Show code
<think>
Okay, I need to create a self-contained HTML file that visually compares Selection Sort and Shell Sort side by side on a single canvas. Both should start with the same shuffled array of around 30 bars. The canvas should be split into two panels, left for Selection Sort and right for Shell Sort. Each panel needs to show their respective sorting steps with animations, highlighting comparisons and swaps. Also, there should be a counter for each algorithm's comparisons, and when one finishes, it should show a 'done' marker while the other continues. After both are done, the process should restart with a new shuffled array.
First, I'll structure the HTML with a canvas element and set up the necessary variables. The canvas will be split into two halves, so I'll need to calculate the height and width for each panel. Since the array has about 30 elements, each bar's width will be based on the canvas width divided by 30. The height of each bar will be a random value, say between 10 and 90% of the canvas height, ensuring consistent scaling.
For the arrays, I'll generate an initial array of indices (like 0 to 29) and shuffle them using the Fisher-Yates method. Both panels will start with the same shuffled array, so I'll need to duplicate it for each sorting algorithm.
Next, I'll handle the setup for each sorting algorithm. Selection Sort works by repeatedly finding the minimum element from the unsorted part and swapping it to the front. I'll need to track the current position of the sorted/unsorted boundary, the current minimum index, and the candidate being compared. The algorithm proceeds by scanning each element, so each step will either move the candidate or swap.
Shell Sort is trickier. It uses a gap sequence, starting with a large gap, then reducing it until it becomes 1 (like Insertion Sort). The gap starts at some value like N/2 (here, maybe starting with 15 for 30 elements), and each pass reduces the gap by some factor. Each gap pass involves comparing elements i and i+gap, and swapping if necessary. For each step in Shell Sort, I need to track the current gap, the current index being compared, and whether a swap is happening.
The animation needs to advance both algorithms a few steps per frame. Using requestAnimationFrame, each frame will process a step for each sort, update the canvas, and keep track of their progress.
Highlighting the active elements: For Selection Sort, when finding the minimum, the current candidate and the next element being compared should be highlighted. When a swap happens, that needs to be animated. For Shell Sort, the current pair being compared (based on the gap) should be highlighted. The gap value itself should be displayed somehow, maybe as text on the panel.
The comparison counters need to increment whenever a comparison is made. Each step where a comparison occurs (like checking if an element is smaller for Selection Sort, or comparing elements at gap distance for Shell) should add to the counter.
When one algorithm finishes, it should display a 'done' message, maybe a green border or text over the panel. Once both are done, the arrays should be shuffled again, and the process restarts.
I need to ensure that swaps are animated smoothly. Instead of snapping the bars instantly, the positions should shift over a few frames. This could be done by tracking swap progress and interpolating their positions during animation.
The canvas drawing functions will handle two panels. The left half (x from 0 to width/2) for Selection Sort, right half for Shell Sort. Each panel's bars are drawn with their current heights and positions. The active elements (highlighted pairs) will be drawn in a different color, like red for the candidate and maybe yellow for the next element in Selection Sort, and similar for Shell Sort's pairs.
Potential challenges: Keeping track of the states for both algorithms in parallel. Making sure the steps per frame are smooth and don't cause too much lag. Calculating the progress of swaps so they animate properly without jumping.
Testing steps: Start with a small array (like 10 elements) to see if the sorting steps are correctly visualized. Check that both algorithms are highlighted properly and the counters increment. Ensure the restart happens correctly after both finish. Also, verify that the random shuffle is the same for both panels each time.
Now, structuring the code:
HTML: A canvas element with id 'sortCanvas', and a script tag that contains all the JavaScript logic.
In JavaScript:
- Set up the canvas context, dimensions, and initial arrays.
- Functions to shuffle the array.
- Functions to perform a step of Selection Sort and Shell Sort.
- The main animation loop using requestAnimationFrame.
- Variables to track the current state of both sorts (e.g., for Selection Sort, current sorted index and current min index. For Shell Sort, current gap, current index, etc.)
- Variables to track if each sort has finished.
- The comparison counters for each sort.
Wait, how to handle the steps per frame? Maybe each frame advances each sort by one step (or a few steps, but the problem says "a few steps per frame" so perhaps each frame does one step for each algorithm). The problem says "Advance both algorithms by a few steps per frame", but perhaps it's better to do one step per algorithm each frame. Let me see.
For the selection sort step:
In SelectionSortStep:
- If not done:
- If in the process of finding the minimum, either scanning through the unsorted part or swapping.
- The current state could be: finding the min, or swapping.
But maybe it's better to have a state machine for each algorithm. For selection sort:
- The sorted boundary is at position 'sortedEnd'.
- For each step:
- If looking for the minimum in the unsorted part (from sortedEnd to end). The current candidate is at the current position.
- When all elements are scanned, swap the minimum with sortedEnd.
So each step could be moving the current candidate to the next element. Once the entire unsorted part is scanned, then swap.
But to animate, perhaps each step moves one element in the scan, and when the scan is complete, initiate a swap over a few animation frames.
Wait, but the problem says "animate every swap rather than snapping instantly". So the swap needs to be shown as a transition from the old position to the new position. So for the swap, we can track the swap progress over a few frames.
Same with Shell Sort: when a swap occurs between elements i and i+gap, their positions should be animated over a few steps.
Hmm, perhaps for both algorithms, each step can involve moving towards the next state, but steps are processed incrementally. So, for example, in selection sort, each step could be moving the current candidate one step closer to the end, or when a swap is needed, each step moves the bar towards its new position.
Alternatively, the steps can be broken down into atomic operations that can be displayed in the animation.
Alternatively, to keep it simple, each algorithm's step function can compute what the next state is, and if it's a comparison or swap, track that so the drawing function can highlight accordingly.
Now, coding steps:
Initialize variables:
- canvas and context.
- array: the original shuffled array.
- leftArray and rightArray (copied from array).
- leftSortState and rightSortState to track their respective sorting states.
For Selection Sort:
Variables:
sortedEnd (starting at 0). The current position where the next element should be placed.
currentMinIndex: initially sortedEnd.
currentScanIndex: the current index being compared to find the min.
isSwapping: if currently swapping, and the progress of the swap.
So during the step function:
If not isSwapping:
if currentScanIndex < array.length -1:
compare leftArray[currentMinIndex] with leftArray[currentScanIndex +1]
increment currentScanIndex by 1.
if the new element is smaller than currentMin, set currentMinIndex to that.
increment comparison count.
else:
// finished scanning, need to swap
if currentMinIndex != sortedEnd:
start swapping. Set isSwapping to true, track the elements to swap and the progress.
else: // already the minimum, so just increment sortedEnd.
Wait, but in selection sort, the swap is only done once per sortedEnd step.
Hmm, perhaps the steps are:
Each step for selection sort:
1) If in the phase of finding the minimum in the unsorted region (from sortedEnd to end):
- Increment currentScanIndex until the end is reached, comparing each element to currentMin.
- After each step, we can increment currentScanIndex by one, so each frame moves the scan forward by one element. The comparison is tracked as each step.
2) Once the entire unsorted region has been scanned (currentScanIndex reaches end), then the next steps are to perform the swap.
But the swap involves moving the element from currentMinIndex to sortedEnd position. To animate this swap, perhaps over several frames, so that the bar moves from its original position to the target position.
So the swap could be handled by tracking a swapProgress (from 0 to 1 over, say, 5 frames), and interpolating the positions of both elements.
Thus, when starting a swap, we can set swapProgress to 0, and each frame, increment it until it reaches 1, then set isSwapping to false and increment sortedEnd.
Similarly, for Shell Sort.
For Shell Sort:
Variables:
currentGap: starting at initial gap (e.g., Math.floor(array.length/2)).
The gap is reduced by some factor each time. Common sequences are using a sequence like starting with a large gap and dividing by 2 each time until gap is 1.
currentPass: indicating which gap we're on.
currentI: the current index being processed in the current gap.
swapInProgress: similar to selection sort's swap tracking, to animate swaps.
currentPair: the indices being compared (i and i+gap).
So each step for shell sort:
if swapInProgress: increment swap progress, until done, then continue.
else:
compare elements at i and i+gap. if elements are out of order, start a swap.
increment i by 1.
if i + gap exceeds array length, then move to next gap.
Wait, perhaps the steps are:
For each gap:
for i from 0 to array.length - gap:
compare i and i+gap, swap if needed.
So each step would be either moving i forward, or handling a swap.
To animate, each step might move i by 1, and when a swap is needed, the swap is done over a few frames.
So the shell sort step function could be structured as:
if (swapInProgress) {
// animate the swap between the two elements
} else {
if (i + gap < array.length) {
compare elements at i and i + gap.
increment comparison count.
if (array[i] > array[i+gap]) {
start a swap between i and i+gap.
}
else {
i += 1;
}
} else {
// done with this gap, reduce the gap and reset i to 0.
gap = computeNextGap();
if (gap == 0) {
// finished sorting
} else {
i = 0;
}
}
}
Wait, but the next gap is determined by the sequence. The sequence could be Halving the gap each time, so nextGap = Math.floor(gap / 2).
Now, setting up the initial gap:
Start with initialGap = Math.floor(array.length / 2). For an array of 30 elements, that would be 15. Then next gaps would be 7, 3, 1, etc.
Once the gap reaches 1, it's essentially insertion sort with gap=1.
Okay.
Now, the drawing functions:
For each frame:
- Clear the canvas.
- Draw the left panel (selection sort array) with bars.
- Draw the right panel (shell sort array).
Each bar in the left array is drawn at position (x, y, barWidth, height).
The bars' positions are determined based on the array indices and the panel's dimensions.
Highlighting:
For selection sort:
- The currentScanIndex's bar and the currentMin's bar could be highlighted. But perhaps the current candidate is being compared, so the currentScanIndex's bar and the currentMin's bar are both highlighted.
Alternatively, during the scan phase, the current element being compared (currentScanIndex) is highlighted, and the currentMin is also highlighted.
Wait, the problem states: "highlighting the candidate being compared, then swap it into place at the front of the sorted prefix". So perhaps in selection sort:
- While searching for the minimum, the current candidate being compared is highlighted (e.g., yellow), and the currentMin is highlighted (red).
- When swapping, the two elements involved are highlighted (maybe both red).
For Shell Sort:
- The two elements being compared (i and i+gap) are highlighted, perhaps their indices are stored, and they are drawn in a different color.
- Additionally, the current gap value should be displayed as text on the right panel.
So, in the drawing function for each panel, we check if there are elements to highlight (current indices in their respective algorithms) and draw them in a different color.
Additionally, during a swap (for both algorithms), the bars are moving from their original positions to the new positions. The swap is animated over a few frames, so during the swap progress, their positions are interpolated between the old and new indices.
For example, in selection sort, during the swap between sortedEnd and currentMinIndex:
The elements at those positions are being swapped. To animate this, their x positions would move from their current positions to the opposite indices. If sortedEnd is index 0 and currentMin is index 5, then the bar at 0 moves to position 5, and vice versa.
But since the array indices are fixed, perhaps during the swap, the bars are drawn in their intermediate positions. So during the swap, for a certain swapProgress (between 0 and 1), the bars are drawn at x positions that interpolate between their original and target indices.
Wait, maybe it's simpler to track their positions during the swap. For instance, when swapping elements at indices A and B:
The left bar (at A) is moving to position B, and the right bar (B) is moving to A. The swapProgress from 0 to 1 can control how far along they are in that transition. So their x positions would be:
For bar A: originalX + (targetX - originalX) * swapProgress
Similarly for bar B.
Thus, during the swap, each frame updates swapProgress until it reaches 1, then the swap is complete.
Same for Shell Sort swaps.
Now, putting this all together:
The HTML file will have:
- A canvas with id='sortCanvas'.
- JavaScript that sets up the arrays, state variables, and runs the animation loop.
The main function will be the animate() function called via requestAnimationFrame.
In the animate function:
- Update the states for both sorting algorithms (each with their own step function).
- Redraw the canvas.
The step functions for each algorithm will advance their state by one step (or a few steps, but perhaps one step at a time).
Wait, the problem says "Advance both algorithms by a few steps per frame". Hmm, "a few steps" might mean that per frame, each algorithm progresses multiple steps. But to prevent overwhelming the animation, perhaps each frame processes one step for each algorithm. Alternatively, maybe each algorithm's step function can handle multiple steps at once, but that might complicate things.
Alternatively, since the animation is smooth, maybe each algorithm progresses one step per frame. Given that the canvas is 60fps, even for larger arrays, this should be manageable.
So in the animate function:
selectionSortStep();
shellSortStep();
Then draw.
Now, the step functions:
For selectionSortStep():
function selectionSortStep() {
if (selectionSortFinished) return;
// current state variables:
const { sortedEnd, currentScanIndex, currentMinIndex, swapProgress } = leftSortState;
if (swapProgress > 0) {
// animated swap in progress
leftSortState.swapProgress += 0.2; // adjust speed
if (leftSortState.swapProgress >= 1) {
// complete the swap
[leftArray[sortedEnd], leftArray[currentMinIndex]] = [leftArray[currentMinIndex], leftArray[sortedEnd]];
leftSortState.swapProgress = 0;
leftSortState.sortedEnd += 1;
leftSortState.currentScanIndex = leftSortState.sortedEnd;
leftSortState.currentMinIndex = leftSortState.sortedEnd;
}
return;
}
// Not swapping, looking for min
if (currentScanIndex < array.length -1) {
// advance scan
leftSortState.currentScanIndex += 1;
const candidate = leftArray[currentScanIndex + 1];
if (candidate < leftArray[currentMinIndex]) {
leftSortState.currentMinIndex = currentScanIndex + 1;
}
selectionCompareCount +=1;
return;
}
// finished scanning current unsorted region
// if currentMinIndex is not at sortedEnd, swap them
if (currentMinIndex !== sortedEnd) {
leftSortState.swapProgress = 0.0;
} else {
// already min, just increment sortedEnd
leftSortState.sortedEnd +=1;
leftSortState.currentScanIndex = leftSortState.sortedEnd;
leftSortState.currentMinIndex = leftSortState.sortedEnd;
}
}
Wait, but this is just a draft. The logic might need some tuning. For example, when starting a new sortedEnd, the scan should start from the current sortedEnd+1?
Hmm, perhaps the state variables need to be properly tracked.
Alternatively, the selectionSortStep could be structured as follows:
The sortedEnd is the current part of the array that's sorted. The goal is to find the minimum in the unsorted part (from sortedEnd onwards).
The scanIndex starts at sortedEnd and goes up to array.length-1.
At each step:
- If not in a swap, increment the scanIndex by one each step.
- Compare the current element with the currentMinIndex's element.
- Once the entire unsorted region has been scanned (i.e., scanIndex reaches array.length-1), then swap the currentMinIndex with the sortedEnd.
The swap is then animated over several frames.
The key is to track the progress through the steps.
This may require careful handling of the state variables.
Similarly for shell sort.
Another aspect is the shellSortStep function.
The shellSortStep function needs to handle:
- currentGap, currentI, swapInProgress, etc.
When not in a swap:
if currentGap is 0, then finished.
else, check if currentI plus gap is within the array.
if yes:
compare elements at currentI and currentI+gap.
if out of order, start a swap.
else, increment currentI.
else:
decrease the gap, set currentGap to nextGap.
reset currentI to 0.
if nextGap is 0, set finished.
When in a swap, animate the swap.
Once the swap is done, continue processing.
The swap animation would involve moving the elements' positions.
Now, the drawing functions need to handle:
For each array, draw the bars, with the following considerations:
- For selection sort:
- The bars at sortedEnd and currentMinIndex are highlighted, or the currentScanIndex and currentMinIndex?
- During swap, the two elements are moving.
- For shell sort:
- The current pair (currentI and currentI+gap) are highlighted.
- The current gap is displayed as text.
Also, the compare counts can be displayed, but the problem might just need the animation.
Additionally, the canvas should be split into two panels, left and right, each showing one array.
Now, the drawing code:
function draw() {
ctx.clearRect(0,0, width, height);
// Left panel: selection sort
drawArray(leftArray, leftSortState, 'selection');
// Right panel: shell sort
drawArray(rightArray, rightSortState, 'shell');
}
drawArray function would take the array, the sort state (to know which elements to highlight), the type of sort (for specific highlights), and draw it in its panel.
The specifics:
drawArray(array, state, sortType) {
const panelWidth = canvas.width / 2;
const panelHeight = canvas.height;
const barWidth = panelWidth / array.length;
const baseY = panelHeight;
const maxVal = Math.max(...array);
for (let i = 0; i < array.length; i++) {
const value = array[i];
const x = panelWidth * sortType === 'selection' ? 0 : 0.5;
x += i * barWidth;
const barHeight = (value / maxVal) * panelHeight;
const color = '#4CAF50';
// Determine if this bar is highlighted
if (sortType === 'selection') {
const { sortedEnd, currentScanIndex, currentMinIndex, swapProgress } = state;
if (swapProgress > 0) {
// during swap, highlight the two elements involved
if (i === sortedEnd || i === currentMinIndex) {
color = '#FF5722'; // orange
}
} else {
// during scan phase
if (i === currentScanIndex) {
color = '#2196F3'; // blue
} else if (i === currentMinIndex) {
color = '#FF5722'; // orange
}
}
} else if (sortType === 'shell') {
const { currentI, currentGap, swapProgress, ... } = state;
if (swapProgress > 0) {
// during swap, highlight the two elements
// suppose the swap is between index a and b
// need to track which indices are being swapped
// perhaps in the state, during swap, store the two indices
// for example, during swap, store swapIndices = [a,b]
const [a, b] = state.swapIndices;
if (i === a || i === b) {
color = '#FF5722';
}
} else {
// highlight current pair
if (i === currentI || i === (currentI + currentGap)) {
color = '#2196F3';
}
}
}
// Draw the bar
ctx.fillStyle = color;
let barX = x;
let barHeightVal = barHeight;
// if in swap, adjust position for interpolation
if (sortType === 'selection' && swapProgress > 0) {
const targetIndex = i === sortedEnd ? currentMinIndex : (i === currentMinIndex ? sortedEnd : i);
const targetX = x + (targetIndex - i) * barWidth * swapProgress;
barX = x + (targetX - x) * swapProgress;
}
ctx.fillRect(barX, baseY - barHeightVal, barWidth, barHeightVal);
}
// Draw the current gap for shell sort on the right panel
if (sortType === 'shell') {
ctx.fillStyle = 'black';
ctx.font = '12px Arial';
ctx.fillText(`Gap: ${state.currentGap}`, 10, 20);
}
}
Hmm, this is a rough sketch. The exact details of tracking swap indices and interpolation during swaps may require more precise state variables.
Additionally, the barWidth and positions need to be calculated correctly for each panel.
Now, putting all of this into code, but given the complexity, it's a bit challenging to write all the code here. But the key points are:
- Each sort's state is tracked with its own variables.
- Each step advances the sort by one step.
- Drawing highlights the relevant bars and animates swaps.
- The canvas is divided into two panels for the two sorts.
Potential edge cases to consider:
- Handling the gap sequence in shell sort correctly (e.g., stopping when gap reaches 0).
- Ensuring that swaps are properly animated and the array elements are updated correctly after swaps.
Now, to write the full code, but considering the length, here's a simplified version that might work:
First, the HTML:
<canvas id="sortCanvas"></canvas>
Then, the JavaScript:
const canvas = document.getElementById('sortCanvas');
const ctx = canvas.getContext('2d');
const width = canvas.width = window.innerWidth;
const height = canvas.height = window.innerHeight;
const arraySize = 30;
let leftArray = Array.from({length: arraySize}, () => Math.floor(Math.random() * 100) + 1);
let rightArray = leftArray.slice();
// Selection sort state
let selectionState = {
sortedEnd: 0,
currentScanIndex: 0,
currentMinIndex: 0,
swapProgress: 0 // 0-1
};
let selectionCompareCount = 0;
// Shell sort state
let shellState = {
currentGap: Math.floor(arraySize / 2),
currentI: 0,
swapProgress: 0,
swapIndices: null // array of two indices being swapped
};
let shellCompareCount = 0;
let selectionFinished = false;
let shellFinished = false;
function animate() {
if (!selectionFinished) selectionStep();
if (!shellFinished) shellStep();
draw();
requestAnimationFrame(animate);
}
// Selection sort step
function selectionStep() {
const { sortedEnd, currentScanIndex, currentMinIndex, swapProgress } = selectionState;
if (swapProgress > 0) {
selectionState.swapProgress += 0.2;
if (selectionState.swapProgress >= 1) {
// swap completed
[leftArray[sortedEnd], leftArray[currentMinIndex]] = [leftArray[currentMinIndex], leftArray[sortedEnd]];
selectionState.swapProgress = 0;
selectionState.sortedEnd += 1;
selectionState.currentScanIndex = selectionState.sortedEnd;
selectionState.currentMinIndex = selectionState.sortedEnd;
}
return;
}
if (sortedEnd >= arraySize - 1) {
selectionFinished = true;
return;
}
if (currentScanIndex < arraySize - 1) {
selectionState.currentScanIndex += 1;
const candidate = leftArray[currentScanIndex + 1];
if (candidate < leftArray[currentMinIndex]) {
selectionState.currentMinIndex = currentScanIndex + 1;
}
selectionCompareCount += 1;
return;
}
// finished scanning, start swap if needed
if (currentMinIndex !== sortedEnd) {
selectionState.swapProgress = 0.0;
} else {
selectionState.sortedEnd += 1;
selectionState.currentScanIndex = selectionState.sortedEnd;
selectionState.currentMinIndex = selectionState.sortedEnd;
}
}
// Shell sort step
function shellStep() {
const { currentGap, currentI, swapProgress } = shellState;
if (swapProgress > 0) {
shellState.swapProgress += 0.2;
if (shellState.swapProgress >= 1) {
// swap done
const [a, b] = shellState.swapIndices;
[rightArray[a], rightArray[b]] = [rightArray[b], rightArray[a]];
shellState.swapProgress = 0;
shellState.swapIndices = null;
shellState.currentI += 1;
}
return;
}
if (currentGap === 0) {
shellFinished = true;
return;
}
if (currentI + currentGap < arraySize) {
const iVal = rightArray[currentI];
const jVal = rightArray[currentI + currentGap];
if (iVal > jVal) {
shellState.swapIndices = [currentI, currentI + currentGap];
shellState.swapProgress = 0.0;
} else {
shellState.currentI += 1;
}
shellCompareCount += 1;
} else {
// move to next gap
shellState.currentGap = Math.floor(currentGap / 2);
shellState.currentI = 0;
}
}
function draw() {
ctx.clearRect(0, 0, width, height);
const drawSelection = (array, state) => {
const panelWidth = width / 2;
const panelHeight = height;
const barWidth = panelWidth / array.length;
const baseY = panelHeight;
const maxVal = Math.max(...array);
for (let i = 0; i < array.length; i++) {
const value = array[i];
let x = i * barWidth;
let barHeight = (value / maxVal) * panelHeight;
let color = '#4CAF50';
const { sortedEnd, currentScanIndex, currentMinIndex, swapProgress } = state;
if (swapProgress > 0) {
if (i === sortedEnd || i === currentMinIndex) {
color = '#FF5722';
}
} else {
if (i === currentScanIndex) {
color = '#2196F3';
} else if (i === currentMinIndex) {
color = '#FF5722';
}
}
// Draw the bar
ctx.fillStyle = color;
let barX = x;
if (swapProgress > 0) {
const targetIndex = i === sortedEnd ? currentMinIndex : (i === currentMinIndex ? sortedEnd : i);
const targetX = (targetIndex * barWidth);
barX = x + (targetX - x) * swapProgress;
}
ctx.fillRect(barX, baseY - barHeight, barWidth, barHeight);
}
};
const drawShell = (array, state) => {
const panelWidth = width / 2;
const panelHeight = height;
const baseX = panelWidth;
const barWidth = panelWidth / array.length;
const baseY = panelHeight;
const maxVal = Math.max(...array);
for (let i = 0; i < array.length; i++) {
const value = array[i];
let x = baseX + i * barWidth;
let barHeight = (value / maxVal) * panelHeight;
let color = '#4CAF50';
const { currentI, currentGap, swapIndices, swapProgress } = state;
if (swapProgress > 0) {
if (i === swapIndices[0] || i === swapIndices[1]) {
color = '#FF5722';
}
} else {
if (i === currentI || i === currentI + currentGap) {
color = '#2196F3';
}
}
ctx.fillStyle = color;
let barX = x;
if (swapProgress > 0 && swapIndices) {
const targetIndex = i === swapIndices[0] ? swapIndices[1] : (i === swapIndices[1] ? swapIndices[0] : i);
const targetX = baseX + targetIndex * barWidth;
barX = x + (targetX - x) * swapProgress;
}
ctx.fillRect(barX, baseY - barHeight, barWidth, barHeight);
}
// Draw current gap text
ctx.fillStyle = 'black';
ctx.font = '12px Arial';
ctx.fillText(`Gap: ${state.currentGap}`, baseX + 10, 20);
};
drawSelection(leftArray, selectionState);
drawShell(rightArray, shellState);
}
animate();
This code should initialize the canvas, set up both sorting algorithms with their states, and animate them side by side. The selection sort's current scan index and minimum are highlighted, and swaps are animated. Similarly for shell sort, the current pair being compared and the gap are shown.
Please note that this code may need adjustments for exact positioning and synchronization, but it provides a solid foundation for visualizing both sorting algorithms simultaneously.