public bool IsAbovePoint(PointF point)
{
Line2D line = new Line2D(point, 0.0f, 1.0f);
PointF intersection = this.Intersection(line);
if (intersection != PointF.Empty && intersection.Y > point.Y)
{
return true;
}
else
{
return false;
}
}
public float ValueAtX(float x)
{
Line2D line = new Line2D(new PointF(x, 0.0f), 0.0f, 1.0f);
PointF intersection = this.Intersection(line);
if (intersection != PointF.Empty)
{
return intersection.Y;
}
else
{
return float.NegativeInfinity;
}
}
public Line2D GetNormalLine(PointF point)
{
PointF point2 = new PointF(point.X + VY, point.Y - VX);
Line2D orthoLine = new Line2D(point, point2);
return orthoLine;
}
public abstract PointF Intersection(Line2D line);
public override PointF Intersection(Line2D line)
{
float k;
k = line.VX * VY - line.VY * VX;
if (k == 0) return PointF.Empty;
k = (VY * (Point1.X - line.Point1.X) + VX * (line.Point1.Y - Point1.Y)) / k;
return new PointF(line.Point1.X + k * line.VX, line.Point1.Y + k * line.VY);
}
public override float DistanceTo(PointF point)
{
if (this.Point1 == point || this.Point2 == point)
{
return 0;
}
// Calculate orhogonal line
Line2D orthoLine = this.GetNormalLine(point);
// Calculate Intersection
PointF point3 = new Line2D(this.Point1, this.Point2).Intersection(orthoLine);
if (this.ContainsAbsciss(point3.X))
{
// Calculate the length on the ortho segment
Segment2D segment = new Segment2D(point, point3);
return segment.Length();
}
else
{
Segment2D segment1 = new Segment2D(point, this.Point1);
Segment2D segment2 = new Segment2D(point, this.Point2);
return Math.Min(segment1.Length(), segment2.Length());
}
}
public PointF Intersection(Segment2D segment)
{
Line2D line1 = new Line2D(this.Point1, this.Point2);
Line2D line2 = new Line2D(segment.Point1, segment.Point2);
PointF result = line1.Intersection(line2);
if (result != PointF.Empty)
{
if (!new Rectangle2D(this.Point1, this.Point2).Contains(result) || !new Rectangle2D(segment.Point1, segment.Point2).Contains(result))
{
result = PointF.Empty;
}
}
return result;
}
public override PointF Intersection(Line2D line)
{
float k;
k = line.VX * VY - line.VY * VX;
if (k == 0) return PointF.Empty;
k = (VY * (Point1.X - line.Point1.X) + VX * (line.Point1.Y - Point1.Y)) / k;
PointF intersectionPoint = new PointF(line.Point1.X + k * line.VX, line.Point1.Y + k * line.VY);
if (new Rectangle2D(this.Point1, this.Point2).Contains(intersectionPoint))
{
return intersectionPoint;
}
else
{
return PointF.Empty;
}
}
private void MouseClickDrawing(System.Windows.Forms.MouseEventArgs e, ref PointF mousePoint, ref PointF mouseValuePoint)
{
switch (this.DrawingMode)
{
case GraphDrawMode.AddLine:
switch (this.DrawingStep)
{
case GraphDrawingStep.SelectItem: // Selecting the first point
selectedValuePoint = mouseValuePoint;
this.DrawingStep = GraphDrawingStep.ItemSelected;
break;
case GraphDrawingStep.ItemSelected: // Selecting second point
PointF point1 = selectedValuePoint;
PointF point2 = mouseValuePoint;
try
{
Line2D newLine = new Line2D(point1, point2, this.DrawingPen);
drawingItems.Add(newLine);
AddToUndoBuffer(GraphActionType.AddItem, newLine);
this.DrawingStep = GraphDrawingStep.SelectItem;
this.BackgroundDirty = true; // The new line becomes a part of the background
selectedLineIndex = -1;
}
catch (System.ArithmeticException)
{
}
break;
default: // Shouldn't come there
break;
}
break;
case GraphDrawMode.AddSegment:
switch (this.DrawingStep)
{
case GraphDrawingStep.SelectItem: // Selecting the first point
selectedValuePoint = mouseValuePoint;
this.DrawingStep = GraphDrawingStep.ItemSelected;
break;
case GraphDrawingStep.ItemSelected: // Selecting second point
PointF point1 = selectedValuePoint;
PointF point2 = mouseValuePoint;
try
{
Segment2D newSegment = new Segment2D(point1, point2, this.DrawingPen);
drawingItems.Add(newSegment);
AddToUndoBuffer(GraphActionType.AddItem, newSegment);
this.DrawingStep = GraphDrawingStep.SelectItem;
this.BackgroundDirty = true; // The new line becomes a part of the background
selectedLineIndex = -1;
}
catch (System.ArithmeticException)
{
}
break;
default: // Shouldn't come there
break;
}
break;
case GraphDrawMode.AddHalfLine:
switch (this.DrawingStep)
{
case GraphDrawingStep.SelectItem: // Selecting the first point
selectedValuePoint = mouseValuePoint;
this.DrawingStep = GraphDrawingStep.ItemSelected;
break;
case GraphDrawingStep.ItemSelected: // Selecting second point
PointF point1 = selectedValuePoint;
PointF point2 = mouseValuePoint;
try
{
HalfLine2D newhalfLine = new HalfLine2D(point1, point2, this.DrawingPen);
drawingItems.Add(newhalfLine);
AddToUndoBuffer(GraphActionType.AddItem, newhalfLine);
this.DrawingStep = GraphDrawingStep.SelectItem;
this.BackgroundDirty = true; // The new line becomes a part of the background
selectedLineIndex = -1;
}
catch (System.ArithmeticException)
{
}
break;
default: // Shouldn't come there
break;
}
break;
case GraphDrawMode.FanLine:
switch (this.DrawingStep)
{
case GraphDrawingStep.SelectItem: // Selecting the first point
selectedValuePoint = mouseValuePoint;
this.DrawingStep = GraphDrawingStep.ItemSelected;
break;
case GraphDrawingStep.ItemSelected: // Selecting second point
PointF point1 = selectedValuePoint;
PointF point2 = mouseValuePoint;
try
{
Line2D newLine = (Line2D)new Line2D(point1, point2, this.DrawingPen);
drawingItems.Add(newLine);
AddToUndoBuffer(GraphActionType.AddItem, newLine);
this.BackgroundDirty = true; // The new line becomes a part of the background
selectedLineIndex = -1;
}
catch (System.ArithmeticException)
{
}
break;
default: // Shouldn't come there
break;
}
break;
case GraphDrawMode.AndrewPitchFork:
switch (this.DrawingStep)
{
case GraphDrawingStep.SelectItem: // Selecting the first point
if (andrewPitchFork == null)
{
andrewPitchFork = new AndrewPitchFork(mouseValuePoint, PointF.Empty, PointF.Empty);
}
else
{
// Selecting second point
andrewPitchFork.Point2 = mouseValuePoint;
this.DrawingStep = GraphDrawingStep.ItemSelected;
}
break;
case GraphDrawingStep.ItemSelected: // Selecting third point
andrewPitchFork.Point3 = mouseValuePoint;
try
{
foreach (Line2DBase newLine in andrewPitchFork.GetLines(this.DrawingPen))
{
drawingItems.Add(newLine);
AddToUndoBuffer(GraphActionType.AddItem, newLine);
}
this.BackgroundDirty = true; // The new line becomes a part of the background
selectedLineIndex = -1;
this.DrawingStep = GraphDrawingStep.SelectItem;
andrewPitchFork = null;
}
catch (System.ArithmeticException)
{
}
break;
default: // Shouldn't come there
break;
}
break;
case GraphDrawMode.CopyLine:
switch (this.DrawingStep)
{
case GraphDrawingStep.SelectItem: // Select the line to copy
selectedLineIndex = FindClosestLine(mousePoint);
if (selectedLineIndex != -1)
{
this.DrawingStep = GraphDrawingStep.ItemSelected;
}
break;
case GraphDrawingStep.ItemSelected: // Create new // line
if (selectedLineIndex != -1)
{
Line2D newLine = ((Line2DBase)this.drawingItems[selectedLineIndex]).GetParallelLine(mouseValuePoint);
newLine.Pen = this.DrawingPen;
drawingItems.Add(newLine);
AddToUndoBuffer(GraphActionType.AddItem, newLine);
this.DrawingStep = GraphDrawingStep.SelectItem;
selectedLineIndex = -1;
this.BackgroundDirty = true; // The new line becomes a part of the background
HighlightClosestLine(e);
}
break;
default: // Shouldn't come there
break;
}
break;
case GraphDrawMode.DeleteItem:
switch (this.DrawingStep)
{
case GraphDrawingStep.SelectItem: // Delete element
selectedLineIndex = FindClosestLine(mousePoint);
if (selectedLineIndex != -1)
{
DrawingItem removeLine = this.drawingItems.ElementAt(selectedLineIndex);
this.drawingItems.RemoveAt(selectedLineIndex);
AddToUndoBuffer(GraphActionType.DeleteItem, removeLine);
this.BackgroundDirty = true; // New to redraw the background
HighlightClosestLine(e);
}
break;
default: // Shouldn't come there
break;
}
break;
case GraphDrawMode.CutLine:
if (this.DrawingStep == GraphDrawingStep.SelectItem)
{
selectedLineIndex = FindClosestLine(mousePoint);
if (selectedLineIndex != -1) // #### Check if visible to avoid cutting out of scope items
{
Line2DBase itemToCut = (Line2DBase)this.drawingItems.ElementAt(selectedLineIndex);
Line2DBase cutItem = itemToCut.Cut(mouseValuePoint.X, (Control.ModifierKeys & Keys.Control) == 0);
if (cutItem != null)
{
this.drawingItems.RemoveAt(selectedLineIndex);
this.drawingItems.Add(cutItem);
AddToUndoBuffer(GraphActionType.CutItem, itemToCut, cutItem);
this.BackgroundDirty = true; // New to redraw the background
HighlightCutLine(e, mouseValuePoint, (Control.ModifierKeys & Keys.Control) == 0);
}
}
}
break;
default:
break;
}
}