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Merge branch 'mvt' of gitlab.alipay-inc.com:datavis/L7_beta into mvt

This commit is contained in:
thinkinggis 2019-06-18 20:10:30 +08:00
parent b1f5c3272a badca0446d
commit 5dd2dcc2af
1 changed files with 22 additions and 1 deletions
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23
src/util/polyline-normals.js
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@ -88,7 +88,28 @@ export default function(points, closed, indexOffset) {
// get orientation
let flip = (dot(tangent, _normal) < 0) ? -1 : 1;
const bevel = miterLen > miterLimit;
const bevel = Math.abs(miterLen) > miterLimit;
// 处理前后两条线段重合的情况，这种情况不需要使用任何接头（miter/bevel）。
// 理论上这种情况下 miterLen = Infinity，本应通过 isFinite(miterLen) 判断，
// 但是 AMap 投影变换后丢失精度，只能通过一个阈值（1000）判断。
if (Math.abs(miterLen) > 1000) {
normal(_normal, lineA);
extrusions(attrPos, out, cur, _normal, 1);
attrDistance.push(d, d);
attrIndex.push(
_lastFlip === 1 ? [ index + 1, index + 3, index + 2 ]
: [ index, index + 2, index + 3 ]
);
// 避免在 Material 中使用 THREE.DoubleSide
attrIndex.push([ index + 2, index + 3, index + 4 ]);
count += 2;
_lastFlip = -1;
continue;
}
if (bevel) {
miterLen = miterLimit;