Html5: Drawing with text

?
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
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta charset="utf-8">
<title>Drawing with text</title>
<meta name="keywords" content="geovindu">
<meta name="description" content="涂聚文"> 
<meta name="author" content="Tim Holman">
<style type="text/css">
@import "compass/css3";
 
html, body {
  width: 100%;
  height: 100%;
  margin: 0px;
  overflow: hidden;
   
    &:hover {
   span {
      display: none;
    }
  }
}
 
canvas {
 cursor: crosshair;
   
}
 
span {
    font-family: 'Georgia', cursive;
  font-size: 40px;
 position: fixed;
  top: 50%;
  left: 50%;
  color: #000;
  margin-top: -40px;
  margin-left: -200px;
}
</style>
</head>
 
<body>
<canvas id='canvas'></canvas>
<span id='info'>Click and drag to draw!<span>
 
<!--
  Drawing with text:
   
  -  Click and drag to draw.
  -  Double click to clear.
 
  Ported from java at http://www.generative-gestaltung.de
 
  by Tim Holman - @twholman
 
-->
 
 
 
<script type="text/javascript">
//A PEN BY Tim Holman
//https://onaircode.com/awesome-html5-canvas-examples-source-code/
// Drawing with text. Ported from Generative Design book - http://www.generative-gestaltung.de - Original licence: http://www.apache.org/licenses/LICENSE-2.0
 
// Application variables
var position = {x: 0, y: window.innerHeight/2};
var counter = 0;
var minFontSize = 3;
var angleDistortion = 0;
var letters = "中国人民解放了！中国人站起来了！涂聚文(Geovin Du),明者因事而变，知者随事而制！--《盐铁论》。There was a table set out under a tree in front of the house, and the March Hare and the Hatter were having tea at it: a Dormouse was sitting between them, fast asleep, and the other two were using it as a cushion, resting their elbows on it, and talking over its head. 'Very uncomfortable for the Dormouse,' thought Alice; 'only, as it's asleep, I suppose it doesn't mind.'";
 
// Drawing variables
var canvas;
var context;
var mouse = {x: 0, y: 0, down: false}
 
function init() {
  canvas = document.getElementById( 'canvas' );
  context = canvas.getContext( '2d' );
  canvas.width = window.innerWidth;
  canvas.height = window.innerHeight;
   
  canvas.addEventListener('mousemove', mouseMove, false);
  canvas.addEventListener('mousedown', mouseDown, false);
  canvas.addEventListener('mouseup',   mouseUp,   false);
  canvas.addEventListener('mouseout',  mouseUp,  false); 
  canvas.addEventListener('dblclick', doubleClick, false);
   
  window.onresize = function(event) {
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
  }
}
 
function mouseMove ( event ){
  mouse.x = event.pageX;
  mouse.y = event.pageY;
  draw();
}
 
function draw() {
 if ( mouse.down ) {
    var d = distance( position, mouse );
    var fontSize = minFontSize + d/2;
    var letter = letters[counter];
    var stepSize = textWidth( letter, fontSize );
     
    if (d > stepSize) {
      var angle = Math.atan2(mouse.y-position.y, mouse.x-position.x);
       
      context.font = fontSize + "px Georgia";
     
      context.save();
      context.translate( position.x, position.y);
      context.rotate( angle );
      context.fillText(letter,0,0);
      context.restore();
 
      counter++;
      if (counter > letters.length-1) {
        counter = 0;
      }
     
    //console.log (position.x + Math.cos( angle ) * stepSize)
      position.x = position.x + Math.cos(angle) * stepSize;
      position.y = position.y + Math.sin(angle) * stepSize;
 
      }
  }    
}
 
function distance( pt, pt2 ){
   
  var xs = 0;
  var ys = 0;
  
  xs = pt2.x - pt.x;
  xs = xs * xs;
  
  ys = pt2.y - pt.y;
  ys = ys * ys;
  
  return Math.sqrt( xs + ys );
}
 
function mouseDown( event ){
  mouse.down = true;
  position.x = event.pageX;
  position.y = event.pageY;
   
  document.getElementById('info').style.display = 'none';
}
 
function mouseUp( event ){
    mouse.down = false;
}
 
function doubleClick( event ) {
  canvas.width = canvas.width;
}
 
function textWidth( string, size ) {
  context.font = size + "px Georgia";
   
  if ( context.fillText ) {
    return context.measureText( string ).width;
  } else if ( context.mozDrawText) {
    return context.mozMeasureText( string );
  }
   
 };
 
init();
</script>
</body>
 
</html>

　　

posted @   ®Geovin Du Dream Park™  阅读(256)  评论(0)  编辑  收藏  举报
编辑推荐：
· AI与.NET技术实操系列：基于图像分类模型对图像进行分类
· go语言实现终端里的倒计时
· 如何编写易于单元测试的代码
· 10年+ .NET Coder 心语，封装的思维：从隐藏、稳定开始理解其本质意义
· .NET Core 中如何实现缓存的预热？
阅读排行：
· 25岁的心里话
· 闲置电脑爆改个人服务器（超详细） #公网映射 #Vmware虚拟网络编辑器
· 基于 Docker 搭建 FRP 内网穿透开源项目（很简单哒）
· 零经验选手，Compose 一天开发一款小游戏！
· 一起来玩mcp_server_sqlite，让AI帮你做增删改查！！
< 2025年3月 >
日 一 二 三 四 五 六
23 24 25 26 27 28 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 1 2 3 4 5
点击右上角即可分享
微信分享提示