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image-sequence-viewer.html
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image-sequence-viewer.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Image Sequence Viewer</title>
<style>
body {
color: white;
background-color: black;
}
#viewer {
position: relative;
margin-top: 0.5em;
}
#viewer img {
position:absolute;
}
label:not(:first-child) {
margin-left: 0.5em;
}
button {
margin-left: 0.5em;
}
fieldset {
display: inline;
border: none;
}
input[type="number"] {
width: 5em;
}
#path {
width: 20em;
}
footer {
font-size: 0.5em
}
</style>
</head>
<body>
<form>
<label for="first-image">
<span>Load: </span>
</label>
<input type="file" id="first-image" name="first-image" title="Select the first image to view">
<label for="path">
<span>Path: </span>
</label>
<input type="text" id="path" name="path" placeholder="inform manually" title="The path of the images folder. You can copy it at the same time you select the first image.">
<label for="prefix">
<span>Prefix: </span>
</label>
<input type="text" id="prefix" name="prefix" title="The part of the image name before the index">
<label for="suffix">
<span>Suffix: </span>
</label>
<input type="text" id="suffix" name="suffix" title="The part of the image name after the index">
<label for="first-index">
<span>First index: </span>
</label>
<input type="number" id="first-index" name="first-index" title="The index of the first image to view">
<label for="current-index">
<span>Index: </span>
</label>
<input type="number" id="current-index" name="current-index" title="The index of the currently shown image">
<label for="index-leap">
<span>Index leap: </span>
</label>
<input type="number" id="index-leap" name="index-leap" value="1" title="The index increment between consecutive images">
<label for="filp-upside-down">
<span>Flip upside down: </span>
</label>
<input type="checkbox" id="filp-upside-down" name="filp-upside-down" title="Inverts the images vertically">
<button id="playPauseButton" type="button">Play/Pause</button>
<button id="restartButton" type="button">Restart</button>
</form>
<section>
<span id="log"></span>
</section>
<section id="viewer">
<img id="img" src="" />
</section>
<footer>version: 1.1.4</footer>
<script>
const framePeriodMillis = 42;
//global variables
let playbackStopped = true;
let currentIndex = null;
let indexLeap = 1;
let prefix = null;
let suffix = null;
let path = null;
let mouseDown = false;
let clickX;
let clickY;
let previousImageUrl;
let frameLoadStartTime;
const imgElement = document.getElementById("img");
const logElement = document.getElementById("log");
const pathInput = document.getElementById("path");
const currentIndexInput = document.getElementById("current-index");
const indexLeapInput = document.getElementById("index-leap");
const prefixInput = document.getElementById("prefix");
const suffixInput = document.getElementById("suffix");
const firstIndexInput = document.getElementById("first-index");
const firstImageInput = document.getElementById("first-image");
const flipUpsideDownInput = document.getElementById("filp-upside-down");
const playPauseButton = document.getElementById("playPauseButton");
const restartButton = document.getElementById("restartButton");
const viewerElement = document.getElementById("viewer");
const html = document.documentElement;
//functions
function log(text) {
logElement.textContent += text;
}
function clearLog() {
logElement.textContent = "";
}
function loadFormData() {
path = pathInput.value;
if (path) {
path = "file:///" + path;
}
const currentIndexInputValue = currentIndexInput.value;
if (currentIndexInputValue) {
currentIndex = parseInt(currentIndexInputValue);
}
const indexLeapInputValue = indexLeapInput.value;
if (indexLeapInputValue) {
indexLeap = parseInt(indexLeapInputValue);
}
prefix = prefixInput.value;
suffix = suffixInput.value;
if (flipUpsideDownInput.checked) {
imgElement.style.transform = "scaleY(-1)";
} else {
imgElement.style.transform = "";
}
}
function getImageUrl() {
return path + "/" + prefix + currentIndex + suffix;
}
function playPause() {
currentIndex = parseInt(currentIndexInput.value);
if (!playbackStopped) {
playbackStopped = true;
} else {
playbackStopped = false;
changeFrame();
}
}
function changeFrame() {
frameLoadStartTime = Date.now();
currentIndex += indexLeap;
const imageUrl = getImageUrl();
previousImageUrl = imgElement.getAttribute("src");
console.log(imageUrl);
imgElement.setAttribute("src", imageUrl);
currentIndexInput.value = currentIndex;
}
function updateScrollPos(e) {
html.style.cursor = "none";
html.scrollLeft += clickX - e.pageX;
html.scrollTop += clickY - e.pageY;
}
//events
imgElement.onload = function() {
if (!playbackStopped) {
let timeout = framePeriodMillis - (Date.now() - frameLoadStartTime);
if (timeout < 0) {
timeout = 0;
console.warn("lagging");
}
setTimeout(function() {
changeFrame();
}, timeout);
}
};
imgElement.onerror = function() {
if (!playbackStopped) {
log("error loading image at " + imgElement.getAttribute("src"));
playbackStopped = true;
imgElement.setAttribute("src", previousImageUrl);
}
}
firstImageInput.onchange = function() {
const imageName = this.files[0].name;
const match = /\d+(?!.*\d)/g.exec(imageName);
if (match === null) {
alert("File doesn't have a numeric index in it's name.")
} else {
const firstIndex = match[0];
const prefix = imageName.substring(0, match.index);
const suffix = imageName.substring(match.index + firstIndex.length);
prefixInput.value = prefix;
suffixInput.value = suffix;
firstIndexInput.value = firstIndex;
currentIndexInput.value = firstIndex;
loadFormData();
if (path) {
imgElement.setAttribute("src", getImageUrl());
}
}
};
pathInput.onchange = function() {
path = pathInput.value;
if (path) {
path = "file:///" + path;
}
if (path && currentIndex !== null) {
imgElement.setAttribute("src", getImageUrl());
} else {
imgElement.setAttribute("src", "");
}
};
flipUpsideDownInput.onchange = function() {
if (this.checked) {
imgElement.style.transform = "scaleY(-1)";
} else {
imgElement.style.transform = "";
}
};
restartButton.onclick = function() {
clearLog();
playbackStopped = false;
loadFormData();
currentIndex = parseInt(firstIndexInput.value);
changeFrame();
};
playPauseButton.onclick = playPause;
//pause/resume right click
viewerElement.oncontextmenu = function(e) {
e.preventDefault();
playPause();
};
//drag scroll
viewerElement.onmousemove = function(e) {
mouseDown && updateScrollPos(e);
};
viewerElement.onmousedown = function(e) {
e.preventDefault();
mouseDown = true;
clickX = e.pageX;
clickY = e.pageY;
};
viewerElement.onmouseup = function(e) {
mouseDown = false;
html.style.cursor = "auto";
};
//next previous frame with arrows
document.onkeyup = function(e) {
const activeElement = document.activeElement;
if (activeElement === null || activeElement.tagName !== "INPUT") {
const key = e.which;
switch (key) {
case 37: //left
currentIndex -= parseInt(indexLeapInput.value);
imgElement.setAttribute("src", getImageUrl());
currentIndexInput.value = currentIndex;
break;
case 39://right
currentIndex += parseInt(indexLeapInput.value);
imgElement.setAttribute("src", getImageUrl());
currentIndexInput.value = currentIndex;
break;
}
}
};
//init
loadFormData();
if (path && currentIndex !== null) {
imgElement.setAttribute("src", getImageUrl());
}
</script>
</body>
</html>