1 files changed, 138 insertions, 0 deletions
diff --git a/lib/luavgl/simulator/widgets/lv_pointer.c b/lib/luavgl/simulator/widgets/lv_pointer.c
new file mode 100644
index 00000000..5fe8a103
--- /dev/null
+++ b/lib/luavgl/simulator/widgets/lv_pointer.c
@@ -0,0 +1,138 @@
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_pointer.h"
+
+#if LV_USE_POINTER
+
+/*********************
+ *      DEFINES
+ *********************/
+#define MY_CLASS &lv_pointer_class
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static void lv_pointer_constructor(const lv_obj_class_t* class_p,
+                                    lv_obj_t* obj);
+static void angle_update(lv_obj_t* obj);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+const lv_obj_class_t lv_pointer_class = {
+    .constructor_cb = lv_pointer_constructor,
+    .instance_size = sizeof(lv_pointer_t),
+    .base_class = &lv_img_class,
+};
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+lv_obj_t* lv_pointer_create(lv_obj_t* parent)
+{
+    lv_obj_t* obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+
+    /* pointer can rotate out of parent's area. */
+    lv_obj_add_flag(parent, LV_OBJ_FLAG_OVERFLOW_VISIBLE);
+    return obj;
+}
+
+void lv_pointer_set_value(lv_obj_t* obj, int value)
+{
+    lv_pointer_t* pointer = (lv_pointer_t*)obj;
+    if (pointer->value == value) {
+        return;
+    }
+
+    pointer->value = value;
+    angle_update(obj);
+}
+
+void lv_pointer_set_range(lv_obj_t* obj, int value_start, int value_range,
+                           int angle_start, int angle_range)
+{
+    lv_pointer_t* pointer = (lv_pointer_t*)obj;
+    pointer->value_start = value_start;
+    pointer->value_range = value_range;
+    pointer->angle_start = angle_start;
+    pointer->angle_range = angle_range;
+
+    /* update angle */
+    angle_update(obj);
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+static void lv_pointer_constructor(const lv_obj_class_t* class_p,
+                                    lv_obj_t* obj)
+{
+    LV_UNUSED(class_p);
+    LV_TRACE_OBJ_CREATE("begin");
+    lv_pointer_t* pointer = (lv_pointer_t*)obj;
+
+    /* set default range parameters */
+    pointer->angle_start = 0;
+    pointer->angle_range = 360 * 10;
+    pointer->value_start = 0;
+    pointer->value_range = 100;
+    LV_TRACE_OBJ_CREATE("finished");
+}
+
+static void angle_update(lv_obj_t* obj)
+{
+    lv_pointer_t* pointer = (lv_pointer_t*)obj;
+    int angle = 0;
+    int value = pointer->value;
+    int value_start = pointer->value_start;
+    int value_range = pointer->value_range;
+    int angle_start = pointer->angle_start;
+    int angle_range = pointer->angle_range;
+
+    if (value_range != 0) {
+        /* Check value overflow, overwrite angle if so. */
+        int delta = value - value_start;
+        angle = angle_start;
+        angle += (delta * angle_range) / value_range;
+
+        /* check overflow */
+        if (value_range > 0) {
+            if (delta > value_range)
+                angle = angle_start + angle_range;
+            else if (value < value_start)
+                angle = angle_start;
+        } else { /* case of value_range < 0 */
+            if (delta < value_range)
+                angle = angle_start + angle_range;
+            else if (value > value_start)
+                angle = angle_start;
+        }
+
+        while (angle >= 3600)
+            angle -= 3600;
+        while (angle < 0)
+            angle += 3600;
+    }
+
+    if (angle == lv_img_get_angle(obj)) {
+        /* not changed */
+        return;
+    }
+
+    lv_img_set_angle(obj, angle);
+}
+
+#endif