Vec4D CSceneData::getColor(float fX, float fY)const
{
int nCellX = fX;
int nCellY = fY;
float u = fX - nCellX;
float v = fY - nCellY;
Vec4D a = getVertexColor(nCellX, nCellY);
Vec4D b = getVertexColor(nCellX+1, nCellY);
Vec4D c = getVertexColor(nCellX, nCellY+1);
Vec4D d = getVertexColor(nCellX+1, nCellY+1);
return bilinearInterpolation(a,b,c,d,u,v);
}
//------------------------------------------------------------------------------
void NiceGraph::layersByGroupLayout(float radius, float nodeSize)
{
float count[5] = {0,0,0,0,0}; // only handles up to five groups
float last[5];
float xStep = radius / (2.0 * nodeSize * getNumVertices());
float yStep = 2 * xStep;
// first count how many are in each group for each one
for (map<int,Vertex*>::iterator iter = vertexList.begin(); iter != vertexList.end(); iter++)
{
int group = getVertexColor(iter->first);
switch (group)
{
case 0:count[0]++;break;
case 1:count[1]++;break;
case 2:count[2]++;break;
case 3:count[3]++;break;
case 4:count[4]++;break;
}
}
// now set starting points
for (int i = 0; i < 5; i++)
{
last[i] = -1.0 * xStep * count[i] / 2.0;
}
// now set the plotting points
for (map<int,Vertex*>::iterator iter = vertexList.begin(); iter != vertexList.end(); iter++)
{
// set position for this vertex
int v = iter->first;
int group = getVertexColor(v);
float x = last[group];
float y = group * yStep;
float z = 0;
setXYZPos (v,x,y,z);
// now update coordinates for next iteration
last[group]+=xStep;
}
}