void DoDragSelectMouseMove(DTkViewer dv, DPoint pt)
{
// rectangular area to update with paint event
DRect updateRect = new DRect();
// initial update rect
updateRect = figureHandler.SelectionFigure.Rect;
// drag select figure
figureHandler.SelectionFigure.TopLeft = dragPt;
figureHandler.SelectionFigure.BottomRight = pt;
if (figureHandler.SelectionFigure.Width < 0)
{
figureHandler.SelectionFigure.X += figureHandler.SelectionFigure.Width;
figureHandler.SelectionFigure.Width = -figureHandler.SelectionFigure.Width;
}
if (figureHandler.SelectionFigure.Height < 0)
{
figureHandler.SelectionFigure.Y += figureHandler.SelectionFigure.Height;
figureHandler.SelectionFigure.Height = -figureHandler.SelectionFigure.Height;
}
// final update rect
updateRect = updateRect.Union(figureHandler.SelectionFigure.Rect);
// update drawing
dv.Update(updateRect);
}
void ErasePolylines(DPoint eraserPt, IList<Figure> figures, ref DRect updateRect, GroupFigure parent)
{
for (int i = figures.Count - 1; i >= 0; i--)
if (figures[i] is PolylinebaseFigure)
{
PolylinebaseFigure f = (PolylinebaseFigure)figures[i];
DPoint rotPt = f.TransformPointToFigure(eraserPt);
DPoints ptsToRemove = new DPoints();
if (f.Points != null)
foreach (DPoint pt in f.Points)
if (DGeom.PointInCircle(pt, rotPt, figureHandler.EraserFigure.Size / 2))
ptsToRemove.Add(pt);
if (ptsToRemove.Count > 0)
{
// add polyline figure bounding box to updateRect
updateRect = updateRect.Union(GetBoundingBox(f));
if (parent != null)
{
// remove child figure and account for rect changes
DRect oldR = parent.Rect;
ErasePolyline(ptsToRemove, f, parent);
DRect newR = parent.Rect;
DGeom.UpdateRotationPosition(f, oldR, newR);
}
else
ErasePolyline(ptsToRemove, f, parent);
}
}
else if (figures[i] is GroupFigure)
{
GroupFigure f = (GroupFigure)figures[i];
// recurse into group figure and also update rotation position
DRect oldR = f.Rect;
ErasePolylines(f.TransformPointToFigure(eraserPt), f.ChildFigures, ref updateRect, f);
DRect newR = f.Rect;
DGeom.UpdateRotationPosition(f, oldR, newR);
// clean up group figure if no longer needed
if (f.ChildFigures.Count == 1)
figureHandler.UngroupFigure(f);
else if (f.ChildFigures.Count < 1)
figures.Remove(f);
}
}
void DoDragFigureMouseMove(DTkViewer dv, DPoint pt)
{
// rectangular area to update with paint event
DRect updateRect = new DRect();
// move selected figures
switch (mouseHitTest)
{
case DHitTest.Body:
System.Diagnostics.Trace.Assert(currentFigure != null, "currentFigure is null");
// drag figure event
if (DragFigureEvt != null)
DragFigureEvt(null, currentFigure, dv.EngineToClient(pt));
// if figure drag op is cancelled then quit this function
if (cancelledFigureDrag)
{
cancelledFigureDrag = false;
return;
}
// bound pt to canvas
BoundPtToPage(pt);
// initial update rect
updateRect = GetBoundingBox(currentFigure);
foreach (Figure f in figureHandler.SelectedFigures)
updateRect = updateRect.Union(GetBoundingBox(f));
// apply x/y delta to figures
DPoint dPos = CalcDragDelta(pt);
if (gridSnapPosition && grid > 0)
{
DPoint o = GridSnapOffset(currentFigure.X + dPos.X, currentFigure.Y + dPos.Y);
dPos.X += o.X;
dPos.Y += o.Y;
pt.X += o.X;
pt.Y += o.Y;
}
if (dPos.X != 0 || dPos.Y != 0)
foreach (Figure f in figureHandler.SelectedFigures)
if (!f.Locked)
{
f.X += dPos.X;
f.Y += dPos.Y;
}
// store drag pt for reference later (eg. next mousemove event)
dragPt = pt;
// final update rect
foreach (Figure f in figureHandler.SelectedFigures)
updateRect = updateRect.Union(GetBoundingBox(f));
break;
case DHitTest.SelectRect:
goto case DHitTest.Body;
case DHitTest.Resize:
System.Diagnostics.Trace.Assert(currentFigure != null, "currentFigure is null");
// bound pt to canvas
BoundPtToPage(pt);
// alert figure we are going to resize it
currentFigure.BeforeResize();
// inital update rect
updateRect = GetBoundingBox(currentFigure);
// translate point onto the same rotated plane as the figure
pt = currentFigure.RotatePointToFigure(pt);
// apply width/height delta to figure
DPoint dSize = CalcSizeDelta(pt, currentFigure, LockingAspectRatio || currentFigure.LockAspectRatio);
if (lockInitialAspectRatio && !(figureLockAspectRatioMode == DHsmLockAspectRatioMode.Always || currentFigure.LockAspectRatio))
{
DPoint dSizeUnlocked = CalcSizeDelta(pt, currentFigure, false);
if (figureLockAspectRatioMode == DHsmLockAspectRatioMode.Never ||
Math.Abs(dSizeUnlocked.X - dSize.X) >= unlockInitalAspectRatioThreshold ||
Math.Abs(dSizeUnlocked.Y - dSize.Y) >= unlockInitalAspectRatioThreshold)
{
lockInitialAspectRatio = false;
dSize = dSizeUnlocked;
}
}
if (currentFigure.Width > 0 && currentFigure.Width + dSize.X < currentFigure.MinSize)
{
dSize.X = currentFigure.MinSize - currentFigure.Width;
if (LockingAspectRatio || currentFigure.LockAspectRatio)
dSize.Y = (currentFigure.Height / currentFigure.Width) * dSize.X;
}
if (currentFigure.Height > 0 && currentFigure.Height + dSize.Y < currentFigure.MinSize)
{
dSize.Y = currentFigure.MinSize - currentFigure.Height;
if (LockingAspectRatio || currentFigure.LockAspectRatio)
dSize.X = (currentFigure.Width / currentFigure.Height) * dSize.Y;
}
DRect oldRect = currentFigure.Rect;
currentFigure.Width += dSize.X;
currentFigure.Height += dSize.Y;
// snap resize
if (gridSnapResize && grid > 0)
{
DPoint o2 = GridSnapOffset(currentFigure.Width, currentFigure.Height);
currentFigure.Width += o2.X;
currentFigure.Height += o2.Y;
}
DGeom.UpdateRotationPosition(currentFigure, oldRect, currentFigure.Rect);
// final update rect
updateRect = updateRect.Union(GetBoundingBox(currentFigure));
// alert figure we have finished resizing
currentFigure.AfterResize();
// debug message
#if DEBUG
DoDebugMessage(string.Format("{0} {1}", dSize.X, dSize.Y));
#endif
break;
case DHitTest.RepositionPoint:
System.Diagnostics.Trace.Assert(currentFigure != null, "currentFigure is null");
// bound pt to canvas
BoundPtToPage(pt);
// inital update rect
updateRect = GetBoundingBox(currentFigure);
// get our reposition point interface
IRepositionPoint rp = (IRepositionPoint)currentFigure;
// setup points
DPoint newPoint;
newPoint = new DPoint(pt.X, pt.Y);
SetPointDelegate setPoint = delegate(DPoint point)
{
// snap point to grid
if (gridSnapLines && grid > 0)
{
DPoint o3 = GridSnapOffset(point.X, point.Y);
point.X += o3.X;
point.Y += o3.Y;
}
// now set point
rp.RepositionPoint = point;
};
GetRotationalSnapDelegate getRotationalSnap = delegate(double angleRemainder)
{
if (angleRemainder < figureSnapRange)
return -angleRemainder;
else if (angleRemainder > figureSnapAngle - figureSnapRange)
return figureSnapAngle - angleRemainder;
else
return 0;
};
if (rp.AnglePoint != null)
{
// find the current angle of the line and the remainder when divided by the snap angle
double currentAngle = DGeom.AngleBetweenPoints(rp.RepositionPoint, rp.AnglePoint);
double ar = currentAngle % figureSnapAngle;
// reposition line
double newAngle;
switch (FigureSnapAngleMode)
{
case DHsmSnapAngleMode.Always:
// slide point along snap angle
newAngle = DGeom.AngleBetweenPoints(newPoint, rp.AnglePoint);
ar = newAngle % figureSnapAngle;
if (ar < figureSnapAngle / 2)
setPoint(DGeom.RotatePoint(newPoint, rp.AnglePoint, -ar));
else
setPoint(DGeom.RotatePoint(newPoint, rp.AnglePoint, figureSnapAngle - ar));
break;
case DHsmSnapAngleMode.Default:
if (ar == 0)
{
// line is snapped, test if new angle will unsnap the line
newAngle = DGeom.AngleBetweenPoints(newPoint, rp.AnglePoint);
ar = newAngle % figureSnapAngle;
if (ar > figureSnapRange && ar < figureSnapAngle - figureSnapRange)
// unsnapped, set new point
setPoint(newPoint);
else
{
// slide point along snap angle
newPoint = DGeom.RotatePoint(newPoint, rp.AnglePoint, getRotationalSnap(ar));
setPoint(newPoint);
}
}
else
{
// set new point
setPoint(newPoint);
// test whether to snap our line
newAngle = DGeom.AngleBetweenPoints(newPoint, rp.AnglePoint);
ar = newAngle % figureSnapAngle;
double rotationalSnap = getRotationalSnap(ar);
// snap it
if (rotationalSnap != 0)
setPoint(DGeom.RotatePoint(newPoint, rp.AnglePoint, rotationalSnap));
}
break;
case DHsmSnapAngleMode.Never:
// set new point
setPoint(newPoint);
break;
}
}
else
setPoint(newPoint);
// final update rect
updateRect = updateRect.Union(GetBoundingBox(currentFigure));
break;
case DHitTest.Rotate:
System.Diagnostics.Trace.Assert(currentFigure != null, "currentFigure is null");
// initial update rect
updateRect = GetBoundingBox(currentFigure);
// apply rotation to figure
double newRot = GetRotationOfPointComparedToFigure(currentFigure, pt) - dragRot;
double r = newRot % figureSnapAngle;
switch (figureSnapAngleMode)
{
case DHsmSnapAngleMode.Always:
if (r < figureSnapAngle / 2)
currentFigure.Rotation = newRot - r;
else
currentFigure.Rotation = newRot + figureSnapAngle - r;
break;
case DHsmSnapAngleMode.Default:
if (r < figureSnapRange)
currentFigure.Rotation = newRot - r;
else if (r > figureSnapAngle - figureSnapRange)
currentFigure.Rotation = newRot + figureSnapAngle - r;
else
currentFigure.Rotation = newRot;
break;
case DHsmSnapAngleMode.Never:
currentFigure.Rotation = newRot;
break;
}
// final update rect
updateRect = updateRect.Union(GetBoundingBox(currentFigure));
#if DEBUG
// debug message
DoDebugMessage((currentFigure.Rotation * 180 / Math.PI).ToString());
#endif
break;
}
// update drawing
dv.Update(updateRect);
}
public DRect BoundingRect(IList<Figure> figs)
{
DRect r = new DRect(0, 0, 0, 0);
if (figs.Count == 1)
{
r = figs[0].Rect;
foreach (Figure f in figs)
r = r.Union(f.Rect);
}
else if (figs.Count > 1)
{
r = DGeom.BoundingBoxOfRotatedRect(figs[0].Rect, figs[0].Rotation);
foreach (Figure f in figs)
r = r.Union(DGeom.BoundingBoxOfRotatedRect(f.Rect, f.Rotation));
}
return r;
}