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diy.html
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diy.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Gif'r</title>
<link rel="icon" type="image/png" sizes="16x16" href="favicon.png">
<link rel="stylesheet" href="bulma.min.css">
<!-- <link href="https://fonts.googleapis.com/css2?family=Roboto&display=swap&family=Leckerli+One&family=Noto+Serif" rel="stylesheet"> -->
<style>
.hidden {
display: none !important;
}
.handle {
user-select: none;
}
.p-0 { padding: 0px; }
.pt-1 { padding-top: 0.5rem; }
.pt-2 { padding-top: 1rem; }
.pb-2 { padding-bottom: 1rem; }
.mb-2 { margin-bottom: 1rem; }
.mt-2 { margin-top: 1rem; }
.text-center { text-align: center; }
.square-edges, #playback-controls .button {
border-radius: 0;
}
.is-danger {
background-color: #f14668;
color: #fff;
}
#canvas-preview-section canvas {
margin-right: 0.25rem;
}
#main-canvas-container {
background-image: linear-gradient(45deg, #808080 25%, transparent 25%),
linear-gradient(135deg, #808080 25%, transparent 25%),
linear-gradient(45deg, transparent 75%, #808080 75%),
linear-gradient(135deg, transparent 75%, #808080 75%);
background-size:20px 20px;
background-position:0 0, 10px 0, 10px -10px, 0px 10px;
}
.dot {
height: 1rem;
width: 1rem;
background-color: black;
border-radius: 50%;
}
.dot.big {
height: 1.25rem;
width: 1.25rem;
}
.dot.bigger {
height: 1.5rem;
width: 1.5rem;
}
.current-preview {
border: 1px solid black !important;
}
.red-border {
border: 1px solid red;
}
</style>
<script src="fontawesome.5.15.1.all.min.js"></script>
<script src="gif.js"></script>
<!-- <script src="gif.worker.js"></script> -->
<script type="text/javascript">window.Worker && new Worker('gif.worker.js')</script>
<script type="text/javascript">
window.drawState = {};
function find(selector) {
return document.querySelector(selector);
}
function clearCanvas(canvas) {
const ctx = canvas.getContext("2d");
ctx.globalCompositeOperation = "destination-out";
ctx.fillRect(0, 0, canvas.width, canvas.height);
}
// currently only really useful for saving after clear frame button
// since data is updated on draw
function saveFrame(mainCanvas) {
const mainCanvasImageData = mainCanvas.getContext("2d").getImageData(0, 0, mainCanvas.width, mainCanvas.height);
const frameIdx = window.currentFrameIdx;
const canvas = getPreviewCanvasForIdx(frameIdx);
copyCanvasToPreview(mainCanvas, canvas);
window.frameData[frameIdx] = { imageData: mainCanvasImageData, delay: 1 };
}
function drawStrokeOntoCanvas(canvas, previousPosition, currentPosition, drawOptions = {}) {
if (!(canvas && previousPosition && currentPosition)) {
console.error("not enuff stough");
return;
}
const ctx = canvas.getContext("2d");
ctx.globalCompositeOperation = "source-over"; // layer on top
ctx.strokeStyle = drawOptions.penColour || 'orange';
ctx.lineWidth = 10;
ctx.beginPath();
ctx.moveTo(previousPosition.x, previousPosition.y);
ctx.lineTo(currentPosition.x, currentPosition.y);
ctx.stroke();
}
// Cool brushy effect
function initBrushyDrawHandlers(canvas) {
canvas.on = on;
canvas.on("touchstart", function(e) {
drawState.penDown = true;
drawState.previousPosition = getPositionForTouchMove(this, e);
console.log(e, drawState);
});
canvas.on("touchend", function(e) {
drawState.penDown = false;
drawState.previousPosition = null;
console.log(e, drawState);
});
canvas.on("touchmove", function(e) {
e.preventDefault();
if (!drawState.penDown) return;
const currentPosition = getPositionForTouchMove(this, e);
drawStrokeOntoCanvas(this, drawState.previousPosition, currentPosition, { penColour: drawState.penColour });
drawState.previousPosition = currentPosition;
console.log(drawState.previousPosition.x, drawState.previousPosition.y);
});
}
function initDrawHandlers(canvas) {
const mainCanvas = canvas;
let ctx = canvas.getContext("2d");
let previewCanvas
canvas.on = on;
canvas.on("touchstart", handleTouchStart);
canvas.on("mousedown", handleTouchStart);
canvas.on("touchmove", handleTouchMove);
window.document.addEventListener("mousemove", handleTouchMove);
canvas.on("touchend", handleTouchEnd)
window.document.addEventListener("mouseup", function(e) {
if (drawState.penDown) {
handleTouchEnd(e);
}
});
function getPositionForCursor(element, e) {
if (['mousedown','mousemove','mouseup'].includes(e.type)) {
const box = mainCanvas.getBoundingClientRect();
return {
x: e.x - box.left,
y: e.y - box.top
};
}
}
function handleTouchStart(e) {
previewCanvas = getPreviewForCurrentActiveFrame();
drawState.penDown = true;
const currentPosition = getPositionForCursor(this, e) || getPositionForTouchMove(this, e);
drawState.previousPosition = currentPosition;
ctx.globalCompositeOperation = "source-over";
if (brushStyle.eraser) {
ctx.globalCompositeOperation = "destination-out";
}
ctx.strokeStyle = drawState.penColour || "orange";
ctx.fillStyle = drawState.penColour || "orange"; // for the starting and ending dots
ctx.lineWidth = brushStyle.lineWidth || 15;
ctx.lineJoin = "round";
ctx.beginPath();
ctx.arc(currentPosition.x, currentPosition.y, ctx.lineWidth / 2, 0, 2 * Math.PI);
ctx.fill();
ctx.beginPath();
ctx.moveTo(currentPosition.x, currentPosition.y);
copyCanvasToPreview(mainCanvas, previewCanvas);
saveCanvasData(mainCanvas, window.currentFrameIdx);
};
function handleTouchEnd(e) {
ctx.beginPath();
ctx.arc(drawState.previousPosition.x, drawState.previousPosition.y, ctx.lineWidth / 2, 0, 2 * Math.PI);
ctx.fill();
drawState.penDown = false;
drawState.previousPosition = null;
copyCanvasToPreview(mainCanvas, previewCanvas);
saveCanvasData(mainCanvas, window.currentFrameIdx);
};
function handleTouchMove(e) {
if (!drawState.penDown) return;
e.preventDefault(); // this stops the canvas/page from being moved around
const currentPosition = getPositionForCursor(this, e) || getPositionForTouchMove(this, e);
drawState.previousPosition = currentPosition;
ctx.lineTo(currentPosition.x, currentPosition.y);
ctx.stroke();
copyCanvasToPreview(mainCanvas, previewCanvas);
saveCanvasData(mainCanvas, window.currentFrameIdx);
};
}
function on(eventName, handler) {
this.addEventListener(eventName, handler);
}
function setPenColour(colour) {
drawState.penColour = colour;
find("#brush-colour-preview").style.color = colour;
if (brushStyle.eraser) selectBrush("normal");
}
function initScratchCanvas(mainCanvas) {
const canvas = document.createElement("canvas");
canvas.width = mainCanvas.width, canvas.height = mainCanvas.height;
return canvas;
}
function createPreviewCanvas() {
const canvas = document.createElement("canvas");
const ctx = canvas.getContext("2d");
canvas.classList.add("red-border");
canvas.classList.add("current-preview");
canvas.width = 50, canvas.height = 50;
return canvas;
}
function copyCanvasToPreview(mainCanvas, previewCanvas) {
const mainCanvasImageData = mainCanvas.getContext("2d").getImageData(0, 0, mainCanvas.width, mainCanvas.height);
const previewCtx = previewCanvas.getContext("2d");
previewCtx.globalCompositeOperation = "source-over";
previewCtx.fillStyle = "white";
previewCtx.fillRect(0, 0, previewCanvas.width, previewCanvas.height);
previewCtx.scale(previewCanvas.width / mainCanvas.width, previewCanvas.height / mainCanvas.height);
previewCtx.drawImage(mainCanvas, 0, 0);
previewCtx.setTransform(1, 0, 0, 1, 0, 0);
}
function getPreviewCanvasForIdx(frameIdx) {
return document.querySelectorAll("#canvas-preview-section canvas")[frameIdx];
}
function addFrame() {
const mainCanvas = getMainCanvas();
console.log("addFrame");
window.frameData.frameCount++;
window.currentFrameIdx = window.frameData.frameCount;
clearCanvas(mainCanvas);
initPreview();
// Essentially copy current frame into the newest frame...
saveCanvasData(mainCanvas, window.currentFrameIdx);
selectFrameIdx(window.currentFrameIdx);
getPreviewCanvasForIdx(window.currentFrameIdx).scrollIntoView({ behavior: "smooth", block: "nearest" });
}
function addPreviewToPreviewSection(canvas) {
find("#canvas-preview-section").appendChild(canvas);
}
function getPreviewForCurrentActiveFrame() {
return document.querySelectorAll("#canvas-preview-section canvas")[window.currentFrameIdx];
}
function selectFrameIdx(idx) {
console.log(`selectFrameIdx from ${window.currentFrameIdx} to ${idx}`);
window.currentFrameIdx = idx;
refreshCanvas();
Array.prototype.forEach.call(document.querySelectorAll(".current-preview"), el => el.classList.remove("current-preview"));
getPreviewCanvasForIdx(idx).classList.add("current-preview");
}
function getImageData(frameIdx) {
if (frameIdx < 0) frameIdx = window.frameData.frameCount - 1;
else if (frameIdx > window.frameData.frameCount) frameIdx = 0;
return (window.frameData[frameIdx] || {}).imageData;
}
function swapPreviewLeft(previewCanvas, previewContainer) {
const allPreviews = document.querySelectorAll("#canvas-preview-section canvas");
for (var i = 0; i < allPreviews.length; i++) {
if (allPreviews[i] === previewCanvas) break;
}
if (i === 0) return console.log("nothing to your left...")
previewContainer.insertBefore(previewCanvas, allPreviews[i - 1]);
let temp = window.frameData[i];
window.frameData[i] = window.frameData[i - 1];
window.frameData[i - 1] = temp;
}
function swapPreviewRight(previewCanvas, previewContainer) {
const allPreviews = document.querySelectorAll("#canvas-preview-section canvas");
for (var i = 0; i < (allPreviews.length - 1); i++) {
if (allPreviews[i] === previewCanvas) break;
}
if (i === allPreviews.length - 1) return console.log("nothing to your right...");
previewContainer.insertBefore(allPreviews[i + 1], previewCanvas);
let temp = window.frameData[i];
window.frameData[i] = window.frameData[i + 1];
window.frameData[i + 1] = temp;
}
function updateCurrentFrameIdxAfterSwap() {
const allPreviews = document.querySelectorAll("#canvas-preview-section canvas");
for(let i = 0; i < allPreviews.length; i++) {
if (allPreviews[i].classList.contains("current-preview")) {
console.log("preview frame is currently", i);
window.currentFrameIdx = i;
return;
}
}
}
function initPreview() {
const mainCanvas = getMainCanvas();
const preview = createPreviewCanvas();
const frameIdx = window.currentFrameIdx;
preview.setAttribute("originalIdx", frameIdx);
const previewContainer = find("#canvas-preview-section");
preview.addEventListener("click", e => selectFrameIdx(frameIdx));
preview.on("dragstart", e => console.log("dragstart", e));
preview.on("touchmove", e => {
const position = getPositionForTouchMove(preview, e);
if (position.x < preview.width * -0.4) {
console.log(frameIdx, "swap with left");
swapPreviewLeft(preview, previewContainer);
updateCurrentFrameIdxAfterSwap();
}
else if (position.x > preview.width * 1.4) {
console.log(frameIdx, "swap with right");
swapPreviewRight(preview, previewContainer);
updateCurrentFrameIdxAfterSwap();
}
});
copyCanvasToPreview(mainCanvas, preview);
addPreviewToPreviewSection(preview);
// assert that the preview idx is correct!
if (preview !== getPreviewForCurrentActiveFrame()) {
console.error("something is messed up with the preview idx", preview);
}
}
function saveCanvasData(mainCanvas, frameIdx) {
// and init the frameData object
window.frameData[frameIdx] = {
imageData: mainCanvas.getContext("2d").getImageData(0, 0, mainCanvas.width, mainCanvas.height),
delay: 1
};
}
function refreshCanvas() {
console.log("refreshCanvas");
const mainCanvas = getMainCanvas();
const canvasData = window.frameData[window.currentFrameIdx].imageData;
mainCanvas.getContext("2d").putImageData(canvasData, 0, 0);
}
function generateGif() {
const gif = new GIF({
workers: 2,
quality: 10
});
for (let i = 0; i < window.frameData.frameCount + 1; i++) {
if (!window.frameData[i]) continue;
const currentFrame = window.frameData[i];
console.log("currentFrame", currentFrame);
gif.addFrame(currentFrame.imageData, { copy: true, delay: currentFrame.delay * 10 });
}
gif.on('finished', function(blob) {
const url = URL.createObjectURL(blob);
console.log("gif ready:", url);
window.lastRender = blob;
const renderedImg = find("#output-gif");
renderedImg.src = url;
renderedImg.crossOrigin = "Anonymous";
makeVisible(find("#render-section"));
setTimeout(() => renderedImg.scrollIntoView({ behavior: "smooth" }), 500);
});
console.log("rendering...");
gif.render();
}
function getPositionForTouchMove(canvas, event) {
const touchEvent = event.targetTouches[0];
const box = canvas.getBoundingClientRect();
return {
x: touchEvent.clientX - box.left,
y: touchEvent.clientY - box.top
};
}
function makeVisible(element) {
element.classList.remove("hidden");
}
function makeInvisible(element) {
element.classList.add("hidden");
}
function getSizeField() {
return find("#canvas-height");
}
function updateCanvasHeight() {
getMainCanvas().height = getSizeField().value;
}
function onionStart(event) {
event.preventDefault();
console.log("onionStart");
window.onionModeOn = true;
const onionNext = find("#onion-next");
const onionPrevious = find("#onion-prev");
const nextImagedata = getImageData(window.currentFrameIdx + 1);
nextImagedata && onionNext.getContext("2d").putImageData(nextImagedata, 0, 0);
const prevImagedata = getImageData(window.currentFrameIdx - 1);
prevImagedata && onionPrevious.getContext("2d").putImageData(prevImagedata, 0, 0);
makeVisible(onionNext);
makeVisible(onionPrevious);
}
function onionEnd(event) {
event.preventDefault();
console.log("onionEnd");
window.onionModeOn = false;
makeInvisible(find("#onion-next"));
makeInvisible(find("#onion-prev"));
}
function selectBrush(size) {
const brushStyle = window.brushStyleOptions[size];
find("#brush-size-value").innerHTML = brushStyle.lineWidth || (brushStyle.eraser ? "Eraser" : "");
window.brushStyle = brushStyle;
}
function handleResetAll() {
window.confirm("Are you sure you want to discard everything?") && resetAll();
}
function initFrameData() {
window.currentFrameIdx = 0;
window.frameData = { frameCount: 0 };
}
function resetAll() {
initFrameData();
clearCanvas(getMainCanvas());
saveFrame(getMainCanvas());
find("#canvas-preview-section").innerHTML = "";
initPreview();
makeInvisible(find("#render-section"));
window.scrollTo(0, 0);
}
function getMainCanvas() {
return find("#main-canvas");
}
function loadImageToFrame(file) {
console.log(file);
const img = new Image();
img.src = URL.createObjectURL(file);
img.onload = () => drawImageOntoCanvas(img);
}
function drawImageOntoCanvas(image) {
const canvas = getMainCanvas();
const ctx = canvas.getContext("2d");
ctx.globalCompositeOperation = "source-over";
const sWidth = image.width, sHeight = image.height;
const cWidth = canvas.width, cHeight = canvas.height;
window.canvas = canvas;
window.image = image;
// The smaller the ratio, the smaller the image will become
const ratio = Math.min(cWidth / sWidth, cHeight / sHeight)
const xStart = (cWidth - sWidth * ratio) / 2;
const yStart = (cHeight - sHeight * ratio) / 2;
ctx.scale(ratio, ratio);
ctx.drawImage(image, xStart / ratio, yStart / ratio);
ctx.setTransform(1, 0, 0, 1, 0, 0);
}
function revealDrawControls() {
makeVisible(find("#brush-sizes-control"));
makeVisible(find("#frame-mgmt-control"));
makeVisible(find("#colour-palette"));
makeVisible(find("#render-controls"));
}
function readyToDraw() {
hideCanvasInitControls();
revealDrawControls();
initPreview();
const canvasContainer = find("#main-canvas-container");
const mainCanvas = getMainCanvas();
canvasContainer.style.height = mainCanvas.height + "px";
canvasContainer.style.width = mainCanvas.width + "px";
mainCanvas.style.position = "absolute";
addOnionLayerCanvas();
saveCanvasData(mainCanvas, window.currentFrameIdx);
}
function addOnionLayerCanvas() {
const mainCanvas = getMainCanvas();
const canvasContainer = find("#main-canvas-container");
const onionNext = initScratchCanvas(mainCanvas);
const onionPrevious = initScratchCanvas(mainCanvas);
onionNext.id = "onion-next";
onionPrevious.id = "onion-prev";
onionNext.style.position = "absolute";
onionPrevious.style.position = "absolute";
onionNext.style.opacity = 0.5;
onionPrevious.style.opacity = 0.5;
makeInvisible(onionNext);
makeInvisible(onionPrevious);
canvasContainer.appendChild(onionNext);
canvasContainer.appendChild(onionPrevious);
}
function hideCanvasInitControls() {
makeInvisible(find("#canvas-init-control"));
makeInvisible(find("#page-header"));
}
function downloadFrame() {
find("#dummy-download-link").href = getMainCanvas().toDataURL("image/png");
find("#dummy-download-link").click();
}
document.addEventListener("DOMContentLoaded", () => {
console.log("App Loaded");
initFrameData();
window.penColour = "orange";
window.brushStyleOptions = {
small: { lineWidth: 8 },
normal: { lineWidth: 15 },
big: { lineWidth: 25 },
eraser: { eraser: true }
}
selectBrush("normal")
const containerWidth = find("#main-canvas-container").clientWidth;
const canvas = getMainCanvas();
canvas.height = containerWidth, canvas.width = containerWidth;
clearCanvas(canvas);
initDrawHandlers(canvas);
getSizeField().value = containerWidth;
const colours = ["black", "grey", "white", "red", "orange", "yellow", "green", "deepskyblue", "blue", "purple", "pink", "saddlebrown"];
find("#colour-palette").innerHTML = colours.map(c =>
`<button class="button square-edges" id="colour-${c}" onclick="setPenColour('${c}')" style="background-color: ${c}; border: none;"> </button>`
).join("");
setPenColour("orange");
find("#add-frame").addEventListener("click", e => addFrame());
find("#clear-frame").addEventListener("click", e => { clearCanvas(canvas); saveFrame(canvas); });
find("#generate-gif").addEventListener("click", e => generateGif());
find("#upload-image-input").addEventListener("change", e => loadImageToFrame(e.currentTarget.files[0]));
getSizeField().addEventListener("change", () => setTimeout(updateCanvasHeight()));
getSizeField().addEventListener("keyup", () => setTimeout(updateCanvasHeight()));
find("#canvas-ok").addEventListener("click", readyToDraw);
// readyToDraw();
find("#add-onion-overlay").addEventListener("touchstart", (e) => onionStart(e));
// find("#add-onion-overlay").addEventListener("touchmove", () => console.log("touchmove"));
find("#add-onion-overlay").addEventListener("touchend", (e) => onionEnd(e));
});
// window.looper = setInterval(() => console.log("previews:", Array.from(
// document.querySelectorAll("#canvas-preview-section canvas")).map(el => el.getAttribute("originalIdx"))), 1000);
Element.prototype.on = on;
</script>
</head>
<body>
<section class="hero">
<div class="hero-body pt-1">
<!-- <div class="section">
<div> -->
<div class="container">
<h1 class="title" id="page-header" onclick="makeInvisible(this)">Draw something!</h1>
<div class="field has-addons" id="canvas-init-control">
<div class="control is-expanded">
<input id="canvas-height" class="input is-expanded" placeholder="height in pixels" value="" />
</div>
<div class="control">
<button class="button is-primary" type="button" id="canvas-ok">Size Okay!</button>
</div>
</div>
<div id="main-canvas-container">
<canvas id="main-canvas" width="100%" height="100%">
</div>
<div id="canvas-preview-section" class="mt-2" style="overflow-x: auto; display: flex; min-height: 50px;"></div>
<div class="buttons has-addons mt-2 hidden" id="colour-palette" style="justify-content: center;">
</div>
<div class="buttons has-addons is-centered mt-2 hidden" id="brush-sizes-control">
<span>
<button class="button is-white square-edges">
<!-- <span style="border: none; padding-right: 1rem;"><i class="fas fa-square fa-lg"></i></span> -->
<i id="brush-colour-preview" class="fas fa-paint-brush-alt"></i>
<span id="brush-size-value"></span>
</button>
</span>
<button class="button is-light" type="button" onclick="selectBrush('small')"><span class="dot small"></span></button>
<button class="button is-light" type="button" onclick="selectBrush('normal')"><span class="dot big"></span></button>
<button class="button is-light" type="button" onclick="selectBrush('big')"><span class="dot bigger"></span></button>
<button class="button is-dark" type="button" onclick="selectBrush('eraser')"><i class="fas fa-eraser"></i></button>
</div>
<div class="buttons has-addons is-centered hidden" id="frame-mgmt-control">
<button class="button is-danger" id="clear-frame"><i class="fas fa-trash"></i></button>
<button class="button is-info" id="upload-image" onclick="find('#upload-image-input').click()">
<i class="fas fa-folder"></i>
</button>
<input class="hidden" type="file" id="upload-image-input">
<button class="button is-primary" id="add-frame">
<i class="fas fa-plus"></i>
</button>
<button class="button is-dark" id="add-onion-overlay">Onion</button>
<button class="button is-light" id="download-frame" onclick="downloadFrame()">
<i class="fas fa-download"></i>
</button>
<a href="#" class="hidden" id="dummy-download-link" download="image.png"></a>
</div>
<!-- <button class="button is-success is-fullwidth" id="export-png">Save PNG</button> -->
<div class="buttons hidden" id="render-controls">
<button class="button is-success is-fullwidth" id="generate-gif">Render Gif</button>
<button class="button is-danger is-fullwidth" onclick="handleResetAll()">
<span>Reset All</span>
<!-- <span class="icon">
<i class="fas fa-exclamation"></i>
</span> -->
</button>
</div>
</div>
</div>
</section>
<section class="section hidden" id="render-section">
<div class="container">
<h1 class="title">You GIF is ready!</h1>
<h2 class="subtitle">
You have to <strong>Save the Image</strong>, you won't be able to hot link it.
</h2>
<div>
<img id="output-gif">
</div>
</div>
</section>
</body>