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feat: adds download and reset buttons #3

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feat: adds download and reset buttons #3

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31 changes: 31 additions & 0 deletions css/main.css
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,37 @@ body {
font-size: 16px;
}

button {
padding: 8px 16px;
font-size: 14px;
border: none;
border-radius: 4px;
cursor: pointer;
color: #fff;
background-color: #555;
transition: background-color 0.2s;
}

button:hover {
background-color: #333;
}

button#download {
background-color: #2b7a2b;
}

button#download:hover {
background-color: #216121;
}

button#reset {
background-color: #b33a3a;
}

button#reset:hover {
background-color: #902d2d;
}

p {
text-align: center;
}
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6 changes: 5 additions & 1 deletion index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@
<h1>Thumbnail Generator</h1>
<p>Generating YouTube video thumbnails for GitHub READMEs.</p>
<div class="element">
<img id="yt-thumb" style="display: none"></img>
<img crossOrigin="anonymous" id="yt-thumb" style="display: none"></img>
</div>
<div class="element">
<label for="yt-title">Title:</label>
Expand Down Expand Up @@ -44,6 +44,10 @@ <h1>Thumbnail Generator</h1>
<input id="yt-pad" type="range" step="1" min="0" max="960" value="35" />
<output id="yt-pad-display"></output>
</div>
<div class="element">
<button id="download">Download</button>
<button id="reset">Reset</button>
</div>
<div class="element">
<canvas id="yt-canvas" width="480" height="360"></canvas>
</div>
Expand Down
54 changes: 42 additions & 12 deletions js/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
function getElementByIdOrDie(elementId) {
var element = document.getElementById(elementId);
if (element === null) {
throw new Error("Could not find element with id '" + elementId + "'");
throw new Error("Could not find element with id '".concat(elementId, "'"));
}
return element;
}
Expand All @@ -17,7 +17,7 @@ function renderThumbnail(ctx, ytThumb, state) {
gradient.addColorStop(1.0, '#00000000');
ctx.fillStyle = gradient;
ctx.fillRect(0, 0, state.width, height);
ctx.font = state.fontSize + "px LibreBaskerville";
ctx.font = "".concat(state.fontSize, "px LibreBaskerville");
ctx.fillStyle = 'white';
ctx.fillText(state.title, state.pad, height - state.pad);
}
Expand All @@ -31,6 +31,26 @@ function updateUrl(state, defaultState) {
}
window.history.replaceState(null, "", "?" + new URLSearchParams(diff).toString());
}
function slugify(str) {
return str
.toLowerCase()
.trim()
.normalize("NFD")
.replace(/[\u0300-\u036f]/g, "")
.replace(/[^a-z0-9]+/g, "-")
.replace(/(^-|-$)/g, "");
}
function downloadThumbnail(title, canvas) {
canvas.toBlob(function (blob) {
if (!blob)
throw new Error("Could not convert the canvas to Blob");
var link = document.createElement("a");
link.href = URL.createObjectURL(blob);
link.download = slugify(title);
link.click();
URL.revokeObjectURL(link.href);
});
}
window.onload = function () {
var ytLink = getElementByIdOrDie("yt-link");
var ytError = getElementByIdOrDie("yt-error");
Expand All @@ -43,6 +63,8 @@ window.onload = function () {
var ytFontDisplay = getElementByIdOrDie("yt-font-display");
var ytPad = getElementByIdOrDie("yt-pad");
var ytPadDisplay = getElementByIdOrDie("yt-pad-display");
var downloadBtn = getElementByIdOrDie("download");
var resetBtn = getElementByIdOrDie("reset");
var ctx = ytCanvas.getContext('2d');
if (ctx === null)
throw new Error("Could not initialize 2d context");
Expand Down Expand Up @@ -70,18 +92,26 @@ window.onload = function () {
if (link)
ytLink.value = link;
ytWidthDisplay.value = ytWidth.value;
ytFontDisplay.value = ytFont.value + "px";
ytFontDisplay.value = "".concat(ytFont.value, "px");
ytPadDisplay.value = ytPad.value;
var state = {
title: ytTitle.value,
width: Number(ytWidth.value),
fontSize: Number(ytFont.value),
pad: Number(ytPad.value),
link: ytLink.value,
};
var state = Object.assign({}, defaultState);
var json = JSON.stringify(state);
console.log(json);
console.log(btoa(json));
downloadBtn.addEventListener("click", function () { return downloadThumbnail(ytTitle.value, ytCanvas); });
resetBtn.addEventListener("click", function () {
ytTitle.value = defaultState.title;
ytWidth.value = defaultState.width.toString();
ytFont.value = defaultState.fontSize.toString();
ytPad.value = defaultState.pad.toString();
ytLink.value = defaultState.link;
ytWidthDisplay.value = defaultState.width.toString();
ytFontDisplay.value = "".concat(defaultState.fontSize.toString(), "px");
ytPadDisplay.value = ytPad.value;
state = Object.assign({}, defaultState);
updateUrl(state, defaultState);
renderThumbnail(ctx, ytThumb, state);
});
ytWidth.onchange = function () { return updateUrl(state, defaultState); };
ytWidth.oninput = function () {
ytWidthDisplay.value = ytWidth.value;
Expand All @@ -90,7 +120,7 @@ window.onload = function () {
};
ytFont.onchange = function () { return updateUrl(state, defaultState); };
ytFont.oninput = function () {
ytFontDisplay.value = ytFont.value + "px";
ytFontDisplay.value = "".concat(ytFont.value, "px");
state.fontSize = Number(ytFont.value);
renderThumbnail(ctx, ytThumb, state);
};
Expand All @@ -116,7 +146,7 @@ window.onload = function () {
var ytHostRegexp = new RegExp('^(.+\.)?youtube\.com$');
if (ytHostRegexp.test(url.hostname)) {
var ytVideoId = url.searchParams.getAll('v').join('');
ytThumb.src = "http://i3.ytimg.com/vi/" + ytVideoId + "/maxresdefault.jpg";
ytThumb.src = "http://i3.ytimg.com/vi/".concat(ytVideoId, "/maxresdefault.jpg");
}
else {
throw new Error('Only YouTube Links are supported');
Expand Down
88 changes: 62 additions & 26 deletions ts/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ function renderThumbnail(ctx: CanvasRenderingContext2D, ytThumb: HTMLImageElemen
const aspect = ytThumb.height / ytThumb.width;
const height = aspect * state.width;

ctx.canvas.width = state.width;
ctx.canvas.width = state.width;
ctx.canvas.height = height;

ctx.drawImage(ytThumb, 0, 0, state.width, height);
Expand All @@ -46,18 +46,42 @@ function updateUrl(state: State, defaultState: State) {
window.history.replaceState(null, "", "?" + new URLSearchParams(diff).toString());
}

function slugify(str: string) {
return str
.toLowerCase()
.trim()
.normalize("NFD")
.replace(/[\u0300-\u036f]/g, "")
.replace(/[^a-z0-9]+/g, "-")
.replace(/(^-|-$)/g, "");
}

function downloadThumbnail(title: string, canvas: HTMLCanvasElement): void {
canvas.toBlob(blob => {
if (!blob) throw new Error("Could not convert the canvas to Blob");
const link = document.createElement("a");
link.href = URL.createObjectURL(blob);
link.download = slugify(title);
link.click();
URL.revokeObjectURL(link.href);
});
}


window.onload = () => {
const ytLink = getElementByIdOrDie("yt-link") as HTMLInputElement;
const ytError = getElementByIdOrDie("yt-error") as HTMLElement;
const ytThumb = getElementByIdOrDie("yt-thumb") as HTMLImageElement;
const ytCanvas = getElementByIdOrDie("yt-canvas") as HTMLCanvasElement;
const ytTitle = getElementByIdOrDie("yt-title") as HTMLInputElement;
const ytWidth = getElementByIdOrDie("yt-width") as HTMLInputElement;
const ytLink = getElementByIdOrDie("yt-link") as HTMLInputElement;
const ytError = getElementByIdOrDie("yt-error") as HTMLElement;
const ytThumb = getElementByIdOrDie("yt-thumb") as HTMLImageElement;
const ytCanvas = getElementByIdOrDie("yt-canvas") as HTMLCanvasElement;
const ytTitle = getElementByIdOrDie("yt-title") as HTMLInputElement;
const ytWidth = getElementByIdOrDie("yt-width") as HTMLInputElement;
const ytWidthDisplay = getElementByIdOrDie("yt-width-display") as HTMLOutputElement;
const ytFont = getElementByIdOrDie("yt-font") as HTMLInputElement;
const ytFontDisplay = getElementByIdOrDie("yt-font-display") as HTMLOutputElement;
const ytPad = getElementByIdOrDie("yt-pad") as HTMLInputElement;
const ytPadDisplay = getElementByIdOrDie("yt-pad-display") as HTMLOutputElement;
const ytFont = getElementByIdOrDie("yt-font") as HTMLInputElement;
const ytFontDisplay = getElementByIdOrDie("yt-font-display") as HTMLOutputElement;
const ytPad = getElementByIdOrDie("yt-pad") as HTMLInputElement;
const ytPadDisplay = getElementByIdOrDie("yt-pad-display") as HTMLOutputElement;
const downloadBtn = getElementByIdOrDie("download") as HTMLButtonElement;
const resetBtn = getElementByIdOrDie("reset") as HTMLButtonElement;

const ctx = ytCanvas.getContext('2d');
if (ctx === null) throw new Error(`Could not initialize 2d context`);
Expand All @@ -71,28 +95,40 @@ window.onload = () => {
};

const params = new URLSearchParams(window.location.search);
const title = params.get("title"); if (title) ytTitle.value = title;
const width = params.get("width"); if (width) ytWidth.value = width;
const fontSize = params.get("fontSize"); if (fontSize) ytFont.value = fontSize;
const pad = params.get("pad"); if (pad) ytPad.value = pad;
const link = params.get("link"); if (link) ytLink.value = link;
const title = params.get("title"); if (title) ytTitle.value = title;
const width = params.get("width"); if (width) ytWidth.value = width;
const fontSize = params.get("fontSize"); if (fontSize) ytFont.value = fontSize;
const pad = params.get("pad"); if (pad) ytPad.value = pad;
const link = params.get("link"); if (link) ytLink.value = link;

ytWidthDisplay.value = ytWidth.value;
ytFontDisplay.value = `${ytFont.value}px`;
ytPadDisplay.value = ytPad.value;
ytFontDisplay.value = `${ytFont.value}px`;
ytPadDisplay.value = ytPad.value;

const state = {
title: ytTitle.value,
width: Number(ytWidth.value),
fontSize: Number(ytFont.value),
pad: Number(ytPad.value),
link: ytLink.value,
};
let state = Object.assign({}, defaultState);

const json = JSON.stringify(state);
console.log(json)
console.log(btoa(json));

downloadBtn.addEventListener("click", () => downloadThumbnail(ytTitle.value, ytCanvas));

resetBtn.addEventListener("click", () => {
ytTitle.value = defaultState.title;
ytWidth.value = defaultState.width.toString();
ytFont.value = defaultState.fontSize.toString();
ytPad.value = defaultState.pad.toString();
ytLink.value = defaultState.link;

ytWidthDisplay.value = defaultState.width.toString();
ytFontDisplay.value = `${defaultState.fontSize.toString()}px`;
ytPadDisplay.value = ytPad.value;

state = Object.assign({}, defaultState)
updateUrl(state, defaultState);
renderThumbnail(ctx, ytThumb, state);
});

ytWidth.onchange = () => updateUrl(state, defaultState);
ytWidth.oninput = () => {
ytWidthDisplay.value = ytWidth.value;
Expand Down Expand Up @@ -131,7 +167,7 @@ window.onload = () => {
} else {
throw new Error('Only YouTube Links are supported');
}
} catch(e) {
} catch (e) {
ytError.innerText = (e as Error).message;
}
};
Expand Down