float GetDefaultLineSize() const;
/**
+ * @brief Sets the relative line size to the original line size.
+ *
+ * @param[in] relativeLineSize The relativeline size.
+ *
+ * @return True if relativeLineSize has been updated, false otherwise
+ */
+ bool SetRelativeLineSize(float lineSize);
+
+ /**
+ * @brief Retrieves the relative line size.
+ *
+ * @return The relative line size.
+ */
+ float GetRelativeLineSize() const;
+
+ /**
* @brief Sets the input text's color.
*
* @param[in] color The input text's color.
Vector<Vector2> GetTextPosition(CharacterIndex startIndex, CharacterIndex endIndex);
/**
+ * @brief Gets the bounding box of a specific text range.
+ *
+ * @param[in] startIndex start index of the text requested to get bounding box to.
+ * @param[in] endIndex end index(included) of the text requested to get bounding box to.
+ * @return bounding box of the requested text.
+ */
+ Rect<> GetTextBoundingRectangle(CharacterIndex startIndex, CharacterIndex endIndex);
+
+ /**
* @brief Sets the layout direction changed.
*/
void ChangedLayoutDirection();