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85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
#include "../../../lvgl.h"
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#if LV_USE_CHART && LV_DRAW_COMPLEX && LV_BUILD_EXAMPLES
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static lv_obj_t * chart1;
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static lv_chart_series_t * ser1;
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static lv_chart_series_t * ser2;
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static void event_cb(lv_obj_t * obj, lv_event_t e)
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{
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/*Add the faded area before the lines are drawn*/
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if(e == LV_EVENT_DRAW_PART_BEGIN) {
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lv_obj_draw_dsc_t * dsc = lv_event_get_param();
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if(dsc->part != LV_PART_ITEMS) return;
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if(!dsc->p1 || !dsc->p2) return;
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/*Add a line mask that keeps the area below the line*/
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lv_draw_mask_line_param_t line_mask_param;
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lv_draw_mask_line_points_init(&line_mask_param, dsc->p1->x, dsc->p1->y, dsc->p2->x, dsc->p2->y, LV_DRAW_MASK_LINE_SIDE_BOTTOM);
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int16_t line_mask_id = lv_draw_mask_add(&line_mask_param, NULL);
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/*Add a fade effect: transparent bottom covering top*/
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lv_coord_t h = lv_obj_get_height(obj);
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lv_draw_mask_fade_param_t fade_mask_param;
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lv_draw_mask_fade_init(&fade_mask_param, &obj->coords, LV_OPA_COVER, obj->coords.y1 + h / 8, LV_OPA_TRANSP,obj->coords.y2);
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int16_t fade_mask_id = lv_draw_mask_add(&fade_mask_param, NULL);
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/*Draw a rectangle that will be affected by the mask*/
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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_opa = LV_OPA_20;
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draw_rect_dsc.bg_color = dsc->line_dsc->color;
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lv_area_t a;
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a.x1 = dsc->p1->x;
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a.x2 = dsc->p2->x - 1;
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a.y1 = LV_MIN(dsc->p1->y, dsc->p2->y);
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a.y2 = obj->coords.y2;
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lv_draw_rect(&a, dsc->clip_area, &draw_rect_dsc);
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/*Remove the masks*/
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lv_draw_mask_remove_id(line_mask_id);
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lv_draw_mask_remove_id(fade_mask_id);
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}
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}
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static void add_data(lv_timer_t * timer)
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{
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LV_UNUSED(timer);
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static uint32_t cnt = 0;
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lv_chart_set_next_value(chart1, ser1, lv_rand(20, 90));
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if(cnt % 4 == 0) lv_chart_set_next_value(chart1, ser2, lv_rand(40, 60));
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cnt++;
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}
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/**
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* Add a faded area effect to the line chart
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*/
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void lv_example_chart_2(void)
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{
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/*Create a chart1*/
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chart1 = lv_chart_create(lv_scr_act());
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lv_obj_set_size(chart1, 200, 150);
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lv_obj_center(chart1);
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lv_chart_set_type(chart1, LV_CHART_TYPE_LINE); /*Show lines and points too*/
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lv_obj_add_event_cb(chart1, event_cb, NULL);
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lv_chart_set_update_mode(chart1, LV_CHART_UPDATE_MODE_CIRCULAR);
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/*Add two data series*/
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ser1 = lv_chart_add_series(chart1, lv_color_red(), LV_CHART_AXIS_PRIMARY_Y);
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ser2 = lv_chart_add_series(chart1, lv_color_blue(), LV_CHART_AXIS_SECONDARY_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(chart1, ser1, lv_rand(20, 90));
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lv_chart_set_next_value(chart1, ser2, lv_rand(30, 70));
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}
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lv_timer_create(add_data, 200, NULL);
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}
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#endif
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