-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathppi-calc.js
174 lines (147 loc) · 7.27 KB
/
ppi-calc.js
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
function getResolution() {
document.getElementById("pixelW").value = Math.round(window.screen.width * window.devicePixelRatio);
document.getElementById("pixelH").value = Math.round(window.screen.height * window.devicePixelRatio);
}
window.onload = getResolution()
function calc() {
var pixelW, pixelH, inchD
pixelW = document.getElementById("pixelW").value
pixelH = document.getElementById("pixelH").value
inchD = document.getElementById("inchD").value
if (inchD > 0) {
//result section
//calculate ppi & physical size
var ppi, scaledPPI, mmW, mmH, equivPPI
ppi = Math.sqrt(Math.pow(pixelW, 2) + Math.pow(pixelH, 2)) / inchD
scaledPPI = Math.sqrt(Math.pow(window.screen.width, 2) + Math.pow(window.screen.height, 2)) / inchD
mmW = pixelW / ppi * 25.4
mmH = pixelH / ppi * 25.4
document.getElementById("cmW").textContent = "（" + Math.round(mmW) / 10 + " 厘米）"
document.getElementById("cmH").textContent = "（" + Math.round(mmH) / 10 + " 厘米）"
document.getElementById("cmD").textContent = "（" + Math.round(inchD * 25.4) / 10 + " 厘米）"
if (document.getElementById("isPenTile").checked == false) {
document.getElementById("ppi").textContent = "PPI=" + Math.round(ppi)
} else {
equivPPI = ppi * Math.sqrt(2/3)
document.getElementById("ppi").textContent = "PPI=" + Math.round(equivPPI) + "（PenTile等效）"
}
document.getElementById("result").style.display = "inherit"
//guess device type
var mmShorter, scaleFacLgr, scaleFacMore, meterRetina, meterImmerse, meterMax
if (parseFloat(mmW) <= parseFloat(mmH)) {
mmShorter = mmW
} else {
mmShorter = mmH
}
switch (true) {
case mmShorter >= 40 && mmShorter < 90: //Mobile Phone
var phoneFactors = [/*240p*/0.75, /*320p*/1.0, /*480p*/1.5, /*576p,640p,720p*/2.0, /*720p,SurfaceDuo*/2.5, /*1080p*/2.625, /*1080p*/2.75, /*1080p,palm*/3.0, /*1440p*/3.5, /*1440p*/3.66, /*1440p*/4.0, /*2160p*/5.25, /*2160p*/5.5, /*2160p*/6.0]
scaleFacLgr = roundToArray(ppi / 144, phoneFactors) * 100
scaleFacMore = roundToArray(ppi / 160, phoneFactors) * 100
break
case mmShorter >= 90 && mmShorter < 135: //7~9" Tab
scaleFacLgr = Math.round(ppi / 132 * 4) * 25
scaleFacMore = Math.round(ppi / 150 * 4) * 25
break
case mmShorter >= 135 && mmShorter < 155: //10" Tab
scaleFacLgr = Math.round(ppi / 128 * 4) * 25
scaleFacMore = Math.round(ppi / 144 * 4) * 25
break
case mmShorter >= 155 && mmShorter < 245: //Laptop
scaleFacLgr = Math.round(ppi / 120 * 4) * 25
scaleFacMore = Math.round(ppi / 135 * 4) * 25
break
case mmShorter >= 245 && mmShorter < 450: //Desktop Monitor
scaleFacLgr = Math.round(ppi / 96 * 4) * 25
scaleFacMore = Math.round(ppi / 120 * 4) * 25
/* meterRetina =
meterImmerse =
meterMAX =
*/ break
case mmShorter >= 450: //TV, Projector, IMAX...
scaleFacMore = scaleFacLgr = 100
/* meterRetina =
meterImmerse =
meterMAX =
*/ break
default:
scaleFacMore = scaleFacLgr = 100
}
// recommend seciton
if (scaleFacLgr > 100) { //hidpi device
document.getElementById("tooLow").textContent = ""
if (scaleFacMore < 100) {
scaleFacMore = 100
}
document.getElementById("scaleFacLgr").textContent = scaleFacLgr + "%"
document.getElementById("scaleFacMore").textContent = scaleFacMore + "%"
document.getElementById("resLgr").textContent = Math.round(pixelW / scaleFacLgr * 100) + "×" + Math.round(pixelH / scaleFacLgr * 100)
document.getElementById("resMore").textContent = Math.round(pixelW / scaleFacMore * 100) + "×" + Math.round(pixelH / scaleFacMore * 100)
document.getElementById("recommend").style.display = "inherit"
} else { //lowdpi device
document.getElementById("recommend").style.display = "none"
switch (true) { //dpi too low
case ppi < 42 && mmShorter >= 450:
document.getElementById("tooLow").innerHTML = "<br>建议拉远距离观看"
break
case ppi < 85 && mmShorter < 450:
document.getElementById("tooLow").innerHTML = "<br>建议升级高分屏"
break
default:
document.getElementById("tooLow").textContent = ""
}
}
// thisDevice section
var isThisDevice = Math.abs(pixelW - Math.round(window.screen.width * window.devicePixelRatio)) + Math.abs(pixelH - Math.round(window.screen.height * window.devicePixelRatio)) // this will allow deviations
if ( isThisDevice <= 2 ) {
document.getElementById("scaleFac").textContent = Math.round(window.devicePixelRatio * 100) + "%"
document.getElementById("res").textContent = window.screen.width + "×" + window.screen.height
const elements = document.getElementsByClassName("thisDevice");
for (const element of elements) {
const tagName = element.tagName.toLowerCase(); // 获取元素的标签名
switch (tagName) {
case 'th':
case 'td':
element.style.display = 'table-cell'; // 将 display 修改为 table-cell
break;
default:
element.style.display = 'inherit'; // 将 display 修改为 inherit
}
}
var ua = navigator.userAgent
switch (true) {
case ua.includes('Windows NT'):
case ua.includes('Macintosh'):
document.getElementById("officeScaleFac").textContent = Math.round(scaledPPI / 96 * 100) + "%"
document.getElementById("officeScale").style.display = "inherit"
break
default:
document.getElementById("officeScale").style.display = "none"
}
}
} else { //if diagonal size not set
document.getElementById("recommend").style.display = "none"
document.getElementById("ppi").textContent = "请输入屏幕对角线长度"
}
}
document.addEventListener("change", calc)
/*
Thx to Gav & ncepuzs for the following function
https://www.gavsblog.com/blog/find-closest-number-in-array-javascript
https://meta.appinn.net/t/javascript/19118/3
*/
function roundToArray(needle, haystack) {
return haystack.reduce((a, b) => {
let aDiff = Math.abs(a - needle);
let bDiff = Math.abs(b - needle);
if (aDiff == bDiff) {
return a > b ? a : b;
} else {
return bDiff < aDiff ? b : a;
}
});
}
if ('serviceWorker' in navigator) {
// register service worker
navigator.serviceWorker.register('service-worker.js');
}