protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
clicked = true;
dragging = false; // Do not allow direct dragging. Instead, allow dragging only in the sliders.
if (e.Button == MouseButtons.Left)
{
// 20160701
if (moveActive)
{
movePoint = new PointF(e.X, e.Y);
selectedPointInformation = new List <Tuple <int, int> >();
OnAllPointsDeSelected();
Refresh();
}
else
{
if (CheckSelectedPointClicked(e.X, e.Y))
{
selectionClicked = true;
if (dragSplineIndex >= 0) // If not, the user has not clicked on a SELECTED (red) point.
{
dragPoint = new Point(e.X, e.Y);
}
}
else
{
selectionClicked = false;
selecting = true;
selectionCorner1 = new PointF(e.X, e.Y);
selectionCorner2 = new PointF(e.X, e.Y);
// Make sure that selections are only allowed on ONE side of the symmetry axis:
if (selectionSide == SelectionSide.None)
{
float symmetryAxisPlotX = GetPlotXAtX(bezierCurve.SplineList[0].ControlPointList[0].CoordinateList[0]);
if (selectionCorner1.X <= symmetryAxisPlotX)
{
selectionSide = SelectionSide.Left;
}
else
{
selectionSide = SelectionSide.Right;
}
}
else
{
SelectionSide attemptedSelectionSide = SelectionSide.None;
float symmetryAxisPlotX = GetPlotXAtX(bezierCurve.SplineList[0].ControlPointList[0].CoordinateList[0]);
if (selectionCorner1.X <= symmetryAxisPlotX)
{
attemptedSelectionSide = SelectionSide.Left;
}
else
{
attemptedSelectionSide = SelectionSide.Right;
}
if (attemptedSelectionSide != selectionSide)
{
selecting = false;
}
}
}
}
}
else
{
if (CheckDeSelection(e.X, e.Y))
{
Refresh();
}
else
{
selectionClicked = false;
selectedPointInformation = new List <Tuple <int, int> >();
selectionSide = SelectionSide.None;
OnAllPointsDeSelected();
Refresh();
}
}
}
private Boolean CheckDeSelection(float pixelX, float pixelY)
{
Boolean selectionChanged = false;
if (bezierCurve == null)
{
return(selectionChanged);
}
int splineIndex = -1;
int controlPointIndex = -1;
int splineIndex2 = -1;
int controlPointIndex2 = -1;
double minimumDistance = double.MaxValue;
for (int ii = 0; ii < bezierCurve.SplineList.Count; ii++)
{
for (int jj = 0; jj < bezierCurve.SplineList[ii].ControlPointList.Count; jj++)
{
float plotX = GetPlotXAtX(bezierCurve.SplineList[ii].ControlPointList[jj].CoordinateList[0]);
double plotY = GetPlotYAtY(bezierCurve.SplineList[ii].ControlPointList[jj].CoordinateList[1]);
double distanceSquared = (pixelX - plotX) * (pixelX - plotX) + (pixelY - plotY) * (pixelY - plotY);
if (distanceSquared < minimumDistance)
{
minimumDistance = distanceSquared;
splineIndex = ii;
controlPointIndex = jj;
}
}
}
if (minimumDistance < clickTolerance)
{
// Find the underlying point from the connected spline, if any
selectionChanged = true;
if (controlPointIndex == 0)
{
splineIndex2 = splineIndex - 1;
if (splineIndex2 < 0)
{
splineIndex2 = bezierCurve.SplineList.Count - 1;
}
controlPointIndex2 = 3;
}
else if (controlPointIndex == 3)
{
splineIndex2 = (splineIndex + 1) % bezierCurve.SplineList.Count;
controlPointIndex2 = 0;
}
int selectionIndex = selectedPointInformation.FindIndex(t => (t.Item1 == splineIndex) && (t.Item2 == controlPointIndex));
if (selectionIndex >= 0) // select the point and any underlying points (from the next or previous spline)
{
selectionClicked = false;
selectedPointInformation.RemoveAt(selectionIndex);
if (splineIndex2 >= 0)
{
int selectionIndex2 = selectedPointInformation.FindIndex(t => (t.Item1 == splineIndex2) && (t.Item2 == controlPointIndex2));
selectedPointInformation.RemoveAt(selectionIndex2);
}
}
}
if (selectedPointInformation.Count == 0)
{
OnAllPointsDeSelected();
selectionSide = SelectionSide.None;
}
return(selectionChanged);
}
