/// <summary>
/// Grabs the point mass.
/// </summary>
public void GrabPointMass()
{
//i am now pulling the body.
pulling = true;
//clear old values from last pull
adjacentPointMasses.Clear();
oldMultipliers.Clear();
//set the position to lock it in place while pulling the body
position = body.Position;
//get the closest point mass to the mouse positions and cache some information about it.
mousePosInWorld = Camera.main.ScreenToWorldPoint(Input.mousePosition);
pmIndex = body.getClosestPointMass(mousePosInWorld, false); //only grab edge point masses
pointmass = body.getEdgePointMass(pmIndex);
oldMultipliers.Add (pointmass.shapeMatchingMultiplier);
pointmass.shapeMatchingMultiplier = 0f;
adjacentPointMasses.Add (pointmass);
//Set the body to kinematic to keep it in place while pulling.
body.IsKinematic = true;
int adjIndex = 0;
int numFromStart = 0;
//grab adjacent point masses further in the array.
for(int i = pmIndex; i < pmIndex + numAdjacentPoints; i++)
{
adjIndex = i > body.EdgePointMassCount - 1 ? i - body.EdgePointMassCount : i;
if(adjIndex > body.EdgePointMassCount - 1 || adjacentPointMasses.Contains(body.getEdgePointMass(adjIndex)))
continue;
//cache the point mass info and modify the shape matching values by how close it is to the grabbed point mass
adjacentPointMasses.Add (body.getEdgePointMass(adjIndex));
oldMultipliers.Add(body.getEdgePointMass(adjIndex).shapeMatchingMultiplier);
numFromStart++;
body.getEdgePointMass(adjIndex).shapeMatchingMultiplier = numFromStart / (numAdjacentPoints + 1 + adjacentDropoff);
}
numFromStart = 0;
//grab adjacent point masses before the current index in the array.
for(int i = pmIndex; i > pmIndex - numAdjacentPoints; i--)
{
adjIndex = i < 0 ? i + body.EdgePointMassCount: i;
if(adjIndex < 0 || adjacentPointMasses.Contains(body.getEdgePointMass(adjIndex)))
continue;
//cache the point mass info and modify the shape matching values by how close it is to the grabbed point mass
adjacentPointMasses.Add (body.getEdgePointMass(adjIndex));
oldMultipliers.Add(body.getEdgePointMass(adjIndex).shapeMatchingMultiplier);
numFromStart++;
body.getEdgePointMass(adjIndex).shapeMatchingMultiplier = numFromStart / (numAdjacentPoints + 1 + adjacentDropoff);
}
//find any internal point masses connected to the selected point mass (via spring) and cache/modify its shape matching multiplier.
for(int i = 0; i < body.SpringCount; i++)
{
if(body.getSpring(i).pointMassA == pmIndex || body.getSpring(i).pointMassB == pmIndex)
{
if(body.getSpring(i).pointMassA >= body.EdgePointMassCount)
{
adjacentPointMasses.Add (body.getPointMass(body.getSpring(i).pointMassA));
oldMultipliers.Add (body.getPointMass(body.getSpring(i).pointMassA).shapeMatchingMultiplier);
body.getPointMass(body.getSpring(i).pointMassA).shapeMatchingMultiplier = 1 / (2 + adjacentDropoff);
}
else if(body.getSpring(i).pointMassB >= body.EdgePointMassCount)
{
adjacentPointMasses.Add (body.getPointMass(body.getSpring(i).pointMassB));
oldMultipliers.Add (body.getPointMass(body.getSpring(i).pointMassB).shapeMatchingMultiplier);
body.getPointMass(body.getSpring(i).pointMassB).shapeMatchingMultiplier = 1 / (2 + adjacentDropoff);
}
}
}
}