/// <summary>
///
/// </summary>
/// <param name="arc"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static Rect2 GetArcBounds(XArc arc, double dx, double dy)
{
double x1 = arc.Point1.X + dx;
double y1 = arc.Point1.Y + dy;
double x2 = arc.Point2.X + dx;
double y2 = arc.Point2.Y + dy;
double x0 = (x1 + x2) / 2.0;
double y0 = (y1 + y2) / 2.0;
double r = Math.Sqrt((x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0));
double x = x0 - r;
double y = y0 - r;
double width = 2.0 * r;
double height = 2.0 * r;
return new Rect2(x, y, width, height);
}
/// <summary>
///
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
public override void LeftDown(double x, double y)
{
double sx = _editor.Project.Options.SnapToGrid ? Editor.Snap(x, _editor.Project.Options.SnapX) : x;
double sy = _editor.Project.Options.SnapToGrid ? Editor.Snap(y, _editor.Project.Options.SnapY) : y;
switch (_currentState)
{
case State.None:
{
_connectedP3 = false;
_connectedP4 = false;
_shape = XArc.Create(
sx, sy,
_editor.Project.CurrentStyleLibrary.CurrentStyle,
_editor.Project.Options.PointShape,
_editor.Project.Options.DefaultIsStroked,
_editor.Project.Options.DefaultIsFilled);
if (_editor.Project.Options.TryToConnect)
{
TryToConnectPoint1(_shape, sx, sy);
}
_editor.Project.CurrentContainer.WorkingLayer.Invalidate();
ToStateOne();
Move(_shape);
_editor.Project.CurrentContainer.HelperLayer.Invalidate();
_currentState = State.One;
_editor.CancelAvailable = true;
}
break;
case State.One:
{
if (_shape != null)
{
_shape.Point2.X = sx;
_shape.Point2.Y = sy;
_shape.Point3.X = sx;
_shape.Point3.Y = sy;
if (_editor.Project.Options.TryToConnect)
{
TryToConnectPoint2(_shape, sx, sy);
}
_editor.Project.CurrentContainer.WorkingLayer.Invalidate();
ToStateTwo();
Move(_shape);
_editor.Project.CurrentContainer.HelperLayer.Invalidate();
_currentState = State.Two;
}
}
break;
case State.Two:
{
if (_shape != null)
{
_shape.Point3.X = sx;
_shape.Point3.Y = sy;
_shape.Point4.X = sx;
_shape.Point4.Y = sy;
if (_editor.Project.Options.TryToConnect)
{
_connectedP3 = TryToConnectPoint3(_shape, sx, sy);
}
_editor.Project.CurrentContainer.WorkingLayer.Shapes = _editor.Project.CurrentContainer.WorkingLayer.Shapes.Add(_shape);
_editor.Project.CurrentContainer.WorkingLayer.Invalidate();
ToStateThree();
Move(_shape);
_editor.Project.CurrentContainer.HelperLayer.Invalidate();
_currentState = State.Three;
}
}
break;
case State.Three:
{
if (_shape != null)
{
_shape.Point4.X = sx;
_shape.Point4.Y = sy;
if (_editor.Project.Options.TryToConnect)
{
_connectedP4 = TryToConnectPoint4(_shape, sx, sy);
}
_editor.Project.CurrentContainer.WorkingLayer.Shapes = _editor.Project.CurrentContainer.WorkingLayer.Shapes.Remove(_shape);
Remove();
Finalize(_shape);
_editor.AddWithHistory(_shape);
_currentState = State.None;
_editor.CancelAvailable = false;
}
}
break;
}
}
/// <summary>
///
/// </summary>
/// <param name="arc"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public bool TryToConnectPoint4(XArc arc, double x, double y)
{
var result = ShapeBounds.HitTest(_editor.Project.CurrentContainer, new Vector2(x, y), _editor.Project.Options.HitTreshold);
if (result != null && result is XPoint)
{
arc.Point4 = result as XPoint;
return true;
}
return false;
}
/// <summary>
///
/// </summary>
/// <param name="dc"></param>
/// <param name="arc"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <param name="db"></param>
/// <param name="r"></param>
public void Draw(object dc, XArc arc, double dx, double dy, ImmutableArray<ShapeProperty> db, Record r)
{
var _dc = dc as DrawingContext;
var style = arc.Style;
if (style == null)
return;
double thickness = style.Thickness / _state.Zoom;
double half = thickness / 2.0;
Tuple<Brush, Pen> cache = null;
Brush fill;
Pen stroke;
if (_enableStyleCache
&& _styleCache.TryGetValue(style, out cache))
{
fill = cache.Item1;
stroke = cache.Item2;
}
else
{
fill = CreateBrush(style.Fill);
stroke = CreatePen(style, thickness);
if (_enableStyleCache)
_styleCache.Add(style, Tuple.Create(fill, stroke));
}
var a = WpfArc.FromXArc(arc, dx, dy);
PathGeometry pg = null;
if (_enableArcCache
&& _arcCache.TryGetValue(arc, out pg))
{
var pf = pg.Figures[0];
pf.StartPoint = new Point(a.Start.X, a.Start.Y);
pf.IsFilled = arc.IsFilled;
var segment = pf.Segments[0] as ArcSegment;
segment.Point = new Point(a.End.X, a.End.Y);
segment.Size = new Size(a.Radius.Width, a.Radius.Height);
segment.IsLargeArc = a.IsLargeArc;
segment.IsStroked = arc.IsStroked;
}
else
{
var pf = new PathFigure()
{
StartPoint = new Point(a.Start.X, a.Start.Y),
IsFilled = arc.IsFilled
};
var segment = new ArcSegment(
new Point(a.End.X, a.End.Y),
new Size(a.Radius.Width, a.Radius.Height),
0.0,
a.IsLargeArc, SweepDirection.Clockwise,
arc.IsStroked);
//segment.Freeze();
pf.Segments.Add(segment);
//pf.Freeze();
pg = new PathGeometry();
pg.Figures.Add(pf);
//pg.Freeze();
if (_enableArcCache)
_arcCache.Add(arc, pg);
}
DrawPathGeometryInternal(_dc, half, fill, stroke, arc.IsStroked, arc.IsFilled, pg);
}
/// <summary>
///
/// </summary>
/// <param name="arc"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static GdiArc FromXArc(XArc arc, double dx, double dy)
{
return FromXArc(arc.Point1, arc.Point2, arc.Point3, arc.Point4, dx, dy);
}
/// <summary>
///
/// </summary>
/// <param name="arc"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static WpfArc FromXArc(XArc arc, double dx, double dy)
{
var p1 = Point2.Create(arc.Point1.X + dx, arc.Point1.Y + dy);
var p2 = Point2.Create(arc.Point2.X + dx, arc.Point2.Y + dy);
var p3 = Point2.Create(arc.Point3.X + dx, arc.Point3.Y + dy);
var p4 = Point2.Create(arc.Point4.X + dx, arc.Point4.Y + dy);
var rect = Rect2.Create(p1, p2);
var center = Point2.Create(rect.X + rect.Width / 2.0, rect.Y + rect.Height / 2.0);
double offsetX = center.X - rect.X;
double offsetY = center.Y - rect.Y;
double minLenght = Math.Max(offsetX, offsetY);
double length1 = center.Distance(p3);
double p3x = p3.X + (p3.X - center.X) / length1 * minLenght;
double p3y = p3.Y + (p3.Y - center.Y) / length1 * minLenght;
double length2 = center.Distance(p4);
double p4x = p4.X + (p4.X - center.X) / length2 * minLenght;
double p4y = p4.Y + (p4.Y - center.Y) / length2 * minLenght;
p3.X = p3x;
p3.Y = p3y;
p4.X = p4x;
p4.Y = p4y;
var p3i = MathHelpers.FindEllipseSegmentIntersections(rect, center, p3, true);
var p4i = MathHelpers.FindEllipseSegmentIntersections(rect, center, p4, true);
Point2 start;
Point2 end;
if (p3i.Count == 1)
start = p3i.FirstOrDefault();
else
start = Point2.Create(p3.X, p3.Y);
if (p4i.Count == 1)
end = p4i.FirstOrDefault();
else
end = Point2.Create(p4.X, p4.Y);
double angle = MathHelpers.AngleLineSegments(center, start, center, end);
bool isLargeArc = angle > 180.0;
double helperLenght = 60.0;
double lengthStart = center.Distance(start);
double p3hx = start.X + (start.X - center.X) / lengthStart * helperLenght;
double p3hy = start.Y + (start.Y - center.Y) / lengthStart * helperLenght;
double lengthEnd = center.Distance(end);
double p4hx = end.X + (end.X - center.X) / lengthEnd * helperLenght;
double p4hy = end.Y + (end.Y - center.Y) / lengthEnd * helperLenght;
p3.X = p3hx;
p3.Y = p3hy;
p4.X = p4hx;
p4.Y = p4hy;
return new WpfArc()
{
P1 = p1,
P2 = p2,
P3 = p3,
P4 = p4,
Rect = rect,
Center = center,
Start = start,
End = end,
Radius = Size2.Create(offsetX, offsetY),
IsLargeArc = isLargeArc,
Angle = angle
};
}
/// <summary>
///
/// </summary>
/// <param name="gfx"></param>
/// <param name="arc"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <param name="db"></param>
/// <param name="r"></param>
public void Draw(object gfx, XArc arc, double dx, double dy, ImmutableArray<ShapeProperty> db, Record r)
{
var a = GdiArc.FromXArc(arc, dx, dy);
if (a.Width <= 0.0 || a.Height <= 0.0)
return;
var _gfx = gfx as Graphics;
Brush brush = ToSolidBrush(arc.Style.Fill);
Pen pen = ToPen(arc.Style, _scaleToPage);
if (arc.IsFilled)
{
var path = new GraphicsPath();
path.AddArc(
_scaleToPage(a.X),
_scaleToPage(a.Y),
_scaleToPage(a.Width),
_scaleToPage(a.Height),
(float)a.StartAngle,
(float)a.SweepAngle);
_gfx.FillPath(brush, path);
}
if (arc.IsStroked)
{
_gfx.DrawArc(
pen,
_scaleToPage(a.X),
_scaleToPage(a.Y),
_scaleToPage(a.Width),
_scaleToPage(a.Height),
(float)a.StartAngle,
(float)a.SweepAngle);
}
brush.Dispose();
pen.Dispose();
}
