GPath drawing test

#include "pebble_os.h"
#include "pebble_app.h"
#include "pebble_fonts.h"


#define MY_UUID { 0x0E, 0x12, 0x99, 0x94, 0x88, 0xAB, 0x4E, 0x08, 0xA2, 0x51, 0xFB, 0x33, 0xD0, 0xD5, 0xC9, 0xE2 }
PBL_APP_INFO(MY_UUID,
    "Graphics test", "matejdro",
    1, 0, /* App version */
    DEFAULT_MENU_ICON,
    APP_INFO_STANDARD_APP);

Window window;
Layer circle;

static const GPathInfo ARROW = {
.num_points = 7,
.points = (GPoint []) {{-30, -5}, {0, -35}, {30, -5}, {15, -5}, {15, 35}, {-15, 35}, {-15,-5}}
};
GPath arrow;

int16_t angle = 0;

void paint_circle(Layer *layer, GContext *ctx)
{
  graphics_context_set_fill_color(ctx, GColorBlack);

  graphics_fill_circle(ctx, GPoint(144 / 2, 95 / 2), 95 / 2);
  graphics_context_set_fill_color(ctx, GColorWhite);

  gpath_init(&arrow, &ARROW);
  gpath_move_to(&arrow, GPoint(144 / 2, 95 / 2));
  gpath_rotate_to(&arrow, TRIG_MAX_ANGLE * angle / 360);
  gpath_draw_filled(ctx, &arrow);
}

void handle_init(AppContextRef ctx) {
  (void)ctx;

  window_init(&window, "Test window");
  window_stack_push(&window, true /* Animated */);

  Layer* topLayer = window_get_root_layer(&window);

  layer_init(&circle, GRect(0, 168 - 16 - 97, 144, 95)); //144*80
  circle.update_proc = paint_circle;
  layer_add_child(topLayer, &circle);
}

void handle_tick(AppContextRef app_ctx, PebbleTickEvent *event) {
   angle+= 20;
   if (angle > 359)
     angle -= 360;

   layer_mark_dirty(&circle);

}


void pbl_main(void *params) {
  PebbleAppHandlers handlers = {
      .init_handler = &handle_init,
      .tick_info = {
            .tick_handler = &handle_tick,
            .tick_units = SECOND_UNIT
          },
  };
  app_event_loop(params, &handlers);
}