The avatar for @larsvers
lars
Published
Edited
Oct 5, 2019
1 fork
8 stars
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visual = {
const canvas = DOM.canvas(w, h);
const context = canvas.getContext('2d');

d3.select(canvas).call(zoom);

context.beginPath();
context.arc(w/2, h/2, h/4, 0, 2 * Math.PI);
context.stroke();
return canvas;
}
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function zoom(sel) {
const context = sel.node().getContext('2d');
const zoomBehaviour = d3.zoom().on('zoom', zoomed);
sel.call(zoomBehaviour);

function zoomed() {
const t = d3.event.transform;

context.save();

context.clearRect(0, 0, w, h);

context.translate(t.x, t.y);
context.scale(t.k, t.k);

context.beginPath(); // Comment this out for art's sake.
context.arc(w / 2, h / 2, h / 4, 0, 2 * Math.PI);
context.stroke();

context.restore();
}
}
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