你得到的线是三个不同的贝塞尔曲线的结合 - 每个组的三个点。 (每一个“Bezier段”?)
如果你想要一个平滑的曲线,你需要将你的9点(或更多)点作为点的单个集合(单个“Bezier段”?),而不是三点组。
编辑︰显然BezierSegment
只有支持三点,所以难怪这不起作用。即使'PolyBezierSegment'只是给贝塞尔细分的集合,而不是一个光滑的贝塞尔...
因此,既然WPF不给你任何有用的东西,我使用数学here敲了一些东西。这是一个数字解决方案,但它似乎是即使有足够的积分,好看,光滑漂亮的高性能:
PolyLineSegment GetBezierApproximation(Point[] controlPoints, int outputSegmentCount)
{
Point[] points = new Point[outputSegmentCount + 1];
for (int i = 0; i <= outputSegmentCount; i++)
{
double t = (double)i/outputSegmentCount;
points[i] = GetBezierPoint(t, controlPoints, 0, controlPoints.Length);
}
return new PolyLineSegment(points, true);
}
Point GetBezierPoint(double t, Point[] controlPoints, int index, int count)
{
if (count == 1)
return controlPoints[index];
var P0 = GetBezierPoint(t, controlPoints, index, count - 1);
var P1 = GetBezierPoint(t, controlPoints, index + 1, count - 1);
return new Point((1 - t) * P0.X + t * P1.X, (1 - t) * P0.Y + t * P1.Y);
}
利用这一点,
private void Grid_Loaded(object sender, RoutedEventArgs e)
{
Point[] points = new[] {
new Point(0, 200),
new Point(0, 0),
new Point(300, 0),
new Point(350, 200),
new Point(400, 0)
};
var b = GetBezierApproximation(points, 256);
PathFigure pf = new PathFigure(b.Points[0], new[] { b }, false);
PathFigureCollection pfc = new PathFigureCollection();
pfc.Add(pf);
var pge = new PathGeometry();
pge.Figures = pfc;
Path p = new Path();
p.Data = pge;
p.Stroke = new SolidColorBrush(Color.FromRgb(255, 0, 0));
((Grid)sender).Children.Add(p);
}
给
我看到有这个数字是很自然的,你可以发布一个具有所需曲线的链接吗? –
或者,也许你想绘制一个单独的部分与7个控制点? –