Snippets
Browse Code Snippets

tool - draw angle

HTML
[Edit]
+
0
-
0

Tool - draw angle

nickkk0nickkk0
647
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

<!doctype html>
<html>
<head>
  <style>

    .field {
        width: 300px;
        display: flex;
    }

    .label {
        flex: 0;
    }

    .value {
        flex: 1;
    }

    .block {
        width: 100%;
        display: block;
    }

    .canvas {
        border: 1px solid gray;
    }

  </style>
</head>
<body>
  <div class="field">
    <div class="label">Angle: </div>
    <div class="value">
      <input class="block" id="value" type="number" min="0" max="360" oninput="handleValueChange()" />
      <input class="block" id="range" type="range" min="0" max="360" oninput="handleRangeChange()" />
    </div>
    <div class="label">[degrees]</div>
  </div>
  <canvas class="canvas" id="canvas" width="300" height="300"></canvas>
  <script>

    const angle = 30;  // initial angle

    const hValue = document.querySelector('#value');
    const hRange = document.querySelector('#range');
    const hCanvas = document.querySelector('#canvas');
    
    const context = hCanvas.getContext('2d');

    const RADIAN = Math.PI / 180.0;
    const X = 0.5 * canvas.width;
    const Y = 0.5 * canvas.height;
    const RADIUS = 0.24 * canvas.width + 0.24 * canvas.height;

    hValue.value = angle;
    hRange.value = angle;

    const redrawAngle = (angle) => {
        const tmp = -RADIAN * angle;
        context.beginPath();
        context.clearRect(0, 0, canvas.width, canvas.height);
        context.fill();
        context.beginPath();
        context.strokeStyle = '#0000ff';
        context.moveTo(X + RADIUS, Y);
        context.lineTo(X, Y);
        context.lineTo(X + RADIUS * Math.cos(tmp), Y + RADIUS * Math.sin(tmp));
        context.stroke();
        context.beginPath();
        context.strokeStyle = '#ff0000';
        context.arc(X, Y, 0.2 * RADIUS, tmp, 0);
      	context.stroke();
    };

    redrawAngle(angle);

    const handleValueChange = () => {
        const angle = parseFloat(hValue.value);
        hRange.value = angle;
        redrawAngle(angle);
    };

    const handleRangeChange = () => {
        const angle = parseFloat(hRange.value);
        hValue.value = angle;
        redrawAngle(angle);
    };

  </script>
</body>
</html>
Reset