98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
#include "../../lv_examples.h"
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#if LV_USE_CHART && LV_BUILD_EXAMPLES
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static void event_cb(lv_event_t * e)
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{
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lv_event_code_t code = lv_event_get_code(e);
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lv_obj_t * chart = lv_event_get_target(e);
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if(code == LV_EVENT_VALUE_CHANGED) {
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lv_obj_invalidate(chart);
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}
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if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
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int32_t * s = lv_event_get_param(e);
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*s = LV_MAX(*s, 20);
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}
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else if(code == LV_EVENT_DRAW_POST_END) {
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int32_t id = lv_chart_get_pressed_point(chart);
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if(id == LV_CHART_POINT_NONE) return;
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LV_LOG_USER("Selected point %d", (int)id);
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lv_chart_series_t * ser = lv_chart_get_series_next(chart, NULL);
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while(ser) {
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lv_point_t p;
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lv_chart_get_point_pos_by_id(chart, ser, id, &p);
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int32_t * y_array = lv_chart_get_y_array(chart, ser);
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int32_t value = y_array[id];
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/*Draw a rectangle above the clicked point*/
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lv_layer_t * layer = lv_event_get_layer(e);
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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_color_black();
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draw_rect_dsc.bg_opa = LV_OPA_50;
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draw_rect_dsc.radius = 3;
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lv_area_t chart_obj_coords;
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lv_obj_get_coords(chart, &chart_obj_coords);
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lv_area_t rect_area;
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rect_area.x1 = chart_obj_coords.x1 + p.x - 20;
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rect_area.x2 = chart_obj_coords.x1 + p.x + 20;
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rect_area.y1 = chart_obj_coords.y1 + p.y - 30;
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rect_area.y2 = chart_obj_coords.y1 + p.y - 10;
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lv_draw_rect(layer, &draw_rect_dsc, &rect_area);
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/*Draw the value as label to the center of the rectangle*/
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char buf[16];
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lv_snprintf(buf, sizeof(buf), LV_SYMBOL_DUMMY"$%d", value);
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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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draw_label_dsc.text = buf;
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draw_label_dsc.text_local = 1;
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draw_label_dsc.align = LV_TEXT_ALIGN_CENTER;
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lv_area_t label_area = rect_area;
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lv_area_set_height(&label_area, lv_font_get_line_height(draw_label_dsc.font));
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lv_area_align(&rect_area, &label_area, LV_ALIGN_CENTER, 0, 0);
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lv_draw_label(layer, &draw_label_dsc, &label_area);
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ser = lv_chart_get_series_next(chart, ser);
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}
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}
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else if(code == LV_EVENT_RELEASED) {
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lv_obj_invalidate(chart);
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}
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}
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/**
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* Show the value of the pressed points
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*/
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void lv_example_chart_3(void)
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{
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/*Create a chart*/
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lv_obj_t * chart;
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chart = lv_chart_create(lv_screen_active());
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lv_obj_set_size(chart, 200, 150);
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lv_obj_center(chart);
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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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/*Zoom in a little in X*/
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// lv_chart_set_scale_x(chart, 800);
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/*Add two data series*/
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lv_chart_series_t * ser1 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
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lv_chart_series_t * ser2 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_GREEN), 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, ser1, lv_rand(60, 90));
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lv_chart_set_next_value(chart, ser2, lv_rand(10, 40));
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}
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}
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#endif
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