using UnityEngine;

public class CustomizeTooltipExample:MonoBehaviour
{
    private void Start()
    {
        // Intercepts drawing of marker tooltips
        OnlineMapsMarkerBase.OnMarkerDrawTooltip += OnMarkerDrawTooltip;
    }

    private void OnMarkerDrawTooltip(OnlineMapsMarkerBase marker)
    {
        // If the marker has no label returns
        if (string.IsNullOrEmpty(marker.label)) return;

        // Customize tooltip style
        GUIStyle style = new GUIStyle(GUI.skin.label);
        style.normal.textColor = Color.red;

        // Calculates the font size based on the width of the screen
        style.fontSize = Screen.width / 50;

        // Create GUIContent
        GUIContent tip = new GUIContent(marker.label);

        // Calculates size of tooltip
        Vector2 size = style.CalcSize(tip);

        // Using the position of the mouse, but you can use the on-screen marker position
        Vector3 position = Input.mousePosition;

        // Draw tooltip
        GUI.Label(new Rect(position.x - size.x / 2, Screen.height - position.y - size.y - 20, size.x + 10, size.y + 5), marker.label, style);
    }
}