public void ScanLineFillEllipse(Graphics graph, Ellipse shape, Color color)
{
int rx = (int) Math.Round(shape.MajorAxis);
int ry = (int)Math.Round(shape.MinorAxis);
var o = Point.Round(shape.OrginalPoint.ToPoint());
var penline = new Pen(color, 1F);
int x = 0, y = ry;
int c1 = 2 * ry * ry * x, c2 = 2 * rx * rx * y;
float p = ry * ry - rx * rx * ry + 0.25F * rx * rx;
while (c1 < c2)
{
Fill2Line(o.X, o.Y, x, y, graph, penline);
x++;
if (p < 0)
{
c1 += 2 * ry * ry;
p += c1 + ry * ry;
}
else
{
y--;
c1 += 2 * ry * ry;
c2 -= 2 * rx * rx;
p += c1 - c2 + ry * ry;
}
}
c1 = 2 * rx * rx * y;
c2 = 2 * ry * ry * x;
p = ry * ry * (x + 0.5F) * (x + 0.5F) + rx * rx * (y - 1) * (y - 1) - rx * rx * ry * ry;
while (y != 0)
{
Fill2Line(o.X, o.Y, x, y, graph, penline);
y--;
if (p > 0)
{
c1 -= 2 * rx * rx;
p += rx * rx - c1;
}
else
{
x++;
c1 -= 2 * rx * rx;
c2 += 2 * ry * ry;
p += c2 - c1 + rx * rx;
}
}
Fill2Line(o.X, o.Y, x, y, graph, penline);
penline.Dispose();
}
private void DrawEllipse(Ellipse ellipse, Graphics graphs)
{
var path = new GraphicsPath();
path.StartFigure();
path.AddEllipse(Util.GetShapeBound(ellipse));
path.CloseFigure();
using (var b = new SolidBrush(ellipse.FillColor))
using (var p = new Pen(ellipse.OutlineColor, ellipse.OutlineWidth))
{
p.DashStyle = ellipse.OutlineDash;
graphs.FillPath(b, path);
//_filler.FillByScanline(graphs, ellipse, ellipse.FillColor);
graphs.DrawPath(p, path);
}
}
public static IDrawingObject ReadDrawingObject(BinaryReader reader)
{
// read object type
IDrawingObject obj = null;
int type = reader.ReadInt32();
switch ((DrawingObjectType)type)
{
case DrawingObjectType.Shape:
{
// read shape type
int shapeType = reader.ReadInt32();
ShapeBase shape;
if ((ShapeType) shapeType == ShapeType.Ellipse)
shape = new Ellipse();
else
shape = new FreePencil();
//var shape = ShapeFactory.CreateShape((ShapeType) shapeType);
// write shape location
shape.Location = ReadPoint(reader);
// write shape size
shape.Size = ReadSize(reader);
// write shape outline color
shape.OutlineColor = ReadColor(reader);
// write shape outline width
shape.OutlineWidth = reader.ReadSingle();
// write shape outline dash
shape.OutlineDash = (DashStyle) reader.ReadInt32();
// write shape fill color
shape.FillColor = ReadColor(reader);
if (shape.GetShapeType() != ShapeType.Ellipse)
{
// write count vertex
var vcount = reader.ReadInt32();
for (int i = 0; i < vcount; i++)
{
Vertex v = ReadVertex(reader);
shape.Vertices.Add(v);
}
}
if (shape.GetShapeType() == ShapeType.Polygon || shape.GetShapeType() == ShapeType.Oblong ||
shape.GetShapeType() == ShapeType.IsoscelesTriangle)
{
var s = shape as PolygonBase;
s.IsClosedFigure = true;
}
}
break;
}
return obj;
}
