FootballControl.mesa
Copyright © 1985 by Xerox Corporation. All rights reserved.
Maxwell, March 15, 1983 10:21 am
Spreitzer, May 1, 1984 10:58:28 pm PDT
Russ Atkinson (RRA) January 23, 1985 9:20:39 pm PST
DIRECTORY
Basics USING [LowHalf],
BasicTime USING [GMT, Now, nullGMT, Pulses, GetClockPulses],
FootballInternal,
FootballMaster,
FootballMasterRpcControl USING [ExportInterface, UnexportInterface],
Process USING [SetTimeout],
RealFns USING [SqRt],
Rope USING [ROPE],
RPC USING [MakeKey],
UserCredentials USING [Get];
FootballControl:
MONITOR
IMPORTS Basics, BasicTime, FootballMaster, FootballMasterRpcControl, Process, RealFns, RPC, UserCredentials
EXPORTS FootballInternal, FootballMaster = {
OPEN FootballMaster;
StupidFuckingWarnings: PUBLIC SIGNAL [itsGottaHaveAGoddamName: ATOM] = CODE;
******************************************************************
RPC procedure
******************************************************************
process: PROCESS ← NIL;
StartServer:
PUBLIC
ENTRY
PROC[name: Rope.
ROPE] = {
user, password: Rope.ROPE;
IF stopped = FALSE THEN RETURN ELSE stopped ← FALSE;
process ← FORK Main[];
[user, password] ← UserCredentials.Get[];
FootballMasterRpcControl.ExportInterface[
interfaceName: [instance: name],
user: user,
password: RPC.MakeKey[password]];
};
StopServer:
PUBLIC
ENTRY
PROC = {
IF stopped = TRUE OR process = NIL THEN RETURN ELSE stopped ← TRUE;
WHILE process # NIL DO WAIT timer; ENDLOOP;
FootballMasterRpcControl.UnexportInterface[];
};
Init:
PROC = {
controlGame ← NEW[GameRec ← []];
FOR i: Position
IN Players
DO
controlGame.player[i].position ← i;
ENDLOOP;
};
******************************************************************
Control procedures
******************************************************************
controlGame: Game;
slow: BOOL ← FALSE;
commands: ARRAY Team OF Commands ← [ALL[[stop, [null[]]]], ALL[[stop, [null[]]]]];
SetCommands:
PUBLIC
PROC[team: Team, c: Commands]
RETURNS[GameRec] = {
commands[team] ← c;
RETURN[controlGame^];
};
OffField:
PROC = {
controlGame.state ← offField;
controlGame.ballCarrier ← none;
controlGame.player[ball].x ← -100;
controlGame.player[ball].y ← -100;
controlGame.ballTarget ← [absolute[-100, -100]];
controlGame.clockStopped ← TRUE;
};
KickOff:
PUBLIC
PROC[team: Team] = {
IF controlGame.quarter = 5
THEN {
controlGame.quarter ← 1;
controlGame.score ← [0, 0]};
IF controlGame.quarter = 1 AND controlGame.clock = 15*60 THEN team ← home;
IF controlGame.quarter = 3 AND controlGame.clock = 15*60 THEN team ← visitors;
controlGame.offense ← controlGame.possessor ← team;
IF Goal[team, controlGame.quarter] < 50
THEN controlGame.scrimmage ← 20
ELSE controlGame.scrimmage ← 80;
FirstDown[];
Huddle[];
};
Huddle:
PROC = {
FOR i: Position
IN Players
DO
controlGame.player[i].dx ← 0;
controlGame.player[i].dy ← 0;
ENDLOOP;
controlGame.player[ball].x ← controlGame.scrimmage;
controlGame.player[ball].y ← fieldWidth/2;
controlGame.ballCarrier ← none;
controlGame.ballTarget ← [absolute[controlGame.scrimmage, fieldWidth/2]];
controlGame.state ← huddle;
controlGame.pass ← FALSE;
controlGame.lateral ← FALSE;
delay ← 1;
startHuddle ← controlGame.clock;
};
SetUp:
PUBLIC
PROC[team: Team] = {
IF controlGame.state = offField THEN KickOff[team];
controlGame.state ← setUp;
};
Hike:
PUBLIC
PROC[team: Team] = {
hike: REAL;
count: NAT ← 0;
IF team # controlGame.offense THEN RETURN;
IF ~Ready[home] OR ~Ready[visitors] THEN RETURN;
delay ← IF slow THEN 5 ELSE 1;
controlGame.penalties ← [none, none];
controlGame.penaltyState ← none;
controlGame.clockStopped ← FALSE;
hike ← controlGame.scrimmage - Direction[controlGame.offense, controlGame.quarter]*15;
move the ball back so that the center won't catch it
controlGame.player[ball].x ← controlGame.scrimmage - Direction[controlGame.offense, controlGame.quarter]*1.1;
controlGame.ballTarget ← [absolute[hike, fieldWidth/2]];
controlGame.ballCarrier ← ball;
check for offSides and illegal formations
FOR i: Position
IN Players
DO
player: Player = @controlGame.player[i];
team: Team = TeamOf[i];
player.blocking ← none; -- reset
SELECT
TRUE
FROM
team # controlGame.offense => {
no check for defense in motion
};
player.dx > -0.5
AND player.dx < 0.5
AND player.dy > -0.5
AND player.dy < 0.5 => {
Not really in motion
};
count = 0 => count ← 1;
ENDCASE => controlGame.penalties[controlGame.offense] ← formation;
IF CrossLine[player.x, controlGame.scrimmage, team, controlGame.quarter]
THEN controlGame.penalties[team] ← offSides;
ENDLOOP;
controlGame.state ← option;
};
Ready:
PROC[team: Team]
RETURNS[
BOOL] = {
count: NAT ← 0;
FOR i: Position
IN Players
DO
IF TeamOf[i] # team THEN LOOP;
IF ABS[controlGame.player[i].x - controlGame.scrimmage] < 2 THEN count ← count + 1;
ENDLOOP;
RETURN[count > 2];
};
FirstDown:
PROC = {
controlGame.down ← 1;
IF Goal[controlGame.offense, controlGame.quarter] < 50
THEN controlGame.firstDownMarker ← MIN[100, controlGame.scrimmage + 10]
ELSE controlGame.firstDownMarker ← MAX[0, controlGame.scrimmage - 10];
};
TimeOut:
PUBLIC
PROC[team: Team] = {
IF controlGame.timeouts[team] = 0 THEN RETURN;
IF controlGame.state > option THEN RETURN;
IF controlGame.clockStopped THEN RETURN;
controlGame.clockStopped ← TRUE;
controlGame.timeouts[team] ← controlGame.timeouts[team] - 1;
};
PenaltyResponse:
PUBLIC
PROC[team: Team, accepted:
BOOL] = {
IF controlGame.penalties[Opponent[team]] = none THEN RETURN;
IF controlGame.penaltyState # asking THEN RETURN;
controlGame.penaltyState ← IF accepted THEN accepted ELSE declined;
};
DisableDelayOfGame:
PUBLIC
PROC = {delayOfGame ←
FALSE};
******************************************************************
Main Loop
******************************************************************
timer: CONDITION;
delay: CARDINAL ← 1;
stopped: BOOL ← TRUE;
gmt: BasicTime.GMT ← BasicTime.nullGMT;
startHuddle: INTEGER ← 0;
delayOfGame: BOOL ← TRUE;
Wait:
ENTRY
PROC[i:
CARDINAL] ={
DO IF i = 0 THEN EXIT ELSE i ← i - 1; WAIT timer; ENDLOOP;
};
Main:
PROC = {
x, y: REAL;
player: Player;
command: Commands;
Process.SetTimeout[@timer, 1];
SetOffField[];
DO
Wait[delay];
IF stopped THEN {process ← NIL; EXIT};
check clock and penalties
IF ~controlGame.clockStopped
AND controlGame.quarter # 5
THEN
IF BasicTime.Now[] # gmt
THEN {
controlGame.clock ← controlGame.clock - 1;
gmt ← BasicTime.Now[]};
IF controlGame.clock <= 0
AND controlGame.state < option
THEN
PlayOver[controlGame.scrimmage];
IF delayOfGame
AND controlGame.state < option
AND startHuddle - controlGame.clock > 60
THEN {
readyHome: BOOL = Ready[home];
readyVisitors: BOOL = Ready[visitors];
SELECT
TRUE
FROM
~readyHome AND ~readyVisitors => {startHuddle ← controlGame.clock; LOOP};
~readyHome => controlGame.penalties[home] ← delayOfGame;
~readyVisitors => controlGame.penalties[visitors] ← delayOfGame;
ENDCASE => controlGame.penalties[controlGame.offense] ← delayOfGame;
PlayOver[controlGame.scrimmage, TRUE]};
IF (controlGame.penalties[home] = offSides
OR controlGame.penalties[visitors] = offSides)
AND controlGame.state > setUp THEN PlayOver[controlGame.scrimmage, TRUE];
is the ball now out of play?
x ← controlGame.player[ball].x;
y ← controlGame.player[ball].y;
IF controlGame.state > setUp
AND
(x NOT IN [-10..110] OR y NOT IN [0..fieldWidth]) THEN PlayOver[x, TRUE];
IF controlGame.state > setUp
AND controlGame.ballCarrier # ball
AND
Direction[TeamOf[controlGame.ballCarrier], controlGame.quarter] = 1 AND x > 100
THEN PlayOver[101, TRUE];
IF controlGame.state > setUp
AND controlGame.ballCarrier # ball
AND
Direction[TeamOf[controlGame.ballCarrier], controlGame.quarter] = -1 AND x < 0
THEN PlayOver[-1, TRUE];
move the ball
IF controlGame.state > setUp
AND controlGame.ballCarrier = none
THEN {
[x, y] ← GetTarget[controlGame.ballTarget, none];
MoveBall[@controlGame.player[ball], x, y]; CatchBall[];
IF controlGame.player[ball].x = x
AND controlGame.player[ball].y = y
THEN
-- ball has hit the ground
IF controlGame.pass
AND ~controlGame.lateral
THEN PlayOver[controlGame.scrimmage, TRUE]
ELSE controlGame.state ← liveBall};
are we committed to a run?
IF controlGame.state = option
AND
CrossLine[x, controlGame.scrimmage, controlGame.offense, controlGame.quarter]
THEN controlGame.state ← run;
move home team
command ← commands[home];
FOR i:
CARDINAL
IN [0..6)
DO
player ← @controlGame.player[Add[HQB, i]];
IF controlGame.state
IN [offField..setUp]
THEN {
IF command[i].action # run THEN LOOP;
[x, y] ← GetTarget[command[i].target, player.position];
Move[player, x, y, TRUE]; LOOP};
PlayAction[player, command[i]];
ENDLOOP;
move visitors team
command ← commands[visitors];
FOR i:
CARDINAL
IN [0..6)
DO
player ← @controlGame.player[Add[VQB, i]];
IF controlGame.state
IN [offField..setUp]
THEN {
IF command[i].action # run THEN LOOP;
[x, y] ← GetTarget[command[i].target, player.position];
Move[player, x, y, TRUE]; LOOP};
PlayAction[player, command[i]];
ENDLOOP;
ENDLOOP;
};
ballRange: REAL ← 100;
tackle: REAL ← .7;
block: REAL ← 2.5;
zone: REAL ← 10;
PlayAction:
PROC[player: Player, command: Command] = {
x, y: REAL;
nearest: Position ← none;
i: Position ← player.position;
possessor: BOOL ← (TeamOf[i] = controlGame.possessor);
target: Target ← command.target;
action: Action ← command.action;
IF action # block THEN player.blocking ← none;
check for passing or kicking
IF action = pass
OR action = kick
THEN {
IF controlGame.ballCarrier # i THEN RETURN;
IF action = kick THEN target ← [goal[]];
[x, y] ← GetTarget[target, i];
Pass[player, x, y, action = pass];
RETURN};
try to tackle the ball carrier
IF controlGame.possessor # TeamOf[i]
AND controlGame.ballCarrier # none
AND Catch[player, controlGame.ballCarrier, IF Blocked[player] THEN .4 ELSE .7] THEN {
PlayOver[controlGame.player[controlGame.ballCarrier].x];
RETURN};
IF action = stop THEN RETURN;
look for someone to guard or block
IF action = block
THEN
WITH t: target
SELECT
FROM
player =>
IF possessor
THEN {
IF t.position = none THEN t.position ← Nearest[player, player.x, player.y, block];
IF t.position = none THEN RETURN;
IF Catch[player, t.position, 2] THEN player.blocking ← t.position};
relative, absolute, goal => {
nearest: Position ← none;
[x, y] ← GetTarget[target, i];
IF possessor
THEN
IF
ABS[player.x - x] < block
AND
ABS[player.y - y] < block
THEN nearest ← Nearest[player, x, y, block]
ELSE nearest ← Nearest[player, player.x, player.y, 1];
IF ~possessor THEN nearest ← Nearest[player, x, y, zone];
target ← IF nearest = none THEN [absolute[x, y]] ELSE [player[nearest]];
IF possessor
AND nearest # none
AND
Catch[player, nearest, 2] THEN player.blocking ← nearest};
ENDCASE;
move the player
[x, y] ← GetTarget[target, i];
WITH t: target
SELECT
FROM
player =>
IF t.position = ball
THEN Move[player, x, y, controlGame.ballCarrier = none]
ELSE
IF ~possessor
AND t.position # controlGame.ballCarrier
THEN Move[player, x, y, FALSE, t.position]
ELSE Move[player, x, y];
goal => Move[player, x, y];
relative, absolute => Move[player, x, y, TRUE];
ENDCASE;
};
******************************************************************
utility procedures
******************************************************************
inertia: REAL ← 4;
Move:
PROC[player: Player, x, y:
REAL, stopping:
BOOL ←
FALSE, receiver: Position ← none] = {
ax: REAL ← x - player.x;
ay: REAL ← y - player.y;
speed: REAL ← IF TeamOf[player.position] # controlGame.possessor THEN .22 ELSE .2;
speedProd: REAL ← inertia*speed;
rt: REAL ← RealFns.SqRt[ax*ax + ay*ay];
accelerate towards the target
stopping ← stopping AND rt < .5;
IF stopping THEN {player.dx ← 0; player.dy ← 0};
IF rt # 0
THEN
IF stopping
AND rt < speed
THEN {player.dx ← player.dx + ax; player.dy ← player.dy + ay}
ELSE {player.dx ← player.dx + speed*ax/rt; player.dy ← player.dy + speed*ay/rt};
IF receiver # none
AND rt < 2
THEN {
decelerate
player.dx ← player.dx/2;
player.dy ← player.dy/2;
};
there is an upper bound on the velocity
rt ← RealFns.SqRt[player.dx*player.dx + player.dy*player.dy];
IF rt > speedProd
THEN {
temp: REAL = speedProd/rt;
player.dx ← player.dx*temp;
player.dy ← player.dy*temp;
};
ax ← player.x + player.dx/inertia;
ay ← player.y + player.dy/inertia;
IF controlGame.state < option OR ax IN [-11..111] THEN player.x ← ax;
IF controlGame.state < option OR ay IN [-1..fieldWidth+1] THEN player.y ← ay;
IF player.position = controlGame.ballCarrier
THEN {
controlGame.player[ball].x ← player.x;
controlGame.player[ball].y ← player.y;
controlGame.player[ball].dx ← player.dx;
controlGame.player[ball].dy ← player.dy};
IF controlGame.state >= option
THEN
take blocking into account
FOR i: Position
IN Players
DO
IF i = player.position THEN LOOP;
IF i = controlGame.ballCarrier THEN LOOP;
Block[player, @controlGame.player[i]]
ENDLOOP;
};
GetTarget:
PROC[target: Target, pos: Position]
RETURNS[tx, ty:
REAL] = {
otherTeam: Team = IF TeamOf[pos] = home THEN visitors ELSE home;
goal: INTEGER = Goal[otherTeam, controlGame.quarter, TRUE];
WITH t: target
SELECT
FROM
goal => RETURN[goal, controlGame.player[pos].y];
player =>
IF t.position = ball
AND controlGame.ballCarrier = none
AND controlGame.state = pass
THEN
WITH bt: controlGame.ballCatchable
SELECT
FROM
absolute => RETURN[bt.x, bt.y]; ENDCASE => ERROR
ELSE {
m: REAL;
p1, p2: Player ← NIL;
p1 ← @controlGame.player[pos];
p2 ← @controlGame.player[t.position];
IF p2.blocking = pos THEN RETURN[p2.x, p2.y];
IF ABS[p2.dx] < .1 AND ABS[p2.dy] < .1 THEN RETURN[p2.x, p2.y];
m ← 2*(p2.dx*(p1.x - p2.x) + p2.dy*(p1.y - p2.y));
IF m <= 0 THEN RETURN[p2.x, p2.y];
m ← ((p1.x - p2.x)*(p1.x - p2.x) + (p1.y - p2.y)*(p1.y - p2.y))/m;
RETURN[p2.x + m*p2.dx, p2.y + m*p2.dy]};
relative =>
RETURN[controlGame.scrimmage + (
IF goal > 50
THEN t.x
ELSE -t.x),
fieldWidth/2 + t.y];
absolute => RETURN[t.x, t.y];
ENDCASE => ERROR;
};
Block:
PROC[player1, player2: Player] = {
delta: INTEGER ← 1;
IF player1.blocking = player2.position THEN delta ← 2;
IF player2.blocking = player1.position THEN delta ← 2;
IF ABS[player1.x - player2.x] > delta THEN RETURN;
IF ABS[player1.y - player2.y] > delta THEN RETURN;
player1.dx ← player2.dx ← (player1.dx + player2.dx)/2;
player1.dy ← player2.dy ← (player1.dy + player2.dy)/2;
};
Blocked:
PROC[player: Player]
RETURNS[
BOOL] = {
FOR i: Position
IN Players
DO
IF TeamOf[i] = TeamOf[player.position] THEN LOOP;
IF controlGame.player[i].blocking = player.position THEN RETURN[TRUE];
ENDLOOP;
RETURN[FALSE];
};
Nearest:
PROC[player: Player, x, y:
REAL, delta:
REAL]
RETURNS[nearest: Position ← none] = {
blocked: Position ← none;
bx, by: REAL ← 100;
nx, ny: REAL ← 100;
CheckNear:
PROC[other: Player] = {
dx, dy: REAL;
IF ABS[other.x - x] > delta THEN RETURN;
IF ABS[other.y - y] > delta THEN RETURN;
IF TeamOf[other.position] = controlGame.offense
AND
~CrossLine[other.x, controlGame.scrimmage, controlGame.offense, controlGame.quarter] THEN RETURN;
dx ← ABS[other.x - player.x];
dy ← ABS[other.y - player.y];
IF Blocked[other]
THEN {IF dx < bx AND dy < by THEN {bx ← dx; by ← dy; blocked ← other.position}}
ELSE {IF dx < nx AND dy < ny THEN {nx ← dx; ny ← dy; nearest ← other.position}}};
IF player.position
IN HomeTeam
THEN FOR i: Position IN VisitorsTeam DO CheckNear[@controlGame.player[i]]; ENDLOOP
ELSE FOR i: Position IN HomeTeam DO CheckNear[@controlGame.player[i]]; ENDLOOP;
IF nearest = none THEN nearest ← blocked;
};
Add:
PROC[p: Position, i:
CARDINAL]
RETURNS[Position] =
INLINE {RETURN[LOOPHOLE[LOOPHOLE[p, CARDINAL]+i]]};
******************************************************************
dealing with the ball
******************************************************************
Pass:
PROC[player: Player, x, y:
REAL, pass:
BOOL] = {
team: Team;
delta, x1, y1: REAL;
check for penalties
team ← TeamOf[player.position];
grounded ← IF pass THEN PossibleGround[player, team] ELSE FALSE;
IF grounded THEN passerX ← player.x;
controlGame.lateral ← FALSE;
IF pass
AND controlGame.state = run
THEN
run => ballCarrier crossed line of scrimmage
IF CrossLine[x, player.x, team, controlGame.quarter]
THEN controlGame.penalties[team] ← forwardPass -- illegal forward pass
ELSE controlGame.lateral ← TRUE;
throw the ball
x1 ← x - player.x;
y1 ← y - player.y;
delta ← RealFns.SqRt[x1*x1 + y1*y1];
IF delta > 50
THEN {
d50: REAL = 50/delta;
x ← player.x + x1*d50;
y ← player.y + y1*d50;
delta ← 50;
};
IF delta > .01
THEN {
the ball's target is half of the range after [x,y] (but allow a little error)
temp: REAL = controlGame.ballRange/(2*delta);
rem: REAL ← delta;
add in random errors based on the range (more range, more error)
WHILE rem > 10
DO
nx,ny: REAL;
[nx,ny] ← RandomDelta[ballRandom];
x ← x + nx;
y ← y + ny;
rem ← rem - 10;
ENDLOOP;
controlGame.ballRange ← ballRange/delta;
x1 ← x + temp*(x - player.x);
y1 ← y + temp*(y - player.y);
controlGame.ballTarget ← [absolute[x1, y1]];
IF controlGame.ballRange < delta
THEN controlGame.ballCatchable ← [absolute[x1, y1]]
ELSE controlGame.ballCatchable ← [absolute[player.x, player.y]];
controlGame.ballRange ← controlGame.ballRange + 2;
controlGame.ballCarrier ← none;
controlGame.state ← pass;
controlGame.pass ← pass;
};
};
PossibleGround:
PROC[player: Player, team: Team]
RETURNS[grounded:
BOOL] = {
grounded ← NOT CrossLine[player.x, controlGame.scrimmage, team, controlGame.quarter];
IF controlGame.possessor # controlGame.offense THEN grounded ← FALSE;
passerX ← player.x;
IF grounded
THEN
FOR i: Position
IN Players
DO
IF TeamOf[i] = TeamOf[player.position] THEN LOOP;
IF ABS[controlGame.player[i].x - player.x] > 3 THEN LOOP;
IF ABS[controlGame.player[i].y - player.y] > 3 THEN LOOP;
RETURN[TRUE];
ENDLOOP;
RETURN[FALSE];
};
passerX: REAL;
ballSpeed: REAL ← 1;
ballRandom: REAL ← 1.0;
grounded: BOOL ← FALSE;
RandomDelta:
PROC [scale:
REAL]
RETURNS [x,y:
REAL ← 0.0] = {
time: BasicTime.Pulses = BasicTime.GetClockPulses[];
low: CARDINAL = Basics.LowHalf[time];
SELECT low MOD 3 FROM 1 => x ← scale; 2 => x ← -scale; ENDCASE;
SELECT (low / 3) MOD 3 FROM 1 => y ← scale; 2 => y ← -scale; ENDCASE;
};
LiveBall:
PROC = {
controlGame.state ← liveBall;
IF controlGame.ballRange # 0
THEN {
x, y: REAL;
scale: REAL = 5/controlGame.ballRange;
select a random direction
[x,y] ← RandomDelta[scale];
move the ball in that direction
x ← controlGame.player[ball].x + scale*x;
y ← controlGame.player[ball].y + scale*y;
controlGame.ballRange ← 2*controlGame.ballRange/3;
IF controlGame.ballRange < 1 THEN controlGame.ballRange ← 0;
controlGame.ballTarget ← controlGame.ballCatchable ← [absolute[x, y]];
};
};
MoveBall:
PROC[player: Player, x, y:
REAL] = {
rt, dx, dy: REAL;
dx ← x - player.x;
dy ← y - player.y;
IF dx = 0 AND dy = 0 THEN RETURN;
rt ← RealFns.SqRt[dx*dx + dy*dy];
player.x ← player.x + (IF rt <= ballSpeed THEN dx ELSE dx*ballSpeed/rt);
player.y ← player.y + (IF rt <= ballSpeed THEN dy ELSE dy*ballSpeed/rt);
IF controlGame.state = pass AND rt < controlGame.ballRange THEN controlGame.state ← catchable;
IF grounded
AND controlGame.state = catchable
THEN
FOR i: Position
IN Players
DO
IF TeamOf[i] # controlGame.possessor THEN LOOP;
IF ABS[controlGame.player[i].x - controlGame.player[ball].x] > 4 THEN LOOP;
IF ABS[controlGame.player[i].y - controlGame.player[ball].y] > 4 THEN LOOP;
grounded ← FALSE;
ENDLOOP;
};
CatchBall:
PROC = {
delta: REAL ← 10;
receiver, ball: Player;
closest: Position ← none;
IF controlGame.state = pass THEN RETURN;
ball ← @controlGame.player[ball];
FOR i: Position
IN Players
DO
receiver ← @controlGame.player[i];
IF ~Catch[receiver, ball, 1.1] THEN LOOP;
IF
ABS[receiver.x - ball.x] +
ABS[receiver.y - ball.y] < delta
THEN {
delta ← ABS[receiver.x - ball.x] + ABS[receiver.y - ball.y]; closest ← i};
ENDLOOP;
IF closest = none THEN RETURN;
IF controlGame.state # option
AND ~controlGame.pass
AND TeamOf[closest] = controlGame.offense
THEN {PlayOver[controlGame.player[closest].x, TRUE]; RETURN}; -- grounding a punt
controlGame.ballCarrier ← closest;
controlGame.possessor ← TeamOf[closest];
IF controlGame.possessor # controlGame.offense THEN controlGame.state ← turnover;
};
Catch:
PROC[catcher: Player, catchee: Position, delta:
REAL ← 1]
RETURNS[
BOOL] = {
x, y: REAL;
IF catchee = ball THEN catchee ← controlGame.ballCarrier;
IF ABS[catcher.y - controlGame.player[catchee].y] > delta THEN RETURN[FALSE];
IF ABS[catcher.x - controlGame.player[catchee].x] > delta THEN RETURN[FALSE];
IF catchee = ball AND Blocked[catcher] THEN RETURN[FALSE];
IF catchee = ball
THEN {
-- has to be moving toward the receiver
[x, y] ← GetTarget[controlGame.ballTarget, none];
IF x = controlGame.player[ball].x AND y = controlGame.player[ball].y THEN RETURN[TRUE];
IF x < catcher.x AND catcher.x < controlGame.player[ball].x THEN RETURN[TRUE];
IF x > catcher.x AND catcher.x > controlGame.player[ball].x THEN RETURN[TRUE];
IF y < catcher.y AND catcher.y < controlGame.player[ball].y THEN RETURN[TRUE];
IF y > catcher.y AND catcher.y > controlGame.player[ball].y THEN RETURN[TRUE];
RETURN[FALSE]};
RETURN[TRUE];
};
******************************************************************
end of play computations
******************************************************************
PlayOver:
PROC[scrimmage:
REAL, stopClock:
BOOL ←
FALSE] = {
controlGame.clockStopped ← stopClock;
check for incomplete pass, penalties, and scoring
IF controlGame.ballCarrier = none
AND controlGame.pass
AND ~controlGame.lateral
THEN scrimmage ← controlGame.scrimmage;
scrimmage ← HandlePenalties[scrimmage];
IF EndZone[scrimmage] THEN Score[scrimmage];
did the gun go off?
IF controlGame.clock <= 0
THEN {
controlGame.clock ← 15*60;
controlGame.clockStopped ← TRUE;
controlGame.quarter ← controlGame.quarter + 1;
IF controlGame.quarter = 3
OR controlGame.quarter = 5
THEN {OffField[]; controlGame.timeouts ← [4, 4]; RETURN};
scrimmage ← 100 - scrimmage;
controlGame.scrimmage ← 100 - controlGame.scrimmage;
controlGame.firstDownMarker ← 100 - controlGame.firstDownMarker};
IF EndZone[scrimmage] THEN {Wait[60]; KickOff[Opponent[controlGame.possessor]]; RETURN};
was there a turnover on the play?
controlGame.scrimmage ← scrimmage;
IF controlGame.possessor # controlGame.offense
THEN {
controlGame.offense ← controlGame.possessor;
FirstDown[]};
did they make the critical first down?
IF CrossLine[scrimmage, controlGame.firstDownMarker,
controlGame.offense, controlGame.quarter] THEN FirstDown[];
IF controlGame.down = 5
THEN {
controlGame.offense ← Opponent[controlGame.offense];
controlGame.possessor ← controlGame.offense;
FirstDown[]};
Wait[60]; Huddle[];
};
HandlePenalties:
PROC[scrimmage:
REAL]
RETURNS[
REAL] = {
IF grounded AND controlGame.possessor # controlGame.offense THEN grounded ← FALSE; -- interception
IF grounded THEN {controlGame.penalties[controlGame.offense] ← grounding; grounded ← FALSE};
double penalties
IF controlGame.penalties[home] = offSides
AND controlGame.penalties[visitors] = offSides
THEN
{controlGame.penaltyState ← canceled; RETURN[controlGame.scrimmage]};
IF controlGame.penalties[home] # none
AND controlGame.penalties[visitors] # none
THEN
{controlGame.down ← controlGame.down + 1; controlGame.penaltyState ← canceled; RETURN[controlGame.scrimmage]};
single penalties
FOR team: Team
IN Team
DO
SELECT controlGame.penalties[team]
FROM
none => NULL;
offSides => RETURN[SetPenalty[team, 5]];
delayOfGame => RETURN[IF Accepted[] THEN SetPenalty[team, 5] ELSE scrimmage];
forwardPass => IF Accepted[] THEN RETURN[SetPenalty[team, 15]];
grounding => IF Accepted[] THEN RETURN[SetPenalty[team, 15]];
ENDCASE => IF Accepted[] THEN RETURN[SetPenalty[team, 5]];
ENDLOOP;
controlGame.down ← controlGame.down + 1;
RETURN[scrimmage];
};
Accepted:
PROC
RETURNS[
BOOL] = {
controlGame.penaltyState ← asking;
WHILE controlGame.penaltyState = asking DO Wait[10]; ENDLOOP;
RETURN[controlGame.penaltyState = accepted];
};
SetPenalty:
PROC[team: Team, yards:
REAL]
RETURNS[line:
REAL] = {
controlGame.penaltyState ← accepted;
IF Direction[team, controlGame.quarter] = 1
THEN
IF controlGame.scrimmage <= yards
THEN RETURN[(controlGame.scrimmage+1)/2]
ELSE RETURN[controlGame.scrimmage - yards]
ELSE
IF (100 - controlGame.scrimmage) <= yards
THEN RETURN[(100 + controlGame.scrimmage)/2]
ELSE RETURN[controlGame.scrimmage + yards];
};
Score:
PROC[scrimmage:
REAL] = {
goal: INTEGER;
opponent: Team;
controlGame.clockStopped ← TRUE;
goal ← Goal[controlGame.possessor, controlGame.quarter];
opponent ← Opponent[controlGame.possessor];
IF controlGame.ballCarrier = none
THEN {
-- check for field goal
IF scrimmage IN [-9..109] THEN RETURN;
IF controlGame.player[ball].y NOT IN [fieldWidth/3..2*fieldWidth/3] THEN RETURN};
SELECT
TRUE
FROM
controlGame.ballCarrier = none
AND goal > 50
AND scrimmage < 50 =>
controlGame.score[controlGame.possessor] ← controlGame.score[controlGame.possessor] + 3;
controlGame.ballCarrier = none
AND goal < 50
AND scrimmage > 50 =>
controlGame.score[controlGame.possessor] ← controlGame.score[controlGame.possessor] + 3;
goal > 50
AND scrimmage < 50 =>
controlGame.score[controlGame.possessor] ← controlGame.score[controlGame.possessor] + 7;
goal < 50
AND scrimmage > 50 =>
controlGame.score[controlGame.possessor] ← controlGame.score[controlGame.possessor] + 7;
goal > 50
AND scrimmage > 50 =>
controlGame.score[opponent] ← controlGame.score[opponent] + 2;
goal < 50
AND scrimmage < 50 =>
controlGame.score[opponent] ← controlGame.score[opponent] + 2;
ENDCASE;
};
******************************************************************
simple plays
******************************************************************
SetOffField:
PROC = {
player: Player;
command: ARRAY [0..6) OF Command;
command ← offField1;
FOR i:
CARDINAL
IN [0..6)
DO
player ← @controlGame.player[Add[HQB, i]];
WITH t: command[i].target
SELECT
FROM
absolute => {player.x ← t.x; player.y ← t.y};
ENDCASE => ERROR;
ENDLOOP;
command ← offField2;
FOR i:
CARDINAL
IN [0..6)
DO
player ← @controlGame.player[Add[VQB, i]];
WITH t: command[i].target
SELECT
FROM
absolute => {player.x ← t.x; player.y ← t.y};
ENDCASE => ERROR;
ENDLOOP;
OffField[];
};
offField1: Commands = [
[run, [absolute[23, 55]]], [run, [absolute[26, 55]]], [run, [absolute[29, 55]]],
[run, [absolute[32, 55]]], [run, [absolute[35, 55]]], [run, [absolute[38, 55]]]];
offField2: Commands = [
[run, [absolute[77, -5]]], [run, [absolute[74, -5]]], [run, [absolute[71, -5]]],
[run, [absolute[68, -5]]], [run, [absolute[65, -5]]], [run, [absolute[62, -5]]]];
Init[];
} . . .