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/* SPDX-License-Identifier: MIT */
/*
* kon2d.h
*
* Copyright (c) 2026 KonAki
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef KON2D_H
#define KON2D_H
#include "konsofren.h"
/*** camera ***/
/* x, y is the map pixel at the top left of the view. bounds is the size of the map in pixels, the view never leaves it
(and a map smaller than the view is centred) */
typedef struct kon_camera2 {
float x, y;
int viewWidth, viewHeight;
float boundsWidth, boundsHeight;
float stiffness; /* how quickly it catches up, around 6 to 12 feels right, 0 or less follows exactly */
} kon_camera2_t;
void kon_camera2Init(kon_camera2_t *cam, int viewWidth, int viewHeight, float boundsWidth, float boundsHeight);
/* puts the target in the middle of the view at once */
void kon_camera2Snap(kon_camera2_t *cam, float targetX, float targetY);
/* eases towards having the target in the middle */
void kon_camera2Follow(kon_camera2_t *cam, float targetX, float targetY, float dt);
/* whole pixels, what to pass to kon_drawTilemap so nothing shimmers */
int kon_camera2X(const kon_camera2_t *cam);
int kon_camera2Y(const kon_camera2_t *cam);
/*** animation ***/
/* plays count frames starting at frame first of a sheet at fps frames a second */
typedef struct kon_anim {
int first, count;
float fps;
int loop;
float time;
} kon_anim_t;
/* starts over, unless it is already playing the same thing */
void kon_animPlay(kon_anim_t *anim, int first, int count, float fps, int loop);
void kon_animStep(kon_anim_t *anim, float dt);
/* the frame to draw, the last one when a non looping animation has finished */
int kon_animFrame(const kon_anim_t *anim);
int kon_animDone(const kon_anim_t *anim);
/* draws frame index of a sheet of frameWidth by frameHeight frames with its top left at x, y */
void kon_drawFrame(kon_framebuffer_t *fb, const kon_image *sheet, int frameWidth, int frameHeight, int index, int x, int y, int flip);
/*** tweens ***/
typedef enum kon_ease {
KON_EASE_LINEAR,
KON_EASE_IN, /* starts slow */
KON_EASE_OUT, /* ends slow */
KON_EASE_INOUT
} kon_ease_t;
/* a number that glides from one value to another. start one with kon_tweenStart, feed it time with kon_tweenStep and read it with
kon_tweenValue. a tween that was never started just holds 0, kon_tweenSet gives it a value to hold */
typedef struct kon_tween {
float from, to;
float duration, time;
kon_ease_t ease;
} kon_tween_t;
/* t from 0 to 1, out of range is clamped */
float kon_easeValue(kon_ease_t ease, float t);
void kon_tweenSet(kon_tween_t *tween, float value);
void kon_tweenStart(kon_tween_t *tween, float from, float to, float seconds, kon_ease_t ease);
/* glides from wherever it is now, so it can be redirected in the middle of a move */
void kon_tweenTo(kon_tween_t *tween, float to, float seconds, kon_ease_t ease);
/* returns the new value */
float kon_tweenStep(kon_tween_t *tween, float dt);
float kon_tweenValue(const kon_tween_t *tween);
int kon_tweenDone(const kon_tween_t *tween);
#endif
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