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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__colorwheel_8h
gullradriel edited this page 2026-10-09 00:55:18 +02:00
Table of Contents

include/nilorea/n_gui_colorwheel.h

A colour wheel for N_GUI: one point in a disc, dragged. More...

Detailed Description

A colour wheel for N_GUI: one point in a disc, dragged.

Author: Castagnier Mickael

Version: 1.0

Date: 28/09/2026

A disc whose point, u across and v up, both -1 to 1 and never outside the unit circle, is set by pressing and dragging with the left button; a right press or a double click puts it back in the centre, the double click timed as the context times it (n_gui_set_double_click_time()). What the point means is the caller's: a hue and a strength, a shift on two colour axes, a direction. So is what the disc shows: n_gui_colorwheel_set_colour() paints each place of it with the caller's colour for that point, so the wheel shows what choosing it does. By default the disc is an HSV hue circle, saturated at the rim and grey in the centre.

The widget is a custom one (n_gui_add_custom() with n_gui_custom_set_mouse()), so it lives in any window and its state is freed with it. on_change is called on every change, with dragging set while the button is held.

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_COLORWHEEL__
#define __NILOREA_GUI_COLORWHEEL__

/* Allegro only: the wheel 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_COLORWHEEL_CHANGE)(int widget_id, int dragging, void* user_data);

typedef ALLEGRO_COLOR (*N_GUI_COLORWHEEL_COLOUR)(float u, float v, void* user_data);

int n_gui_colorwheel_new(N_GUI_CTX* ctx, int window_id, float x, float y, float w, float h, N_GUI_COLORWHEEL_CHANGE on_change, void* user_data);

int n_gui_colorwheel_set(N_GUI_CTX* ctx, int widget_id, float u, float v);

int n_gui_colorwheel_get(N_GUI_CTX* ctx, int widget_id, float* u, float* v);

void n_gui_colorwheel_set_colour(N_GUI_CTX* ctx, int widget_id, N_GUI_COLORWHEEL_COLOUR colour, void* user_data);

ALLEGRO_COLOR n_gui_colorwheel_hue(float u, float v, void* user_data);


#ifdef __cplusplus
}
#endif

#endif /* HAVE_ALLEGRO */

#endif /* __NILOREA_GUI_COLORWHEEL__ */

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