acid-drop

- Hacking the planet from a LilyGo T-Deck using custom firmware
git clone git://git.acid.vegas/acid-drop.git
lv_example_chart_4.c (2709B)
      1 #include "../../lv_examples.h"
      2 #if LV_USE_CHART && LV_BUILD_EXAMPLES
      3 
      4 
      5 static void event_cb(lv_event_t * e)
      6 {
      7     lv_event_code_t code = lv_event_get_code(e);
      8     lv_obj_t * chart = lv_event_get_target(e);
      9 
     10     if(code == LV_EVENT_VALUE_CHANGED) {
     11         lv_obj_invalidate(chart);
     12     }
     13     if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
     14         lv_coord_t * s = lv_event_get_param(e);
     15         *s = LV_MAX(*s, 20);
     16     }
     17     else if(code == LV_EVENT_DRAW_POST_END) {
     18         int32_t id = lv_chart_get_pressed_point(chart);
     19         if(id == LV_CHART_POINT_NONE) return;
     20 
     21         LV_LOG_USER("Selected point %d", (int)id);
     22 
     23         lv_chart_series_t * ser = lv_chart_get_series_next(chart, NULL);
     24         while(ser) {
     25             lv_point_t p;
     26             lv_chart_get_point_pos_by_id(chart, ser, id, &p);
     27 
     28             lv_coord_t * y_array = lv_chart_get_y_array(chart, ser);
     29             lv_coord_t value = y_array[id];
     30 
     31             char buf[16];
     32             lv_snprintf(buf, sizeof(buf), LV_SYMBOL_DUMMY"$%d", value);
     33 
     34             lv_draw_rect_dsc_t draw_rect_dsc;
     35             lv_draw_rect_dsc_init(&draw_rect_dsc);
     36             draw_rect_dsc.bg_color = lv_color_black();
     37             draw_rect_dsc.bg_opa = LV_OPA_50;
     38             draw_rect_dsc.radius = 3;
     39             draw_rect_dsc.bg_img_src = buf;
     40             draw_rect_dsc.bg_img_recolor = lv_color_white();
     41 
     42             lv_area_t a;
     43             a.x1 = chart->coords.x1 + p.x - 20;
     44             a.x2 = chart->coords.x1 + p.x + 20;
     45             a.y1 = chart->coords.y1 + p.y - 30;
     46             a.y2 = chart->coords.y1 + p.y - 10;
     47 
     48             lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);
     49             lv_draw_rect(draw_ctx, &draw_rect_dsc, &a);
     50 
     51             ser = lv_chart_get_series_next(chart, ser);
     52         }
     53     }
     54     else if(code == LV_EVENT_RELEASED) {
     55         lv_obj_invalidate(chart);
     56     }
     57 }
     58 
     59 /**
     60  * Show the value of the pressed points
     61  */
     62 void lv_example_chart_4(void)
     63 {
     64     /*Create a chart*/
     65     lv_obj_t * chart;
     66     chart = lv_chart_create(lv_scr_act());
     67     lv_obj_set_size(chart, 200, 150);
     68     lv_obj_center(chart);
     69 
     70     lv_obj_add_event_cb(chart, event_cb, LV_EVENT_ALL, NULL);
     71     lv_obj_refresh_ext_draw_size(chart);
     72 
     73     /*Zoom in a little in X*/
     74     lv_chart_set_zoom_x(chart, 800);
     75 
     76     /*Add two data series*/
     77     lv_chart_series_t * ser1 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
     78     lv_chart_series_t * ser2 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_GREEN), LV_CHART_AXIS_PRIMARY_Y);
     79     uint32_t i;
     80     for(i = 0; i < 10; i++) {
     81         lv_chart_set_next_value(chart, ser1, lv_rand(60, 90));
     82         lv_chart_set_next_value(chart, ser2, lv_rand(10, 40));
     83     }
     84 }
     85 
     86 #endif