init Files

libraries/lvgl/examples/widgets/chart/lv_example_chart_6.c

@@ -0,0 +1,49 @@
+#include "../../lv_examples.h"
+#if LV_USE_CHART && LV_BUILD_EXAMPLES
+
+static lv_obj_t * chart;
+static lv_chart_series_t * ser;
+static lv_chart_cursor_t * cursor;
+
+static void value_changed_event_cb(lv_event_t * e)
+{
+    static int32_t last_id = -1;
+    lv_obj_t * obj = lv_event_get_target(e);
+
+    last_id = lv_chart_get_pressed_point(obj);
+    if(last_id != LV_CHART_POINT_NONE) {
+        lv_chart_set_cursor_point(obj, cursor, NULL, last_id);
+    }
+}
+
+/**
+ * Show cursor on the clicked point
+ */
+void lv_example_chart_6(void)
+{
+    chart = lv_chart_create(lv_screen_active());
+    lv_obj_set_size(chart, 200, 150);
+    lv_obj_align(chart, LV_ALIGN_CENTER, 0, -10);
+
+    //    lv_chart_set_axis_tick(chart, LV_CHART_AXIS_PRIMARY_Y, 10, 5, 6, 5, true, 40);
+    //    lv_chart_set_axis_tick(chart, LV_CHART_AXIS_PRIMARY_X, 10, 5, 10, 1, true, 30);
+
+    lv_obj_add_event_cb(chart, value_changed_event_cb, LV_EVENT_VALUE_CHANGED, NULL);
+    lv_obj_refresh_ext_draw_size(chart);
+
+    cursor = lv_chart_add_cursor(chart, lv_palette_main(LV_PALETTE_BLUE), LV_DIR_LEFT | LV_DIR_BOTTOM);
+
+    ser = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
+    uint32_t i;
+    for(i = 0; i < 10; i++) {
+        lv_chart_set_next_value(chart, ser, lv_rand(10, 90));
+    }
+
+    //    lv_chart_set_scale_x(chart, 500);
+
+    lv_obj_t * label = lv_label_create(lv_screen_active());
+    lv_label_set_text(label, "Click on a point");
+    lv_obj_align_to(label, chart, LV_ALIGN_OUT_TOP_MID, 0, -5);
+}
+
+#endif