/// <summary>
/// Transforms the rectangle with the current matrix.
/// </summary>
/// <remarks>
/// This returns a rectangle that encompasses the specified <paramref name="rect"/> after it is translated.
/// When rotating, this means that the new rectangle may be larger in size to encompass the translated rectangle.
/// </remarks>
/// <returns>A new rectangle that encompasses the translated <paramref name="rect"/>.</returns>
/// <param name="matrix">Matrix to transform each point of the rectangle.</param>
/// <param name="rect">Rectangle to transform.</param>
public static RectangleF TransformRectangle(this IMatrix matrix, RectangleF rect)
{
var points = new[]
{
matrix.TransformPoint(rect.TopLeft),
matrix.TransformPoint(rect.TopRight),
matrix.TransformPoint(rect.BottomLeft),
matrix.TransformPoint(rect.BottomRight)
};
return(RectangleF.FromSides(points.Min(r => r.X), points.Min(r => r.Y), points.Max(r => r.X), points.Max(r => r.Y)));
}
/// <summary>
/// Creates a rounded rectangle using the specified corner radius
/// </summary>
/// <param name="rectangle">Rectangle to round</param>
/// <param name="nwRadius">Radius of the north east corner</param>
/// <param name="neRadius">Radius of the north west corner</param>
/// <param name="seRadius">Radius of the south east corner</param>
/// <param name="swRadius">Radius of the south west corner</param>
/// <returns>GraphicsPath with the lines of the rounded rectangle ready to be painted</returns>
public static IGraphicsPath GetRoundRect(RectangleF rectangle, float nwRadius, float neRadius, float seRadius, float swRadius)
{
// NW-----NE
// | |
// | |
// SW-----SE
var result = GraphicsPath.Create();
nwRadius *= 2;
neRadius *= 2;
seRadius *= 2;
swRadius *= 2;
//NW ---- NE
result.AddLine(new PointF(rectangle.X + nwRadius, rectangle.Y), new PointF(rectangle.Right - neRadius, rectangle.Y));
//NE Arc
if (neRadius > 0f)
{
var rect = RectangleF.FromSides(rectangle.Right - neRadius, rectangle.Top, rectangle.Right, rectangle.Top + neRadius);
result.AddArc(rect, -90, 90);
}
// NE
// |
// SE
result.AddLine(new PointF(rectangle.Right, rectangle.Top + neRadius), new PointF(rectangle.Right, rectangle.Bottom - seRadius));
//SE Arc
if (seRadius > 0f)
{
var rect = RectangleF.FromSides(rectangle.Right - seRadius, rectangle.Bottom - seRadius, rectangle.Right, rectangle.Bottom);
result.AddArc(rect, 0, 90);
}
// SW --- SE
result.AddLine(new PointF(rectangle.Right - seRadius, rectangle.Bottom), new PointF(rectangle.Left + swRadius, rectangle.Bottom));
//SW Arc
if (swRadius > 0f)
{
var rect = RectangleF.FromSides(rectangle.Left, rectangle.Bottom - swRadius, rectangle.Left + swRadius, rectangle.Bottom);
result.AddArc(rect, 90, 90);
}
// NW
// |
// SW
result.AddLine(new PointF(rectangle.Left, rectangle.Bottom - swRadius), new PointF(rectangle.Left, rectangle.Top + nwRadius));
//NW Arc
if (nwRadius > 0f)
{
var rect = RectangleF.FromSides(rectangle.Left, rectangle.Top, rectangle.Left + nwRadius, rectangle.Top + nwRadius);
result.AddArc(rect, 180, 90);
}
result.CloseFigure();
return(result);
}
