/// <summary>
/// Initializes a new instance of the <see cref="EllipseGeometry"/> class.
/// </summary>
/// <param name="rect">The rectangle that the ellipse should fill.</param>
public EllipseGeometry(Rect rect)
{
IPlatformRenderInterface factory = PerspexLocator.Current.GetService <IPlatformRenderInterface>();
IStreamGeometryImpl impl = factory.CreateStreamGeometry();
using (IStreamGeometryContextImpl ctx = impl.Open())
{
double controlPointRatio = (Math.Sqrt(2) - 1) * 4 / 3;
var center = rect.Center;
var radius = new Vector(rect.Width / 2, rect.Height / 2);
var x0 = center.X - radius.X;
var x1 = center.X - (radius.X * controlPointRatio);
var x2 = center.X;
var x3 = center.X + (radius.X * controlPointRatio);
var x4 = center.X + radius.X;
var y0 = center.Y - radius.Y;
var y1 = center.Y - (radius.Y * controlPointRatio);
var y2 = center.Y;
var y3 = center.Y + (radius.Y * controlPointRatio);
var y4 = center.Y + radius.Y;
ctx.BeginFigure(new Point(x2, y0), true);
ctx.BezierTo(new Point(x3, y0), new Point(x4, y1), new Point(x4, y2));
ctx.BezierTo(new Point(x4, y3), new Point(x3, y4), new Point(x2, y4));
ctx.BezierTo(new Point(x1, y4), new Point(x0, y3), new Point(x0, y2));
ctx.BezierTo(new Point(x0, y1), new Point(x1, y0), new Point(x2, y0));
ctx.EndFigure(true);
}
PlatformImpl = impl;
}
/// <summary>
/// Initializes a new instance of the <see cref="LineGeometry"/> class.
/// </summary>
/// <param name="startPoint">The start point.</param>
/// <param name="endPoint">The end point.</param>
public LineGeometry(Point startPoint, Point endPoint)
{
_startPoint = startPoint;
_endPoint = endPoint;
IPlatformRenderInterface factory = AvaloniaLocator.Current.GetService <IPlatformRenderInterface>();
IStreamGeometryImpl impl = factory.CreateStreamGeometry();
using (IStreamGeometryContextImpl context = impl.Open())
{
context.BeginFigure(_startPoint, false);
context.LineTo(_endPoint);
context.EndFigure(false);
}
PlatformImpl = impl;
}
public RectangleGeometry(Rect rect)
{
IPlatformRenderInterface factory = Locator.Current.GetService <IPlatformRenderInterface>();
IStreamGeometryImpl impl = factory.CreateStreamGeometry();
using (IStreamGeometryContextImpl context = impl.Open())
{
context.BeginFigure(rect.TopLeft, true);
context.LineTo(rect.TopRight);
context.LineTo(rect.BottomRight);
context.LineTo(rect.BottomLeft);
context.EndFigure(true);
}
this.PlatformImpl = impl;
}
public PolylineGeometry(IList <Point> points, bool isFilled)
{
_points = points;
_isFilled = isFilled;
IPlatformRenderInterface factory = PerspexLocator.Current.GetService <IPlatformRenderInterface>();
IStreamGeometryImpl impl = factory.CreateStreamGeometry();
using (IStreamGeometryContextImpl context = impl.Open())
{
if (points.Count > 0)
{
context.BeginFigure(points[0], isFilled);
for (int i = 1; i < points.Count; i++)
{
context.LineTo(points[i]);
}
context.EndFigure(isFilled);
}
}
PlatformImpl = impl;
}
/// <summary>
/// Ends the figure started by <see cref="BeginFigure(Point, bool)"/>.
/// </summary>
/// <param name="isClosed">Whether the figure is closed.</param>
public void EndFigure(bool isClosed)
{
_impl.EndFigure(isClosed);
}