public void TrackballTrack(double trackX, double trackY)
{
if (!IsTrackBallMode)
{
return;
}
var xDegrees = trackX * TRACKBALL_SPEED;
var yDegrees = trackY * TRACKBALL_SPEED;
var tempRightDirection = Vector3D.CrossProduct(LookDirection, UpDirection).Normalized();
var tempUpDirection = UpDirection;
var tempPosition = (Vector3D)Position;
// perform rotation of xDegrees around "up" axis
tempPosition = RotationHelper.RotateVector(tempPosition, tempUpDirection, xDegrees);
tempRightDirection = RotationHelper.RotateVector(tempRightDirection, tempUpDirection, xDegrees);
// perform rotation of yDegrees around left/right axis
tempPosition = RotationHelper.RotateVector(tempPosition, tempRightDirection, yDegrees);
tempUpDirection = RotationHelper.RotateVector(tempUpDirection, tempRightDirection, yDegrees);
UpDirection = tempUpDirection;
Position = (Point3D)tempPosition;
LookDirection = -tempPosition.Normalized();
}
protected Vector3D TrackballRotate(Vector3D toRotate, Vector dragVector2d)
{
const double TRACKBALL_ROTATE_SPEED = 0.5;
var horzDegrees = -dragVector2d.X * TRACKBALL_ROTATE_SPEED;
var vertDegrees = -dragVector2d.Y * TRACKBALL_ROTATE_SPEED;
var horzAxis = SketchPlane.Normal;
var vertAxis = SketchPlane.XAxis;
toRotate = RotationHelper.RotateVector(toRotate, horzAxis, horzDegrees);
toRotate = RotationHelper.RotateVector(toRotate, vertAxis, vertDegrees);
return toRotate;
}
private void OnTestCase(object ignore)
{
// data from which the cylinder and its curve representations will be created
var axis = RotationHelper.RotateVector(MathUtils3D.UnitY, MathUtils3D.UnitX, -20);
var center = MathUtils3D.Origin;
var radius = 0.2;
var halfLength = 0.3;
// basis vectors for the cylinder top/bottom planes
var xBase = MathUtils3D.NormalVector(axis);
var yBase = Vector3D.CrossProduct(xBase, axis);
// generators for the top/bottom circles.
var topGenerator = new PolarPointsGenerator(center + halfLength * axis, xBase, yBase);
var bottomGenerator = new PolarPointsGenerator(center - halfLength * axis, xBase, yBase);
// angles to use for circles generation.
const int COUNT = 50;
var angles =
from i in Enumerable.Range(0, COUNT)
select 2 * Math.PI * i / COUNT;
// generate top/bottom circles in 3D
var topCircle3d =
from angle in angles
select topGenerator.GetPoint(angle, radius);
var bottomCircle3d =
from angle in angles
select bottomGenerator.GetPoint(angle, radius);
// generate the left line from top to bottom
var leftLine3d =
from i in Enumerable.Range(0, COUNT)
let top = topGenerator.GetPoint(0, radius)
let bottom = bottomGenerator.GetPoint(0, radius)
let fraction = i / (double)(COUNT - 1)
select MathUtils3D.Lerp(top, bottom, fraction);
// generate right line from top to bottom
var rightLine3d =
from i in Enumerable.Range(0, COUNT)
let top = topGenerator.GetPoint(Math.PI, radius)
let bottom = bottomGenerator.GetPoint(Math.PI, radius)
let fraction = i / (double)(COUNT - 1)
select MathUtils3D.Lerp(top, bottom, fraction);
// project all lines to 2D
var topCircle2d = Project(topCircle3d);
var bottomCircle2d = Project(bottomCircle3d);
var leftLine2d = Project(leftLine3d);
var rightLine2d = Project(rightLine3d);
// generate curve data
var topCurve = new Polygon {
CurveCategory = CurveCategories.Feature, Points = topCircle2d.ToArray()
};
var bottomCurve = new Polygon {
CurveCategory = CurveCategories.Feature, Points = bottomCircle2d.ToArray()
};
var leftCurve = new Polyline {
CurveCategory = CurveCategories.Silhouette, Points = leftLine2d.ToArray()
};
var rightCurve = new Polyline {
CurveCategory = CurveCategories.Silhouette, Points = rightLine2d.ToArray()
};
// generate new primitive that exactly matches the curves
var newcylinder = new NewCylinder();
newcylinder.Axis.Value = axis;
newcylinder.Center.Value = center;
newcylinder.Length.Value = halfLength * 2;
newcylinder.Diameter.Value = radius * 2;
// reset session data
var sketchData =
new SketchData
{
NewPrimitives = new NewPrimitive[] { newcylinder },
Curves = new PointsSequence[] { topCurve, bottomCurve, leftCurve, rightCurve },
SnappedPrimitives = new SnappedPrimitive[0],
Annotations = new Annotation[0],
};
sessionData.SketchData = sketchData;
sessionData.Annotations.Clear();
sessionData.Annotations.AddRange(sketchData.Annotations);
sessionData.NewPrimitives.Clear();
sessionData.NewPrimitives.AddRange(sketchData.NewPrimitives);
sessionData.SketchObjects = sketchData.Curves.ToArray();
sessionData.SnappedPrimitives.Clear();
sessionData.SnappedPrimitives.AddRange(sessionData.SnappedPrimitives);
}