#define Graph_And_Chart_PRO
using UnityEngine;
using System.Collections;
using ChartAndGraph;
using UnityEngine.UI;

public class MarkerTextLine : MonoBehaviour {

    public GraphChartBase Chart;
    public Text TextObject;
    /// <summary>
    /// the first line position in graph coordinates
    /// </summary> 
    public DoubleVector2 point1;
    /// <summary> 
    /// the second line position in graph coordinates
    /// </summary>
    public DoubleVector2 point2; 
    /// <summary>
    /// offsets the text on the x axis away from the selected point
    /// </summary>
    public float SeperationOffset = 0f;
    /// <summary>
    /// offsets the text on the y axus away from the selected point
    /// </summary>
    public float ElevationOffset = 0f;

    public bool Rotate = true;

    // Use this for initialization
    void Start()
    {
    }

    // Update is called once per frame
    void Update()
    {
        if (Chart == null)
            return;
        Vector3 res1,res2;
        if (Chart.PointToWorldSpace(out res1, point1.x, point1.y))
        {
            if(Chart.PointToWorldSpace(out res2,point2.x,point2.y))
            {
                Vector2 finalPos = (res2 + res1) * 0.5f;
                Vector2 seperationVector = (res2 - res1).normalized;
                Vector2 elevationVector = ChartCommon.Perpendicular(seperationVector);
                TextObject.transform.position = finalPos + SeperationOffset * seperationVector + ElevationOffset * elevationVector;
                if(Rotate)
                {
                    TextObject.transform.localRotation = Quaternion.Euler(0f, 0f,Mathf.Rad2Deg * Mathf.Atan2(seperationVector.y, seperationVector.x));
                }
            }
        }
    }
}