/// <summary>
/// Vytvoří fyzický model tělesa jako objekt z daných vertexů
/// </summary>
/// <param name="Vertices">Vertexy tělesa</param>
/// <param name="InitPosition">Počáteční poloha tělesa</param>
/// <param name="COG">Těžiště tělesa</param>
public Geometry(PointF[] Vertices,PointF InitPosition, PointF? COG)
{
if (Vertices == null || Vertices.Length < 3) throw new ArgumentException();
surf = vol = angle = 0;
scale = 1.0f;
desc = AnalyzeVertexGroup(Vertices);
geom = new PointF[Vertices.Length];
Vertices.CopyTo(geom, 0);
if (COG.HasValue)
center = (Vector)COG;
else center = (Vector)desc.Centroid;
Nail = (Vector)InitPosition;
Position = (Vector)InitPosition;
}
/// <summary>
/// Analyzuje pole vertexů jako polygon a zjistí jeho geometrický střed (centroid), šířku a výšku
/// </summary>
/// <param name="Vertices">Pole vertexů</param>
/// <returns>Výsledek analýzy polygonu</returns>
public static GeometryDescriptor AnalyzeVertexGroup(PointF[] Vertices)
{
if (Vertices.Length <= 1)
throw new ArgumentException();
GeometryDescriptor Description = new GeometryDescriptor(Vertices);
Description.FrontalArea = PolygonArea(Vertices);
for (int i = 0,j = 0; i < Vertices.Length; i++)
{
j = (i + 1) % Vertices.Length;
Description.Centroid.X += (Vertices[i].X + Vertices[j].X) * (Vertices[i].X * Vertices[j].Y - Vertices[i].Y * Vertices[j].X);
Description.Centroid.Y += (Vertices[i].Y + Vertices[j].Y) * (Vertices[i].X * Vertices[j].Y - Vertices[i].Y * Vertices[j].X);
}
Description.ConvexHull = ConvexHull.GetConvexHull(Vertices);
Description.Centroid.X /= (float)(Description.FrontalArea * 6);
Description.Centroid.Y /= (float)(Description.FrontalArea * 6);
using (System.Drawing.Drawing2D.GraphicsPath p = new System.Drawing.Drawing2D.GraphicsPath())
{
p.AddPolygon(Vertices);
RectangleF r = p.GetBounds();
Description.Width = r.Width;
Description.Height = r.Height;
}
return Description;
}
private void panel1_MouseClick(object sender, MouseEventArgs e)
{
if (COG != null) return;
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
foreach (PointF p in pts)
{
if (p.X == e.X && p.Y == e.Y)
return;
}
pts.Add(new PointF(e.X, e.Y));
}
else if (e.Button == System.Windows.Forms.MouseButtons.Right)
{
COG = e.Location;
try
{
Desc = Geometry.AnalyzeVertexGroup(pts.ToArray());
label_cCOG.Text = String.Format("Centroid: [{0:f1};{1:f1}]", Desc.Centroid.X, Desc.Centroid.Y);
label_COG.Text = String.Format("Určené těžiště: [{0};{1}]", COG.Value.X, COG.Value.Y);
}
catch (ArgumentException)
{
MessageBox.Show("Neplatný počet vertexů!");
}
}
text_objName.Enabled = COG != null;
button_selTexture.Enabled = button_SetCOG.Enabled = button_selColor.Enabled = COG != null;
drawPanel.Invalidate();
}
