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Canvas axis
{
const height = 60;
const context = DOM.context2d(width, height);
const drawAxis = await svg2canvas(context, svg =>
d3
.select(svg)
.append("g")
.attr("transform", "translate(0,36)")
.call(axis)
);
function draw(t) {
context.clearRect(0, 0, width, height);
// draw the background
context.globalAlpha = 0.4;
for (let i = 0; i < width; i += 3) {
context.fillStyle = d3.interpolateRainbow(i / width);
context.fillRect(i, 0, 3, height);
}
// draw the axis
drawAxis();
// draw the foreground
context.globalAlpha = 1;
context.strokeStyle = "white";
context.lineWidth = 3;
context.beginPath();
context.arc(x(t), 30, 25, 0, 2 * Math.PI);
context.stroke();
}
const ease1 = d3.easeBounceInOut,
ease2 = d3.easeCubic;
for (let t = 0; t < 1; t += .003) {
draw(.1 + ease1(t) - .4 * ease2(t));
yield context.canvas;
}
return context.canvas;
}
function svg2canvas(
ctx,
svgcallback,
ctxcallback = ctx => (ctx.globalAlpha = 1)
) {
const width = ctx.canvas.style.width
? parseFloat(ctx.canvas.style.width)
: ctx.canvas.width;
const height = width * (ctx.canvas.height / ctx.canvas.width);
return new Promise(async resolve => {
const s = document.createElementNS("http://www.w3.org/2000/svg", "svg");
s.setAttribute("viewBox", [0, 0, width, height]);
s.setAttribute("xmlns", "http://www.w3.org/2000/svg");
await svgcallback(s);
const i = new Image();
i.width = width;
i.height = height;
i.src = "data:image/svg+xml;utf8," + s.outerHTML;
const draw = () => {
ctx.save();
ctxcallback(ctx);
ctx.drawImage(i, 0, 0, i.width, i.height);
ctx.restore();
resolve(draw);
};
i.onload = draw;
});
}
x = d3.scaleLinear().range([20, width - 20])
axis = d3.axisTop(x)
d3 = require("d3@6")
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