public static mPoint[] createCurve(mPoint[] orip)
{
List <mPoint> curvePoint = new List <mPoint>();
int oripl = orip.Length;
double scale = 0.16;
mPoint[] ap = new mPoint[oripl];
mPoint[] bp = new mPoint[oripl];
ap[0] = new mPoint(
orip[0].x + (orip[1].x - orip[0].x) * scale,
orip[0].y + (orip[1].y - orip[0].y) * scale);
bp[oripl - 2] = new mPoint(
orip[oripl - 1].x - (orip[oripl - 1].x - orip[oripl - 2].x) * scale,
orip[oripl - 1].y - (orip[oripl - 1].y - orip[oripl - 2].y) * scale);
for (int i = 1; i < oripl - 1; i++)
{
ap[i] = new mPoint(
orip[i].x + (orip[i + 1].x - orip[i - 1].x) * scale,
orip[i].y + (orip[i + 1].y - orip[i - 1].y) * scale);
}
for (int i = 0; i < oripl - 2; i++)
{
bp[i] = new mPoint(
orip[i + 1].x - (orip[i + 2].x - orip[i].x) * scale,
orip[i + 1].y - (orip[i + 2].y - orip[i].y) * scale);
}
//生成4控制点，产生贝塞尔曲线
for (int i = 0; i < oripl - 1; i++)
{
mPoint[] points = new mPoint[4];
points[0] = orip[i];
points[1] = ap[i];
points[2] = bp[i];
points[3] = orip[i + 1];
double u = 1;
double du = 1.0 / (points[3].x - points[0].x);
for (int j = 0; j < points[3].x - points[0].x; j++)
{
int px = (int)bezier3funcX(u, points);
int py = (int)bezier3funcY(u, points);
//u的步长决定曲线的疏密
u -= du;
mPoint tempP = new mPoint(px, py);
//存入曲线点
curvePoint.Add(tempP);
}
}
return(curvePoint.ToArray());
}
/// <summary>
/// 获取与音量曲线一一对应的音量缩放比例
/// </summary>
/// <param name="len"></param>
/// <param name="zipdata"></param>
/// <returns></returns>
public static double[] getZipPoint(int len, double[] zipdata)
{
double[] res = new double[len];
if (zipdata.Length == 0)
{
for (int i = 0; i < len; i++)
{
res[i] = 1;
}
}
else if (zipdata.Length == 1)
{
for (int i = 0; i < len; i++)
{
res[i] = zipdata[0];
}
}
else if (zipdata.Length == 2)
{
for (int i = 0; i < len; i++)
{
res[i] = zipdata[0] + ((zipdata[1] - zipdata[0]) * i / zipdata.Length);
}
}
else
{
mPoint[] zippoints = new mPoint[zipdata.Length];
for (int i = 0; i < zipdata.Length; i++)
{
zippoints[i] = new mPoint();
}
for (int i = 0; i < zipdata.Length; i++)
{
zippoints[i].x = len * i / (zipdata.Length - 1);
zippoints[i].y = (int)(zipdata[i] * 10000);
}
mPoint[] zipres = BezierControl.createCurve(zippoints);
for (int i = 0; i < len; i++)
{
res[i] = (double)zipres[i].y / 10000;
}
}
return(res);
}
