123 lines
4.0 KiB
C
123 lines
4.0 KiB
C
/* source/widgets/sgl_2dball.c
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*
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* MIT License
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*
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* Copyright(c) 2023-present All contributors of SGL
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* Document reference link: https://sgl-docs.readthedocs.io
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <sgl_core.h>
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#include <sgl_draw.h>
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#include <sgl_math.h>
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#include <sgl_log.h>
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#include <sgl_mm.h>
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#include <sgl_theme.h>
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#include <sgl_cfgfix.h>
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#include <string.h>
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#include "sgl_2dball.h"
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static void sgl_2dball_construct_cb(sgl_surf_t *surf, sgl_obj_t* obj, sgl_event_t *evt)
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{
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sgl_2dball_t *ball = sgl_container_of(obj, sgl_2dball_t, obj);
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int16_t cx = 0, cy = 0;
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if(evt->type == SGL_EVENT_DRAW_MAIN) {
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sgl_area_t clip;
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sgl_color_t *buf = NULL, *blend = NULL;
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cx = (ball->obj.coords.x1 + ball->obj.coords.x2) / 2;
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cy = (ball->obj.coords.y1 + ball->obj.coords.y2) / 2;
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if (!sgl_surf_clip(surf, &obj->area, &clip)) {
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return;
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}
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sgl_area_t c_rect = {
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.x1 = cx - obj->radius,
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.x2 = cx + obj->radius,
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.y1 = cy - obj->radius,
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.y2 = cy + obj->radius
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};
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if (!sgl_area_selfclip(&clip, &c_rect)) {
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return;
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}
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int y2 = 0, real_r2 = 0, edge_alpha = 0;
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int r2 = sgl_pow2(obj->radius);
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int r2_edge = sgl_pow2(obj->radius + 1);
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int ds_alpha = SGL_ALPHA_MIN;
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buf = sgl_surf_get_buf(surf, clip.x1 - surf->x1, clip.y1 - surf->y1);
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for (int y = clip.y1; y <= clip.y2; y++) {
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y2 = sgl_pow2(y - cy);
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blend = buf;
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for (int x = clip.x1; x <= clip.x2; x++, blend++) {
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real_r2 = sgl_pow2(x - cx) + y2;
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ds_alpha = real_r2 * SGL_ALPHA_NUM / r2;
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if (real_r2 >= r2_edge) {
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if(x > cx)
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break;
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continue;
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}
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else if (real_r2 >= r2) {
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edge_alpha = SGL_ALPHA_MAX - sgl_sqrt_error(real_r2);
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sgl_color_t color_mix = sgl_color_mixer(ball->bg_color, *blend, edge_alpha);
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*blend = sgl_color_mixer(color_mix, *blend, ball->alpha);
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}
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else {
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*blend = sgl_color_mixer(sgl_color_mixer(ball->bg_color, ball->color, ds_alpha), *blend, ball->alpha);
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}
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}
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buf += surf->w;
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}
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}
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}
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/**
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* @brief create a 2dball object
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* @param parent parent of the 2dball
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* @return 2dball object
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*/
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sgl_obj_t* sgl_2dball_create(sgl_obj_t* parent)
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{
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sgl_2dball_t *ball = sgl_malloc(sizeof(sgl_2dball_t));
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if(ball == NULL) {
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SGL_LOG_ERROR("sgl_2dball_create: malloc failed");
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return NULL;
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}
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/* set object all member to zero */
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memset(ball, 0, sizeof(sgl_2dball_t));
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sgl_obj_t *obj = &ball->obj;
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sgl_obj_init(&ball->obj, parent);
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obj->construct_fn = sgl_2dball_construct_cb;
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obj->needinit = 1;
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ball->alpha = SGL_ALPHA_MAX;
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ball->color = SGL_THEME_COLOR;
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ball->bg_color = SGL_THEME_BG_COLOR;
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return obj;
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}
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