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index.html
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<html>
<head>
<title>Signature Background Generator</title>
</head>
<body>
<div style="display: flex">
<div id="formContainer">
<form>
<fieldset>
<legend>Input fields</legend>
<p>
<label for="txbText">Text</label>
<input type="text" name="text" id="txbText" value="Hello world" />
</p>
<p>
<label for="txbGapX">Gap (X)</label>
<input type="text" name="gapX" id="txbGapX" value="64" />
</p>
<p>
<label for="txbGapY">Gap (Y)</label>
<input type="text" name="gapY" id="txbGapY" value="32" />
</p>
<p>
<label for="txbRotate">Rotate</label>
<input type="text" name="rotate" id="txbRotate" value="-20" />
</p>
<p>
<label for="txbColor">Color</label>
<input type="text" name="color" id="txbColor" value="#222" />
</p>
<p>
<label for="txbSize">Text Size</label>
<input type="text" name="size" id="txbSize" value="10" />
</p>
<p>
<input type="button" id="btnSubmit" value="Generate" onclick="draw()" />
</p>
</fieldset>
</form>
</div>
<div style="flex-grow: 1;">
<canvas id="canvas" style="width: 100%"></canvas>
</div>
</div>
<p>
You are licensed to use this project under MIT License.
<a href="https://github.com/bianyifan/sigback">GitHub Repo</a>
</p>
<script>
function draw() {
var text = document.getElementById("txbText").value,
gapX = parseInt(document.getElementById("txbGapX").value),
gapY = parseInt(document.getElementById("txbGapY").value),
rotate = parseInt(document.getElementById("txbRotate").value),
color = document.getElementById("txbColor").value,
size = document.getElementById("txbSize").value;
var canvas = document.getElementById("canvas"), ctx = canvas.getContext("2d");
canvas.width = screen.width - document.getElementById("formContainer").scrollWidth - 32;
canvas.height = screen.height / 2;
ctx.clearRect(0, 0, canvas.width, canvas.height);
for (var i = 0; i < canvas.width; i += gapX) {
for (var j = 0; j < canvas.height; j += gapY) {
ctx.save();
ctx.translate(i, j);
ctx.rotate(Math.PI * rotate / 180);
ctx.textAligh = "center";
ctx.fillStyle = color;
ctx.font = ctx.font.replace(/\d+px/, size+"px");
ctx.fillText(text, 0, 0);
ctx.restore();
}
}
}
</script>
</body>
</html>