private static Rect FindValuePosition(CircleSegment shape, System.Windows.Size size)
{
Vector offset = -(Vector)size / 2;
double angle = shape.Angle;
int numMaxIterations = Math.Max(1, (int)Math.Log(shape.Circle.Radius, 2));
double minimum = 0.5;
double maximum = 1;
double current = minimum;
double fittinRadius = current;
for (int i = 0; i < numMaxIterations; ++i)
{
Rect rect = FindRectangle(shape.Circle, current, angle, offset, size);
if (shape.Contains(rect))
{
maximum = current;
fittinRadius = current;
}
else
{
minimum = current;
}
if (maximum == minimum)
{
break;
}
current = minimum + (maximum - minimum) / 2;
}
return(FindRectangle(shape.Circle, fittinRadius, angle, offset, size));
}
public void TestContains2()
{
var segment = new CircleSegment
{
Circle =
{
Center = new Point(0, 0),
Radius = 5
},
StartAngle = Math.PI,
EndAngle = Math.PI * 1.5
};
segment.Contains(new Rect(0, 0, 0, 0)).Should().BeTrue();
segment.Contains(new Rect(0, -1.1, 1, 1)).Should().BeTrue();
}
public void TestContains4()
{
var segment = new CircleSegment
{
Circle =
{
Radius = 1
},
};
segment.Contains(new Point(0.5, 0.5)).Should().BeFalse();
}
public void TestContains3()
{
var segment = new CircleSegment
{
Circle =
{
Center = new Point(300, 300),
Radius = 200
},
StartAngle = 0,
EndAngle = Math.PI / 2
};
segment.Contains(new Point(250, 350)).Should().BeTrue();
}
public void TestContains1()
{
var segment = new CircleSegment
{
Circle =
{
Center = new Point(0, 0),
Radius = 5
},
StartAngle = Math.PI / 2,
EndAngle = Math.PI
};
segment.Contains(segment.Circle.Center).Should().BeTrue("because a circle segment should contain its center");
segment.Contains(segment.StartPoint).Should().BeTrue("because a circle segment should contain its corners");
segment.Contains(segment.EndPoint).Should().BeTrue("because a circle segment should contain its corners");
segment.Contains(new Point(-2, -2)).Should().BeTrue("because the point lies in the center of the circle segment");
segment.Contains(new Point(-3, -3)).Should().BeTrue("because the point lies in the center of the circle segment");
segment.Contains(new Point(6, 0)).Should().BeFalse();
segment.Contains(new Point(-6, 0)).Should().BeFalse();
segment.Contains(new Point(0, 6)).Should().BeFalse();
segment.Contains(new Point(0, -6)).Should().BeFalse();
segment.Contains(new Point(2, 2)).Should().BeFalse("because the point lies in the wrong slice of the circle");
segment.Contains(new Point(-2, 2)).Should().BeFalse("because the point lies in the wrong slice of the circle");
segment.Contains(new Point(2, -2)).Should().BeFalse("because the point lies in the wrong slice of the circle");
}