@antv/path-util
Version:
A common util collection for antv projects
133 lines • 4.7 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/*
* 抽取pathSegment中的关键点
* M,L,A,Q,H,V一个端点
* Q, S抽取一个端点，一个控制点
* C抽取一个端点，两个控制点
*/
function _getSegmentPoints(segment) {
var points = [];
switch (segment[0]) {
case 'M':
points.push([segment[1], segment[2]]);
break;
case 'L':
points.push([segment[1], segment[2]]);
break;
case 'A':
points.push([segment[6], segment[7]]);
break;
case 'Q':
points.push([segment[3], segment[4]]);
points.push([segment[1], segment[2]]);
break;
case 'T':
points.push([segment[1], segment[2]]);
break;
case 'C':
points.push([segment[5], segment[6]]);
points.push([segment[1], segment[2]]);
points.push([segment[3], segment[4]]);
break;
case 'S':
points.push([segment[3], segment[4]]);
points.push([segment[1], segment[2]]);
break;
case 'H':
points.push([segment[1], segment[1]]);
break;
case 'V':
points.push([segment[1], segment[1]]);
break;
default:
}
return points;
}
// 将两个点均分成count个点
function _splitPoints(points, former, count) {
var result = [].concat(points);
var index;
var t = 1 / (count + 1);
var formerEnd = _getSegmentPoints(former)[0];
for (var i = 1; i <= count; i++) {
t *= i;
index = Math.floor(points.length * t);
if (index === 0) {
result.unshift([formerEnd[0] * t + points[index][0] * (1 - t), formerEnd[1] * t + points[index][1] * (1 - t)]);
}
else {
result.splice(index, 0, [formerEnd[0] * t + points[index][0] * (1 - t), formerEnd[1] * t + points[index][1] * (1 - t)]);
}
}
return result;
}
function formatPath(fromPath, toPath) {
if (fromPath.length <= 1) {
return fromPath;
}
var points;
for (var i = 0; i < toPath.length; i++) {
if (fromPath[i][0] !== toPath[i][0]) {
// 获取fromPath的pathSegment的端点，根据toPath的指令对其改造
points = _getSegmentPoints(fromPath[i]);
switch (toPath[i][0]) {
case 'M':
fromPath[i] = ['M'].concat(points[0]);
break;
case 'L':
fromPath[i] = ['L'].concat(points[0]);
break;
case 'A':
fromPath[i] = [].concat(toPath[i]);
fromPath[i][6] = points[0][0];
fromPath[i][7] = points[0][1];
break;
case 'Q':
if (points.length < 2) {
if (i > 0) {
points = _splitPoints(points, fromPath[i - 1], 1);
}
else {
fromPath[i] = toPath[i];
break;
}
}
fromPath[i] = ['Q'].concat(points.reduce(function (arr, i) { return arr.concat(i); }, []));
break;
case 'T':
fromPath[i] = ['T'].concat(points[0]);
break;
case 'C':
if (points.length < 3) {
if (i > 0) {
points = _splitPoints(points, fromPath[i - 1], 2);
}
else {
fromPath[i] = toPath[i];
break;
}
}
fromPath[i] = ['C'].concat(points.reduce(function (arr, i) { return arr.concat(i); }, []));
break;
case 'S':
if (points.length < 2) {
if (i > 0) {
points = _splitPoints(points, fromPath[i - 1], 1);
}
else {
fromPath[i] = toPath[i];
break;
}
}
fromPath[i] = ['S'].concat(points.reduce(function (arr, i) { return arr.concat(i); }, []));
break;
default:
fromPath[i] = toPath[i];
}
}
}
return fromPath;
}
exports.default = formatPath;
//# sourceMappingURL=format-path.js.map