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Import of the watch repository from Pebble

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Matthieu Jeanson 2024-12-12 16:43:03 -08:00 • committed by Katharine Berry
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src/fw/apps/demo_apps/bouncing_box.c Normal file
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/*
* Copyright 2024 Google LLC
*
* 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.
*/
#include "bouncing_box.h"
#include "applib/app.h"
#include "applib/graphics/graphics.h"
#include "applib/graphics/gtypes.h"
#include "applib/ui/app_window_stack.h"
#include "applib/ui/window.h"
#include "kernel/pbl_malloc.h"
#include "process_state/app_state/app_state.h"
static const int TARGET_FPS = 20;
static const int PIXEL_SPEED_PER_FRAME = 4;
typedef struct AppData {
Window window;
GRect box_rect;
int x_velocity;
int y_velocity;
uint8_t color;
} AppData;
static void prv_change_color(AppData *data) {
data->color++; // next RGB value (in lower 6 bits, might overflow to most significant 2 bits)
data->color |= (uint8_t)0b11000000; // make sure color is always 100% opaque
}
static void prv_move_rect(AppData *data) {
data->box_rect.origin.x += (data->x_velocity * PIXEL_SPEED_PER_FRAME);
if (data->box_rect.origin.x <= 0 ||
data->box_rect.origin.x + data->box_rect.size.w > data->window.layer.bounds.size.w) {
data->x_velocity = data->x_velocity * -1;
prv_change_color(data);
}
data->box_rect.origin.y += (data->y_velocity * PIXEL_SPEED_PER_FRAME);
if (data->box_rect.origin.y <= 0 ||
data->box_rect.origin.y + data->box_rect.size.h > data->window.layer.bounds.size.h) {
data->y_velocity = data->y_velocity * -1;
prv_change_color(data);
}
}
static void layer_update_proc(Layer *layer, GContext* ctx) {
AppData *data = app_state_get_user_data();
graphics_context_set_fill_color(ctx, GColorWhite);
graphics_fill_rect(ctx, &layer->bounds);
graphics_context_set_fill_color(ctx, (GColor)data->color);
graphics_fill_rect(ctx, &data->box_rect);
graphics_context_set_stroke_color(ctx, GColorBlack);
graphics_draw_rect(ctx, &data->box_rect);
}
void prv_redraw_timer_cb(void *cb_data) {
AppData *data = app_state_get_user_data();
prv_move_rect(data);
layer_mark_dirty(&data->window.layer);
app_timer_register(1000 / TARGET_FPS, prv_redraw_timer_cb, NULL);
}
static void s_main(void) {
AppData *data = app_malloc_check(sizeof(AppData));
app_state_set_user_data(data);
Window *window = &data->window;
window_init(window, WINDOW_NAME("Bouncing Box"));
window_set_user_data(window, data);
window_set_fullscreen(window, true);
layer_set_update_proc(&window->layer, layer_update_proc);
const bool animated = true;
app_window_stack_push(window, animated);
data->box_rect = GRect(10, 10, 40, 40);
data->x_velocity = 1;
data->y_velocity = 1;
app_timer_register(33, prv_redraw_timer_cb, NULL);
app_event_loop();
}
const PebbleProcessMd* bouncing_box_demo_get_app_info(void) {
static const PebbleProcessMdSystem s_app_info = {
.common.main_func = s_main,
.name = "Bouncing Box"
};
return (const PebbleProcessMd*) &s_app_info;
}