/// <summary>
/// Adds a RoundedRectangle to the Path.
/// </summary>
/// <param name="pathBuilder">CanvasPathBuilder</param>
/// <param name="x">X offset of the TopLeft corner of the RoundedRectangle</param>
/// <param name="y">Y offset of the TopLeft corner of the RoundedRectangle</param>
/// <param name="width">Width of the RoundedRectangle</param>
/// <param name="height">Height of the RoundedRectangle</param>
/// <param name="radiusX">Corner Radius on the x-axis</param>
/// <param name="radiusY">Corner Radius on the y-axis</param>
public static void AddRoundedRectangleFigure(this CanvasPathBuilder pathBuilder, float x, float y, float width,
float height, float radiusX, float radiusY)
{
// Sanitize the width by taking the absolute value
width = Math.Abs(width);
// Sanitize the height by taking the absolute value
height = Math.Abs(height);
var rect = new CanvasRoundRect(x, y, width, height, radiusX, radiusY);
pathBuilder.AddRoundedRectangleFigure(rect, true);
}
/// <summary>
/// Adds a RoundedRectangle to the Path. (To be used internally)
/// </summary>
/// <param name="pathBuilder">CanvasPathBuilder</param>
/// <param name="rect">CanvasRoundRect</param>
/// <param name="raiseException">Flag to indicate whether exception should be raised</param>
internal static void AddRoundedRectangleFigure(this CanvasPathBuilder pathBuilder, CanvasRoundRect rect,
bool raiseException = false)
{
try
{
// Begin path
pathBuilder.BeginFigure(rect.LeftTop);
}
catch (ArgumentException)
{
if (!raiseException)
{
return;
}
// An ArgumentException will be raised if another figure was already begun( and not ended)
// before calling AddPolygonFigure() method.
throw new InvalidOperationException("A call to CanvasPathBuilder.AddRoundedRectangleFigure occurred, " +
"when another figure was already begun. Please call CanvasPathBuilder.EndFigure method, " +
"before calling CanvasPathBuilder.AddRoundedRectangleFigure, to end the previous figure.");
}
// Top line
pathBuilder.AddLine(rect.RightTop);
// Upper-right corners
var radiusX = rect.TopRight.X - rect.RightTop.X;
var radiusY = rect.TopRight.Y - rect.RightTop.Y;
var center = new Vector2(rect.RightTop.X, rect.TopRight.Y);
pathBuilder.AddArc(center, radiusX, radiusY, 3f * Scalar.PiByTwo, Scalar.PiByTwo);
// Right line
pathBuilder.AddLine(rect.BottomRight);
// Lower-right corners
radiusX = rect.BottomRight.X - rect.RightBottom.X;
radiusY = rect.RightBottom.Y - rect.BottomRight.Y;
center = new Vector2(rect.RightBottom.X, rect.BottomRight.Y);
pathBuilder.AddArc(center, radiusX, radiusY, 0f, Scalar.PiByTwo);
// Bottom line
pathBuilder.AddLine(rect.LeftBottom);
// Lower-left corners
radiusX = rect.LeftBottom.X - rect.BottomLeft.X;
radiusY = rect.LeftBottom.Y - rect.BottomLeft.Y;
center = new Vector2(rect.LeftBottom.X, rect.BottomLeft.Y);
pathBuilder.AddArc(center, radiusX, radiusY, Scalar.PiByTwo, Scalar.PiByTwo);
// Left line
pathBuilder.AddLine(rect.TopLeft);
// Upper-left corners
radiusX = rect.LeftTop.X - rect.TopLeft.X;
radiusY = rect.TopLeft.Y - rect.LeftTop.Y;
center = new Vector2(rect.LeftTop.X, rect.TopLeft.Y);
pathBuilder.AddArc(center, radiusX, radiusY, 2f * Scalar.PiByTwo, Scalar.PiByTwo);
// End path
pathBuilder.EndFigure(CanvasFigureLoop.Closed);
}
/// <summary>
/// Adds a Squircle to the Path. (To be used internally)
/// </summary>
/// <param name="pathBuilder">CanvasPathBuilder</param>
/// <param name="rect">CanvasRoundRect</param>
/// <param name="raiseException">Flag to indicate whether exception should be raised</param>
internal static void AddSquircleFigure(this CanvasPathBuilder pathBuilder, CanvasRoundRect rect,
bool raiseException = false)
{
try
{
// Begin path
pathBuilder.BeginFigure(rect.LeftTop);
}
catch (ArgumentException)
{
if (!raiseException)
{
return;
}
// An ArgumentException will be raised if another figure was already begun( and not ended)
// before calling AddPolygonFigure() method.
throw new InvalidOperationException("A call to CanvasPathBuilder.AddSquircleFigure occurred, " +
"when another figure was already begun. Please call CanvasPathBuilder.EndFigure method, " +
"before calling CanvasPathBuilder.AddSquircleFigure, to end the previous figure.");
}
// Top line
pathBuilder.AddLine(rect.RightTop);
// Upper-right corner
var rightTopControlPoint = new Vector2(rect.RightTop.X + ((rect.TopRight.X - rect.RightTop.X) * ControlPointFactor),
rect.RightTop.Y);
var topRightControlPoint = new Vector2(rect.TopRight.X,
rect.TopRight.Y - ((rect.TopRight.Y - rect.RightTop.Y) * ControlPointFactor));
// Top Right Curve
pathBuilder.AddCubicBezier(rightTopControlPoint, topRightControlPoint, rect.TopRight);
// Right line
pathBuilder.AddLine(rect.BottomRight);
// Lower-right corner
var bottomRightControlPoint = new Vector2(rect.BottomRight.X,
rect.BottomRight.Y + ((rect.RightBottom.Y - rect.BottomRight.Y) * ControlPointFactor));
var rightBottomControlPoint = new Vector2(rect.RightBottom.X + ((rect.BottomRight.X - rect.RightBottom.X) * ControlPointFactor),
rect.RightBottom.Y);
// Bottom Right Curve
pathBuilder.AddCubicBezier(bottomRightControlPoint, rightBottomControlPoint, rect.RightBottom);
// Bottom line
pathBuilder.AddLine(rect.LeftBottom);
// Lower-left corner
var leftBottomControlPoint = new Vector2(rect.LeftBottom.X - ((rect.LeftBottom.X - rect.BottomLeft.X) * ControlPointFactor),
rect.LeftBottom.Y);
var bottomLeftControlPoint = new Vector2(rect.BottomLeft.X,
rect.BottomLeft.Y + ((rect.LeftBottom.Y - rect.BottomLeft.Y) * ControlPointFactor));
// Bottom Left Curve
pathBuilder.AddCubicBezier(leftBottomControlPoint, bottomLeftControlPoint, rect.BottomLeft);
// Left line
pathBuilder.AddLine(rect.TopLeft);
// Upper-left corner
var topLeftControlPoint = new Vector2(rect.TopLeft.X,
rect.TopLeft.Y - ((rect.TopLeft.Y - rect.LeftTop.Y) * ControlPointFactor));
var leftTopControlPoint = new Vector2(rect.LeftTop.X - ((rect.LeftTop.X - rect.TopLeft.X) * ControlPointFactor),
rect.LeftTop.Y);
// Top Left Curve
pathBuilder.AddCubicBezier(topLeftControlPoint, leftTopControlPoint, rect.LeftTop);
// End path
pathBuilder.EndFigure(CanvasFigureLoop.Closed);
}
