/// <summary>
/// 按照匀速运动模式计算贝塞尔插值点
/// </summary>
/// <param name="bezier">控制点</param>
/// <param name="t1">比例</param>
/// <returns></returns>
private BezierPoints LerpBezierCurve(BezierPoints bezier, float t1)
{
BezierPoints ret = new BezierPoints();
float x1 = bezier.pts[0].X;
float bx1 = bezier.pts[1].X;
float bx2 = bezier.pts[2].X;
float x2 = bezier.pts[3].X;
float y1 = bezier.pts[0].Y;
float by1 = bezier.pts[1].Y;
float by2 = bezier.pts[2].Y;
float y2 = bezier.pts[3].Y;
float t0 = 0;
float u0 = 1.0f - t0;
float u1 = 1.0f - t1;
float qxa = x1 * u0 * u0 + bx1 * 2 * t0 * u0 + bx2 * t0 * t0;
float qxb = x1 * u1 * u1 + bx1 * 2 * t1 * u1 + bx2 * t1 * t1;
float qxc = bx1 * u0 * u0 + bx2 * 2 * t0 * u0 + x2 * t0 * t0;
float qxd = bx1 * u1 * u1 + bx2 * 2 * t1 * u1 + x2 * t1 * t1;
float qya = y1 * u0 * u0 + by1 * 2 * t0 * u0 + by2 * t0 * t0;
float qyb = y1 * u1 * u1 + by1 * 2 * t1 * u1 + by2 * t1 * t1;
float qyc = by1 * u0 * u0 + by2 * 2 * t0 * u0 + y2 * t0 * t0;
float qyd = by1 * u1 * u1 + by2 * 2 * t1 * u1 + y2 * t1 * t1;
float xa = qxa * u0 + qxc * t0;
float xb = qxa * u1 + qxc * t1;
float xc = qxb * u0 + qxd * t0;
float xd = qxb * u1 + qxd * t1;
float ya = qya * u0 + qyc * t0;
float yb = qya * u1 + qyc * t1;
float yc = qyb * u0 + qyd * t0;
float yd = qyb * u1 + qyd * t1;
ret.pts[0].X = xa;
ret.pts[1].X = xb;
ret.pts[2].X = xc;
ret.pts[3].X = xd;
ret.pts[0].Y = ya;
ret.pts[1].Y = yb;
ret.pts[2].Y = yc;
ret.pts[3].Y = yd;
return ret;
}
private BezierPoints[] PreBeziers(int num)
{
BezierPoints[] beziers = new BezierPoints[num];
for (int i = 0; i < num; i++)
{
beziers[i] = new BezierPoints();
}
return beziers;
}
private BezierPoints[] drawP(string[] keyPointList)
{
BezierPoints[] beziers = new BezierPoints[1];
beziers[0] = bezierPie(keyPointList, 0, 2);
return beziers;
}
private BezierPoints[] drawXG(string[] keyPointList)
{
BezierPoints[] beziers = new BezierPoints[2];
beziers[0] = bezierPie(keyPointList, 0, 2);
beziers[1] = bezierLine(keyPointList, 2, 3);
return beziers;
}
private BezierPoints[] drawHZZZ(string[] keyPointList)
{
BezierPoints[] beziers = new BezierPoints[4];
beziers[0] = bezierLine(keyPointList, 0, 1);
beziers[1] = bezierLine(keyPointList, 1, 2);
beziers[2] = bezierLine(keyPointList, 2, 3);
beziers[3] = bezierLine(keyPointList, 3, 4);
return beziers;
}
private BezierPoints[] drawDT(string[] keyPointList)
{
BezierPoints[] beziers = new BezierPoints[]
{
new BezierPoints()
};
PointF base0 = SplitKeyPoints(keyPointList, 0);
PointF base1 = SplitKeyPoints(keyPointList, 1);
PointF base2 = SplitKeyPoints(keyPointList, 2);
beziers[0].pts[0] = new PointF(
base0.X * 0.6f + base1.X * 0.4f,
base0.Y * 0.0f + base1.Y * 1.0f);
beziers[0].pts[1] = new PointF(
base1.X * 0.5f + base2.X * 0.5f,
base1.Y * 0.4f + base2.Y * 0.6f);
beziers[0].pts[2] = beziers[0].pts[1];
beziers[0].pts[3] = beziers[0].pts[1];
return beziers;
}
private BezierPoints[] drawD(string[] keyPointList)
{
BezierPoints[] beziers = new BezierPoints[]
{
new BezierPoints()
};
beziers[0].pts[0] = SplitKeyPoints(keyPointList, 0);
beziers[0].pts[3] = SplitKeyPoints(keyPointList, 2);
beziers[0].pts[1] = new PointF(
beziers[0].pts[0].X * 0.3f + beziers[0].pts[3].X * 0.7f,
beziers[0].pts[0].Y * 0.5f + beziers[0].pts[3].Y * 0.5f);
beziers[0].pts[2] = beziers[0].pts[1];
return beziers;
}
private BezierPoints bezierPie(string[] keyPoints, int idxStart, int idxEnd)
{
BezierPoints pie = new BezierPoints();
pie.pts[0] = SplitKeyPoints(keyPoints, idxStart);
pie.pts[3] = SplitKeyPoints(keyPoints, idxEnd);
PointF base0 = SplitKeyPoints(keyPoints, idxStart + 1);
pie.pts[1] = new PointF(
pie.pts[0].X * 0.2f + base0.X * 0.8f,
base0.Y);
pie.pts[2] = new PointF(
base0.X,
base0.Y * 0.7f + pie.pts[3].Y * 0.3f);
return pie;
}
private BezierPoints bezierLine(string[] keyPoints, int idxStart, int idxEnd)
{
BezierPoints line = new BezierPoints();
line.pts[0] = SplitKeyPoints(keyPoints, idxStart);
line.pts[3] = SplitKeyPoints(keyPoints, idxEnd);
if (Math.Abs(line.pts[3].X - line.pts[0].X) < 8)
line.pts[3].X = line.pts[0].X;
if (Math.Abs(line.pts[3].Y - line.pts[0].Y) < 8)
line.pts[3].Y = line.pts[0].Y;
LinearLerp(line.pts[0], line.pts[3], ref line.pts[1], ref line.pts[2]);
//line.pts[1].X = line.pts[0].X * 0.67f + line.pts[3].X * 0.33f;
//line.pts[1].Y = line.pts[0].Y * 0.67f + line.pts[3].Y * 0.33f;
//line.pts[2].X = line.pts[0].X * 0.33f + line.pts[3].X * 0.67f;
//line.pts[2].Y = line.pts[0].Y * 0.33f + line.pts[3].Y * 0.67f;
return line;
}
