);

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

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

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

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

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

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

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


#ifdef __cplusplus
}
#endif
#endif /* HAVE_ALLEGRO */
#endif /* __NILOREA_GUI_CURVE__ */

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