canvas2pdf/demo.html at master · ApryseSDK/canvas2pdf · GitHub

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
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport"
          content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1">
    <title>Canvas2PDF Demo</title>
    <script src="lib/pdfkit.js"></script>
    <script src="lib/blob-stream.js"></script>
    <script src="canvas2pdf.js"></script>
    <style>.CodeMirror {
        border: 1px solid black;
        margin-right: 20px;
        display: inline-block;
        vertical-align: top;
    }</style>
</head>
<body>
<h1>Canvas2PDF Demo</h1>
<div>
    <label>Load Example: </label>
<select id="example_picker">
    <option value="editor_source">Clock</option>
    <option value="image_example">Image</option>
</select>
</div>
<br />
<textarea id="editor_source">
// from https://www.w3schools.com/graphics/tryit.asp?filename=trycanvas_clock_hands
var radius = 200;
ctx.translate(radius, radius);
radius = radius * 0.90
drawClock();
ctx.end();

function drawClock() {
  drawFace(ctx, radius);
  drawNumbers(ctx, radius);
  drawTime(ctx, radius);
}

function drawFace(ctx, radius) {
  var grad = ctx.createRadialGradient(0,0,radius*0.95, 0,0,radius*1.05);
  grad.addColorStop(0, '#333');
  grad.addColorStop(0.5, 'white');
  grad.addColorStop(1, '#333');
  ctx.strokeStyle = grad;
  ctx.lineWidth = radius*0.1;
  ctx.arc(0, 0, radius, 0, 2*Math.PI);

  ctx.stroke();
  ctx.beginPath();
  ctx.arc(0, 0, radius*0.1, 0, 2*Math.PI);
  ctx.fillStyle = '#333';
  ctx.fill();
}

function drawNumbers(ctx, radius) {
  var ang;
  var num;
  ctx.font = radius*0.15 + "px Helvetica";
  ctx.textBaseline="middle";
  ctx.textAlign="center";
  for(num = 1; num < 13; num++){
    ang = num * Math.PI / 6;
    ctx.rotate(ang);
    ctx.translate(0, -radius*0.85);
    ctx.rotate(-ang);
    ctx.fillText(num.toString(), 0, 0);
    ctx.rotate(ang);
    ctx.translate(0, radius*0.85);
    ctx.rotate(-ang);
  }
}

function drawTime(ctx, radius){
    var now = new Date();
    var hour = now.getHours();
    var minute = now.getMinutes();
    var second = now.getSeconds();
    //hour
    hour=hour%12;
    hour=(hour*Math.PI/6)+
    (minute*Math.PI/(6*60))+
    (second*Math.PI/(360*60));
    drawHand(ctx, hour, radius*0.5, radius*0.07);
    //minute
    minute=(minute*Math.PI/30)+(second*Math.PI/(30*60));
    drawHand(ctx, minute, radius*0.8, radius*0.07);
    // second
    second=(second*Math.PI/30);
    drawHand(ctx, second, radius*0.9, radius*0.02);
}

function drawHand(ctx, pos, length, width) {
    ctx.beginPath();
    ctx.lineWidth = width;
    ctx.lineCap = "round";
    ctx.moveTo(0,0);
    ctx.rotate(pos);
    ctx.lineTo(0, -length);
    ctx.stroke();
    ctx.rotate(-pos);
}


</textarea>

<textarea id="image_example" style="display:none;">
var image = new Image();
image.crossOrigin = 'Anonymous';
image.src = 'https://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Tiger_in_Ranthambhore.jpg/220px-Tiger_in_Ranthambhore.jpg';
image.onload = function () {
    ctx.drawImage(image, 0, 0);
    ctx.end();
};
</textarea>

<iframe style="border:1px solid black;" width="600" height="775">
</iframe>
<script src="lib/codemirror.js"></script>
<link rel="stylesheet" href="lib/codemirror.css">
<script type="text/javascript">
  var examplePicker = document.getElementById('example_picker');
  examplePicker.onchange = function () {
   editor.setValue(document.getElementById(examplePicker.value).value)
  };
  var editor = CodeMirror.fromTextArea(document.getElementById('editor_source'), {
    lineNumbers: true,
  });
  editor.setSize(600, 775);
  var iframe = document.querySelector('iframe');
  var createPdf = function () {
    var text = editor.getValue();
    var stream = blobStream();
    var ctx = new canvas2pdf.PdfContext(stream);
    eval(text);

    ctx.stream.on('finish', function () {
      iframe.src = ctx.stream.toBlobURL('application/pdf');
    });

  };
  editor.on('changes', function () {
    createPdf();
  });
  createPdf();
</script>


</body>
</html>