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
|
<!doctype html>
<html>
<head>
<title>8seg dimension planning</title>
<style>
canvas {
}
body {
margin-left: auto;
margin-right: auto;
width: min-content;
}
#form {
max-width: 1000px;
margin-left: auto;
margin-right: auto;
display: grid;
grid-template-columns: max-content auto;
}
#form > label {
text-align: right;
padding-right: 0.5em;
}
#form > input[type="number"] {
max-width: 5em;
}
#form > input {
justify-self: start;
}
</style>
</head>
<body>
<canvas id="viz" width="1800px" height="500px">
</canvas>
<div id="form">
<label for="text">Text</label><input type="text" id="text" value="Sphinx of black quartz/judge my vow"/>
<label for="digit_width">Digit width</label><input type="number" id="digit_width" step="0.01" value="1.0">
<label for="digit_height">Digit height</label><input type="number" id="digit_height" step="0.01" value="1.6">
<label for="digit_space">Digit spacing</label><input type="number" id="digit_space" step="0.01" value="0.4">
<label for="digit_num">Number of digits</label><input type="number" id="digit_num" value="36">
<label for="leds_per_m">LEDs per meter</label><input type="number" id="leds_per_m" value="10">
<label for="individual_leds">Render individual LEDs</label><input type="checkbox" id="individual_leds">
<label for="line_width">Visualization line width</label><input type="number" id="line_width", value=0.05>
</div>
<script>
const seg_map = {
" ": 0x00,
"a": 0x2e,
"b": 0xd6,
"c": 0xd0,
"d": 0xc5,
"e": 0x59,
"f": 0x98,
"g": 0xd4,
"h": 0x8c,
"i": 0x5c,
"j": 0x78,
"k": 0x8e,
"l": 0xc0,
"m": 0xa3,
"n": 0xa5,
"o": 0xf0,
"p": 0x93,
"q": 0xf4,
"r": 0x9e,
"s": 0x55,
"t": 0xc8,
"u": 0xe0,
"v": 0x8a,
"w": 0xac,
"x": 0x0f,
"y": 0x0b,
"z": 0x5a,
"0": 0x13,
"1": 0x20,
"2": 0x16,
"3": 0x56,
"4": 0x23,
"5": 0x1c,
"6": 0x4e,
"7": 0x1a,
"8": 0x5f,
"9": 0x33,
"/": 0x0a,
"\\": 0x05,
};
function map_digit(codepoint) {
if (!seg_map.hasOwnProperty(codepoint)) {
return seg_map[" "];
}
return seg_map[codepoint];
}
function do_line(ctx, x1, y1, x2, y2, scale) {
if (document.querySelector("#individual_leds").checked) {
const leds_per_m = parseFloat(document.querySelector("#leds_per_m").value);
const dist = Math.sqrt((x2-x1)*(x2-x1) + (y2-y1)*(y2-y1));
const num_leds = dist * leds_per_m;
const d_off = (num_leds % 1.0) / 2;
for (var i=0; i<num_leds; i++) {
const frac_d = ((d_off + i)/leds_per_m);
const x = x1*scale + (x2-x1)*scale*frac_d/dist;
const y = y1*scale + (y2-y1)*scale*frac_d/dist;
ctx.moveTo(x-0.5, y-0.5);
ctx.lineTo(x+0.5, y+0.5);
}
} else {
ctx.moveTo(x1*scale, y1*scale);
ctx.lineTo(x2*scale, y2*scale);
}
}
function draw_digit(ctx, x, y, w, h, seg, scale) {
for (var i=0; i<2; i++) {
if (i == 0) {
ctx.strokeStyle = '#e00000';
} else {
ctx.strokeStyle = '#404040';
seg = ~seg;
}
ctx.beginPath();
if (seg & 0x80) {
do_line(ctx, x, y, x, y+h, scale);
}
if (seg & 0x40) {
do_line(ctx, x, y+h, x+w, y+h, scale);
}
if (seg & 0x20) {
do_line(ctx, x+w, y+h, x+w, y, scale);
}
if (seg & 0x10) {
do_line(ctx, x+w, y, x, y, scale);
}
if (seg & 0x01) {
do_line(ctx, x+w/2, y+h/2, x, y, scale);
}
if (seg & 0x02) {
do_line(ctx, x+w/2, y+h/2, x+w, y, scale);
}
if (seg & 0x08) {
do_line(ctx, x+w/2, y+h/2, x, y+h, scale);
}
if (seg & 0x04) {
do_line(ctx, x+w/2, y+h/2, x+w, y+h, scale);
}
ctx.stroke();
}
}
function update() {
const canvas = document.querySelector("#viz");
const ctx = canvas.getContext("2d");
ctx.fillStyle = '#202020';
ctx.fillRect(0, 0, canvas.width, canvas.height);
const digit_num = parseFloat(document.querySelector("#digit_num").value);
const digit_width = parseFloat(document.querySelector("#digit_width").value);
const digit_height = parseFloat(document.querySelector("#digit_height").value);
const digit_space = parseFloat(document.querySelector("#digit_space").value);
const line_width = parseFloat(document.querySelector("#line_width").value);
const text = document.querySelector("#text").value.toLowerCase();
const segs = [];
for (var codepoint of text) {
segs.push(map_digit(codepoint));
}
for (var i=0; i<digit_num; i++) {
segs.push(map_digit(" "));
}
const total_w = digit_num * digit_width + (digit_num - 1) * digit_space;
const total_h = digit_height;
const fill_factor = 0.8;
const scale = canvas.width * fill_factor / total_w;
var x = (canvas.width/scale - total_w) / 2;
var y = (canvas.height/scale - total_h) / 2;
ctx.lineWidth = scale*line_width*digit_width;
for (var i=0; i<digit_num; i++) {
draw_digit(ctx, x, y, digit_width, digit_height, segs[i], scale);
x += digit_width + digit_space;
}
}
function handle_change(evt) {
update();
}
document.querySelector("#digit_width").addEventListener('change', handle_change);
document.querySelector("#digit_height").addEventListener('change', handle_change);
document.querySelector("#digit_space").addEventListener('change', handle_change);
document.querySelector("#digit_num").addEventListener('change', handle_change);
document.querySelector("#line_width").addEventListener('change', handle_change);
document.querySelector("#leds_per_m").addEventListener('change', handle_change);
document.querySelector("#individual_leds").addEventListener('change', handle_change);
document.querySelector("#text").addEventListener('input', handle_change);
update();
</script>
</body>
</html>
|
