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67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
2 years ago
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#include "../lv_examples.h"
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#if LV_BUILD_EXAMPLES
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static int n = 3;
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static lv_obj_t * label = NULL;
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static void timer_cb(lv_timer_t * timer)
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{
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if(n < 3 || n > 32) {
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n = 3;
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}
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else {
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static uint32_t old_tick = 0;
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uint32_t tick = lv_tick_get();
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if(!old_tick) {
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old_tick = tick;
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}
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if(tick - old_tick > 3000) {
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n++;
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lv_label_set_text_fmt(label, "%d sides", n);
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old_tick = tick;
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}
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}
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lv_obj_invalidate(timer->user_data);
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}
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static void event_cb(lv_event_t * e)
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{
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/*The original target of the event. Can be the buttons or the container*/
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lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);
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lv_draw_rect_dsc_t draw_dsc;
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lv_draw_rect_dsc_init(&draw_dsc);
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draw_dsc.bg_color = lv_palette_main(LV_PALETTE_LIGHT_GREEN);
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draw_dsc.bg_opa = LV_OPA_COVER;
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lv_point_t points[32];
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int i, r = 150;
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uint32_t tick = lv_tick_get();
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for(i = 0; i < n; i++) {
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int angle = i * 360 / n + ((tick % 36000) / 100);
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lv_coord_t x = 150 + (r * lv_trigo_cos(angle) >> LV_TRIGO_SHIFT), y =
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150 + (r * lv_trigo_sin(angle) >> LV_TRIGO_SHIFT);
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points[i].x = x;
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points[i].y = y;
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}
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lv_draw_polygon(draw_ctx, &draw_dsc, points, n);
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}
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/**
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* Demonstrate event bubbling
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*/
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void lv_example_event_4(void)
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{
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lv_obj_t * cont = lv_obj_create(lv_scr_act());
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lv_obj_remove_style_all(cont);
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lv_obj_set_size(cont, 300, 300);
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label = lv_label_create(cont);
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lv_label_set_text_fmt(label, "%d sides", n);
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lv_obj_center(label);
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lv_obj_add_event_cb(cont, event_cb, LV_EVENT_DRAW_MAIN, NULL);
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lv_timer_create(timer_cb, 17, cont);
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}
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#endif
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