-
Notifications
You must be signed in to change notification settings - Fork 0
/
map.html
310 lines (279 loc) · 12.1 KB
/
map.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>MindMap</title>
<style>
/* 设置画布的样式 */
#container {
width: 800px;
height: 600px;
border: 1px solid black;
position: relative;
}
/* 设置SVG元素的样式 */
svg {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
}
</style>
</head>
<body>
<!-- 创建一个画布元素 -->
<div id="container"></div>
<!-- 引入修改后的mian.js文件 -->
<script>
// 使用ES6的语法
class MindMap {
constructor(options) {
this.container = options.container;
this.root = options.root;
this.style = options.style;
this.nodes = [];
this.lines = [];
this.draggingNode = null;
this.startX = 0;
this.startY = 0;
this.init();
}
createNode(text, parent) {
// 使用更有意义的变量名
let nodeElement = document.createElement("div");
nodeElement.innerText = text;
nodeElement.setAttribute("draggable", "true");
// 检查并调整节点的样式设置，确保节点有合适的宽度、高度、背景颜色、文本颜色、文本字体大小等属性，使节点可见
nodeElement.style.width = `${this.style.node.width} px`;
nodeElement.style.height = `${this.style.node.height} px`;
nodeElement.style.borderRadius = `${this.style.node.borderRadius} px`;
nodeElement.style.backgroundColor = this.style.node.backgroundColor;
nodeElement.style.color = this.style.node.color;
nodeElement.style.fontSize = `${this.style.node.fontSize} px`;
nodeElement.style.textAlign = this.style.node.textAlign;
nodeElement.style.verticalAlign = this.style.node.verticalAlign;
nodeElement.style.lineHeight = `${this.style.node.height} px`;
nodeElement.style.position = "absolute";
// 检查并调整节点的位置设置，确保节点在画布的范围内，并且不被其他节点遮挡，使节点可见
// 将一些重复的代码封装成函数
let position = this.calculateNodePosition(nodeElement, parent);
nodeElement.style.left = `${position.x} px`;
nodeElement.style.top = `${position.y} px`;
return nodeElement;
}
createLine(from, to) { // 创建线
// 使用更有意义的变量名
let lineElement = document.createElementNS(
"http://www.w3.org/2000/svg",
"line"
);
lineElement.setAttribute("stroke-width", this.style.line.width);
lineElement.setAttribute("stroke", this.style.line.color);
// 将一些重复的代码封装成函数
let position = this.calculateLinePosition(from, to);
lineElement.setAttribute("x1", position.x1);
lineElement.setAttribute("y1", position.y1);
lineElement.setAttribute("x2", position.x2);
lineElement.setAttribute("y2", position.y2);
return lineElement;
}
renderNode(node, parent) {
parent.appendChild(node);
}
renderLine(line, container) { // 渲染线
container.appendChild(line);
}
renderTree(tree, container) { // 渲染树
let node = this.createNode(tree.text, container);
this.nodes.push(node);
this.renderNode(node, container);
if (tree.children && tree.children.length > 0) {
for (let child of tree.children) {
let line = this.createLine(node, child);
this.lines.push(line);
this.renderLine(line, container);
this.renderTree(child, container);
}
}
}
render() {
this.renderTree(this.root, this.container);
}
updateLinePosition(line, nodes) { // 更新线的位置
// 使用更有意义的变量名
let from = nodes[0];
let to = nodes[1];
// 将一些重复的代码封装成函数
let position = this.calculateLinePosition(from, to);
line.setAttribute("x1", position.x1);
line.setAttribute("y1", position.y1);
line.setAttribute("x2", position.x2);
line.setAttribute("y2", position.y2);
}
//
updateAllLinesPosition() { // 更新所有线的位置
for (let i = 0; i < this.lines.length; i++) {
let line = this.lines[i];
let nodes = [this.nodes[i], this.nodes[i + 1]];
this.updateLinePosition(line, nodes);
}
}
dragStart(event) { // 拖拽开始的事件
// 使用模板字符串代替字符串拼接
console.log(`drag start: ${event.target.innerText} `);
this.draggingNode = event.target;
this.startX = event.clientX;
this.startY = event.clientY;
}
dragMove(event) { // 拖拽中的事件
if (this.draggingNode) {
console.log(`drag move: ${event.target.innerText} `);
let offsetX = event.clientX - this.startX;
let offsetY = event.clientY - this.startY;
let originX = parseInt(this.draggingNode.style.left);
let originY = parseInt(this.draggingNode.style.top);
// 检查并调整节点的位置设置，确保节点在画布的范围内，并且不被其他节点遮挡，使节点可见
// 添加一些边界检查，防止节点超出画布
let newX = Math.max(0, Math.min(originX + offsetX, this.container.offsetWidth - this.style.node
.width));
let newY = Math.max(0, Math.min(originY + offsetY, this.container.offsetHeight - this.style.node
.height));
this.draggingNode.style.left = `${newX} px`;
this.draggingNode.style.top = `${newY} px`;
this.updateAllLinesPosition();
}
}
dragEnd(event) { // 拖拽结束的事件
if (this.draggingNode) {
console.log(`drag end: ${event.target.innerText} `);
this.draggingNode = null;
}
}
addEventListeners() { // 添加事件的函数
for (let node of this.nodes) {
// 使用箭头函数代替普通函数，避免this指向问题
node.addEventListener("mousedown", (event) => {
this.dragStart(event);
});
node.addEventListener("mousemove", (event) => {
this.dragMove(event);
});
node.addEventListener("mouseup", (event) => {
this.dragEnd(event);
});
}
}
init() { // 初始化的函数
this.render();
this.addEventListeners();
}
// 计算节点的位置的函数
calculateNodePosition(nodeElement, parentElement) {
// 添加一些注释，解释一些复杂的逻辑或算法
// 获取节点的索引
let index = this.nodes.indexOf(nodeElement);
// 获取节点的层级
let level = Math.floor(Math.log2(index + 1));
// 获取节点在同一层级的兄弟节点的数量
let siblings = Math.pow(2, level);
// 获取节点在同一层级的兄弟节点中的序号
let order = index - siblings + 1;
// 计算节点的水平间距
let gapX = this.container.offsetWidth / (siblings + 1);
// 计算节点的垂直间距
let gapY = this.container.offsetHeight / (level + 2);
// 计算节点的水平坐标
let x = gapX * (order + 1) - this.style.node.width / 2;
// 计算节点的垂直坐标
let y = gapY * (level + 1) - this.style.node.height / 2;
return {
x,
y
};
}
// 计算连接线的位置的函数
calculateLinePosition(fromElement, toElement) {
// 添加一些注释，解释一些复杂的逻辑或算法
// 获取连接线起点和终点的中心坐标
let x1 = parseInt(fromElement.style.left) + this.style.node.width / 2;
let y1 = parseInt(fromElement.style.top) + this.style.node.height / 2;
let x2 = parseInt(toElement.style.left) + this.style.node.width / 2;
let y2 = parseInt(toElement.style.top) + this.style.node.height / 2;
return {
x1,
y1,
x2,
y2
};
}
}
// 创建几个思维导图节点
let root = {
text: "思维导图",
children: [{
text: "定义",
children: [{
text: "一种图形化的表示方式",
},
{
text: "用于组织和展示信息",
},
],
},
{
text: "特点",
children: [{
text: "以中心主题为核心",
},
{
text: "分支结构为主要形式",
},
{
text: "利用图像、颜色、符号等元素",
},
],
},
{
text: "作用",
children: [{
text: "激发创意思维",
},
{
text: "提高记忆效率",
},
{
text: "简化复杂问题",
},
],
},
],
};
</script>
<script>
// 获取画布元素
let container = document.getElementById("container");
// 创建一个思维导图对象
let mindMap = new MindMap({
container: container,
root: root,
style: {
node: {
width: 100,
height: 50,
borderRadius: 10,
backgroundColor: "lightblue",
color: "black",
fontSize: 16,
textAlign: "center",
verticalAlign: "middle",
},
line: {
width: 2,
color: "gray",
},
},
});
</script>
</body>
</html>