88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
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#include "../../lv_examples.h"
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#if LV_USE_CHART && LV_BUILD_EXAMPLES
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static lv_obj_t * chart;
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static lv_chart_series_t * ser;
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static lv_chart_cursor_t * cursor;
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static void event_cb(lv_event_t * e)
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{
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static int32_t last_id = -1;
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lv_event_code_t code = lv_event_get_code(e);
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lv_obj_t * obj = lv_event_get_target(e);
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if(code == LV_EVENT_VALUE_CHANGED) {
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last_id = lv_chart_get_pressed_point(obj);
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if(last_id != LV_CHART_POINT_NONE) {
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lv_chart_set_cursor_point(obj, cursor, NULL, last_id);
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}
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}
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else if(code == LV_EVENT_DRAW_PART_END) {
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lv_obj_draw_part_dsc_t * dsc = lv_event_get_draw_part_dsc(e);
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if(!lv_obj_draw_part_check_type(dsc, &lv_chart_class, LV_CHART_DRAW_PART_CURSOR)) return;
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if(dsc->p1 == NULL || dsc->p2 == NULL || dsc->p1->y != dsc->p2->y || last_id < 0) return;
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lv_coord_t * data_array = lv_chart_get_y_array(chart, ser);
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lv_coord_t v = data_array[last_id];
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char buf[16];
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lv_snprintf(buf, sizeof(buf), "%d", v);
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lv_point_t size;
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lv_txt_get_size(&size, buf, LV_FONT_DEFAULT, 0, 0, LV_COORD_MAX, LV_TEXT_FLAG_NONE);
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lv_area_t a;
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a.y2 = dsc->p1->y - 5;
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a.y1 = a.y2 - size.y - 10;
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a.x1 = dsc->p1->x + 10;
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a.x2 = a.x1 + size.x + 10;
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lv_draw_rect_dsc_t draw_rect_dsc;
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lv_draw_rect_dsc_init(&draw_rect_dsc);
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draw_rect_dsc.bg_color = lv_palette_main(LV_PALETTE_BLUE);
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draw_rect_dsc.radius = 3;
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lv_draw_rect(dsc->draw_ctx, &draw_rect_dsc, &a);
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lv_draw_label_dsc_t draw_label_dsc;
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lv_draw_label_dsc_init(&draw_label_dsc);
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draw_label_dsc.color = lv_color_white();
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a.x1 += 5;
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a.x2 -= 5;
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a.y1 += 5;
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a.y2 -= 5;
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lv_draw_label(dsc->draw_ctx, &draw_label_dsc, &a, buf, NULL);
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}
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}
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/**
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* Show cursor on the clicked point
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*/
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void lv_example_chart_6(void)
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{
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chart = lv_chart_create(lv_scr_act());
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lv_obj_set_size(chart, 200, 150);
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lv_obj_align(chart, LV_ALIGN_CENTER, 0, -10);
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lv_chart_set_axis_tick(chart, LV_CHART_AXIS_PRIMARY_Y, 10, 5, 6, 5, true, 40);
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lv_chart_set_axis_tick(chart, LV_CHART_AXIS_PRIMARY_X, 10, 5, 10, 1, true, 30);
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lv_obj_add_event_cb(chart, event_cb, LV_EVENT_ALL, NULL);
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lv_obj_refresh_ext_draw_size(chart);
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cursor = lv_chart_add_cursor(chart, lv_palette_main(LV_PALETTE_BLUE), LV_DIR_LEFT | LV_DIR_BOTTOM);
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ser = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
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uint32_t i;
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for(i = 0; i < 10; i++) {
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lv_chart_set_next_value(chart, ser, lv_rand(10, 90));
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}
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lv_chart_set_zoom_x(chart, 500);
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lv_obj_t * label = lv_label_create(lv_scr_act());
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lv_label_set_text(label, "Click on a point");
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lv_obj_align_to(label, chart, LV_ALIGN_OUT_TOP_MID, 0, -5);
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}
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#endif
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