/// <summary>
/// 设置一个单弧线
/// </summary>
/// <param name="ani"></param>
/// <param name="r">弧度0-180</param>
public static AnimatBase SetArc(AnimatBase ani, float r)
{
ani.DataCache = new float[3];
ani.DataCache[0] = r; //弧度
ani.DataCache[1] = 270 - r * 0.5f; //起始弧度
ani.DataCache[2] = MathH.Cos(270 + r * 0.5f); //弧度总长
ani.Linear = Arc;
return(ani);
}
/// <summary>
/// 设置一个抛物线的中间点，x的值在0-1范围内,返回一个抛物线一般表达式的a，b，c的值，
/// </summary>
/// <param name="ani"></param>
/// <param name="point">参数不能为(1,1)</param>
public static AnimatBase SetParabola(AnimatBase ani, Vector2 point)
{
var v = MathH.Parabola(Vector2.zero, point, new Vector2(1, 1));
ani.DataCache = new float[3];
ani.DataCache[0] = v.x;
ani.DataCache[1] = v.y;
ani.DataCache[2] = v.z;
ani.Linear = Parabola;
return(ani);
}
/// <summary>
/// 设置一个S行曲线
/// </summary>
/// <param name="ani"></param>
/// <param name="x">0-0.5f</param>
/// <param name="y">0-0.5f</param>
public static AnimatBase SetSArc(AnimatBase ani, float x = 0.4f, float y = 0.1f)
{
var tmp = new Vector3[5];
tmp[1].x = x;
tmp[1].y = y;
tmp[2] = new Vector3(0.5f, 0.5f, 0);
tmp[3].x = 0.5f + y;
tmp[3].y = 0.5f + x;
tmp[4] = new Vector3(1, 1, 0);
ani.points = tmp;
ani.Linear = SArc;
return(ani);
}
static float SArc(AnimatBase ani, float a)
{
var tmp = ani.points;
if (tmp == null)
{
return(a);
}
if (a < 0.5f)
{
a *= 2;
return(MathH.BezierPoint(a, ref tmp[0], ref tmp[1], ref tmp[2]).y);
}
else
{
a = (a - 0.5f) * 2;
return(MathH.BezierPoint(a, ref tmp[2], ref tmp[3], ref tmp[4]).y);
}
}
static float Parabola(AnimatBase ani, float a)
{
var temp = ani.DataCache;
return(temp[0] * a * a + a * temp[1] + temp[2]);
}
static float Arc(AnimatBase ani, float a)
{
float s = ani.DataCache[1] + a * ani.DataCache[0];
return(0.5f + 0.5f * MathH.Cos(s) / ani.DataCache[2]);//180-360 -1到1之间
}
