[英]Determine the x,y,z coordinates of any point on a line defined by two 3D points using distance from origin-point as the third parameter?
[英]DrawEllipse from two joint (Point, or rather X and Y coordinates)
我希望按椭圆而不是按行显示骨架。 我有两个坐标为X和Y的点。当我想绘制一个椭圆时,我需要
public abstract void DrawEllipse(
Brush brush,
Pen pen,
Point center,
double radiusX,
double radiusY
)
所以我已经尝试过使用此代码,但是有一些错误(不知道radiusY):
double centerX = (jointPoints[jointType0].X + jointPoints[jointType1].X) / 2;
double centerY = (jointPoints[jointType0].Y + jointPoints[jointType1].Y) / 2;
double radiusX =Math.Sqrt( (Math.Pow((jointPoints[jointType1].X - jointPoints[jointType0].X), 2)) + (Math.Pow((jointPoints[jointType1].Y - jointPoints[jointType0].Y), 2)));
drawingContext.DrawEllipse(null, drawPen, new Point(centerX, centerY), radiusX, radiusX/5);
谁能帮我?
private void DrawBone(IReadOnlyDictionary<JointType, Joint> joints, IDictionary<JointType, Point> jointPoints, JointType jointType0, JointType jointType1, DrawingContext drawingContext, Pen drawingPen,List<JointType> badJoint)
{
Joint joint0 = joints[jointType0];
Joint joint1 = joints[jointType1];
// If we can't find either of these joints, exit
if (joint0.TrackingState == TrackingState.NotTracked ||
joint1.TrackingState == TrackingState.NotTracked)
{
return;
}
// We assume all drawn bones are inferred unless BOTH joints are tracked
Pen drawPen = this.inferredBonePen;
if ((joint0.TrackingState == TrackingState.Tracked) && (joint1.TrackingState == TrackingState.Tracked))
{
drawPen = drawingPen;
}
//If a bone makes parts of an one bad angle respect reference angle
if (badJoint.Contains(jointType0) && badJoint.Contains(jointType0))
drawPen = new Pen(Brushes.Red, 6);
drawingContext.DrawLine(drawPen, jointPoints[jointType0], jointPoints[jointType1]);
您不能(只是)使用DrawEllipse方法,因为它将始终绘制水平或垂直椭圆。
使用以下代码实现旋转: https : //stackoverflow.com/a/5298921/1974021并编写一个采用以下输入参数的方法:
椭圆可以通过焦点和(组合)半径来描述。 如果使用焦点,则省略号将在关节处重叠,从而在每个关节处创建一个圆形图案。 那就是你想要的吗? (如果只希望他们触摸关节,这会更加容易)
好的,它实际上不是焦点,而是圆弧的中心。 试试这个方法:
private static void DrawEllipse(Pen pen, Graphics g, PointF pointA, PointF pointB, float radius)
{
var center = new PointF((pointA.X + pointB.X) / 2, (pointA.Y + pointB.Y) / 2);
var distance = GetDistance(pointA, pointB);
// The axis are calculated so that the center of the osculating circles are conincident with the points and has the given radius.
var a = radius + distance / 2; // Semi-major axis
var b = (float)Math.Sqrt(radius * a); // Semi-minor axis
// Angle in degrees
float angle = (float)(Math.Atan2(pointA.Y - pointB.Y, pointA.X - pointB.X) * 180 / Math.PI);
using (Matrix rotate = new Matrix())
{
GraphicsContainer container = g.BeginContainer();
rotate.RotateAt(angle, center);
g.Transform = rotate;
g.DrawEllipse(pen, center.X-a, center.Y-b, 2 * a, 2 * b);
g.EndContainer(container);
}
}
private static float GetDistance(PointF a, PointF b)
{
var dx = a.X - b.X;
var dy = a.Y - b.Y;
return (float)Math.Sqrt(dx * dx + dy * dy);
}
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