public void IsConvexTest()
{
var region = PolygonMethods.Rectangle(new KtPoint2D(2, 2), 40, 30, true);
Assert.AreEqual(region.IsConvex, false);
KtRegion region2 = (CreateArbitraryRegion());
Assert.AreEqual(region2.IsConvex, true);
KtRegion reg = (new List <KtPoint2D>
{
new KtPoint2D(0, 0),
new KtPoint2D(0, 10),
new KtPoint2D(5, 10),
new KtPoint2D(0, 20),
new KtPoint2D(10, 20),
new KtPoint2D(10, 0)
});
Assert.AreEqual(reg.IsConvex, true);
KtRegion rec = (new List <KtPoint2D>
{
new KtPoint2D(0, 0),
new KtPoint2D(20, 0),
new KtPoint2D(20, 5),
new KtPoint2D(0, 5)
});
Assert.AreEqual(rec.IsConvex, false);
}
public void AreaTest()
{
var region = PolygonMethods.Rectangle(new KtPoint2D(2, 2), 40, 30, true);
Assert.AreEqual(region.Area(), 40 * 30);
KtRegion rec = (new List <KtPoint2D>
{
new KtPoint2D(0, 0),
new KtPoint2D(20, 0),
new KtPoint2D(20, 5),
new KtPoint2D(0, 5)
});
Assert.AreEqual(rec.Area(), 20 * 5.0);
KtRegion triangle = (new List <KtPoint2D>
{
new KtPoint2D(0, 0),
new KtPoint2D(20, 5),
new KtPoint2D(0, 10)
});
Assert.AreEqual(triangle.Area(), 20 * 10.0 / 2);
KtRegion triangle2 = (new List <KtPoint2D>
{
new KtPoint2D(0, 0),
new KtPoint2D(20, 0),
new KtPoint2D(0, 10)
});
Assert.AreEqual(triangle2.Area(), 20 * 10.0 / 2);
}
public static string AddToPolygonText(this KtRegion region, string polygonName)
{
var builder = new StringBuilder();
builder.Append(polygonName).Append(".Add(");
builder.Append(region.CreateARegionInstance());
builder.Append("); \n");
return(builder.ToString());
}
public void Remove(KtRegion region)
{
var(intersected, notintersected) = _regions.Fork(reg => region.IsIntersecting(reg));
if (!intersected.IsEmpty())
{
_regions = notintersected.ToList();
foreach (var reg in intersected)
{
foreach (var cut in reg.Remove(region))
{
_regions.Add(cut);
}
}
}
}
public void Add(KtRegion region)
{
switch (region)
{
case KtHollowRegion hollow:
Add(hollow);
break;
case KtSolidRegion solid:
Add(solid);
break;
default:
throw new Exception("");
}
}
public static string CreateARegionInstance(this KtRegion region)
{
var builder = new StringBuilder();
builder.Append(region is KtSolidRegion ? "new KtSolidRegion" : "new KtHollowRegion");
if (region == null || region.Count == 0)
{
builder.Append("()");
}
else
{
builder.Append("( new KtPoint2D[]{")
.Append('(').Append(region.First().X).Append(',').Append(region.First().Y).Append(')');
foreach (var corner in region.Skip(1))
{
builder.Append(",(").Append(corner.X).Append(',').Append(corner.Y).Append(')');
}
builder.Append("})");
}
return(builder.ToString());
}
public static void DrawRegion(this Graphics gr, KtRegion reg, Color color)
{
if (reg.Count < 3)
{
return;
}
var regconvert = reg.Corners.Select(corner => new Point((int)corner.X, (int)corner.Y)).ToArray();
using (var pen = new Pen(!reg.IsClockwise ? color : Color.FromArgb(color.ToArgb() ^ 0xffffff)))
{
gr.FillPolygon(pen.Brush, regconvert);
gr.DrawPolygon(Pens.WhiteSmoke, regconvert);
}
if (reg is KtSolidRegion solid)
{
foreach (var hole in solid.Holes)
{
gr.DrawRegion(hole, color);
}
}
}
public void CentroidTest()
{
var region = PolygonMethods.Rectangle(new KtPoint2D(2, 2), 40, 30, true);
Assert.AreEqual(region.Centroid(), new KtPoint2D(2, 2));
KtRegion rec = (new List <KtPoint2D>
{
new KtPoint2D(0, 0),
new KtPoint2D(20, 0),
new KtPoint2D(20, 5),
new KtPoint2D(0, 5)
});
Assert.AreEqual(rec.Centroid(), new KtPoint2D(10, 2.5));
KtRegion triangle = (new List <KtPoint2D>
{
new KtPoint2D(0, 0),
new KtPoint2D(20, 0),
new KtPoint2D(0, 10)
});
Assert.AreEqual(triangle.Centroid(), new KtPoint2D(20.0 / 3, 10.0 / 3));
}
public static Point[] ToArrayOfPoints(this KtRegion region)
{
return(region.Corners.Select(corner => new Point((int)corner.X, (int)corner.Y)).ToArray());
}
internal static (EnumerableSolids solid, EnumerableHollows hollow) Clip(this EnumerableRegions subjects, KtRegion clip, ClipType clipType, bool reversed = false) => Clip(subjects, new[] { clip }, clipType, reversed);
