private void DrawPolygonClip(PaintEventArgs e)
{
var aPoint1 = new GeoCoordinate(20.0, 20.0, 0.0);
var aPoint2 = new GeoCoordinate(30.0, 200.0, 0.0);
var aPoint3 = new GeoCoordinate(100.0, 300.0, 0.0);
var aPoint4 = new GeoCoordinate(400.0, 350.0, 0.0);
var aPoint5 = new GeoCoordinate(350.0, 150.0, 0.0);
var aPolyline = new GeoPolyline();
aPolyline.addVertex(aPoint1);
aPolyline.addVertex(aPoint2);
aPolyline.addVertex(aPoint3);
aPolyline.addVertex(aPoint4);
aPolyline.addVertex(aPoint5);
aPolyline.close();
var aPolygon = new GeoPolygon();
aPolygon.setPolyline(aPolyline);
DrawPolygon(e, aPolygon, Color.FromArgb(255, 0, 0, 255));
var aNormal = new GeoNormal(1, 1, 0);
var aPlane = new GeoPlane(aNormal, 3.0 * trackBar1.Value + 100.0);
var aClippedPolygon = aPolygon.clip(aPlane);
DrawPolygon(e, aClippedPolygon, Color.FromArgb(255, 255, 0, 0));
}
public static bool IsOnSamePlane(GeoPointsArray3 points, ref GeoPlane plane)
{
if (points.Size() < 4)
{
return(true);
}
int count = points.Size();
int i = 2;
Vector3 p = points[0];
for (; i < count; ++i)
{
p = points[i];
if (!GeoLineUtils.IsPointInLine3(points[0], points[1], ref p))
{
break;
}
}
if (i == count)
{
return(true);
}
plane = GeoPlaneUtils.CreateFromTriangle(points[0], points[1], p);
i = 2;
int c = 2;
for (; i < count; ++i)
{
if (GeoPlaneUtils.IsPointOnPlane(plane.mNormal, plane.mD, points[i]))
{
c++;
}
}
return(c == count);
}
public QHullTrianglePlane(Vector3 a, Vector3 b)
{
Vector3 normal = Vector3.Cross(b - a, Vector3.forward);
normal.Normalize();
float d = -Vector3.Dot(normal, a);
mPlane = new GeoPlane(normal, d);
mVertexPoints = new Vector3[3];
mVertexPoints[0] = a;
mVertexPoints[1] = b;
mVertexPoints[2] = Vector3.zero;
}
public static GeoPointsArray3 BuildConvexHull(GeoPointsArray3 points)
{
points.Distinct();
GeoPlane plane = new GeoPlane(Vector3.zero, 0);
if (IsOnSamePlane(points, ref plane))
{
GeoPointsArray2 point2 = new GeoPointsArray2(GeoPlaneUtils.PlaneTransformLocal(points.mPointArray, plane));
point2 = BuildConvexHull(point2);
return(new GeoPointsArray3(GeoPlaneUtils.PlaneTransformGlobal(point2.mPointArray, plane)));
}
else
{
return(new GeoPointsArray3(QuickHull.BuildHull(points)));
}
}
