n_gui_curve.h

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/*
 * 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__ */