[英]WPF: How to draw this polygon?
我想绘制以下红色多边形:
问题是如果我使用诸如此类的东西:
Polygon poly = new Polygon();
poly.StrokeThickness = 2;
poly.Stroke = Brushes.Black;
PointCollection points = new PointCollection();
for (int i = 0; i < this.NumberOfMetrics; i++)
{
points.Add(new Point(MAX_VALUE - this.Metrics[n, i] * Math.Cos(DegreeToRadian(i * (360 / (this.NumberOfMetrics)))), MAX_Y_GUI - this.Metrics[n, i] * Math.Sin(DegreeToRadian(i * (360 / (this.NumberOfMetrics))))));
}
poly.Points = points;
然后,多边形总是被“填充”,在上面的示例中,绘制了红色和绿色多边形。
我已经尝试将4个“内部”点添加到PointCollection中,但是什么也没画。 那么我该如何实现呢?
我尝试了大卫提出的解决方案:
for (int n = 0; n < this.NumberOfRevisions; n++)
{
Path path = new Path();
CombinedGeometry geometry = new CombinedGeometry();
geometry.GeometryCombineMode = GeometryCombineMode.Union;
Polygon poly = new Polygon();
PointCollection points = new PointCollection();
for (int i = 0; i < this.NumberOfMetrics; i++)
{
points.Add(new Point(MAX_VALUE - this.Metrics[n, i] * Math.Cos(DegreeToRadian(i * (360 / (this.NumberOfMetrics)))), MAX_Y_GUI - this.Metrics[n, i] * Math.Sin(DegreeToRadian(i * (360 / (this.NumberOfMetrics))))));
}
poly.Points = points;
geometry.Geometry1 = poly.RenderedGeometry;
geometry.Geometry2 = poly.RenderedGeometry;
path.Data = geometry;
polygons.Add(poly);
paths.Add(path);
}
这只是一个测试,但我深思熟虑,因此我应该获得与以前相同的结果,但是它没有任何作用。 我的代码有问题吗?
如果要有2个独立的形状,并且绿色(如评论中所述)可以透明,则最好的方法是使用组合的几何:
http://msdn.microsoft.com/zh-cn/library/ms653071%28v=VS.85%29.aspx
借助于此,您可以首先创建绿色几何图形,然后创建红色几何图形,方法是从红色几何图形减去绿色(或其副本)以创建孔。
所以基本上:
这样你就可以得到想要的效果
在Xaml中更容易完成,在C#中更复杂,但仍然可行。
编辑:将组合几何设置为路径的数据:
Path myPath = new Path();
CombinedGeometry myCombinedGeometry = new CombinedGeometry()
// here you set the combinedGeometry's geometries to create the shape you want
myPath.Data = myCombinedGeometry;
myGrid.Children.Add(myPath);
顺便说一句,PATH将是您为颜色设置“填充/描边”属性的位置,而不是内部几何形状。 (请参见上面链接中的xaml中的示例,您基本上只需将代码转换为C#)
编辑2:
不要忘记在路径上设置填充:
for (int n = 0; n < this.NumberOfRevisions; n++)
{
CombinedGeometry geometry = new CombinedGeometry() { GeometryCombineMode = GeometryCombineMode.Union };
PointCollection points = new PointCollection();
for (int i = 0; i < this.NumberOfMetrics; i++)
{
points.Add(new Point(MAX_VALUE - this.Metrics[n, i] * Math.Cos(DegreeToRadian(i * (360 / (this.NumberOfMetrics)))), MAX_Y_GUI - this.Metrics[n, i] * Math.Sin(DegreeToRadian(i * (360 / (this.NumberOfMetrics))))));
}
Polygon poly = new Polygon();
poly.Points = points;
geometry.Geometry1 = poly.RenderedGeometry;
geometry.Geometry2 = poly.RenderedGeometry;
polygons.Add(poly);
paths.Add(path = new Path() { Data = geometry, Fill = Brushes.Red, Stroke = Brushes.Transparent });
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.