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sort_insertion_direct.html
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sort_insertion_direct.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>直接插入排序</title>
</head>
<body>
<canvas height="600" id="canvas1" style="background:white;" width="500"></canvas>
<script>
// 动画延时
const DELAY = 200;
// 生成数组长度
const ARR_LENGTH = 50;
const RESULT_DATA = {
// 待排序数组
arr: [],
// 当前正在交换的索引左
changeIndexLeft: 0,
// 当前正在交换的索引右
changeIndexRight: 0,
// 未排序元素最终插入位置
insertIndex: 0,
// 已排序的索引结束位置
sortedIndex: 0,
// 标记排序中
isSorting: false,
// 标记插入中
isInserting: false,
// 记录插入值大小
insertValue: 0,
};
function draw(canvas, data) {
// 获取上下文对象
let context = canvas.getContext('2d');
let maxHeight = canvas.getAttribute('height');
let width = canvas.getAttribute('width');
// 清空画布
context.clearRect(0, 0, 1500, 600);
for (let i = 0; i < data.arr.length; i++) {
if (i === data.insertIndex && data.isInserting) {
context.fillStyle = 'lightGray';
} else if (i === data.changeIndexLeft && data.isSorting) {
context.fillStyle = 'white';
} else if (i === data.changeIndexRight && data.isSorting) {
context.fillStyle = 'orange';
} else if (i <= data.sortedIndex || (i === data.sortedIndex + 1 && data.isSorting)) {
context.fillStyle = 'orange';
} else {
context.fillStyle = 'lightGray';
}
let w = width / data.arr.length;
context.fillRect(i * w, maxHeight - data.arr[i], w - 1, data.arr[i]);
}
if (data.insertValue !== 0) {
context.lineWidth = 1;
context.strokeStyle = 'lightGray';
context.beginPath();
context.moveTo(0, maxHeight - data.insertValue);
context.lineTo(width / data.arr.length * data.sortedIndex, maxHeight - data.insertValue);
context.closePath();
context.stroke();
}
}
function selectionSort() {
let statusArr = [];
statusArr.push(JSON.parse(JSON.stringify(RESULT_DATA)));
for (let i = 1; i < RESULT_DATA.arr.length; i++) {
if (RESULT_DATA.arr[i] < RESULT_DATA.arr[i - 1]) {
RESULT_DATA.insertValue = RESULT_DATA.arr[i];
let j = i - 1;
while (j >= 0 && RESULT_DATA.arr[j] > RESULT_DATA.insertValue) {
// 标记交换
RESULT_DATA.isSorting = true;
RESULT_DATA.changeIndexLeft = j;
RESULT_DATA.changeIndexRight = j + 1;
RESULT_DATA.arr[j + 1] = RESULT_DATA.arr[j--];
statusArr.push(JSON.parse(JSON.stringify(RESULT_DATA)));
}
RESULT_DATA.isInserting = true;
RESULT_DATA.arr[j + 1] = RESULT_DATA.insertValue;
RESULT_DATA.insertValue = 0;
RESULT_DATA.insertIndex = j + 1;
statusArr.push(JSON.parse(JSON.stringify(RESULT_DATA)));
RESULT_DATA.isInserting = false;
}
RESULT_DATA.sortedIndex = i;
RESULT_DATA.isSorting = false;
statusArr.push(JSON.parse(JSON.stringify(RESULT_DATA)));
}
return statusArr;
}
function run(id) {
let canvas = document.getElementById(id);
if (!canvas) {
return false;
}
// 生成随机数组
for (let i = 0; i < ARR_LENGTH; i++) {
RESULT_DATA.arr.push(Math.floor(Math.random() * 580 + 1));
}
// 排序时,保存每次变动时的属性,返回变动属性的数组
let statusArr = selectionSort();
let i = 0;
setInterval(() => {
if (i < statusArr.length) {
draw(canvas, statusArr[i]);
i++;
}
}, DELAY);
}
run('canvas1');
</script>
</body>
</html>