@antv/g2
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the Grammar of Graphics in Javascript
48 lines • 1.6 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.intersectionAreaPath = void 0;
const circleintersection_1 = require("./circleintersection");
/**
* 根据圆心(x, y) 半径 r 返回圆的绘制 path
* @param x 圆心点 x
* @param y 圆心点 y
* @param r 圆的半径
* @returns 圆的 path
*/
function circlePath(x, y, r) {
const ret = [];
// ret.push('\nM', x, y);
// ret.push('\nm', -r, 0);
// ret.push('\na', r, r, 0, 1, 0, r * 2, 0);
// ret.push('\na', r, r, 0, 1, 0, -r * 2, 0);
const x0 = x - r;
const y0 = y;
ret.push('M', x0, y0);
ret.push('A', r, r, 0, 1, 0, x0 + 2 * r, y0);
ret.push('A', r, r, 0, 1, 0, x0, y0);
return ret.join(' ');
}
/** returns a svg path of the intersection area of a bunch of circles */
function intersectionAreaPath(circles) {
const stats = {};
(0, circleintersection_1.intersectionArea)(circles, stats);
const arcs = stats.arcs;
if (arcs.length === 0) {
return 'M 0 0';
}
else if (arcs.length == 1) {
const circle = arcs[0].circle;
return circlePath(circle.x, circle.y, circle.radius);
}
else {
// draw path around arcs
const ret = ['\nM', arcs[0].p2.x, arcs[0].p2.y];
for (let i = 0; i < arcs.length; ++i) {
const arc = arcs[i], r = arc.circle.radius, wide = arc.width > r;
ret.push('\nA', r, r, 0, wide ? 1 : 0, 1, arc.p1.x, arc.p1.y);
}
return ret.join(' ');
}
}
exports.intersectionAreaPath = intersectionAreaPath;
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