69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
#include "../../lv_examples.h"
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#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
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#define CANVAS_WIDTH 300
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#define CANVAS_HEIGHT 200
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static void timer_cb(lv_timer_t * timer)
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{
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static int32_t counter = 0;
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const char * string = "windstorrrrrrrrrrrrrrrrm~>>>";
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const int16_t string_len = lv_strlen(string);
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lv_obj_t * canvas = lv_timer_get_user_data(timer);
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lv_layer_t layer;
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lv_canvas_init_layer(canvas, &layer);
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lv_canvas_fill_bg(canvas, lv_color_white(), LV_OPA_COVER);
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lv_draw_letter_dsc_t letter_dsc;
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lv_draw_letter_dsc_init(&letter_dsc);
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letter_dsc.color = lv_color_hex(0xff0000);
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letter_dsc.font = lv_font_get_default();
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{
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#define CURVE2_X(t) ((t) * 2 + lv_trigo_cos((t) * 5) * 40 / 32767 - 10)
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#define CURVE2_Y(t, T) ((t) * lv_trigo_sin(((t) + (T)) * 5) * 40 / 32767 / 80 + CANVAS_HEIGHT / 2)
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int32_t pre_x = CURVE2_X(-1);
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int32_t pre_y = CURVE2_Y(-1, 0);
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for(int16_t i = 0; i < string_len; i++) {
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const int32_t angle = i * 5;
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const int32_t x = CURVE2_X(angle);
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const int32_t y = CURVE2_Y(angle + 30, counter / 2);
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letter_dsc.unicode = (uint32_t)string[i % string_len];
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letter_dsc.rotation = lv_atan2(y - pre_y, x - pre_x) * 10;
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letter_dsc.color = lv_color_hsv_to_rgb(i * 10, 100, 100);
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lv_draw_letter(&layer, &letter_dsc, &(lv_point_t) {
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.x = x, .y = y
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});
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pre_x = x;
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pre_y = y;
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}
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}
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lv_canvas_finish_layer(canvas, &layer);
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counter++;
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}
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void lv_example_canvas_10(void)
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{
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/*Create a buffer for the canvas*/
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LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
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LV_DRAW_BUF_INIT_STATIC(draw_buf);
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lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
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lv_obj_set_size(canvas, CANVAS_WIDTH, CANVAS_HEIGHT);
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lv_obj_center(canvas);
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lv_canvas_set_draw_buf(canvas, &draw_buf);
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lv_timer_create(timer_cb, 16, canvas);
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}
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#endif
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