playing with rasterizing font using techniques linked below.
The idea of drawing text on a <canvas> element and using the bitmap to
identify points within the text came from Toph Tucker’s block that
reverse-engineers FizzyText.
forked from armollica‘s block: Slimy Text
forked from enjalot‘s block: Particle viSFest
<html>
<head>
<style>
body { background: #111 }
</style>
</head>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script>
<script>
var text = "enj";
var width = 960;
var height = 500;
var fontSize = 420
var radius = 4;
var spacing = 18;
var collisionStrength = 0.1;
var options = {
width: width,
height: height,
spacing: spacing,
fontSize: fontSize + "px"
};
var color = d3.scaleSequential(d3.interpolateRainbow)
.domain([0, width])
// Rasterized grid of points that represent the text
var pixels = rasterizeText(text, options)
.map(function(d) {
var x = Math.random() * width;
var r = radius + Math.abs(width/2 - x)/width*2 * 4
return {
x: x,
y: Math.random() * height,
xTarget: d[0],
yTarget: d[1] - 40,
rTarget: r,
rDisplay: r * 2.
};
});
var maxR = d3.max(pixels, function(d) { return d.rTarget })
// Combine mouse node with pixel nodes
var nodes = [].concat(pixels);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
// Circles that form the text
var circle = svg.append("g")
.attr("class", "circles")
//.style("filter", "url(#gooey)")
.selectAll("circle").data(pixels)
.enter()
.append("rect")
.attr("x", function(d) { return d.x + maxR/2 - d.rDisplay/2; })
.attr("y", function(d) { return d.y + maxR/2 - d.rDisplay/2; })
.attr("width", function(d) { return d.rDisplay ; })
.attr("height", function(d) { return d.rDisplay ; })
.style("fill", function(d) {
if(d.rTarget < maxR/1.3)
return "#fff"
})
.style("stroke", function(d) {
return "#fff"
})
.style("stroke-width", function(d) {
return 1 + (maxR - d.rTarget) * .2
})
// Nodes want to form the text but won't overlap
var simulation = d3.forceSimulation(nodes)
.velocityDecay(0.2)
.force("x", d3.forceX(function(d) { return d.xTarget; }).strength(collisionStrength))
.force("y", d3.forceY(function(d) { return d.yTarget; }).strength(collisionStrength))
.force("collide", d3.forceCollide().radius(function(d) { return d.rTarget; }))
.on("tick", ticked);
function ticked() {
circle
//.attr("cx", function(d) { return d.x; })
//.attr("cy", function(d) { return d.y; })
.attr("x", function(d) { return d.x + maxR/2 - d.rDisplay/2; })
.attr("y", function(d) { return d.y + maxR/2 - d.rDisplay/2; })
}
// Convert text into grid of points that lay on top of the text
// Inspired by FizzyText. See //bl.ocks.org/tophtucker/978513bc74d0b32d3795
function rasterizeText(text, options) {
var o = options || {};
var fontSize = o.fontSize || "200px",
fontWeight = o.fontWeight || "600",
fontFamily = o.fontFamily || "sans-serif",
textAlign = o.center || "center",
textBaseline = o.textBaseline || "middle",
spacing = o.spacing || 10,
width = o.width || 960,
height = o.height || 500,
x = o.x || (width / 2),
y = o.y || (height / 2);
var canvas = document.createElement("canvas");
canvas.width = width;
canvas.height = height;
var context = canvas.getContext("2d");
context.font = [fontWeight, fontSize, fontFamily].join(" ");
context.textAlign = textAlign;
context.textBaseline = textBaseline;
var dx = context.measureText(text).width,
dy = +fontSize.replace("px", ""),
bBox = [[x - dx / 2, y - dy / 2], [x + dx / 2, y + dy / 2]];
context.fillText(text, x, y);
var imageData = context.getImageData(0, 0, width, height);
var pixels = [];
for (var x = bBox[0][0]; x < bBox[1][0]; x += spacing) {
for (var y = bBox[0][1]; y < bBox[1][1]; y += spacing) {
var pixel = getPixel(imageData, x, y);
if (pixel[3] != 0) pixels.push([x, y]);
}
}
return pixels;
}
function getPixel(imageData, x, y) {
var i = 4 * (parseInt(x) + parseInt(y) * imageData.width);
var d = imageData.data;
return [ d[i], d[i+1], d[i+2], d[i+3] ];
}
</script>
</body>
</html>