| public Snap ( Canguro activeView, Point mousePoint ) : float | ||
| activeView | Canguro | |
| mousePoint | Point | |
| return | float | |
/// <summary>
/// Calculate the intersection point of two coplanar lines
/// Source: http://local.wasp.uwa.edu.au/~pbourke/geometry/lineline3d/
/// </summary>
/// <param name="l1">First LineMagnet</param>
/// <param name="l2">Second LineMagnet</param>
/// <returns>The intersection point magnet or null if none found</returns>
private PointMagnet createIntersection(LineMagnet l1, LineMagnet l2, GraphicView activeView, System.Windows.Forms.MouseEventArgs e)
{
if (l1 != null && l2 != null)
{
float numer, denom;
float d1, d2, d3, d4, d5;
Vector3 p13 = l1.Position - l2.Position;
Vector3 p21 = l1.Direction;
Vector3 p43 = l2.Direction;
d1 = p13.X * p43.X + p13.Y * p43.Y + p13.Z * p43.Z;
d2 = p43.X * p21.X + p43.Y * p21.Y + p43.Z * p21.Z;
d3 = p13.X * p21.X + p13.Y * p21.Y + p13.Z * p21.Z;
d4 = p43.X * p43.X + p43.Y * p43.Y + p43.Z * p43.Z;
d5 = p21.X * p21.X + p21.Y * p21.Y + p21.Z * p21.Z;
denom = d5 * d4 - d2 * d2;
if (Math.Abs(denom) < float.Epsilon)
{
return(null);
}
numer = d1 * d2 - d3 * d4;
float r = numer / denom;
float s = (d1 + d2 * r) / d4;
Vector3 pa = l1.Position + Vector3.Scale(p21, r);
Vector3 pb = l2.Position + Vector3.Scale(p43, s);
if ((pa - pb).Length() > 0.0001)
{
return(null);
}
// Create magnet
PointMagnet intPtMagnet = new PointMagnet(pa,
PointMagnetType.Intersection);
if (intPtMagnet.Snap(activeView, e.Location) < SnapViewDistance)
{
intPtMagnet.RelatedMagnets.Add(l1);
intPtMagnet.RelatedMagnets.Add(l2);
return(intPtMagnet);
}
}
return(null);
}
/// <summary>
/// Method to add a perpendicular point magnet if the mouse is close to where it is
/// </summary>
private PointMagnet addPerpendicularMagnet(LineMagnet lm, PointMagnet pm, float lmDot, GraphicView activeView, System.Windows.Forms.MouseEventArgs e)
{
float r = Vector3.Dot(lm.Direction, pm.Position - lm.Position) / lmDot;
PointMagnet perpPtMagnet = new PointMagnet(lm.Position + Vector3.Scale(lm.Direction, r),
PointMagnetType.Perpendicular);
if (perpPtMagnet.Snap(activeView, e.Location) < SnapViewDistance)
{
perpPtMagnet.RelatedMagnets.Add(pm);
perpPtMagnet.RelatedMagnets.Add(lm);
points.Add(perpPtMagnet);
return(perpPtMagnet);
}
return(null);
}
/// <summary>
/// Method to try to create a midpoint magnet if the mouse is close to one
/// </summary>
/// <param name="lm">The Line Magnet being followed</param>
/// <param name="activeView">The view in which the snap is taking place</param>
/// <param name="e">The MouseEventArgs of the last MouseMove event</param>
/// <returns>The MidPoint magnet or null if none found</returns>
private PointMagnet createMidPoint(LineMagnet lm, GraphicView activeView, System.Windows.Forms.MouseEventArgs e)
{
if (lm == null)
{
return(null);
}
LineElement l;
if ((l = lm.Line) != null)
{
PointMagnet midPtMagnet = new PointMagnet(Vector3.Scale(l.I.Position + l.J.Position, 0.5f),
PointMagnetType.MidPoint);
if (midPtMagnet.Snap(activeView, e.Location) < SnapViewDistance)
{
midPtMagnet.RelatedMagnets.Add(lm);
points.Add(midPtMagnet);
return(midPtMagnet);
}
}
return(null);
}
/// <summary>
/// Method to perform calculations based on the user interaction by
/// moving the mouse
/// </summary>
/// <param name="sender">The object calling this method</param>
/// <param name="e">The Mouse event args</param>
/// <returns>A boolean indicating whether a repaint is necessary</returns>
public bool MouseMove(GraphicView activeView, System.Windows.Forms.MouseEventArgs e)
{
bool ret = true;
paintMagnets.Clear();
pickItems(e);
recalcPrimaryDependant(activeView);
// Check snap to acquired magnets
points.Snap(activeView, e);
lines.Snap(activeView, e);
// Get max snap Magnet (the one closer to the mouse position)
Magnet bestMagnet;
float snap, bestSnap, bestPointSnap = points.GetBestSnap(out bestMagnet);
if (bestMagnet == null)
{
bestSnap = lines.GetBestSnap(out bestMagnet);
}
else
{
bestSnap = bestPointSnap;
}
// Update CurrentLine's positions if mouse moved over any of it's joints (if LineMagnet has a Line)
if (lines.CurrentLine != null && bestMagnet != null && bestMagnet is PointMagnet &&
lines.CurrentLine.Line != null && ((PointMagnet)bestMagnet).Joint != null)
{
Joint newJoint = ((PointMagnet)bestMagnet).Joint;
if (newJoint == lines.CurrentLine.Line.I || newJoint == lines.CurrentLine.Line.J)
{
lines.CurrentLine.Position = newJoint.Position;
}
}
#region Intersection
// Check intersections between LineMagnets. If any, create corresponding Magnet
if (lines.CurrentLine != null && bestMagnet is LineMagnet && bestMagnet != lines.CurrentLine)
{
PointMagnet intersectionMagnet = createIntersection(lines.CurrentLine, bestMagnet as LineMagnet, activeView, e);
if (intersectionMagnet != null)
{
snap = intersectionMagnet.Snap(activeView, e.Location) + SnapEpsilon;
if (snap < SnapViewDistance)
{
// Paint helper line
paintMagnets.Add(bestMagnet);
// Paint intersection
paintMagnets.Add(intersectionMagnet);
}
if (snap < bestPointSnap && snap < EffectiveSnapDistance)
{
bestSnap = snap;
bestMagnet = intersectionMagnet;
}
}
}
#endregion
#region Midpoint
// Create midpoint magnet (if mouse is close to a Line)
foreach (Magnet m in lines)
{
PointMagnet midMagnet = createMidPoint(m as LineMagnet, activeView, e);
if (midMagnet != null)
{
snap = midMagnet.Snap(activeView, e.Location) + SnapEpsilon;
if (snap < bestPointSnap && snap < EffectiveSnapDistance)
{
bestSnap = snap;
bestMagnet = midMagnet;
}
}
}
#endregion
#region Perpendicular point
// Create perpendicular magnets (if mouse is close to a line)
PointMagnet perpMagnet = createPerpendicularMagnet(bestMagnet as LineMagnet, activeView, e);
if (perpMagnet != null)
{
snap = perpMagnet.Snap(activeView, e.Location) + SnapEpsilon;
if (snap < (bestPointSnap - SnapEpsilon) && snap < EffectiveSnapDistance)
{
bestSnap = snap;
bestMagnet = perpMagnet;
}
}
#endregion
#region Interesting Distance
// If following a LineMagnet, then set next interesting distance as a PointMagnet
PointMagnet distMagnet = createInterestingDistance(bestMagnet as LineMagnet, activeView, e);
if (distMagnet != null)
{
snap = distMagnet.Snap(activeView, e.Location) + SnapEpsilon;
if (snap < bestPointSnap)
{
bestSnap = snap;
bestMagnet = distMagnet;
}
}
#endregion
// Choose magnets to paint
if ((bestMagnet is LineMagnet) && (lines.CurrentLine == null))
{
lines.CurrentLine = (LineMagnet)bestMagnet;
}
else if ((bestMagnet != null) && !bestMagnet.Equals(lines.CurrentLine))
{
paintMagnets.Add(bestMagnet);
}
// Set the Magnet to snap to if the user clicks the mouse
snapMagnet = null;
if (bestMagnet != null)
{
if (bestMagnet is PointMagnet && bestMagnet.LastSnapFitness < EffectiveSnapDistance)
{
snapMagnet = bestMagnet;
}
else if (lines.CurrentLine != null)
{
snapMagnet = lines.CurrentLine;
}
else if (bestMagnet is LineMagnet)
{
snapMagnet = bestMagnet;
}
}
else
{
area.Snap(activeView, e.Location);
snapMagnet = (Magnet)area.Clone();
}
// TODO: Probably change the IsActive property to some enum, so as to activate snapping to
// specific objects only (i.e. Joint snapping when CommandServices.GetJoint() is working)
return(ret);
}
/// <summary>
/// Method to try to create a midpoint magnet if the mouse is close to one
/// </summary>
/// <param name="lm">The Line Magnet being followed</param>
/// <param name="activeView">The view in which the snap is taking place</param>
/// <param name="e">The MouseEventArgs of the last MouseMove event</param>
/// <returns>The MidPoint magnet or null if none found</returns>
private PointMagnet createMidPoint(LineMagnet lm, GraphicView activeView, System.Windows.Forms.MouseEventArgs e)
{
if (lm == null) return null;
LineElement l;
if ((l = lm.Line) != null)
{
PointMagnet midPtMagnet = new PointMagnet(Vector3.Scale(l.I.Position + l.J.Position, 0.5f),
PointMagnetType.MidPoint);
if (midPtMagnet.Snap(activeView, e.Location) < SnapViewDistance)
{
midPtMagnet.RelatedMagnets.Add(lm);
points.Add(midPtMagnet);
return midPtMagnet;
}
}
return null;
}
/// <summary>
/// Calculate the intersection point of two coplanar lines
/// Source: http://local.wasp.uwa.edu.au/~pbourke/geometry/lineline3d/
/// </summary>
/// <param name="l1">First LineMagnet</param>
/// <param name="l2">Second LineMagnet</param>
/// <returns>The intersection point magnet or null if none found</returns>
private PointMagnet createIntersection(LineMagnet l1, LineMagnet l2, GraphicView activeView, System.Windows.Forms.MouseEventArgs e)
{
if (l1 != null && l2 != null)
{
float numer, denom;
float d1, d2, d3, d4, d5;
Vector3 p13 = l1.Position - l2.Position;
Vector3 p21 = l1.Direction;
Vector3 p43 = l2.Direction;
d1 = p13.X * p43.X + p13.Y * p43.Y + p13.Z * p43.Z;
d2 = p43.X * p21.X + p43.Y * p21.Y + p43.Z * p21.Z;
d3 = p13.X * p21.X + p13.Y * p21.Y + p13.Z * p21.Z;
d4 = p43.X * p43.X + p43.Y * p43.Y + p43.Z * p43.Z;
d5 = p21.X * p21.X + p21.Y * p21.Y + p21.Z * p21.Z;
denom = d5 * d4 - d2 * d2;
if (Math.Abs(denom) < float.Epsilon)
return null;
numer = d1 * d2 - d3 * d4;
float r = numer / denom;
float s = (d1 + d2 * r) / d4;
Vector3 pa = l1.Position + Vector3.Scale(p21, r);
Vector3 pb = l2.Position + Vector3.Scale(p43, s);
if ((pa - pb).Length() > 0.0001)
return null;
// Create magnet
PointMagnet intPtMagnet = new PointMagnet(pa,
PointMagnetType.Intersection);
if (intPtMagnet.Snap(activeView, e.Location) < SnapViewDistance)
{
intPtMagnet.RelatedMagnets.Add(l1);
intPtMagnet.RelatedMagnets.Add(l2);
return intPtMagnet;
}
}
return null;
}
/// <summary>
/// Method to add a perpendicular point magnet if the mouse is close to where it is
/// </summary>
private PointMagnet addPerpendicularMagnet(LineMagnet lm, PointMagnet pm, float lmDot, GraphicView activeView, System.Windows.Forms.MouseEventArgs e)
{
float r = Vector3.Dot(lm.Direction, pm.Position - lm.Position) / lmDot;
PointMagnet perpPtMagnet = new PointMagnet(lm.Position + Vector3.Scale(lm.Direction, r),
PointMagnetType.Perpendicular);
if (perpPtMagnet.Snap(activeView, e.Location) < SnapViewDistance)
{
perpPtMagnet.RelatedMagnets.Add(pm);
perpPtMagnet.RelatedMagnets.Add(lm);
points.Add(perpPtMagnet);
return perpPtMagnet;
}
return null;
}