// Uses a circle based on the closest blob to the cell center as an approximation
// for cell area.
public void UpdateAreaSprings(BlobArrays blobs)
{
foreach (int startIndex in BlobIndices)
{
Vector2d averagePos = new Vector2d();
for (int i = 0; i < BoundaryElementsInCell; i++)
{
averagePos += blobs.Positions[startIndex + i];
}
averagePos /= CellDataArrays.BoundaryElementsInCell;
float area = 0.0f;
for (int i = 1; i < BoundaryElementsInCell; i++)
{
Vector2d A = blobs.Positions[startIndex + i] - blobs.Positions[startIndex + i - 1];
Vector2d B = blobs.Positions[startIndex + i] - averagePos;
Vector2d C = blobs.Positions[startIndex + i - 1] - averagePos;
float a = A.Length();
float b = B.Length();
float c = C.Length();
float s = (a + b + c) / 2.0f;
float traingleAreaSquared = (s - a) * (s - b) * (s - c) * s;
area += (float)Math.Sqrt(traingleAreaSquared);
}
{
// Account for the triangle formed by the first and last blobs;
Vector2d A = blobs.Positions[startIndex] - blobs.Positions[startIndex + BoundaryElementsInCell - 1];
Vector2d B = blobs.Positions[startIndex] - averagePos;
Vector2d C = blobs.Positions[startIndex + BoundaryElementsInCell - 1] - averagePos;
float a = A.Length();
float b = B.Length();
float c = C.Length();
float s = (a + b + c) / 2.0f;
float traingleAreaSquared = (s - a) * (s - b) * (s - c) * s;
area += (float)Math.Sqrt(traingleAreaSquared);
}
float compression = CellTargetArea - area;
compression = Math.Max(compression, 0.0f);
for (int i = 0; i < BoundaryElementsInCell; i++)
{
Vector2d localPos = averagePos - blobs.Positions[startIndex + i];
Vector2d force = localPos / localPos.Length();
force *= AreaSpringStrength * compression;
blobs.Velocities[startIndex + i] -= force;
}
}
}
public World(IRenderer renderer)
{
m_baseColours = new Colour[12];
m_baseColours[00] = new Colour()
{
R = 1.0f, G = 0.0f, B = 0.0f, A = 0.0f
};
m_baseColours[01] = new Colour()
{
R = 0.0f, G = 1.0f, B = 0.0f, A = 0.0f
};
m_baseColours[02] = new Colour()
{
R = 0.0f, G = 0.0f, B = 1.0f, A = 0.0f
};
m_baseColours[03] = new Colour()
{
R = 1.0f, G = 1.0f, B = 0.0f, A = 0.0f
};
m_baseColours[04] = new Colour()
{
R = 0.0f, G = 1.0f, B = 1.0f, A = 0.0f
};
m_baseColours[05] = new Colour()
{
R = 1.0f, G = 0.0f, B = 1.0f, A = 0.0f
};
m_baseColours[06] = new Colour()
{
R = 1.0f, G = 0.5f, B = 0.5f, A = 0.0f
};
m_baseColours[07] = new Colour()
{
R = 0.5f, G = 1.0f, B = 0.5f, A = 0.0f
};
m_baseColours[08] = new Colour()
{
R = 0.5f, G = 0.5f, B = 1.0f, A = 0.0f
};
m_baseColours[09] = new Colour()
{
R = 1.0f, G = 1.0f, B = 0.5f, A = 0.0f
};
m_baseColours[10] = new Colour()
{
R = 0.5f, G = 1.0f, B = 1.0f, A = 0.0f
};
m_baseColours[11] = new Colour()
{
R = 1.0f, G = 0.5f, B = 1.0f, A = 0.0f
};
m_random = new Random();
m_renderer = renderer;
m_scene = m_renderer.GetNewScene();
m_scene.CreateCamera();
m_scene.SetCurrentCamera(0);
m_basisRenderArrays = new RenderArrays();
m_springRenderArrays = new RenderArrays();
m_bBoxRenderArrays = new RenderArrays();
m_renderArrays = new RenderArrays();
m_blobs = new BlobArrays();
m_directionalSprings = new DirectionalSpringArray();
m_collisions = new List <Tuple <int, int> >();
m_cellData = new CellDataArrays();
m_BBoxTree = new BBoxTree();
m_springs = new SpringArray();
m_renderArrays.Positions = m_blobs.Positions;
m_renderArrays.Colours = m_blobs.Colours;
m_bBoxRenderArrays.Colours.Add(m_baseColours[0]);
m_bBoxRenderArrays.Positions.Add(new Vector2d());
//InitVisualisationTest();
for (int i = -0; i < 1; i++)
{
bool grow = i == 0 ? true : false;
InitCell(new Vector2d()
{
X = (float)(250.0f * i + 150.0f), Y = 0
}, i + 4, grow);
}
//InitCell(new Vector2d() { X = -100.0f, Y = 0.0f }, 0, true);
m_scene.RenderArrays.Add(m_renderArrays);
//m_scene.RenderArrays.Add(m_bBoxRenderArrays);
m_scene.RenderArrays.Add(m_springRenderArrays);
m_scene.RenderArrays.Add(m_basisRenderArrays);
m_basisRenderArrays.Positions.Add(new Vector2d());
m_basisRenderArrays.Colours.Add(m_baseColours[5]);
m_basisRenderArrays.Positions.Add(new Vector2d());
m_basisRenderArrays.Colours.Add(m_baseColours[5]);
}
