private bool CheckStatic(BaseGrain grain)
{
bool leftCovered = false;
bool rightCovered = false;
bool bottomCovered = false;
bool topCovered = false;
if (grain.simX == 0 || grainHandler.GrainAt(grain.simX - 1, grain.simY))
{
leftCovered = true;
}
if (grain.simX == grainHandler.maxGrainWidth || grainHandler.GrainAt(grain.simX + 1, grain.simY))
{
rightCovered = true;
}
if (grain.simY == 0 || grainHandler.GrainAt(grain.simX, grain.simY - 1))
{
bottomCovered = true;
}
if (grainHandler.GrainAt(grain.simX, grain.simY + 1))
{
topCovered = true;
}
return(leftCovered && rightCovered && bottomCovered && topCovered);
}
private void UpdateGrain(BaseGrain grain)
{
if (grain.IsStatic)
{
return;
}
// Stop falling if on floor
if (grain.simY == 0)
{
//grain.IsStatic = CheckStatic(grain);
}
// If there is a grain below, try to fall to the side
else if (grainHandler.GrainAt(grain.simX, grain.simY - 1))
{
//grain.IsStatic = CheckStatic(grain);
//if (grain.IsStatic) return;
TryFlowDown(grain);
}
// If not on the floor and there is no grain below, fall directly down
else
{
grainHandler.MoveGrain(grain, 0, -1);
}
}
// Create grain on canvas click
public void CanvasClick(Point mousePos)
{
BaseGrain newGrain = grainHandler.TryCreateGrain(
mousePos.X,
simCanvas.ActualHeight - mousePos.Y);
if (newGrain != null)
{
allGrains.Add(newGrain);
}
}
private void TryFlowDown(BaseGrain grain)
{
bool canFallLeft = false;
bool canFallRight = false;
// If the grain is not on the left wall and there is no grain to the left, try to fall left
if (grain.simX > 0 && !grainHandler.GrainAt(grain.simX - 1, grain.simY))
{
Vector leftGrain = GetTopMostGrain(grain.simX - 1);
double slopeL = (leftGrain.Y - grain.simY) / (leftGrain.X - grain.simX);
if (slopeL > grain.maxSlope)
{
canFallLeft = true;
}
}
// If the grain is not on the right wall and there is no grain to the right, try to fall right
if (grain.simX < grainHandler.maxGrainWidth && !grainHandler.GrainAt(grain.simX + 1, grain.simY))
{
Vector rightGrain = GetTopMostGrain(grain.simX + 1);
double slopeR = (grain.simY - rightGrain.Y) / (grain.simX - rightGrain.X);
if (slopeR < -1 * grain.maxSlope)
{
canFallRight = true;
}
}
int xMovement;
// If the grain can move either left OR right, pick at random depending if on the frame number is even or odd
if (canFallRight && canFallLeft)
{
xMovement = (randomGen.Next() % 2 == 0) ? -1 : 1;
if (xMovement < 0)
{
Debug.WriteLine("chose left");
}
else
{
Debug.WriteLine("chose right");
}
}
// If the grain can't move at all, don't
else if (!canFallRight && !canFallLeft)
{
return;
}
// Move left if canFallLeft, else move right
else
{
xMovement = (canFallLeft) ? -1 : 1;
}
int yMovement = 0;
if (grain.maxSlope >= 1)
{
yMovement = -1;
}
grainHandler.MoveGrain(grain, xMovement, yMovement);
}
