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feat(chart) add scatter chart example

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This commit is contained in:
Gabor Kiss-Vamosi
2021-05-24 15:11:07 +02:00
parent b1f7fbe3b7
commit 7522f4e2f0
2 changed files with 60 additions and 0 deletions
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59
examples/widgets/chart/lv_example_chart_7.c Normal file
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@@ -0,0 +1,59 @@
#include "../../lv_examples.h"
#if LV_USE_CHART && LV_BUILD_EXAMPLES
static void draw_event_cb(lv_event_t * e)
{
lv_obj_draw_part_dsc_t * dsc = lv_event_get_draw_part_dsc(e);
if(dsc->part == LV_PART_ITEMS) {
lv_obj_t * obj = lv_event_get_target(e);
uint32_t cnt = lv_chart_get_point_count(obj);
/*Make older value more transparent*/
dsc->rect_dsc->bg_opa = (LV_OPA_COVER * dsc->id) / (cnt - 1);
/*Make smaller values blue, higher values red*/
dsc->rect_dsc->bg_color = lv_color_mix(lv_palette_main(LV_PALETTE_RED),
lv_palette_main(LV_PALETTE_BLUE),
(dsc->value * LV_OPA_COVER) / 1000);
}
}
static void add_data(lv_timer_t * timer)
{
LV_UNUSED(timer);
static uint32_t cnt = 0;
lv_obj_t * chart = timer->user_data;
lv_chart_set_next_value2(chart, lv_chart_get_series_next(chart, NULL), lv_rand(-100,100), lv_rand(0,1000));
}
/**
* A scatter chart
*/
void lv_example_chart_7(void)
{
lv_obj_t * chart = lv_chart_create(lv_scr_act());
lv_obj_set_size(chart, 200, 150);
lv_obj_align(chart, LV_ALIGN_CENTER, 0, -0);
lv_obj_add_event_cb(chart, draw_event_cb, LV_EVENT_DRAW_PART_BEGIN, NULL);
lv_obj_set_style_line_width(chart, 0, LV_PART_ITEMS);
lv_chart_set_type(chart, LV_CHART_TYPE_SCATTER);
lv_chart_set_axis_tick(chart, LV_CHART_AXIS_PRIMARY_X, 10, 5, 10, 1, true, 30);
lv_chart_set_axis_tick(chart, LV_CHART_AXIS_PRIMARY_Y, 10, 5, 6, 5, true, 50);
lv_chart_set_range(chart, LV_CHART_AXIS_PRIMARY_X, -100, 100);
lv_chart_set_range(chart, LV_CHART_AXIS_PRIMARY_Y, 0, 1000);
lv_chart_set_point_count(chart, 50);
lv_chart_series_t * ser = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
uint32_t i;
for(i = 0; i < 50; i++) {
lv_chart_set_next_value2(chart, ser, lv_rand(-100,100), lv_rand(0,1000));
}
lv_timer_create(add_data, 100, chart);
}
#endif

1
examples/widgets/lv_example_widgets.h
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@@ -56,6 +56,7 @@ void lv_example_chart_3(void);
void lv_example_chart_4(void);
void lv_example_chart_5(void);
void lv_example_chart_6(void);
void lv_example_chart_7(void);
void lv_example_checkbox_1(void);