// -----------------------
// --- Package Methods ---
// -----------------------
public void Print()
{
for (int i = 0; i < m_List.Count; i++)
{
IPoly p = GetInnerPoly(i);
Console.WriteLine("InnerPoly(" + i + ").hole=" + p.IsHole());
for (int j = 0; j < p.PointCount; j++)
{
Console.WriteLine(p.GetX(j) + " " + p.GetY(j));
}
}
}
/// <summary>
/// Recursively process the polygon to attempt to find a
/// single polygon element that could be added to the physics
/// layer without any holes or additional physics.
/// </summary>
private void CreateJunctionPhysics(
int depth, IPoly poly, RectangleF bounds)
{
// Ignore empty polygons
if (poly.InnerPolygonCount == 0)
return;
// See if we are a solid polygon
double areaDifference = bounds.Width * bounds.Height - poly.Area;
if (poly.InnerPolygonCount == 1)
{
if (poly.IsHole())
// Don't add holes
return;
if (poly.PointCount == 4 && areaDifference <= 0.1f)
// We appear to be at least mostly solid, drop it
return;
}
// If we have more than one polygon, split it
if (poly.InnerPolygonCount > 1 ||
bounds.Width > Constants.MaximumJunctionPhysicsBlock ||
bounds.Height > Constants.MaximumJunctionPhysicsBlock)
{
// We split the polygon into quads and process each
// one to add it recursively.
CreateJunctionPhysics(depth + 1, poly, bounds, 0, 0);
CreateJunctionPhysics(depth + 1, poly, bounds, 0, 1);
CreateJunctionPhysics(depth + 1, poly, bounds, 1, 1);
CreateJunctionPhysics(depth + 1, poly, bounds, 1, 0);
return;
}
// We should never get a hole
if (poly.IsHole())
{
// We shouldn't get this
Log.Error("Got a top-level polygon hole");
return;
}
// Create a polygon shape as vectors
LinkedList<Vector2D> vectors = new LinkedList<Vector2D>();
for (int i = 0; i < poly.PointCount; i++)
{
// Get the coordinates
float x = (float) poly.GetX(i);
float y = (float) poly.GetY(i);
// Create the vector
vectors.Add(new Vector2D(x, y));
}
// Convert it into a physics2d polygon shape. Making the
// PolygonShape second parameter too small makes the game
// basically unusable in terms of stage generation but
// more accurate for impacts with the side.
Vector2D [] array = vectors.ToArray();
IShape ps = new PolygonShape(array, 5f);
physicsShapes.Add(ps);
}
/// <summary>
/// Renders an arbitrary polygon to the context.
/// </summary>
private void RenderPolygon(
Context g, IPoly poly, PointF point, Color color)
{
// Save the first point
PointF firstPoint = PointF.Empty;
// Go through the points of the polygon
for (int i = 0; i < poly.PointCount; i++)
{
// Pull out the coordinates
float x = (float) poly.GetX(i);
float y = (float) poly.GetY(i);
PointF p = new PointF(cx + point.X + x, cy + point.Y + y);
// Either move or line
if (firstPoint == PointF.Empty)
{
firstPoint = p;
g.MoveTo(p.X, p.Y);
}
else
{
g.LineTo(p.X, p.Y);
}
}
// Finish up
g.LineTo(firstPoint.X, firstPoint.Y);
g.Color = color;
g.Fill();
}