void DrawingPanel_Paint(object sender, GUI.PaintEventArgs e)
{
GUI.Cursor.Current = GUI.Cursors.WaitCursor;
Graphics graphics = e.Graphics;
SmoothingMode fillSmoothingMode = graphics is SoftwareGraphics ? SmoothingMode.AntiAlias : SmoothingMode.None;
SmoothingMode strokeSmoothingMode = SmoothingMode.AntiAlias;
graphics.SmoothingMode = fillSmoothingMode;
graphics.Clear(Color.White);
GraphicsPath path = new GraphicsPath();
if (rbNonZero.IsChecked)
{
path.FillMode = FillMode.Winding;
}
//draw subjects ...
foreach (Polygon pg in subjects)
{
Point[] pts = PolygonToPointArray(pg, scale);
path.AddPolygon(pts);
pts = null;
}
Pen myPen = new Pen(
//Color.FromArgb(196, 0xC3, 0xC9, 0xCF),
Color.FromArgb(128, 0, 0, 255),
0.6);
SolidColorBrush myBrush = new SolidColorBrush(
//Color.FromArgb(127, 0xDD, 0xDD, 0xF0));
//Color.FromArgb(255, 210, 210, 255));
Color.FromArgb(127, Color.LightBlue));
graphics.SmoothingMode = fillSmoothingMode;
graphics.FillPath(myBrush, path);
graphics.SmoothingMode = strokeSmoothingMode;
graphics.DrawPath(myPen, path);
path.Reset();
//draw clips ...
if (rbNonZero.IsChecked)
{
path.FillMode = FillMode.Winding;
}
foreach (Polygon pg in clips)
{
Point[] pts = PolygonToPointArray(pg, scale);
path.AddPolygon(pts);
pts = null;
}
myPen.Color = Color.FromArgb(128, Color.Red); //0xF9, 0xBE, 0xA6);
myBrush.Color = //Color.FromArgb(127, 0xFF, 0xE0, 0xE0);
Color.FromArgb(50, 255, 0, 0);
graphics.SmoothingMode = fillSmoothingMode;
graphics.FillPath(myBrush, path);
graphics.SmoothingMode = strokeSmoothingMode;
graphics.DrawPath(myPen, path);
//do the clipping ...
if ((clips.Count > 0 || subjects.Count > 0) &&
!rbNone.IsChecked)
{
Polygons solution2 = new Polygons();
Clipper c = new Clipper(0);
c.AddPaths(subjects, PolyType.ptSubject, true);
c.AddPaths(clips, PolyType.ptClip, true);
solution.Clear();
bool succeeded = c.Execute(GetClipType(), solution, GetPolyFillType(), GetPolyFillType());
if (succeeded)
{
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)
{
//old solution2 = Clipper.OffsetPolygons(solution, (double)nudOffset.Value * scale, JoinType.jtMiter);
ClipperOffset co = new ClipperOffset(2, 0.25);
co.AddPaths(solution, JoinType.jtMiter, EndType.etClosedPolygon);
co.Execute(ref solution2, (double)nudOffset.Value * scale);
}
else
{
solution2 = new Polygons(solution);
}
foreach (Polygon pg in solution2)
{
Point[] pts = PolygonToPointArray(pg, scale);
if (pts.Length//Count()
> 2)
{
path.AddPolygon(pts);
}
pts = null;
}
//myBrush.Color = Color.FromArgb(127, 0x66, 0xEF, 0x7F);
myBrush.Color = Color.FromArgb(100, 0, 255, 0);
myPen.Color = Color.FromArgb(255, 0, 0x33, 0);
myPen.Width = 1;
graphics.SmoothingMode = fillSmoothingMode;
graphics.FillPath(myBrush, path);
graphics.SmoothingMode = strokeSmoothingMode;
graphics.DrawPath(myPen, path);
//now do some fancy testing ...
Font f = new Font("Arial", 8);
Brush b = Brushes.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);
}
StringFormat lftStringFormat = new StringFormat();
lftStringFormat.Alignment = StringAlignment.Near;
lftStringFormat.LineAlignment = StringAlignment.Near;
StringFormat rtStringFormat = new StringFormat();
rtStringFormat.Alignment = StringAlignment.Far;
rtStringFormat.LineAlignment = StringAlignment.Near;
RectI rec = new RectI(WorkArea.Width - 114, WorkArea.Height - 116, 104, 106);
graphics.FillRectangle(new SolidColorBrush(Color.FromArgb(196, Color.WhiteSmoke)), rec);
graphics.DrawRectangle(myPen, rec);
rec.Inflate(new SizeI(-2, 0));
// because of Alt.Sketch smaller top offset
rec += new PointI(0, 1);
rec -= new SizeI(0, 1);
graphics.DrawString("Areas", f, b, rec, rtStringFormat);
rec.Offset(new PointI(0, 14));
graphics.DrawString("subj: ", f, b, rec, lftStringFormat);
graphics.DrawString((subj_area / 100000).ToString("0,0"), f, b, rec, rtStringFormat);
rec.Offset(new PointI(0, 12));
graphics.DrawString("clip: ", f, b, rec, lftStringFormat);
graphics.DrawString((clip_area / 100000).ToString("0,0"), f, b, rec, rtStringFormat);
rec.Offset(new PointI(0, 12));
graphics.DrawString("intersect: ", f, b, rec, lftStringFormat);
graphics.DrawString((int_area / 100000).ToString("0,0"), f, b, rec, rtStringFormat);
rec.Offset(new PointI(0, 12));
graphics.DrawString("---------", f, b, rec, rtStringFormat);
rec.Offset(new PointI(0, 10));
graphics.DrawString("s + c - i: ", f, b, rec, lftStringFormat);
graphics.DrawString(((subj_area + clip_area - int_area) / 100000).ToString("0,0"), f, b, rec, rtStringFormat);
rec.Offset(new PointI(0, 10));
graphics.DrawString("---------", f, b, rec, rtStringFormat);
rec.Offset(new PointI(0, 10));
graphics.DrawString("union: ", f, b, rec, lftStringFormat);
graphics.DrawString((union_area / 100000).ToString("0,0"), f, b, rec, rtStringFormat);
rec.Offset(new PointI(0, 10));
graphics.DrawString("---------", f, b, rec, rtStringFormat);
} //end if succeeded
} //end if something to clip
//TEMP pictureBox1.Image = mybitmap;
graphics.Dispose();
GUI.Cursor.Current = GUI.Cursors.Default;
}