private void RemoveCircle(Vector2 center, float radius, int count = 40)
{
List <IntPoint> poly = new List <IntPoint>();
float delta = Mathf.PI * 2 / count;
for (int i = 0; i < count; i++)
{
float x = center.x + Mathf.Cos(delta * i) * radius;
float y = center.y + Mathf.Sin(delta * i) * radius;
poly.Add(Convert(x, y));
}
Clipper clipper = new Clipper(Clipper.ioStrictlySimple);
clipper.AddPolygons(m_polys, PolyType.ptSubject);
clipper.AddPolygon(poly, PolyType.ptClip);
clipper.Execute(ClipType.ctDifference, m_polyTree);
Clipper.PolyTreeToPolygons(m_polyTree, m_polys);
Clipper.SimplifyPolygons(m_polys);
List <DelaunayTriangle> triangles = GenerateTriangles();
GenerateMesh(triangles);
}
//---------------------------------------------------------------------------
private void DrawBitmap(bool justClip = false)
{
Cursor.Current = Cursors.WaitCursor;
try
{
if (!justClip)
{
if (rbTest2.Checked)
{
GenerateAustPlusRandomEllipses((int)nudCount.Value);
}
else
{
GenerateRandomPolygon((int)nudCount.Value);
}
}
using (Graphics newgraphic = Graphics.FromImage(mybitmap))
using (GraphicsPath path = new GraphicsPath())
{
newgraphic.SmoothingMode = SmoothingMode.AntiAlias;
newgraphic.Clear(Color.White);
if (rbNonZero.Checked)
{
path.FillMode = FillMode.Winding;
}
//draw subjects ...
foreach (Polygon pg in subjects)
{
PointF[] pts = PolygonToPointFArray(pg, scale);
path.AddPolygon(pts);
pts = null;
}
using (Pen myPen = new Pen(Color.FromArgb(196, 0xC3, 0xC9, 0xCF), (float)0.6))
using (SolidBrush myBrush = new SolidBrush(Color.FromArgb(127, 0xDD, 0xDD, 0xF0)))
{
newgraphic.FillPath(myBrush, path);
newgraphic.DrawPath(myPen, path);
path.Reset();
//draw clips ...
if (rbNonZero.Checked)
{
path.FillMode = FillMode.Winding;
}
foreach (Polygon pg in clips)
{
PointF[] pts = PolygonToPointFArray(pg, scale);
path.AddPolygon(pts);
pts = null;
}
myPen.Color = Color.FromArgb(196, 0xF9, 0xBE, 0xA6);
myBrush.Color = Color.FromArgb(127, 0xFF, 0xE0, 0xE0);
newgraphic.FillPath(myBrush, path);
newgraphic.DrawPath(myPen, path);
//do the clipping ...
if ((clips.Count > 0 || subjects.Count > 0) && !rbNone.Checked)
{
Polygons solution2 = new Polygons();
Clipper c = new Clipper();
c.AddPaths(subjects, PolyType.ptSubject, true);
c.AddPaths(clips, PolyType.ptClip, true);
solution.Clear();
#if UsePolyTree
bool succeeded = c.Execute(GetClipType(), solutionTree, GetPolyFillType(), GetPolyFillType());
//nb: we aren't doing anything useful here with solutionTree except to show
//that it works. Convert PolyTree back to Polygons structure ...
Clipper.PolyTreeToPolygons(solutionTree, solution);
#else
bool succeeded = c.Execute(GetClipType(), solution, GetPolyFillType(), GetPolyFillType());
#endif
if (succeeded)
{
//SaveToFile("solution", solution);
myBrush.Color = Color.Black;
path.Reset();
//It really shouldn't matter what FillMode is used for solution
//polygons because none of the solution polygons overlap.
//However, FillMode.Winding will show any orientation errors where
//holes will be stroked (outlined) correctly but filled incorrectly ...
path.FillMode = FillMode.Winding;
//or for something fancy ...
if (nudOffset.Value != 0)
{
ClipperOffset co = new ClipperOffset();
co.AddPaths(solution, JoinType.jtRound, EndType.etClosedPolygon);
co.Execute(ref solution2, (double)nudOffset.Value * scale);
}
else
{
solution2 = new Polygons(solution);
}
foreach (Polygon pg in solution2)
{
PointF[] pts = PolygonToPointFArray(pg, scale);
if (pts.Count() > 2)
{
path.AddPolygon(pts);
}
pts = null;
}
myBrush.Color = Color.FromArgb(127, 0x66, 0xEF, 0x7F);
myPen.Color = Color.FromArgb(255, 0, 0x33, 0);
myPen.Width = 1.0f;
newgraphic.FillPath(myBrush, path);
newgraphic.DrawPath(myPen, path);
//now do some fancy testing ...
using (Font f = new Font("Arial", 8))
using (SolidBrush b = new SolidBrush(Color.Navy))
{
double subj_area = 0, clip_area = 0, int_area = 0, union_area = 0;
c.Clear();
c.AddPaths(subjects, PolyType.ptSubject, true);
c.Execute(ClipType.ctUnion, solution2, GetPolyFillType(), GetPolyFillType());
foreach (Polygon pg in solution2)
{
subj_area += Clipper.Area(pg);
}
c.Clear();
c.AddPaths(clips, PolyType.ptClip, true);
c.Execute(ClipType.ctUnion, solution2, GetPolyFillType(), GetPolyFillType());
foreach (Polygon pg in solution2)
{
clip_area += Clipper.Area(pg);
}
c.AddPaths(subjects, PolyType.ptSubject, true);
c.Execute(ClipType.ctIntersection, solution2, GetPolyFillType(), GetPolyFillType());
foreach (Polygon pg in solution2)
{
int_area += Clipper.Area(pg);
}
c.Execute(ClipType.ctUnion, solution2, GetPolyFillType(), GetPolyFillType());
foreach (Polygon pg in solution2)
{
union_area += Clipper.Area(pg);
}
using (StringFormat lftStringFormat = new StringFormat())
using (StringFormat rtStringFormat = new StringFormat())
{
lftStringFormat.Alignment = StringAlignment.Near;
lftStringFormat.LineAlignment = StringAlignment.Near;
rtStringFormat.Alignment = StringAlignment.Far;
rtStringFormat.LineAlignment = StringAlignment.Near;
Rectangle rec = new Rectangle(pictureBox1.ClientSize.Width - 108,
pictureBox1.ClientSize.Height - 116, 104, 106);
newgraphic.FillRectangle(new SolidBrush(Color.FromArgb(196, Color.WhiteSmoke)), rec);
newgraphic.DrawRectangle(myPen, rec);
rec.Inflate(new Size(-2, 0));
newgraphic.DrawString("Areas", f, b, rec, rtStringFormat);
rec.Offset(new Point(0, 14));
newgraphic.DrawString("subj: ", f, b, rec, lftStringFormat);
newgraphic.DrawString((subj_area / 100000).ToString("0,0"), f, b, rec, rtStringFormat);
rec.Offset(new Point(0, 12));
newgraphic.DrawString("clip: ", f, b, rec, lftStringFormat);
newgraphic.DrawString((clip_area / 100000).ToString("0,0"), f, b, rec, rtStringFormat);
rec.Offset(new Point(0, 12));
newgraphic.DrawString("intersect: ", f, b, rec, lftStringFormat);
newgraphic.DrawString((int_area / 100000).ToString("0,0"), f, b, rec, rtStringFormat);
rec.Offset(new Point(0, 12));
newgraphic.DrawString("---------", f, b, rec, rtStringFormat);
rec.Offset(new Point(0, 10));
newgraphic.DrawString("s + c - i: ", f, b, rec, lftStringFormat);
newgraphic.DrawString(((subj_area + clip_area - int_area) / 100000).ToString("0,0"), f, b, rec, rtStringFormat);
rec.Offset(new Point(0, 10));
newgraphic.DrawString("---------", f, b, rec, rtStringFormat);
rec.Offset(new Point(0, 10));
newgraphic.DrawString("union: ", f, b, rec, lftStringFormat);
newgraphic.DrawString((union_area / 100000).ToString("0,0"), f, b, rec, rtStringFormat);
rec.Offset(new Point(0, 10));
newgraphic.DrawString("---------", f, b, rec, rtStringFormat);
}
}
} //end if succeeded
} //end if something to clip
pictureBox1.Image = mybitmap;
}
}
}
finally
{
Cursor.Current = Cursors.Default;
}
}
