public void Update(Size finalSize, Thickness borderThickness, CornerRadius cornerRadius)
{
if (borderThickness.IsUniform && cornerRadius.IsUniform)
{
_backgroundGeometryCache = null;
_borderGeometryCache = null;
_useComplexRendering = false;
}
else
{
_useComplexRendering = true;
var boundRect = new Rect(finalSize);
var innerRect = boundRect.Deflate(borderThickness);
var innerCoordinates = new BorderCoordinates(cornerRadius, borderThickness, false);
StreamGeometry backgroundGeometry = null;
if (innerRect.Width != 0 && innerRect.Height != 0)
{
backgroundGeometry = new StreamGeometry();
using (var ctx = backgroundGeometry.Open())
{
CreateGeometry(ctx, innerRect, innerCoordinates);
}
_backgroundGeometryCache = backgroundGeometry;
}
else
{
_backgroundGeometryCache = null;
}
if (boundRect.Width != 0 && innerRect.Height != 0)
{
var outerCoordinates = new BorderCoordinates(cornerRadius, borderThickness, true);
var borderGeometry = new StreamGeometry();
using (var ctx = borderGeometry.Open())
{
CreateGeometry(ctx, boundRect, outerCoordinates);
if (backgroundGeometry != null)
{
CreateGeometry(ctx, innerRect, innerCoordinates);
}
}
_borderGeometryCache = borderGeometry;
}
else
{
_borderGeometryCache = null;
}
}
}
private static void CreateGeometry(StreamGeometryContext context, Rect boundRect, BorderCoordinates borderCoordinates)
{
var topLeft = new Point(borderCoordinates.LeftTop, 0);
var topRight = new Point(boundRect.Width - borderCoordinates.RightTop, 0);
var rightTop = new Point(boundRect.Width, borderCoordinates.TopRight);
var rightBottom = new Point(boundRect.Width, boundRect.Height - borderCoordinates.BottomRight);
var bottomRight = new Point(boundRect.Width - borderCoordinates.RightBottom, boundRect.Height);
var bottomLeft = new Point(borderCoordinates.LeftBottom, boundRect.Height);
var leftBottom = new Point(0, boundRect.Height - borderCoordinates.BottomLeft);
var leftTop = new Point(0, borderCoordinates.TopLeft);
if (topLeft.X > topRight.X)
{
var scaledX = borderCoordinates.LeftTop / (borderCoordinates.LeftTop + borderCoordinates.RightTop) * boundRect.Width;
topLeft = new Point(scaledX, topLeft.Y);
topRight = new Point(scaledX, topRight.Y);
}
if (rightTop.Y > rightBottom.Y)
{
var scaledY = borderCoordinates.TopRight / (borderCoordinates.TopRight + borderCoordinates.BottomRight) * boundRect.Height;
rightTop = new Point(rightTop.X, scaledY);
rightBottom = new Point(rightBottom.X, scaledY);
}
if (bottomRight.X < bottomLeft.X)
{
var scaledX = borderCoordinates.LeftBottom / (borderCoordinates.LeftBottom + borderCoordinates.RightBottom) * boundRect.Width;
bottomRight = new Point(scaledX, bottomRight.Y);
bottomLeft = new Point(scaledX, bottomLeft.Y);
}
if (leftBottom.Y < leftTop.Y)
{
var scaledY = borderCoordinates.TopLeft / (borderCoordinates.TopLeft + borderCoordinates.BottomLeft) * boundRect.Height;
leftBottom = new Point(leftBottom.X, scaledY);
leftTop = new Point(leftTop.X, scaledY);
}
var offset = new Vector(boundRect.TopLeft.X, boundRect.TopLeft.Y);
topLeft += offset;
topRight += offset;
rightTop += offset;
rightBottom += offset;
bottomRight += offset;
bottomLeft += offset;
leftBottom += offset;
leftTop += offset;
context.BeginFigure(topLeft, true);
//Top
context.LineTo(topRight);
//TopRight corner
var radiusX = boundRect.TopRight.X - topRight.X;
var radiusY = rightTop.Y - boundRect.TopRight.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(rightTop, new Size(radiusY, radiusY), 0, false, SweepDirection.Clockwise);
}
//Right
context.LineTo(rightBottom);
//BottomRight corner
radiusX = boundRect.BottomRight.X - bottomRight.X;
radiusY = boundRect.BottomRight.Y - rightBottom.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(bottomRight, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise);
}
//Bottom
context.LineTo(bottomLeft);
//BottomLeft corner
radiusX = bottomLeft.X - boundRect.BottomLeft.X;
radiusY = boundRect.BottomLeft.Y - leftBottom.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(leftBottom, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise);
}
//Left
context.LineTo(leftTop);
//TopLeft corner
radiusX = topLeft.X - boundRect.TopLeft.X;
radiusY = leftTop.Y - boundRect.TopLeft.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(topLeft, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise);
}
context.EndFigure(true);
}
