/// <summary>Builds a BezierContour from a Rectangle.</summary>
/// <param name="rect">The rectangle to build the contour from</param>
/// <param name="radiusTL">The top-left radius of the rectangle</param>
/// <param name="radiusTR">The top-right radius of the rectangle</param>
/// <param name="radiusBR">The bottom-right radius of the rectangle</param>
/// <param name="radiusBL">The bottom-left radius of the rectangle</param>
/// <returns>A BezierContour that follows the rectangle contour</returns>
public static BezierContour BuildRectangleContour(Rect rect, Vector2 radiusTL, Vector2 radiusTR, Vector2 radiusBR, Vector2 radiusBL)
{
var width = rect.size.x;
var height = rect.size.y;
var halfSize = new Vector2(width / 2.0f, height / 2.0f);
radiusTL = Vector2.Max(Vector2.Min(radiusTL, halfSize), Vector2.zero);
radiusTR = Vector2.Max(Vector2.Min(radiusTR, halfSize), Vector2.zero);
radiusBR = Vector2.Max(Vector2.Min(radiusBR, halfSize), Vector2.zero);
radiusBL = Vector2.Max(Vector2.Min(radiusBL, halfSize), Vector2.zero);
var leftSegmentSize = height - (radiusBL.y + radiusTL.y);
var topSegmentSize = width - (radiusTL.x + radiusTR.x);
var rightSegmentSize = height - (radiusBR.y + radiusTR.y);
var bottomSegmentSize = width - (radiusBL.x + radiusBR.x);
var segments = new List <BezierPathSegment>(8);
BezierPathSegment seg;
if (leftSegmentSize > ShapeUtils.Epsilon)
{
seg = MakePathLine(new Vector2(0.0f, radiusTL.y + leftSegmentSize), new Vector2(0.0f, radiusTL.y))[0];
segments.Add(seg);
}
if (radiusTL.magnitude > ShapeUtils.Epsilon)
{
var circleArc = ShapeUtils.MakeArc(Vector2.zero, -Mathf.PI, Mathf.PI / 2.0f, 1.0f);
circleArc = ShapeUtils.TransformBezierPath(circleArc, radiusTL, 0.0f, radiusTL);
segments.Add(circleArc[0]);
}
if (topSegmentSize > ShapeUtils.Epsilon)
{
seg = MakePathLine(new Vector2(radiusTL.x, 0.0f), new Vector2(radiusTL.x + topSegmentSize, 0.0f))[0];
segments.Add(seg);
}
if (radiusTR.magnitude > ShapeUtils.Epsilon)
{
var topRight = new Vector2(width - radiusTR.x, radiusTR.y);
var circleArc = ShapeUtils.MakeArc(Vector2.zero, -Mathf.PI / 2.0f, Mathf.PI / 2.0f, 1.0f);
circleArc = ShapeUtils.TransformBezierPath(circleArc, topRight, 0.0f, radiusTR);
segments.Add(circleArc[0]);
}
if (rightSegmentSize > ShapeUtils.Epsilon)
{
seg = MakePathLine(new Vector2(width, radiusTR.y), new Vector2(width, radiusTR.y + rightSegmentSize))[0];
segments.Add(seg);
}
if (radiusBR.magnitude > ShapeUtils.Epsilon)
{
var bottomRight = new Vector2(width - radiusBR.x, height - radiusBR.y);
var circleArc = ShapeUtils.MakeArc(Vector2.zero, 0.0f, Mathf.PI / 2.0f, 1.0f);
circleArc = ShapeUtils.TransformBezierPath(circleArc, bottomRight, 0.0f, radiusBR);
segments.Add(circleArc[0]);
}
if (bottomSegmentSize > ShapeUtils.Epsilon)
{
seg = MakePathLine(new Vector2(width - radiusBR.x, height), new Vector2(width - (radiusBR.x + bottomSegmentSize), height))[0];
segments.Add(seg);
}
if (radiusBL.magnitude > ShapeUtils.Epsilon)
{
var bottomLeft = new Vector2(radiusBL.x, height - radiusBL.y);
var circleArc = ShapeUtils.MakeArc(Vector2.zero, Mathf.PI / 2.0f, Mathf.PI / 2.0f, 1.0f);
circleArc = ShapeUtils.TransformBezierPath(circleArc, bottomLeft, 0.0f, radiusBL);
segments.Add(circleArc[0]);
}
// Offset segments to position
for (int i = 0; i < segments.Count; ++i)
{
var s = segments[i];
s.P0 += rect.position;
s.P1 += rect.position;
s.P2 += rect.position;
segments[i] = s;
}
return(new BezierContour()
{
Segments = segments.ToArray(), Closed = true
});
}
