public void ThreePointCircleTest()
{
var a = new Point(0, 0, 0);
var b = new Point(0, 2, 0);
var c = new Point(1, 1, 0);
var circ = PrimitiveEllipse.ThreePointCircle(a, b, c);
Assert.NotNull(circ);
Assert.Equal(new Point(0, 1, 0), circ.Center);
Assert.Equal(Vector.XAxis, circ.MajorAxis);
Assert.Equal(Vector.ZAxis, circ.Normal);
}
public async Task <bool> Execute(IWorkspace workspace, object arg)
{
Entity circle = null;
var drawingPlane = workspace.DrawingPlane;
var cen = await workspace.InputService.GetPoint(new UserDirective("Select center, [ttr], or [th]ree-point", "ttr", "th"));
if (cen.Cancel)
{
return(false);
}
if (cen.HasValue)
{
var mode = CircleMode.Radius;
while (circle == null)
{
switch (mode)
{
case CircleMode.Radius:
{
var rad = await workspace.InputService.GetPoint(new UserDirective("Enter radius or [d]iameter/[i]sometric", "d", "i"), (p) =>
{
return(new IPrimitive[]
{
new PrimitiveLine(cen.Value, p),
new PrimitiveEllipse(cen.Value, (p - cen.Value).Length, drawingPlane.Normal)
});
});
if (rad.Cancel)
{
return(false);
}
if (rad.HasValue)
{
circle = new Circle(cen.Value, (rad.Value - cen.Value).Length, drawingPlane.Normal);
}
else // switch modes
{
if (rad.Directive == null)
{
return(false);
}
switch (rad.Directive)
{
case "d":
mode = CircleMode.Diameter;
break;
case "i":
mode = CircleMode.Isometric;
break;
}
}
break;
}
case CircleMode.Diameter:
{
var dia = await workspace.InputService.GetPoint(new UserDirective("Enter diameter or [r]adius/[i]sometric", "r", "i"), (p) =>
{
return(new IPrimitive[]
{
new PrimitiveLine(cen.Value, p),
new PrimitiveEllipse(cen.Value, (p - cen.Value).Length, drawingPlane.Normal)
});
});
if (dia.Cancel)
{
return(false);
}
if (dia.HasValue)
{
circle = new Circle(cen.Value, (dia.Value - cen.Value).Length * 0.5, drawingPlane.Normal);
}
else // switch modes
{
if (dia.Directive == null)
{
return(false);
}
switch (dia.Directive)
{
case "r":
mode = CircleMode.Radius;
break;
case "i":
mode = CircleMode.Isometric;
break;
}
}
break;
}
case CircleMode.Isometric:
{
var isoRad = await workspace.InputService.GetPoint(new UserDirective("Enter isometric-radius or [r]adius/[d]iameter", "r", "d"), (p) =>
{
return(new IPrimitive[]
{
new PrimitiveLine(cen.Value, p),
new PrimitiveEllipse(cen.Value,
Vector.SixtyDegrees * (p - cen.Value).Length *MathHelper.SqrtThreeHalves,
drawingPlane.Normal,
IsoMinorRatio,
0.0,
360.0)
});
});
if (isoRad.Cancel)
{
return(false);
}
if (isoRad.HasValue)
{
circle = new Ellipse(cen.Value,
Vector.SixtyDegrees * (isoRad.Value - cen.Value).Length * MathHelper.SqrtThreeHalves,
IsoMinorRatio,
0.0,
360.0,
drawingPlane.Normal);
}
else // switch modes
{
if (isoRad.Directive == null)
{
return(false);
}
switch (isoRad.Directive)
{
case "r":
mode = CircleMode.Radius;
break;
case "d":
mode = CircleMode.Diameter;
break;
}
}
break;
}
}
}
}
else
{
switch (cen.Directive)
{
case "ttr":
var firstEntity = await workspace.InputService.GetEntity(new UserDirective("First entity"));
if (firstEntity.Cancel || !firstEntity.HasValue)
{
break;
}
var secondEntity = await workspace.InputService.GetEntity(new UserDirective("Second entity"));
if (secondEntity.Cancel || !secondEntity.HasValue)
{
break;
}
var radius = await workspace.InputService.GetDistance();
var ellipse = EditUtilities.Ttr(drawingPlane, firstEntity.Value, secondEntity.Value, radius.Value);
if (ellipse != null)
{
circle = ellipse.ToEntity();
}
break;
case "2":
break;
case "th":
var first = await workspace.InputService.GetPoint(new UserDirective("First point"));
if (first.Cancel || !first.HasValue)
{
break;
}
var second = await workspace.InputService.GetPoint(new UserDirective("Second point"), p =>
new[]
{
new PrimitiveLine(first.Value, p)
});
if (second.Cancel || !second.HasValue)
{
break;
}
var third = await workspace.InputService.GetPoint(new UserDirective("Third point"), p =>
{
var c = PrimitiveEllipse.ThreePointCircle(first.Value, second.Value, p);
if (c == null)
{
return new IPrimitive[]
{
new PrimitiveLine(first.Value, second.Value),
new PrimitiveLine(second.Value, p),
new PrimitiveLine(p, first.Value)
}
}
;
else
{
return new IPrimitive[]
{
new PrimitiveLine(first.Value, second.Value),
new PrimitiveLine(second.Value, p),
new PrimitiveLine(p, first.Value),
c
}
};
});
if (third.Cancel || !third.HasValue)
{
break;
}
var circ = PrimitiveEllipse.ThreePointCircle(first.Value, second.Value, third.Value);
if (circ != null)
{
circle = new Circle(circ.Center, circ.MajorAxis.Length, circ.Normal);
}
break;
}
}
if (circle != null)
{
workspace.AddToCurrentLayer(circle);
}
return(true);
}
