Simulations/machine_shop.jsx at master · harrymunro/Simulations

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import React, { useState, useEffect, useRef, useCallback } from 'react';

// Simulation parameters (matching SimPy example)

const PT_MEAN = 10.0; // Avg. processing time in minutes

const PT_SIGMA = 2.0; // Sigma of processing time

const MTTF = 300.0; // Mean time to failure in minutes

const REPAIR_TIME = 30.0; // Time it takes to repair a machine

const JOB_DURATION = 30.0; // Duration of other jobs

const NUM_MACHINES = 6; // Reduced for better visualization

const SIM_SPEED = 50; // ms per simulation minute

// Random number generators

const randomNormal = (mean, sigma) => {

const u1 = Math.random();

const u2 = Math.random();

const z = Math.sqrt(-2 * Math.log(u1)) * Math.cos(2 * Math.PI * u2);

return Math.max(1, mean + sigma * z);

};

const randomExponential = (mean) => {

return -mean * Math.log(Math.random());

};

// Machine states

const WORKING = 'working';

const BROKEN = 'broken';

const WAITING = 'waiting';

// Repairman states

const REPAIRING = 'repairing';

const OTHER_JOB = 'other_job';

const IDLE = 'idle';

const MachineShopAnimation = () => {

const [simTime, setSimTime] = useState(0);

const [machines, setMachines] = useState([]);

const [repairman, setRepairman] = useState({ state: IDLE, currentMachine: null, otherJobProgress: 0 });

const [repairQueue, setRepairQueue] = useState([]);

const [eventLog, setEventLog] = useState([]);

const [isRunning, setIsRunning] = useState(false);

const [speed, setSpeed] = useState(1);

const [totalParts, setTotalParts] = useState(0);

const animationRef = useRef(null);

const lastTimeRef = useRef(0);

// Initialize machines

const initializeMachines = useCallback(() => {

const newMachines = Array.from({ length: NUM_MACHINES }, (_, i) => ({

id: i,

name: `Machine ${i + 1}`,

state: WORKING,

partsMade: 0,

partProgress: 0,

currentPartTime: randomNormal(PT_MEAN, PT_SIGMA),

timeToFailure: randomExponential(MTTF),

repairProgress: 0,

}));

setMachines(newMachines);

setRepairman({ state: OTHER_JOB, currentMachine: null, otherJobProgress: 0, otherJobTime: JOB_DURATION });

setRepairQueue([]);

setSimTime(0);

setEventLog([]);

setTotalParts(0);

}, []);

useEffect(() => {

initializeMachines();

}, [initializeMachines]);

const addEvent = useCallback((time, message, type = 'info') => {

setEventLog(prev => [...prev.slice(-19), { time: time.toFixed(1), message, type }]);

}, []);

// Main simulation loop

useEffect(() => {

if (!isRunning) return;

const simulate = (timestamp) => {

if (!lastTimeRef.current) lastTimeRef.current = timestamp;

const delta = (timestamp - lastTimeRef.current) * speed / SIM_SPEED;

lastTimeRef.current = timestamp;

if (delta > 0) {

setSimTime(prev => prev + delta);

setMachines(prevMachines => {

const newMachines = [...prevMachines];

let partsThisTick = 0;

const newBroken = [];

newMachines.forEach((machine, idx) => {

if (machine.state === WORKING) {

// Progress on current part

machine.partProgress += delta;

machine.timeToFailure -= delta;

// Check for breakdown

if (machine.timeToFailure <= 0) {

machine.state = BROKEN;

machine.timeToFailure = randomExponential(MTTF);

newBroken.push(idx);

addEvent(simTime + delta, `⚠️ ${machine.name} broke down!`, 'error');

} else if (machine.partProgress >= machine.currentPartTime) {

// Part completed

machine.partsMade += 1;

partsThisTick += 1;

machine.partProgress = 0;

machine.currentPartTime = randomNormal(PT_MEAN, PT_SIGMA);

}

} else if (machine.state === WAITING) {

// Waiting for repair, do nothing

}

});

if (partsThisTick > 0) {

setTotalParts(prev => prev + partsThisTick);

}

// Add broken machines to repair queue

if (newBroken.length > 0) {

setRepairQueue(prev => [...prev, ...newBroken]);

}

return newMachines;

});

// Handle repairman

setRepairman(prevRepairman => {

const newRepairman = { ...prevRepairman };

if (newRepairman.state === REPAIRING && newRepairman.currentMachine !== null) {

// Continue repairing

setMachines(prevMachines => {

const newMachines = [...prevMachines];

const machine = newMachines[newRepairman.currentMachine];

if (machine) {

machine.repairProgress += delta;

if (machine.repairProgress >= REPAIR_TIME) {

// Repair complete

machine.state = WORKING;

machine.repairProgress = 0;

machine.partProgress = 0;

addEvent(simTime + delta, `✅ ${machine.name} repaired!`, 'success');

newRepairman.state = IDLE;

newRepairman.currentMachine = null;

}

return newMachines;

});

} else if (newRepairman.state === OTHER_JOB) {

// Working on other job

newRepairman.otherJobProgress += delta;

if (newRepairman.otherJobProgress >= newRepairman.otherJobTime) {

newRepairman.otherJobProgress = 0;

newRepairman.otherJobTime = JOB_DURATION;

addEvent(simTime + delta, `📋 Other job completed`, 'info');

}

// Check if there are machines to repair

setRepairQueue(prevQueue => {

if (prevQueue.length > 0 && (newRepairman.state === IDLE || newRepairman.state === OTHER_JOB)) {

const machineToRepair = prevQueue[0];

newRepairman.state = REPAIRING;

newRepairman.currentMachine = machineToRepair;

if (prevRepairman.state === OTHER_JOB) {

addEvent(simTime + delta, `🔧 Repairman preempted to fix Machine ${machineToRepair + 1}`, 'warning');

} else {

addEvent(simTime + delta, `🔧 Repairman fixing Machine ${machineToRepair + 1}`, 'info');

}

setMachines(prevMachines => {

const newMachines = [...prevMachines];

if (newMachines[machineToRepair]) {

newMachines[machineToRepair].state = BROKEN;

newMachines[machineToRepair].repairProgress = 0;

}

return newMachines;

});

return prevQueue.slice(1);

}

return prevQueue;

});

// If idle and no repairs needed, do other job

if (newRepairman.state === IDLE) {

newRepairman.state = OTHER_JOB;

newRepairman.otherJobProgress = 0;

newRepairman.otherJobTime = JOB_DURATION;

}

return newRepairman;

});

}

animationRef.current = requestAnimationFrame(simulate);

};

animationRef.current = requestAnimationFrame(simulate);

return () => {

if (animationRef.current) {

cancelAnimationFrame(animationRef.current);

}

};

}, [isRunning, speed, addEvent, simTime]);

const toggleSimulation = () => {

if (!isRunning) {

lastTimeRef.current = 0;

}

setIsRunning(!isRunning);

};

const resetSimulation = () => {

setIsRunning(false);

if (animationRef.current) {

cancelAnimationFrame(animationRef.current);

}

initializeMachines();

};

const getStateColor = (state) => {

switch (state) {

case WORKING: return '#22c55e';

case BROKEN: return '#ef4444';

case WAITING: return '#f59e0b';

default: return '#6b7280';

}

};

const getRepairmanStateColor = (state) => {

switch (state) {

case REPAIRING: return '#3b82f6';

case OTHER_JOB: return '#8b5cf6';

case IDLE: return '#6b7280';

default: return '#6b7280';

}

};

return (

{/* Header */}

SimPy Machine Shop Simulation

</h1>

{NUM_MACHINES} machines producing parts • 1 repairman handling breakdowns & other jobs

</p>

</div>

{/* Controls */}

<button

onClick={toggleSimulation}

className={`px-6 py-2 rounded-lg font-semibold transition-all ${

isRunning

? 'bg-amber-500 hover:bg-amber-600'

: 'bg-green-500 hover:bg-green-600'

}`}

{isRunning ? '⏸ Pause' : '▶ Start'}

</button>

<button

onClick={resetSimulation}

className="px-6 py-2 rounded-lg font-semibold bg-slate-600 hover:bg-slate-500 transition-all"

↻ Reset

</button>

<span className="text-sm text-slate-400">Speed:</span>

<input

type="range"

min="0.5"

max="5"

step="0.5"

value={speed}

onChange={(e) => setSpeed(parseFloat(e.target.value))}

className="w-24"

<span className="text-sm font-mono w-8">{speed}x</span>

</div>

{/* Stats Bar */}

<div className="text-3xl font-bold text-blue-400">{simTime.toFixed(0)}</div>

<div className="text-xs text-slate-400 uppercase tracking-wide">Sim Minutes</div>

</div>

<div className="text-3xl font-bold text-green-400">{totalParts}</div>

<div className="text-xs text-slate-400 uppercase tracking-wide">Parts Made</div>

</div>

<div className="text-3xl font-bold text-amber-400">{repairQueue.length}</div>

<div className="text-xs text-slate-400 uppercase tracking-wide">Repair Queue</div>

</div>

{machines.filter(m => m.state === WORKING).length}/{NUM_MACHINES}

</div>

<div className="text-xs text-slate-400 uppercase tracking-wide">Working</div>

</div>

{/* Main Visualization */}

{/* Machines Grid */}

<h2 className="text-lg font-semibold mb-4 text-slate-300">Production Floor</h2>

{machines.map((machine) => (

<div

key={machine.id}

className="bg-slate-800 rounded-xl p-4 border-2 transition-all duration-300"

style={{ borderColor: getStateColor(machine.state) }}

<span className="font-semibold">{machine.name}</span>

<div

className="w-3 h-3 rounded-full animate-pulse"

style={{ backgroundColor: getStateColor(machine.state) }}

</div>

{/* Machine Icon */}

{/* Machine body */}

<rect x="8" y="20" width="48" height="36" rx="4"

fill={machine.state === BROKEN ? '#991b1b' : '#334155'}

stroke={getStateColor(machine.state)}

strokeWidth="2"

{/* Control panel */}

{/* Lights */}

{machine.state === WORKING && (

)}

</circle>

{machine.state === BROKEN && (

)}

</circle>

{/* Gears */}

{machine.state === WORKING && (

<animateTransform

attributeName="transform"

type="rotate"

from="0"

to="360"

dur="1s"

repeatCount="indefinite"

)}

{[0, 60, 120, 180, 240, 300].map((angle, i) => (

<rect

key={i}

x="-2"

y="-10"

width="4"

height="6"

fill="#64748b"

transform={`rotate(${angle})`}

))}

</g>

{/* Conveyor */}

</svg>

{/* Repair overlay */}

{repairman.currentMachine === machine.id && (

</div>

)}

</div>

{/* Status */}

<span

className="text-xs font-medium px-2 py-1 rounded-full"

style={{

backgroundColor: getStateColor(machine.state) + '33',

color: getStateColor(machine.state)

}}

{machine.state.toUpperCase()}

</span>

</div>

{/* Progress bar */}

{machine.state === WORKING && (

<div

className="h-full bg-green-500 transition-all duration-100"

style={{ width: `${(machine.partProgress / machine.currentPartTime) * 100}%` }}

</div>

)}

{machine.state === BROKEN && repairman.currentMachine === machine.id && (

<div

className="h-full bg-blue-500 transition-all duration-100"

style={{ width: `${(machine.repairProgress / REPAIR_TIME) * 100}%` }}

</div>

)}

</div>

{/* Parts counter */}

<span className="font-mono">{machine.partsMade}</span> parts

</div>

))}

</div>

{/* Right Panel */}

{/* Repairman */}

<div>

<h2 className="text-lg font-semibold mb-4 text-slate-300">Repairman</h2>

<div

className="bg-slate-800 rounded-xl p-4 border-2 transition-all"

style={{ borderColor: getRepairmanStateColor(repairman.state) }}

{repairman.state === REPAIRING ? '🔧' : repairman.state === OTHER_JOB ? '📋' : '😴'}

</div>

{repairman.state === REPAIRING

? `Repairing Machine ${repairman.currentMachine + 1}`

: repairman.state === OTHER_JOB

? 'Doing Other Jobs'

: 'Idle'}

</div>

{repairman.state === REPAIRING && repairman.currentMachine !== null && (

<div

className="h-full bg-blue-500 transition-all duration-100"

style={{

width: `${(machines[repairman.currentMachine]?.repairProgress / REPAIR_TIME) * 100}%`

}}

</div>

)}

{repairman.state === OTHER_JOB && (

<div

className="h-full bg-purple-500 transition-all duration-100"

style={{

width: `${(repairman.otherJobProgress / repairman.otherJobTime) * 100}%`

}}

</div>

)}

</div>

{repairQueue.length > 0 && (

<div className="text-xs text-slate-400 mb-1">Waiting for repair:</div>

{repairQueue.map((id) => (

M{id + 1}

</span>

))}

</div>

)}

</div>

{/* Event Log */}

<div>

<h2 className="text-lg font-semibold mb-4 text-slate-300">Event Log</h2>

{eventLog.length === 0 ? (

Start the simulation to see events...

</div>

) : (

{eventLog.map((event, idx) => (

<div

key={idx}

className={`text-xs font-mono ${

event.type === 'error' ? 'text-red-400' :

event.type === 'success' ? 'text-green-400' :

event.type === 'warning' ? 'text-amber-400' :

'text-slate-400'

}`}

<span className="text-slate-600">[{event.time}]</span> {event.message}

</div>

))}

</div>

)}

</div>

{/* Legend */}

<span className="text-slate-400">Working</span>

</div>

<span className="text-slate-400">Broken</span>

</div>

<span className="text-slate-400">Being Repaired</span>

</div>

<span className="text-slate-400">Repairman: Other Jobs</span>

</div>

{/* Footer info */}

Based on the SimPy Machine Shop example • MTTF: {MTTF} min • Repair Time: {REPAIR_TIME} min • Avg Part Time: {PT_MEAN}±{PT_SIGMA} min

</div>

);

};

export default MachineShopAnimation;

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