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import Viz from './viz.es';
const toNumber = (i) => Number(i);
const gv = new Viz({ workerURL: 'lib/lite.render.js' });
export default class Layout {
constructor() {
this.src = 'digraph { node [shape="rectangle"];\n';
}
addNode(graph, node) {
if (node.dom.className === 'hidden')
return;
const id = node.data.id;
this.src += ` "${id}" [fixedsize=true; width=${node.dom.offsetWidth / 72}; height=${node.dom.offsetHeight / 72}];\n`;
for (const reply of node.data.replies) {
if (node.collapsed && graph[reply.id].collapsed)
continue;
this.src += ` "${id}" -> "${reply.id}";\n`;
}
}
async render(canvas, setPosition, setSize) {
this.src += '}';
const info = await gv.renderJSONObject(this.src, { format: 'json0' });
const [_x, _y, width, height] = info.bb.split(',').map(toNumber);
setSize(width, height);
for (const object of info.objects) {
const [x, y] = object.pos.split(',').map(toNumber);
setPosition(object.name, x, height - y);
}
const ctx = canvas.getContext('2d');
ctx.lineWidth = 4;
ctx.lineCap = 'round';
ctx.lineJoin = 'round';
ctx.strokeStyle = '#696969';
ctx.fillStyle = '#696969';
for (const edge of info.edges) {
const pos = edge.pos.slice(2);
const points = pos.split(' ').map(p => {
const [x, y] = p.split(',');
return [toNumber(x), height - toNumber(y)];
});
ctx.beginPath();
ctx.moveTo(...points[1]);
for (let i = 4; i < points.length; i += 3) {
const [ax, ay] = points[i - 2];
const [bx, by] = points[i - 1];
const [x, y] = points[i];
ctx.bezierCurveTo(ax, ay, bx, by, x, y);
}
ctx.stroke();
const [lx, ly] = points[points.length - 1];
const [tx, ty] = points[0];
const [dx, dy] = [tx - lx, ty - ly];
const [hx, hy] = [dy*0.7, dx*-0.7];
ctx.beginPath();
ctx.moveTo(lx + dx*0.8, ly + dy*0.8);
ctx.lineTo(lx - dx*0.5 + hx, ly - dy*0.5 + hy);
ctx.lineTo(lx - dx*0.5 - hx, ly - dy*0.5 - hy);
ctx.fill();
}
}
}
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