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/* SPDX-License-Identifier: MIT */
/*
* kon2d.c
*
* 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.
*/
#include "kon2d.h"
#include <math.h>
/*** camera ***/
static float clampAxis(float value, float view, float bounds)
{
if (bounds <= view) return (bounds - view) * 0.5f;
if (value < 0.0f) return 0.0f;
if (value > bounds - view) return bounds - view;
return value;
}
void kon_camera2Init(kon_camera2_t *cam, int viewWidth, int viewHeight, float boundsWidth, float boundsHeight)
{
cam->x = cam->y = 0.0f;
cam->viewWidth = viewWidth;
cam->viewHeight = viewHeight;
cam->boundsWidth = boundsWidth;
cam->boundsHeight = boundsHeight;
cam->stiffness = 8.0f;
cam->x = clampAxis(0.0f, (float)viewWidth, boundsWidth);
cam->y = clampAxis(0.0f, (float)viewHeight, boundsHeight);
}
void kon_camera2Snap(kon_camera2_t *cam, float targetX, float targetY)
{
cam->x = clampAxis(targetX - (float)cam->viewWidth * 0.5f, (float)cam->viewWidth, cam->boundsWidth);
cam->y = clampAxis(targetY - (float)cam->viewHeight * 0.5f, (float)cam->viewHeight, cam->boundsHeight);
}
void kon_camera2Follow(kon_camera2_t *cam, float targetX, float targetY, float dt)
{
float wantX = clampAxis(targetX - (float)cam->viewWidth * 0.5f, (float)cam->viewWidth, cam->boundsWidth);
float wantY = clampAxis(targetY - (float)cam->viewHeight * 0.5f, (float)cam->viewHeight, cam->boundsHeight);
float ease = 1.0f;
if (cam->stiffness > 0.0f && dt > 0.0f) ease = 1.0f - expf(-cam->stiffness * dt);
cam->x += (wantX - cam->x) * ease;
cam->y += (wantY - cam->y) * ease;
}
int kon_camera2X(const kon_camera2_t *cam)
{
return (int)floorf(cam->x + 0.5f);
}
int kon_camera2Y(const kon_camera2_t *cam)
{
return (int)floorf(cam->y + 0.5f);
}
/*** animation ***/
void kon_animPlay(kon_anim_t *anim, int first, int count, float fps, int loop)
{
if (anim->first == first && anim->count == count && anim->fps == fps && anim->loop == loop) return;
anim->first = first;
anim->count = count;
anim->fps = fps;
anim->loop = loop;
anim->time = 0.0f;
}
void kon_animStep(kon_anim_t *anim, float dt)
{
if (anim->count <= 0 || !(dt > 0.0f)) return;
anim->time += dt;
if (anim->loop) {
float length = (float)anim->count / anim->fps;
if (anim->fps > 0.0f && anim->time >= length) anim->time = fmodf(anim->time, length);
}
}
int kon_animFrame(const kon_anim_t *anim)
{
int n;
if (anim->count <= 0) return anim->first;
if (!(anim->fps > 0.0f)) return anim->first;
n = (int)(anim->time * anim->fps);
if (n >= anim->count) n = anim->loop ? n % anim->count : anim->count - 1;
return anim->first + n;
}
int kon_animDone(const kon_anim_t *anim)
{
if (anim->loop || anim->count <= 0) return 0;
return anim->fps > 0.0f && (int)(anim->time * anim->fps) >= anim->count;
}
void kon_drawFrame(kon_framebuffer_t *fb, const kon_image *sheet, int frameWidth, int frameHeight, int index, int x, int y, int flip)
{
kon_rect_t src = kon_frameRect(sheet, frameWidth, frameHeight, index);
if (src.w <= 0) return;
if (!flip) {
kon_drawImageRegion(fb, x, y, sheet, src);
return;
}
kon_drawImageEx(fb, sheet, src, (float)x + (float)frameWidth * 0.5f, (float)y + (float)frameHeight * 0.5f,
(float)frameWidth * 0.5f, (float)frameHeight * 0.5f, -1.0f, 1.0f, 0.0f, KON_FILTER_NEAREST);
}
/*** tweens ***/
float kon_easeValue(kon_ease_t ease, float t)
{
if (!(t > 0.0f)) return 0.0f;
if (t >= 1.0f) return 1.0f;
switch (ease) {
case KON_EASE_IN: return t * t * t;
case KON_EASE_OUT: return 1.0f - (1.0f - t) * (1.0f - t) * (1.0f - t);
case KON_EASE_INOUT: return t < 0.5f ? 4.0f * t * t * t : 1.0f - 4.0f * (1.0f - t) * (1.0f - t) * (1.0f - t);
case KON_EASE_LINEAR: break;
}
return t;
}
void kon_tweenSet(kon_tween_t *tween, float value)
{
tween->from = tween->to = value;
tween->duration = tween->time = 0.0f;
tween->ease = KON_EASE_LINEAR;
}
void kon_tweenStart(kon_tween_t *tween, float from, float to, float seconds, kon_ease_t ease)
{
tween->from = from;
tween->to = to;
tween->ease = ease;
tween->time = 0.0f;
tween->duration = seconds > 0.0f ? seconds : 0.0f;
}
void kon_tweenTo(kon_tween_t *tween, float to, float seconds, kon_ease_t ease)
{
kon_tweenStart(tween, kon_tweenValue(tween), to, seconds, ease);
}
float kon_tweenStep(kon_tween_t *tween, float dt)
{
if (dt > 0.0f && tween->time < tween->duration) {
tween->time += dt;
if (tween->time > tween->duration) tween->time = tween->duration;
}
return kon_tweenValue(tween);
}
float kon_tweenValue(const kon_tween_t *tween)
{
if (!(tween->duration > 0.0f)) return tween->to;
return tween->from + (tween->to - tween->from) * kon_easeValue(tween->ease, tween->time / tween->duration);
}
int kon_tweenDone(const kon_tween_t *tween)
{
return tween->time >= tween->duration;
}
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