Initial commit

script.js

@@ -0,0 +1,207 @@
+let head;
+let requests = [];
+let currentIndex = 0;
+let seekTime = 0;
+let direction = 1; // 1 for right, -1 for left
+let animationInterval;
+
+function initialize() {
+    head = document.getElementById("head");
+    const diskTrack = document.getElementById("diskTrack");
+    const trackWidth = diskTrack.offsetWidth;
+    const headWidth = 12;
+
+    // Clear existing requests
+    const existingRequests = document.querySelectorAll(".request");
+    existingRequests.forEach((req) => req.remove());
+
+    // Get initial head position and requests
+    const initialHead = parseInt(document.getElementById("initialHead").value);
+    const requestInput = document.getElementById("requestQueue").value;
+    requests = requestInput.split(",").map((x) => parseInt(x.trim()));
+
+    // Set initial head position
+    const headPosition = (initialHead / 199) * trackWidth;
+    head.style.left = headPosition + "px";
+
+    // Place request points
+    requests.forEach((pos) => {
+        const request = document.createElement("div");
+        request.className = "request";
+        request.style.left = (pos / 199) * trackWidth + "px";
+        diskTrack.appendChild(request);
+    });
+
+    // Reset statistics
+    seekTime = 0;
+    currentIndex = 0;
+    direction = 1;
+    updateStats(initialHead);
+}
+
+function updateStats(position) {
+    document.getElementById("seekTime").textContent = seekTime;
+    document.getElementById("currentPos").textContent = position;
+}
+
+function startFCFS() {
+    reset();
+    const diskTrack = document.getElementById("diskTrack");
+    const trackWidth = diskTrack.offsetWidth;
+    const headWidth = 12;
+    const initialHead = parseInt(document.getElementById("initialHead").value);
+    let currentPosition = initialHead;
+    let currentRequestIndex = 0;
+
+    animationInterval = setInterval(() => {
+        if (currentRequestIndex >= requests.length) {
+            clearInterval(animationInterval);
+            return;
+        }
+
+        const targetPosition = requests[currentRequestIndex];
+        const targetPixel = (targetPosition / 199) * trackWidth;
+
+        seekTime += Math.abs(targetPosition - currentPosition);
+        currentPosition = targetPosition;
+
+        head.style.left = targetPixel + "px";
+
+        const requestElements = document.querySelectorAll(".request");
+        requestElements.forEach((req) => {
+            const reqPos =
+                ((parseFloat(req.style.left) - headWidth / 2) /
+                    (trackWidth - headWidth)) *
+                199;
+            if (Math.abs(reqPos - targetPosition) < 1) {
+                req.classList.add("served");
+            }
+        });
+
+        direction = currentPosition > targetPosition ? -1 : 1;
+        updateStats(targetPosition);
+        currentRequestIndex++;
+    }, 1000);
+}
+
+function startSSTF() {
+    reset();
+    const diskTrack = document.getElementById("diskTrack");
+    const trackWidth = diskTrack.offsetWidth;
+    const headWidth = 12;
+    const initialHead = parseInt(document.getElementById("initialHead").value);
+    let currentPosition = initialHead;
+    let remainingRequests = [...requests];
+
+    animationInterval = setInterval(() => {
+        if (remainingRequests.length === 0) {
+            clearInterval(animationInterval);
+            return;
+        }
+
+        let closestRequest = remainingRequests.reduce((closest, current) => {
+            let closestDistance = Math.abs(closest - currentPosition);
+            let currentDistance = Math.abs(current - currentPosition);
+            return currentDistance < closestDistance ? current : closest;
+        });
+
+        remainingRequests = remainingRequests.filter(
+            (req) => req !== closestRequest
+        );
+        const targetPixel = (closestRequest / 199) * trackWidth;
+
+        seekTime += Math.abs(closestRequest - currentPosition);
+        currentPosition = closestRequest;
+
+        head.style.left = targetPixel + "px";
+
+        const requests = document.querySelectorAll(".request");
+        requests.forEach((req) => {
+            const reqPos =
+                ((parseFloat(req.style.left) - headWidth / 2) /
+                    (trackWidth - headWidth)) *
+                199;
+            if (Math.abs(reqPos - closestRequest) < 1) {
+                req.classList.add("served");
+            }
+        });
+
+        direction = currentPosition > closestRequest ? -1 : 1;
+        updateStats(closestRequest);
+    }, 1000);
+}
+
+function startSCAN() {
+    reset();
+    const diskTrack = document.getElementById("diskTrack");
+    const trackWidth = diskTrack.offsetWidth;
+    const headWidth = 12;
+    const initialHead = parseInt(document.getElementById("initialHead").value);
+    const initialDirection = document.getElementById("scanDirection").value;
+    let currentPosition = initialHead;
+
+    let sortedRequests = [...requests].sort((a, b) => a - b);
+    let headIndex = sortedRequests.findIndex((x) => x >= initialHead);
+
+    if (headIndex === -1) headIndex = sortedRequests.length;
+
+    let scanOrder;
+    if (initialDirection === "right") {
+        scanOrder = [
+            ...sortedRequests.slice(headIndex),
+            ...sortedRequests.slice(0, headIndex).reverse(),
+        ];
+        direction = 1;
+    } else {
+        scanOrder = [
+            ...sortedRequests.slice(0, headIndex).reverse(),
+            ...sortedRequests.slice(headIndex),
+        ];
+        direction = -1;
+    }
+
+    let currentRequestIndex = 0;
+
+    animationInterval = setInterval(() => {
+        if (currentRequestIndex >= scanOrder.length) {
+            clearInterval(animationInterval);
+            return;
+        }
+
+        const targetPosition = scanOrder[currentRequestIndex];
+        const targetPixel = (targetPosition / 199) * trackWidth;
+
+        seekTime += Math.abs(targetPosition - currentPosition);
+        currentPosition = targetPosition;
+
+        head.style.left = targetPixel + "px";
+
+        const requests = document.querySelectorAll(".request");
+        requests.forEach((req) => {
+            const reqPos =
+                ((parseFloat(req.style.left) - headWidth / 2) /
+                    (trackWidth - headWidth)) *
+                199;
+            if (Math.abs(reqPos - targetPosition) < 1) {
+                req.classList.add("served");
+            }
+        });
+
+        updateStats(targetPosition);
+        currentRequestIndex++;
+    }, 1000);
+}
+
+function reset() {
+    if (animationInterval) {
+        clearInterval(animationInterval);
+    }
+    initialize();
+}
+
+function markRequestAsServed(request) {
+    request.classList.add("served");
+    request.style.animation = "pulse 0.3s ease";
+}
+
+window.onload = initialize;