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
| <!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>JS绘制五边形</title>
<style type="text/css">
.paper {
width: 600px;
height: 300px;
border-color: #E0E0E0;
border: 1px solid #DDD;
position: relative;
}
.point {
width: 1px;
height: 1px;
position: absolute;
overflow: hidden;
display: block;
zoom: 1;
}
.red {
background-color: red;
}
</style>
<script type="text/javascript">
function drawLine(point1, point2) {
var point, pointElem, paper;
pointElem = document.createElement('div');
if ('className' in pointElem) {
pointElem.className = 'point red';
}
else {
pointElem.setAttribute('class', 'point red');
}
paper = document.getElementById('paper');
var xLen = Math.abs(point2[0] - point1[0]);
var yLen = Math.abs(point2[1] - point1[1]);
var x, y, cx, cy, tox, toy, rate, rateVal, isAdd = true;
if (xLen >= yLen) {
if (point1[0] > point2[0]) { point1 = [point2, point2=point1][0]; }
if (point1[1] > point2[1]) { isAdd = false; }
x = cx = point1[0];
y = cy = point1[1];
tox = point2[0];
toy = point2[1];
rateVal = rate = parseInt( (yLen / xLen) * 1000)
for (var i=x; i<tox; i++) {
cx = i;
point = pointElem.cloneNode();
paper.appendChild(point);
point.style.left = cx + 'px';
point.style.top = cy + 'px';
rateVal += rate
if (rateVal >= 1000) {
cy += isAdd ? 1 : -1
rateVal -= 1000;
}
}
}
else {
if (point1[1] > point2[1]) { point1 = [point2, point2=point1][0]; }
if (point1[0] > point2[0]) { isAdd = false; }
x = cx = point1[0];
y = cy = point1[1];
tox = point2[0];
toy = point2[1];
rateVal = rate = parseInt( (xLen / yLen) * 1000)
for (var i=y; i<toy; i++) {
cy = i;
point = pointElem.cloneNode();
paper.appendChild(point);
point.style.left = cx + 'px';
point.style.top = cy + 'px';
point = null
rateVal += rate
if (rateVal >= 1000) {
cx += isAdd ? 1 : -1
rateVal -= 1000;
}
}
}
if (cx != tox || cy != toy) {
point = pointElem.cloneNode();
paper.appendChild(point);
point.setAttribute('style', 'left:' + tox + 'px; top:' + toy + 'px');
point = null
}
pointElem = null;
}
function getPointInfo(R, dot) {
var A = 360 / 5
var sinLen = Math.sin(A / 180 * Math.PI) * R
var cosLen = Math.cos(A / 180 * Math.PI) * R
sinLen = Math.round(sinLen)
cosLen = Math.round(cosLen)
var point1 = [dot[0], dot[1] - R]
var point2 = [dot[0] + sinLen, dot[1]- cosLen]
var point5 = [dot[0] - sinLen, dot[1] - cosLen]
var A2 = (180 - A) / 2
sinLen = Math.sin(A2 / 180 * Math.PI) * R
cosLen = Math.cos(A2 / 180 * Math.PI) * R
sinLen = Math.round(sinLen)
cosLen = Math.round(cosLen)
var point3 = [dot[0] + cosLen, dot[1] + sinLen]
var point4 = [dot[0] - cosLen, dot[1] + sinLen]
return [point1, point2, point3, point4, point5];
}
function drawShape(type, R, dot) {
var pointInfo = getPointInfo(R, dot)
var point1 = pointInfo[0];
var point2 = pointInfo[1];
var point3 = pointInfo[2];
var point4 = pointInfo[3];
var point5 = pointInfo[4];
if (type == 1) {
drawLine(point1, point2);
drawLine(point2, point3);
drawLine(point3, point4);
drawLine(point4, point5);
drawLine(point5, point1);
}
else if (type == 2){
drawLine(point1, point3);
drawLine(point3, point5);
drawLine(point5, point2);
drawLine(point2, point4);
drawLine(point1, point4);
}
}
window.onload = function () {
drawShape(1, 100, [150, 150])
drawShape(2, 100, [450, 150])
}
</script>
</head>
<body>
<div id="paper" class="paper"></div>
</body>
</html>
|
