/// <summary>
/// Gets the path representing this element.
/// </summary>
public override VectorPath GetPath(SVGElement context, RenderContext renderer)
{
Css.RenderableData rd = context.RenderData;
// Get w/h:
float width = Width.GetDecimal(rd, ViewportAxis.X);
float height = Height.GetDecimal(rd, ViewportAxis.Y);
if (width <= 0f && height > 0f)
{
return(null);
}
if (_Path == null)
{
_Path = new VectorPath();
// Get corner radius:
float rx = CornerRadiusX.GetDecimal(rd, ViewportAxis.X);
float ry = CornerRadiusY.GetDecimal(rd, ViewportAxis.Y);
// Get x/y:
float x = X.GetDecimal(rd, ViewportAxis.X);
float y = Y.GetDecimal(rd, ViewportAxis.Y);
// Note: This goes clockwise (like the other standard shapes).
// If the corners aren't to be rounded just create a rectangle
if (rx == 0f && ry == 0f)
{
// Ordinary rectangle.
_Path.MoveTo(x, y);
_Path.LineTo(x, y + height);
_Path.LineTo(x + width, y + height);
_Path.LineTo(x + width, y);
_Path.ClosePath();
}
else
{
// Clip the corner radius:
rx = (float)Math.Min(rx * 2, width);
ry = (float)Math.Min(ry * 2, height);
// Get the C values (used to shape the 4 corners arcs - see CircleProvider for some clarity):
float cx = (CircleProvider.BezierC * rx);
float cy = (CircleProvider.BezierC * ry);
float limit = x + width * 0.5f;
// The start/ end of arcs from the left along x.
float leftArcX = Math.Min(x + rx, limit);
// The start/ end of arcs from the right along x.
float rightArcX = Math.Max(x + width - rx, limit);
limit = y + height * 0.5f;
// The start/ end of arcs from the bottom along y.
float bottomArcY = Math.Min(y + ry, limit);
// The start/ end of arcs from the top along y.
float topArcY = Math.Max(y + height - ry, limit);
// Start from bottom left:
_Path.MoveTo(
leftArcX,
y
);
// First arc (bottom left):
_Path.CurveTo(
leftArcX - cx, y,
x, bottomArcY - cy,
x, bottomArcY
);
// Up the left edge:
_Path.LineTo(x, topArcY);
// Top left arc:
_Path.CurveTo(
x, topArcY + cy,
leftArcX - cx, y + height,
leftArcX, y + height
);
// Along the top edge:
_Path.LineTo(rightArcX, y);
// Top right arc:
_Path.CurveTo(
rightArcX + cx, y,
x + width, topArcY + cy,
x + width, topArcY
);
// Down the right edge:
_Path.LineTo(x + width, bottomArcY);
// Bottom right arc:
_Path.CurveTo(
x + width, bottomArcY - cy,
rightArcX + cx, y,
rightArcX, y
);
// Line along the bottom!
_Path.ClosePath();
}
}
return(_Path);
}
