public static bool goingToBeAtOrPastPoint(Vector2 currentPosition, Vector2 target, ref Vector2 delta, out Vector2 distanceMinusTarget,
out Vector2 positiveDelta)
{
bool goingToBeAtOrPast = false;
// for this calculation to see if we are at the target, we need to work with positive only numbers
float y = delta.Y;
float x = delta.X;
if (delta.Y < 0)
{
y = -y;
}
if (delta.X < 0)
{
x = -x;
}
positiveDelta = new Vector2(x, y);
Vector2 minVector, maxVector;
PositionUtils.getMinMax(target, currentPosition, out minVector, out maxVector);
distanceMinusTarget = Vector2.Subtract(maxVector, minVector);
if (x >= distanceMinusTarget.X && y >= distanceMinusTarget.Y)
{
goingToBeAtOrPast = true;
}
return(goingToBeAtOrPast);
}
public static void handleChildMovement(float distance, ref Vector2 heading, ref Vector2 position, ref float rotation, ref List <TargetPosition> targetPositions)
{
Vector2 delta = PositionUtils.getDelta(heading, distance);
Vector2 distanceMinusTarget, minVector, maxVector, positiveDelta;
if (targetPositions != null && targetPositions.Count > 0 && goingToBeAtOrPastPoint(position, targetPositions[0].Position, ref delta, out distanceMinusTarget, out positiveDelta))
{
TargetPosition targetPosition = targetPositions[0];
Type type = targetPosition.GetType();
if (type == typeof(WarpCoordinates))
{
PositionUtils.getMinMax(positiveDelta, distanceMinusTarget, out minVector, out maxVector);
Vector2 deltaMinusTargetDistance = Vector2.Subtract(maxVector, minVector);
// we need to apply the remainder to the new direction
position = ((WarpCoordinates)targetPosition).WarpTo;
if (heading == Constants.HEADING_DOWN || heading == Constants.HEADING_UP)
{
delta = PositionUtils.getDelta(heading, deltaMinusTargetDistance.Y);
position = new Vector2(position.X, position.Y + delta.Y);
}
else if (heading == Constants.HEADING_LEFT || heading == Constants.HEADING_RIGHT)
{
delta = PositionUtils.getDelta(heading, deltaMinusTargetDistance.X);
position = new Vector2(position.X + delta.X, position.Y);
}
}
else if (type == typeof(PivotPoint))
{
PivotPoint pivotPoint = ((PivotPoint)targetPosition);
// we are either at or going to pass through the pivot point so we need to set to pivot point + the extra distance
PositionUtils.getMinMax(positiveDelta, distanceMinusTarget, out minVector, out maxVector);
Vector2 deltaMinusPivotDistance = Vector2.Subtract(maxVector, minVector);
// we need to apply the remainder to the new direction
position = pivotPoint.Position;
if (heading == Constants.HEADING_DOWN || heading == Constants.HEADING_UP)
{
delta = PositionUtils.getDelta(pivotPoint.Heading, deltaMinusPivotDistance.Y);
position = new Vector2(position.X + delta.X, position.Y);
}
else if (heading == Constants.HEADING_LEFT || heading == Constants.HEADING_RIGHT)
{
delta = PositionUtils.getDelta(pivotPoint.Heading, deltaMinusPivotDistance.X);
position = new Vector2(position.X, position.Y + delta.Y);
}
rotation += MathHelper.ToRadians(pivotPoint.Rotation);
heading = pivotPoint.Heading;
}
targetPositions.RemoveAt(0);
}
else
{
position += delta;
}
}