// This is the function that tries to make a step, it can recurse once.
public void attemptStep(myVector v, bool recurse)
{
// Optimistic no collision
double t = 1.0;
myVector newV = null;
// Check for team derp collisions
double derpT;
myVector derpV = null;
int colID = manager.CheckDerpCollision(this, v, out derpT, enemyDetected); // note: this returns -1 if either there is no collision, or if we are colliding with the other team
isColliding = (colID != -1);
// We have collided with another derp
// Tell the other to move out of the way, and have us try to move perpendicular to them
if (isColliding && !recurse)
{
Derp slowDerp = manager.SetToMoveOutOfWay(colID, this);
if (slowDerp != null)
{
// Get the Unit Vector towards the slow Derp
myVector u = new myVector(slowDerp.x - x, slowDerp.y - y);
u.toUnit();
// Make sure that the slow derp is actually in front of where you want to go
if (u.dot(v) > 0.0)
{
// Get a perpendicular unit vector to follow
myVector uPerp = new myVector(-u.y, u.x);
// Make sure it is the correct way
double dir = uPerp.dot(v);
// Wrong way
if (dir < -1e-3)
{
uPerp.x *= -1;
uPerp.y *= -1;
}
// Special Zero case, pick a random direction
// this should... almost never happen
// I'm concerned this could mess up random synch in multiplayer. Just pick a constant direction.
else if (dir < 1e-3)
{
/*
* if (MyRandom.Next(team, 2) % 2 == 0)
* {
* uPerp.x *= -1;
* uPerp.y *= -1;
* }
*/
}
// Try moving along the new path
double remainingT = (1.0 - derpT);
derpV = new myVector(uPerp.x * remainingT * v.mag(), uPerp.y * remainingT * v.mag());
}
}
}
// Check for field collisions
double fieldT;
myVector fieldV = null;
myLineSegment collisionVect;
if (Field.field.CheckFieldCollision(this, v, out fieldT, out collisionVect) && !recurse)
{
// try to move parallel to the wall with the extra t
collisionVect.v.toUnit();
// make sure this unit vector is in the right direction
double dir = collisionVect.v.dot(v);
// Wrong way
if (dir < -1e-3)
{
collisionVect.v.x *= -1;
collisionVect.v.y *= -1;
}
// ignore zero case
if (Math.Abs(dir) > 1e-3)
{
// Try moving along the new path
double remainingT = (1.0 - fieldT);
fieldV = new myVector(collisionVect.v.x * remainingT * v.mag(), collisionVect.v.y * remainingT * v.mag());
}
}
// See if we have a collision
// If either of the recalculated V values are not null, we hit something along the way
if (derpT < 1.0 - 1e-6 || fieldT < 1.0 - 1e-6)
{
if (fieldT < derpT)
{
t = fieldT;
newV = fieldV;
}
else
{
t = derpT;
newV = derpV;
}
}
// Only step as far as we can
x += v.x * t;
y += v.y * t;
if (newV != null)
{
attemptStep(newV, true);
}
}
public void Update()
{
// CHECK FOR ATTACKS
// use the derp radar to search for visible enemies in range
Derp enemy = manager.SearchForEnemy(this, 100.0);
enemyDetected = (enemy != null);
// see if we can attack this enemy
myVector toEnemy = null;
if (enemyDetected)
{
toEnemy = new myVector(enemy.x - x, enemy.y - y);
isAttacking = (toEnemy.mag() < stats.radius + enemy.stats.radius + stats.rng);
debugDist = toEnemy.mag();
if (isAttacking && (DateTime.Now.Subtract(lastAttack).TotalMilliseconds > (2000 - 15 * stats.aspd)))
{
lastAttack = DateTime.Now;
enemy.takeHit(stats.atk);
manager.AddAttack(this, enemy);
}
}
else
{
isAttacking = false;
}
// FOLLOW THE TRAIL
// Find the vector between the derp and its current node destination
double dx = path[pathID].x - x;
double dy = path[pathID].y - y;
double mag = Math.Sqrt(dx * dx + dy * dy);
double t = 1.0;
myLineSegment throwaway;
int nextPathID = pathID + (team == TEAM.HOME ? 1 : -1);
// Check if we can move to the next path node
if (mag < (stats.spd * SPEED_CONST))
{
pathID = nextPathID;
// Recalculate for the next node
dx = path[pathID].x - x;
dy = path[pathID].y - y;
mag = Math.Sqrt(dx * dx + dy * dy);
}
// Sometimes we can abort the current node for the next-next node
else if (nextPathID >= 0 && nextPathID < path.Count)
{
// if the next node is behind us (meaning we passed it accidentily) then just keep going
// we use a manual dot product for this
double ndx = path[nextPathID].x - x;
double ndy = path[nextPathID].y - y;
if (dx * ndx + dy * ndy < 0.0 && !Field.field.CheckFieldCollision(this, new myVector(path[nextPathID].x - x, path[nextPathID].y - y), out t, out throwaway))
{
pathID = nextPathID;
// Recalculate for the next node
dx = path[pathID].x - x;
dy = path[pathID].y - y;
mag = Math.Sqrt(dx * dx + dy * dy);
}
// we can give a more liberal option to move forward to the next node
// if we are colliding or seeking an enemy derp, and we can see the next node
else if (isColliding && mag < GENERIOUS_THRESHHOLD &&
!Field.field.CheckFieldCollision(this, new myVector(path[nextPathID].x - x, path[nextPathID].y - y), out t, out throwaway))
{
pathID = nextPathID;
// Recalculate for the next node
dx = path[pathID].x - x;
dy = path[pathID].y - y;
mag = Math.Sqrt(dx * dx + dy * dy);
}
}
// DETERMINE MOVE
if (!isAttacking)
{
// Calculate velocity and try to make the step
double velocity = stats.spd * SPEED_CONST;
myVector v;
if (enemyDetected && toEnemy != null)
{
toEnemy.toUnit();
v = new myVector(toEnemy.x * velocity, toEnemy.y * velocity);
}
else if (moveOutOfWay)
{
// Move out of the way!
v = new myVector(moveOutOfWayVector.x * velocity, moveOutOfWayVector.y * velocity);
}
else
{
// Move Towards next Node
v = new myVector((dx / mag) * velocity, (dy / mag) * velocity);
}
// DEBUG: error catching
double oldx = x;
double oldy = y;
if (isStuck)
{
isStuck = false;
}
// Try to Step
attemptStep(v, false);
// DEBUG: error catching
if (Math.Abs(x - oldx) < 1e-3)
{
isStuck = true;
}
// Update our current instantaneous velocity
vel.x = x - oldx; vel.y = y - oldy;
// WE SHOULD NEVER MOVE THIS FAST. FIND MATH ERRORS.
if (Math.Abs(vel.x) > 50 || Math.Abs(vel.y) > 50)
{
x = oldx;
y = oldy;
}
}
// Reset our MoveOUtOfWay variable, it will be set again next round if we need to keep moving out of the way
moveOutOfWay = false;
// This will be the game end condition eventually
if ((team == TEAM.HOME && x > (Field.field.Width - 1) * Field.BLOCK_WIDTH) || (team == TEAM.AWAY && x < Field.BLOCK_WIDTH) || stats.hp <= 0)
{
Kill();
}
}