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f753265a79
BREAKING CHANGE This is a huge update which introduces parallel rendering. lv_conf.h needs to be updated too.
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
#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 value_changed_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_obj_t * obj = lv_event_get_target(e);
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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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/**
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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(chart, value_changed_event_cb, LV_EVENT_VALUE_CHANGED, 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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