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817 lines (737 loc) · 35.8 KB
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<html>
<head>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>
<style>
body {
padding: 5px 10px;
}
.flex-container {
display: grid;
grid-template-rows: 425px 425px;
grid-template-columns: 40% 60%;
}
.code-div {
grid-row: 1;
grid-column: 1;
}
.array-div {
grid-row: 1;
grid-column: 2;
}
.stack-div {
grid-row: 2;
grid-column: 1;
}
.tree-div {
grid-row: 2;
grid-column: 2;
}
.button-span {
float: right;
}
.highlight {
background-color: yellow;
}
.array-state-index-grid-container {
display: grid;
grid-template-columns: 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px;
grid-template-rows: 24px;
}
.array-state-grid-container {
display: grid;
grid-template-columns: 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px 40px;
grid-template-rows: 34px 34px 34px 34px 34px 34px 34px;
grid-row-gap: 20px;
}
.array-state-grid-item {
border: 1px solid black;
padding-top: 6px;
padding-bottom: 6px;
text-align: center;
}
.array-state-grid-index {
padding-top: 5px;
text-align: center;
}
.array-state-grid-step {
border-bottom: 1px solid black;
border-top: 1px solid white;
padding-top: 10px;
padding-bottom: 10px;
text-align: left;
}
.call-stack-grid-container {
display: grid;
grid-template-columns: 100%;
grid-template-rows: 38px 38px 38px 38px 38px 38px 38px 38px 38px 38px;
width: 70%;
border: 1px solid black;
margin-left: auto;
margin-right: auto;
text-align: center;
font-size: 30px;
}
.call-stack-item {
border-top: 1px solid black;
}
.tree-canvas {
display: block;
margin-top: -50px;
}
</style>
</head>
<body>
<h1>
Merge Sort
<span class="button-span">
<div class="btn-group">
<button class="btn btn-info" disabled="true">Speed:</button>
<div class="btn-group btn-group-toggle" data-toggle="buttons">
<label class="btn btn-info active">
<input type="radio" name="speed" id="option1" value="1" checked> 1x
</label>
<label class="btn btn-info">
<input type="radio" name="speed" id="option2" value="2"> 2x
</label>
<label class="btn btn-info">
<input type="radio" name="speed" id="option3" value="4"> 4x
</label>
<label class="btn btn-info">
<input type="radio" name="speed" id="option4" value="8"> 8x
</label>
</div>
</div>
<button id="play_button" class="btn btn-success">
<svg class="bi bi-play-fill" width="1em" height="1em" viewBox="0 0 16 16" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
<path d="M11.596 8.697l-6.363 3.692c-.54.313-1.233-.066-1.233-.697V4.308c0-.63.692-1.01 1.233-.696l6.363 3.692a.802.802 0 0 1 0 1.393z"/>
</svg>
Play
</button>
<button id="pause_button" class="btn btn-warning" style="display: none;">
<svg class="bi bi-pause-fill" width="1em" height="1em" viewBox="0 0 16 16" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
<path d="M5.5 3.5A1.5 1.5 0 0 1 7 5v6a1.5 1.5 0 0 1-3 0V5a1.5 1.5 0 0 1 1.5-1.5zm5 0A1.5 1.5 0 0 1 12 5v6a1.5 1.5 0 0 1-3 0V5a1.5 1.5 0 0 1 1.5-1.5z"/>
</svg>
Pause
</button>
<button id="reset_button" class="btn btn-danger">
<svg class="bi bi-arrow-clockwise" width="1em" height="1em" viewBox="0 0 16 16" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" d="M3.17 6.706a5 5 0 0 1 7.103-3.16.5.5 0 1 0 .454-.892A6 6 0 1 0 13.455 5.5a.5.5 0 0 0-.91.417 5 5 0 1 1-9.375.789z"/>
<path fill-rule="evenodd" d="M8.147.146a.5.5 0 0 1 .707 0l2.5 2.5a.5.5 0 0 1 0 .708l-2.5 2.5a.5.5 0 1 1-.707-.708L10.293 3 8.147.854a.5.5 0 0 1 0-.708z"/>
</svg>
Reset
</button>
<button id="backward_button" class="btn btn-primary">
<svg class="bi bi-chevron-left" width="1em" height="1em" viewBox="0 0 16 16" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" d="M11.354 1.646a.5.5 0 0 1 0 .708L5.707 8l5.647 5.646a.5.5 0 0 1-.708.708l-6-6a.5.5 0 0 1 0-.708l6-6a.5.5 0 0 1 .708 0z"/>
</svg>
Step Backward
</button>
<button id="forward_button" class="btn btn-primary">
Step Forward
<svg class="bi bi-chevron-right" width="1em" height="1em" viewBox="0 0 16 16" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" d="M4.646 1.646a.5.5 0 0 1 .708 0l6 6a.5.5 0 0 1 0 .708l-6 6a.5.5 0 0 1-.708-.708L10.293 8 4.646 2.354a.5.5 0 0 1 0-.708z"/>
</svg>
</button>
</span>
</h1>
<div class="flex-container">
<div class="code-div">
<h2>Code</h2>
<pre style="font-size: 12px;">
// Main entry point to sort
public static void Sort(IComparable[] a) {
IComparable[] aux = new IComparable[a.length];
<span id="sort_start">sort(a, aux, 0, a.length-1);</span>
}
// mergesort a[lo..hi] using auxiliary array aux[lo..hi]
<span id="sort_declaration">private static void sort(
IComparable[] a,
IComparable[] aux,
int lo,
int hi
) {</span>
<span id="base_case">if (hi <= lo) return</span>;
<span id="mid_point">int mid = lo + (hi - lo) / 2;</span>
<span id="sort_left">sort(a, aux, lo, mid);</span>
<span id="sort_right">sort(a, aux, mid + 1, hi);</span>
<span id="merge">merge(a, aux, lo, mid, hi);</span>
}
<!--
// stably merge a[lo .. mid] with a[mid+1 .. hi] using aux[lo .. hi]
private static void merge(IComparable[] a, IComparable[] aux, int lo, int mid, int hi) {
// copy to aux[]
for (int k = lo; k <= hi; k++) {
aux[k] = a[k];
}
// merge back to a[]
int i = lo;
int j = mid+1;
for (int k = lo; k <= hi; k++) {
if (i > mid) { // Index past left subarray max index
index[k] = aux[j++];
} else if (j > hi) { // index past right subarray max index
index[k] = aux[i++];
} else if (aux[j].compareTo(aux[i]) < 0) { // compare
index[k] = aux[j++];
} else {
index[k] = aux[i++];
}
}
}
-->
</pre>
</div>
<div class="array-div">
<h2>Array State</h2>
<div class="array-state-index-grid-container">
<div style="grid-row: 1; grid-column: 5 / 8;">S: = Step: #</div>
<div class="array-state-grid-index" style="grid-row: 1; grid-column: 9;">0</div>
<div class="array-state-grid-index" style="grid-row: 1; grid-column: 10;">1</div>
<div class="array-state-grid-index" style="grid-row: 1; grid-column: 11;">2</div>
<div class="array-state-grid-index" style="grid-row: 1; grid-column: 12;">3</div>
<div class="array-state-grid-index" style="grid-row: 1; grid-column: 13;">4</div>
<div class="array-state-grid-index" style="grid-row: 1; grid-column: 14;">5</div>
<div class="array-state-grid-index" style="grid-row: 1; grid-column: 15;">6</div>
<div class="array-state-grid-index" style="grid-row: 1; grid-column: 16;">7</div>
</div>
<div class="array-state-grid-container">
<div class="array-state-grid-step" style="grid-row: 1; grid-column: 8;">S: 0</div>
<div class="array-state-grid-item" style="grid-row: 1; grid-column: 9;">M</div>
<div class="array-state-grid-item" style="grid-row: 1; grid-column: 10;">E</div>
<div class="array-state-grid-item" style="grid-row: 1; grid-column: 11;">R</div>
<div class="array-state-grid-item" style="grid-row: 1; grid-column: 12;">G</div>
<div class="array-state-grid-item" style="grid-row: 1; grid-column: 13;">S</div>
<div class="array-state-grid-item" style="grid-row: 1; grid-column: 14;">O</div>
<div class="array-state-grid-item" style="grid-row: 1; grid-column: 15;">R</div>
<div class="array-state-grid-item" style="grid-row: 1; grid-column: 16;">T</div>
<div class="array-state-grid-step" style="grid-row: 2; grid-column: 4;">S: <span class="step_1" style="display: none;">1</span></div>
<div class="array-state-grid-item" style="grid-row: 2; grid-column: 5;"><span class="step_1" style="display: none;">M</span></div>
<div class="array-state-grid-item" style="grid-row: 2; grid-column: 6;"><span class="step_1" style="display: none;">E</span></div>
<div class="array-state-grid-item" style="grid-row: 2; grid-column: 7;"><span class="step_1" style="display: none;">R</span></div>
<div class="array-state-grid-item" style="grid-row: 2; grid-column: 8;"><span class="step_1" style="display: none;">G</span></div>
<div class="array-state-grid-step" style="grid-row: 2; grid-column: 16;">S: <span class="step_11" style="display: none;">11</span></div>
<div class="array-state-grid-item" style="grid-row: 2; grid-column: 17;"><span class="step_11" style="display: none;">S</span></div>
<div class="array-state-grid-item" style="grid-row: 2; grid-column: 18;"><span class="step_11" style="display: none;">O</span></div>
<div class="array-state-grid-item" style="grid-row: 2; grid-column: 19;"><span class="step_11" style="display: none;">R</span></div>
<div class="array-state-grid-item" style="grid-row: 2; grid-column: 20;"><span class="step_11" style="display: none;">T</span></div>
<div class="array-state-grid-step" style="grid-row: 3; grid-column: 2;">S: <span class="step_2" style="display: none;">2</span></div>
<div class="array-state-grid-item" style="grid-row: 3; grid-column: 3;"><span class="step_2" style="display: none;">M</span></div>
<div class="array-state-grid-item" style="grid-row: 3; grid-column: 4;"><span class="step_2" style="display: none;">E</span></div>
<div class="array-state-grid-step" style="grid-row: 3; grid-column: 8;">S: <span class="step_6" style="display: none;">6</span></div>
<div class="array-state-grid-item" style="grid-row: 3; grid-column: 9;"><span class="step_6" style="display: none;">R</span></div>
<div class="array-state-grid-item" style="grid-row: 3; grid-column: 10;"><span class="step_6" style="display: none;">G</span></div>
<div class="array-state-grid-step" style="grid-row: 3; grid-column: 14;">S: <span class="step_12" style="display: none;">12</span></div>
<div class="array-state-grid-item" style="grid-row: 3; grid-column: 15;"><span class="step_12" style="display: none;">S</span></div>
<div class="array-state-grid-item" style="grid-row: 3; grid-column: 16;"><span class="step_12" style="display: none;">O</span></div>
<div class="array-state-grid-step" style="grid-row: 3; grid-column: 20;">S: <span class="step_16" style="display: none;">16</span></div>
<div class="array-state-grid-item" style="grid-row: 3; grid-column: 21;"><span class="step_16" style="display: none;">R</span></div>
<div class="array-state-grid-item" style="grid-row: 3; grid-column: 22;"><span class="step_16" style="display: none;">T</span></div>
<div class="array-state-grid-step" style="grid-row: 4; grid-column: 1;">S: <span class="step_3" style="display: none;">3</span></div>
<div class="array-state-grid-item" style="grid-row: 4; grid-column: 2;"><span class="step_3" style="display: none;">M</span></div>
<div class="array-state-grid-step" style="grid-row: 4; grid-column: 4;">S: <span class="step_4" style="display: none;">4</span></div>
<div class="array-state-grid-item" style="grid-row: 4; grid-column: 5;"><span class="step_4" style="display: none;">E</span></div>
<div class="array-state-grid-step" style="grid-row: 4; grid-column: 7;">S: <span class="step_7" style="display: none;">7</span></div>
<div class="array-state-grid-item" style="grid-row: 4; grid-column: 8;"><span class="step_7" style="display: none;">R</span></div>
<div class="array-state-grid-step" style="grid-row: 4; grid-column: 10;">S: <span class="step_8" style="display: none;">8</span></div>
<div class="array-state-grid-item" style="grid-row: 4; grid-column: 11;"><span class="step_8" style="display: none;">G</span></div>
<div class="array-state-grid-step" style="grid-row: 4; grid-column: 13;">S: <span class="step_13" style="display: none;">13</span></div>
<div class="array-state-grid-item" style="grid-row: 4; grid-column: 14;"><span class="step_13" style="display: none;">S</span></div>
<div class="array-state-grid-step" style="grid-row: 4; grid-column: 16;">S: <span class="step_14" style="display: none;">14</span></div>
<div class="array-state-grid-item" style="grid-row: 4; grid-column: 17;"><span class="step_14" style="display: none;">O</span></div>
<div class="array-state-grid-step" style="grid-row: 4; grid-column: 19;">S: <span class="step_17" style="display: none;">17</span></div>
<div class="array-state-grid-item" style="grid-row: 4; grid-column: 20;"><span class="step_17" style="display: none;">R</span></div>
<div class="array-state-grid-step" style="grid-row: 4; grid-column: 22;">S: <span class="step_18" style="display: none;">18</span></div>
<div class="array-state-grid-item" style="grid-row: 4; grid-column: 23;"><span class="step_18" style="display: none;">T</span></div>
<div class="array-state-grid-step" style="grid-row: 5; grid-column: 2;">S: <span class="step_5" style="display: none;">5</span></div>
<div class="array-state-grid-item" style="grid-row: 5; grid-column: 3;"><span class="step_5" style="display: none;">E</span></div>
<div class="array-state-grid-item" style="grid-row: 5; grid-column: 4;"><span class="step_5" style="display: none;">M</span></div>
<div class="array-state-grid-step" style="grid-row: 5; grid-column: 8;">S: <span class="step_9" style="display: none;">9</span></div>
<div class="array-state-grid-item" style="grid-row: 5; grid-column: 9;"><span class="step_9" style="display: none;">G</span></div>
<div class="array-state-grid-item" style="grid-row: 5; grid-column: 10;"><span class="step_9" style="display: none;">R</span></div>
<div class="array-state-grid-step" style="grid-row: 5; grid-column: 14;">S: <span class="step_15" style="display: none;">15</span></div>
<div class="array-state-grid-item" style="grid-row: 5; grid-column: 15;"><span class="step_15" style="display: none;">O</span></div>
<div class="array-state-grid-item" style="grid-row: 5; grid-column: 16;"><span class="step_15" style="display: none;">S</span></div>
<div class="array-state-grid-step" style="grid-row: 5; grid-column: 20;">S: <span class="step_19" style="display: none;">19</span></div>
<div class="array-state-grid-item" style="grid-row: 5; grid-column: 21;"><span class="step_19" style="display: none;">R</span></div>
<div class="array-state-grid-item" style="grid-row: 5; grid-column: 22;"><span class="step_19" style="display: none;">T</span></div>
<div class="array-state-grid-step" style="grid-row: 6; grid-column: 4;">S: <span class="step_10" style="display: none;">10</span></div>
<div class="array-state-grid-item" style="grid-row: 6; grid-column: 5;"><span class="step_10" style="display: none;">E</span></div>
<div class="array-state-grid-item" style="grid-row: 6; grid-column: 6;"><span class="step_10" style="display: none;">G</span></div>
<div class="array-state-grid-item" style="grid-row: 6; grid-column: 7;"><span class="step_10" style="display: none;">M</span></div>
<div class="array-state-grid-item" style="grid-row: 6; grid-column: 8;"><span class="step_10" style="display: none;">R</span></div>
<div class="array-state-grid-step" style="grid-row: 6; grid-column: 16;">S: <span class="step_20" style="display: none;">20</span></div>
<div class="array-state-grid-item" style="grid-row: 6; grid-column: 17;"><span class="step_20" style="display: none;">O</span></div>
<div class="array-state-grid-item" style="grid-row: 6; grid-column: 18;"><span class="step_20" style="display: none;">R</span></div>
<div class="array-state-grid-item" style="grid-row: 6; grid-column: 19;"><span class="step_20" style="display: none;">S</span></div>
<div class="array-state-grid-item" style="grid-row: 6; grid-column: 20;"><span class="step_20" style="display: none;">T</span></div>
<div class="array-state-grid-step" style="grid-row: 7; grid-column: 8;">S: <span class="step_21" style="display: none;">21</span></div>
<div class="array-state-grid-item" style="grid-row: 7; grid-column: 9;"><span class="step_21" style="display: none;">E</span></div>
<div class="array-state-grid-item" style="grid-row: 7; grid-column: 10;"><span class="step_21" style="display: none;">G</span></div>
<div class="array-state-grid-item" style="grid-row: 7; grid-column: 11;"><span class="step_21" style="display: none;">M</span></div>
<div class="array-state-grid-item" style="grid-row: 7; grid-column: 12;"><span class="step_21" style="display: none;">O</span></div>
<div class="array-state-grid-item" style="grid-row: 7; grid-column: 13;"><span class="step_21" style="display: none;">R</span></div>
<div class="array-state-grid-item" style="grid-row: 7; grid-column: 14;"><span class="step_21" style="display: none;">R</span></div>
<div class="array-state-grid-item" style="grid-row: 7; grid-column: 15;"><span class="step_21" style="display: none;">S</span></div>
<div class="array-state-grid-item" style="grid-row: 7; grid-column: 16;"><span class="step_21" style="display: none;">T</span></div>
</div>
</div>
<div class="stack-div">
<h2>Call Stack</h2>
<div id="call_stack_grid_container" class="call-stack-grid-container">
<div class="call-stack-item call-stack-main-item" style="grid-row: 10; grid-column: 1;">Main</div>
<div class="call-stack-item call-stack-main-item" style="grid-row: 9; grid-column: 1;">Sort</div>
</div>
</div>
<div class="tree-div">
<h2>Call Tree</h2>
<canvas id="tree_canvas" class="tree-canvas" height="425" width="950"></canvas>
</div>
</div>
<script>
$(document).ready(function() {
var tree_canvas, tree_ctx, play_timeouts;
var code_steps, tree_code, current_step, processed_step;
var clear_everything, play_all_steps, draw, is_null;
var create_code_steps, get_current_tree_step_stacks, get_call_stack_div;
is_null = function(value) {
return (typeof value === 'undefined' || value === null);
}
tree_canvas = document.getElementById('tree_canvas');
tree_ctx = tree_canvas.getContext('2d');
tree_ctx.font = '14px courier';
tree_code = [
{
tree_code: 'sort(a, aux, 0, 7)',
tree_code_x: 0,
tree_code_y: 350,
},
// Level 2
{
tree_code: 'sort(a, aux, 0, 3)',
tree_code_x: 250,
tree_code_y: 150,
tree_line_start_x: 150,
tree_line_start_y: 350,
tree_line_end_x: 250,
tree_line_end_y: 150,
},
// Level 3
{
tree_code: 'sort(a, aux, 0, 1)',
tree_code_x: 500,
tree_code_y: 50,
tree_line_start_x: 400,
tree_line_start_y: 150,
tree_line_end_x: 500,
tree_line_end_y: 50,
},
// Level 4
{
tree_code: 'sort(a, aux, 0, 0)',
tree_code_x: 750,
tree_code_y: 25,
tree_line_start_x: 650,
tree_line_start_y: 50,
tree_line_end_x: 750,
tree_line_end_y: 25,
},
{
tree_code: 'sort(a, aux, 1, 1)',
tree_code_x: 750,
tree_code_y: 50,
tree_line_start_x: 650,
tree_line_start_y: 50,
tree_line_end_x: 750,
tree_line_end_y: 50,
},
{
tree_code: 'merge(a, aux, 0, 0, 1)',
tree_code_x: 750,
tree_code_y: 75,
tree_line_start_x: 650,
tree_line_start_y: 50,
tree_line_end_x: 750,
tree_line_end_y: 75,
},
// Level 3
{
tree_code: 'sort(a, aux, 2, 3)',
tree_code_x: 500,
tree_code_y: 150,
tree_line_start_x: 400,
tree_line_start_y: 150,
tree_line_end_x: 500,
tree_line_end_y: 150,
},
// Level 4
{
tree_code: 'sort(a, aux, 2, 2)',
tree_code_x: 750,
tree_code_y: 125,
tree_line_start_x: 650,
tree_line_start_y: 150,
tree_line_end_x: 750,
tree_line_end_y: 125,
},
{
tree_code: 'sort(a, aux, 3, 3)',
tree_code_x: 750,
tree_code_y: 150,
tree_line_start_x: 650,
tree_line_start_y: 150,
tree_line_end_x: 750,
tree_line_end_y: 150,
},
{
tree_code: 'merge(a, aux, 2, 2, 3)',
tree_code_x: 750,
tree_code_y: 175,
tree_line_start_x: 650,
tree_line_start_y: 150,
tree_line_end_x: 750,
tree_line_end_y: 175,
},
// Level 3
{
tree_code: 'merge(a, aux, 0, 1, 3)',
tree_code_x: 500,
tree_code_y: 200,
tree_line_start_x: 400,
tree_line_start_y: 150,
tree_line_end_x: 500,
tree_line_end_y: 200,
},
// Level 2
{
tree_code: 'sort(a, aux, 4, 7)',
tree_code_x: 250,
tree_code_y: 350,
tree_line_start_x: 150,
tree_line_start_y: 350,
tree_line_end_x: 250,
tree_line_end_y: 350,
},
// Level 3
{
tree_code: 'sort(a, aux, 4, 5)',
tree_code_x: 500,
tree_code_y: 250,
tree_line_start_x: 400,
tree_line_start_y: 350,
tree_line_end_x: 500,
tree_line_end_y: 250,
},
// Level 4
{
tree_code: 'sort(a, aux, 4, 4)',
tree_code_x: 750,
tree_code_y: 225,
tree_line_start_x: 650,
tree_line_start_y: 250,
tree_line_end_x: 750,
tree_line_end_y: 225,
},
{
tree_code: 'sort(a, aux, 5, 5)',
tree_code_x: 750,
tree_code_y: 250,
tree_line_start_x: 650,
tree_line_start_y: 250,
tree_line_end_x: 750,
tree_line_end_y: 250,
},
{
tree_code: 'merge(a, aux, 4, 4, 5)',
tree_code_x: 750,
tree_code_y: 275,
tree_line_start_x: 650,
tree_line_start_y: 250,
tree_line_end_x: 750,
tree_line_end_y: 275,
},
// Level 3
{
tree_code: 'sort(a, aux, 6, 7)',
tree_code_x: 500,
tree_code_y: 350,
tree_line_start_x: 400,
tree_line_start_y: 350,
tree_line_end_x: 500,
tree_line_end_y: 350,
},
// Level 4
{
tree_code: 'sort(a, aux, 6, 6)',
tree_code_x: 750,
tree_code_y: 325,
tree_line_start_x: 650,
tree_line_start_y: 350,
tree_line_end_x: 750,
tree_line_end_y: 325,
},
{
tree_code: 'sort(a, aux, 7, 7)',
tree_code_x: 750,
tree_code_y: 350,
tree_line_start_x: 650,
tree_line_start_y: 350,
tree_line_end_x: 750,
tree_line_end_y: 350,
},
{
tree_code: 'merge(a, aux, 6, 6, 7)',
tree_code_x: 750,
tree_code_y: 375,
tree_line_start_x: 650,
tree_line_start_y: 350,
tree_line_end_x: 750,
tree_line_end_y: 375,
},
// Level 3
{
tree_code: 'merge(a, aux, 4, 5, 7)',
tree_code_x: 500,
tree_code_y: 400,
tree_line_start_x: 400,
tree_line_start_y: 350,
tree_line_end_x: 500,
tree_line_end_y: 400,
},
// Level 2
{
tree_code: 'merge(a, aux, 0, 3, 7)',
tree_code_x: 250,
tree_code_y: 425,
tree_line_start_x: 150,
tree_line_start_y: 350,
tree_line_end_x: 250,
tree_line_end_y: 425,
},
];
create_code_steps = function() {
var steps = ['sort_start'];
var recursion = function(lo, hi) {
//console.log('lo:' + lo + ' hi:' + hi);
steps.push('sort_declaration');
steps.push('base_case');
if (hi <= lo) { return; }
steps.push('mid_point');
var mid = lo + Math.floor((hi - lo) / 2);
steps.push('sort_left');
recursion(lo, mid);
steps.push('return_sort_left');
steps.push('sort_right');
recursion(mid+1, hi);
steps.push('return_sort_right');
steps.push('merge');
steps.push('return_merge');
};
recursion(0, 7);
steps.push('return_sort_start');
return steps;
};
get_current_tree_step_stacks = function(step_number) {
var current_tree_step_stack = [];
var current_red_text_stack = [];
var current_tree_step = -1;
for (var i = 0; i <= step_number; i++) {
var code_step = code_steps[i];
if (code_step === 'sort_declaration' || code_step === 'merge') {
// Increase current_tree_step
current_tree_step++;
// Add step number to step stack
current_tree_step_stack.push(current_tree_step);
current_red_text_stack.push(current_tree_step);
}
if (
code_step === 'return_sort_left'
|| code_step === 'return_sort_right'
|| code_step === 'return_merge'
|| code_step === 'return_sort_start'
) {
current_red_text_stack.pop();
}
}
return {
tree_step_stack: current_tree_step_stack,
red_text_step_stack: current_red_text_stack,
};
};
get_call_stack_div = function(call_stack_number, code_line) {
return '<div class="call-stack-item call-stack-main-item" style="grid-row: ' + call_stack_number + '; grid-column: 1;">' + code_line + '</div>'
};
draw = function(step_number) {
//console.log("Step Number " + step_number)
var tree_data = get_current_tree_step_stacks(step_number);
var tree_step_stack = tree_data.tree_step_stack;
var red_text_step_stack = tree_data.red_text_step_stack;
var tree_step = tree_step_stack[tree_step_stack.length-1];
var red_text_step = red_text_step_stack[red_text_step_stack.length-1];
var code_step = code_steps[step_number];
//console.log("Step " + code_step);
code_step = (code_step === 'return_sort_left') ? 'sort_left': code_step;
code_step = (code_step === 'return_sort_right') ? 'sort_right': code_step;
code_step = (code_step === 'return_merge') ? 'merge': code_step;
code_step = (code_step === 'return_sort_start') ? 'sort_start': code_step;
$('#' + code_step).addClass('highlight');
var call_stack_number = 10;
var call_stack_div = get_call_stack_div(call_stack_number--, 'Main');
$('#call_stack_grid_container').append(call_stack_div);
call_stack_div = get_call_stack_div(call_stack_number--, 'Sort(a)');
$('#call_stack_grid_container').append(call_stack_div);
//console.log(red_text_step_stack);
for (var i = 0; i < red_text_step_stack.length; i++) {
// Add stack div to call stack grid.
var step = tree_code[red_text_step_stack[i]];
call_stack_div = get_call_stack_div(call_stack_number--, step.tree_code);
$('#call_stack_grid_container').append(call_stack_div);
}
for (var i = 0; i <= tree_step; i++) {
var step = tree_code[i];
//console.log('Tree Step Index ' + i);
//console.log('Tree Step ' + step);
text_color = '#000000';
line_color = '#000000';
if (i === red_text_step) {
text_color = '#ff0000';
}
// Draw call tree code if the data to do so exists.
if (
!is_null(step.tree_code)
&& !is_null(step.tree_code_x)
&& !is_null(step.tree_code_y)
) {
// Show the correct array state steps
var selector = '.step_' + i;
$(selector).show();
// Show the call tree steps
tree_ctx.fillStyle = text_color
tree_ctx.fillText(step.tree_code, step.tree_code_x, step.tree_code_y);
}
// Add a line between the code calls if the data to do so exists.
if (
!is_null(step.tree_line_start_x)
&& !is_null(step.tree_line_start_y)
&& !is_null(step.tree_line_end_x)
&& !is_null(step.tree_line_end_y)
) {
tree_ctx.strokeStyle = line_color;
tree_ctx.beginPath();
tree_ctx.moveTo(step.tree_line_start_x, step.tree_line_start_y);
tree_ctx.lineTo(step.tree_line_end_x, step.tree_line_end_y);
tree_ctx.stroke();
}
}
};
clear_everything = function() {
// clear all things on screen
//console.log('Clear Everything');
$('#sort_start').removeClass('highlight');
$('#sort_declaration').removeClass('highlight');
$('#base_case').removeClass('highlight');
$('#mid_point').removeClass('highlight');
$('#sort_left').removeClass('highlight');
$('#sort_right').removeClass('highlight');
$('#merge').removeClass('highlight');
for (i = 1; i < 22; i++) {
var selector = '.step_' + i;
$(selector).hide();
}
$('#call_stack_grid_container').html('');
tree_ctx.clearRect(0, 0, tree_canvas.width, tree_canvas.height);
};
$('#play_button').click(function() {
// Time for each step
var step_time = 2000;
var speed = 1;
var speed_radios = $("[name='speed']");
for (var i = 0, len = speed_radios.length; i < len; i++) {
if (speed_radios[i].checked) {
speed = $(speed_radios[i]).val();
}
}
step_time = (step_time / speed);
// Disable play button
$('#play_button').hide();
$('#pause_button').show();
$('#reset_button').prop('disabled', true);
$('#forward_button').prop('disabled', true);
$('#backward_button').prop('disabled', true);
// Reinitialize play_timeouts array
play_timeouts = [];
// For each step, set a timeout.
processed_step = (processed_step === code_steps.length) ? 0 : processed_step;
// Calculate offset for when paused in middle.
var offset = processed_step * step_time;
//console.log(processed_step);
for (current_step = processed_step; current_step < code_steps.length; current_step++) {
// Calculate timeout
var timeout = (step_time * current_step) - offset;
//console.log("Current Step " + current_step);
//console.log("Timeout " + timeout);
timeout_id = setTimeout(function(current_step) {
clear_everything();
draw(current_step);
processed_step++;
}, timeout, current_step);
// Add timeout to array of timeouts
play_timeouts.push(timeout_id);
}
// Add a timeout to re-enable the play button
var button_timeout = (step_time * code_steps.length) - offset;
timeout_id = setTimeout(function() {
//$('#play_button').prop('disabled', false);
$('#pause_button').hide();
$('#play_button').show();
$('#reset_button').prop('disabled', false);
$('#forward_button').prop('disabled', false);
$('#backward_button').prop('disabled', false);
}, button_timeout);
play_timeouts.push(timeout_id);
});
$('#pause_button').click(function() {
for (i = 0; i < play_timeouts.length; i++) {
clearTimeout(play_timeouts[i]);
}
$('#pause_button').hide();
$('#play_button').show();
$('#reset_button').prop('disabled', false);
$('#forward_button').prop('disabled', false);
$('#backward_button').prop('disabled', false);
});
$('#reset_button').click(function() {
processed_step = 0;
current_step = 0;
clear_everything();
draw(current_step);
});
$('#forward_button').click(function() {
if (processed_step + 1 < code_steps.length) {
current_step = current_step + 1;
processed_step = processed_step + 1;
}
clear_everything();
draw(processed_step);
});
$('#backward_button').click(function() {
if (processed_step - 1 >= 0) {
current_step = current_step - 1;
processed_step = processed_step - 1;
}
clear_everything();
draw(processed_step);
});
code_steps = create_code_steps();
//console.log(code_steps);
// Setup the inital display.
processed_step = 0;
current_step = 0;
clear_everything();
draw(current_step);
});
</script>
</body>
</html>