Computer Graphics & Visualization @ufrj.br
{
await visibility();
const [w, h] = [width, Math.trunc((width * 9) / 16)];
let ctx = DOM.context2d(w, h);
if (background == "white") ctx.fillStyle = "black";
else ctx.fillStyle = "white";
for (let i = 0; i < sampleCount; i++) {
let [x, y] = [Math.random() * w, Math.random() * h];
ctx.beginPath();
const radius = dotSize * (1 + Math.random() * dotSizeVariation);
ctx.arc(x, y, radius, 0, 2 * Math.PI);
ctx.fill();
}
const img = ctx.canvas;
const rotAmount = (viewof rotationDegree.value * Math.PI) / 180;
const scaleAmount = viewof scaleFactor.value;
const animSpeed = viewof animationSpeed.value / 100;
let ctx2 = DOM.context2d(w, h);
ctx2.canvas.style.background = background;
yield ctx2.canvas;
let frameCount = 0;
function draw(x, y) {
if (!blur) ctx2.clearRect(0, 0, w, h);
ctx2.drawImage(img, 0, 0);
if (blur) {
if (background == "white") ctx2.fillStyle = `rgba(255,255,255,0.2)`;
else ctx2.fillStyle = `rgba(0,0,0,0.2)`;
ctx2.fillRect(0, 0, w, h);
}
ctx2.save();
ctx2.translate(x, y);
const rotAmount = (viewof rotationDegree.value * Math.PI) / 180;
const scaleAmount = viewof scaleFactor.value;
const animSpeed = viewof animationSpeed.value / 1000;
const s = (Math.cos(frameCount * animSpeed) + 1) * scaleAmount + 1;
ctx2.scale(s, s);
ctx2.rotate(Math.sin(++frameCount * animSpeed) * rotAmount);
ctx2.translate(-x, -y);
ctx2.drawImage(img, 0, 0);
ctx2.restore();
}
let [x, y] = [0, 0];
ctx2.canvas.onmousemove = (e) => {
[x, y] = [e.offsetX, e.offsetY];
};
for (;;) {
await visibility();
draw(x, y);
yield ctx2.canvas;
}
}
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