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glyphText.js
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glyphText.js
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const canvasSketch = require('canvas-sketch');
const random = require('canvas-sketch-util/random');
const settings = {
dimensions: [ 1080, 1080 ]
};
let text = "A";
let fontsize = "1200";
let fontfamily = "Serif";
const typeCanvas = document.createElement("canvas");
const typeContext = typeCanvas.getContext("2d");
const sketch = ({ context, width, height }) => {
const cell ="20";
const cols = Math.floor(width/cell);
const rows = Math.floor(height/cell);
typeCanvas.width = cols;
typeCanvas.height = rows;
return ({ context, width, height }) => {
typeContext.fillStyle = "black";
typeContext.fillRect(0,0, cols, rows);
fontsize = cols * 1.2;
typeContext.font = `${fontsize}px ${fontfamily}`;
typeContext.fillStyle = "white";
typeContext.textBaseline = 'middle';
typeContext.textAlign = 'center';
typeContext.fillText(text, typeCanvas.width * 0.5, typeCanvas.height * 0.6);
context.fillStyle = 'black';
context.fillRect(0, 0, width, height);
const typeData = typeContext.getImageData(0,0,cols,rows).data;
for ( let i =0; i < cols * rows; i++ ) {
const col = i % cols;
const row = Math.floor(i / cols);
const x = col * cell;
const y = row * cell;
context.save();
const r = typeData[i*4+0];
const g = typeData[i*4+1];
const b = typeData[i*4+2];
const a = typeData[i*4+3];
context.translate(x,y);
if (r > 200) {
context.fillStyle = "grey";
}
else {
context.fillStyle = "white";
}
//context.fillRect(0, 0, cell, cell);
context.font = `${cell * 2}px ${fontfamily}`;
if (Math.random() < 0.1) context.font = `${cell * 6}px ${fontfamily}`;
context.textAlign = "center";
context.textBaseline = "middle";
context.fillText(getGlyph(r), 0, 0);
context.restore();
}
};
};
document.addEventListener("keyup", function(e) {
text = e.key.toUpperCase();
manager.render();
})
function getGlyph(v) {
if (v < 50) return " ";
if (v < 100) return ".";
if (v < 150) return "-";
if (v < 200) return "+";
return random.pick([".", "_", "/", text])
}
const start = async () => {
manager = await canvasSketch(sketch, settings);
};
start();