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118 lines
3.8 KiB
118 lines
3.8 KiB
import { __read } from "tslib";
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import { add, sub, min as _min, max as _max, scale, distance } from './matrix';
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function smoothBezier(points, smooth, isLoop, constraint) {
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var _a;
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var cps = [];
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var hasConstraint = !!constraint;
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var prevPoint;
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var nextPoint;
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var min = [Infinity, Infinity];
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var max = [-Infinity, -Infinity];
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var nextCp0;
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var cp1;
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var cp0;
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if (hasConstraint) {
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_a = __read(constraint, 2), min = _a[0], max = _a[1];
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for (var i = 0, l = points.length; i < l; i += 1) {
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var point = points[i];
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min = _min(min, point);
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max = _max(max, point);
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}
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}
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for (var i = 0, len = points.length; i < len; i += 1) {
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var point = points[i];
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if (i === 0 && !isLoop) {
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cp0 = point;
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}
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else if (i === len - 1 && !isLoop) {
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cp1 = point;
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cps.push(cp0);
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cps.push(cp1);
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}
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else {
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var prevIdx = [i ? i - 1 : len - 1, i - 1][isLoop ? 0 : 1];
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prevPoint = points[prevIdx];
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nextPoint = points[isLoop ? (i + 1) % len : i + 1];
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var v = [0, 0];
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v = sub(nextPoint, prevPoint);
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v = scale(v, smooth);
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var d0 = distance(point, prevPoint);
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var d1 = distance(point, nextPoint);
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var sum = d0 + d1;
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if (sum !== 0) {
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d0 /= sum;
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d1 /= sum;
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}
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var v1 = scale(v, -d0);
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var v2 = scale(v, d1);
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cp1 = add(point, v1);
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nextCp0 = add(point, v2);
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// 下一个控制点必须在这个点和下一个点之间
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nextCp0 = _min(nextCp0, _max(nextPoint, point));
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nextCp0 = _max(nextCp0, _min(nextPoint, point));
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// 重新计算 cp1 的值
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v1 = sub(nextCp0, point);
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v1 = scale(v1, -d0 / d1);
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cp1 = add(point, v1);
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// 上一个控制点必须要在上一个点和这一个点之间
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cp1 = _min(cp1, _max(prevPoint, point));
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cp1 = _max(cp1, _min(prevPoint, point));
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// 重新计算 nextCp0 的值
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v2 = sub(point, cp1);
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v2 = scale(v2, d1 / d0);
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nextCp0 = add(point, v2);
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if (hasConstraint) {
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cp1 = _max(cp1, min);
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cp1 = _min(cp1, max);
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nextCp0 = _max(nextCp0, min);
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nextCp0 = _min(nextCp0, max);
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}
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cps.push(cp0);
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cps.push(cp1);
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cp0 = nextCp0;
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}
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}
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if (isLoop) {
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cps.push(cps.shift());
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}
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return cps;
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}
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/**
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* create bezier spline from catmull rom spline
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* @param {Array} crp Catmull Rom Points
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* @param {boolean} z Spline is loop
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* @param {Array} constraint Constraint
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*/
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export function catmullRom2Bezier(crp, z, constraint) {
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var _a;
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if (z === void 0) { z = false; }
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if (constraint === void 0) { constraint = [
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[0, 0],
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[1, 1],
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]; }
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var isLoop = !!z;
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var pointList = [];
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for (var i = 0, l = crp.length; i < l; i += 2) {
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pointList.push([crp[i], crp[i + 1]]);
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}
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var controlPointList = smoothBezier(pointList, 0.4, isLoop, constraint);
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var len = pointList.length;
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var d1 = [];
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var cp1;
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var cp2;
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var p;
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for (var i = 0; i < len - 1; i += 1) {
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cp1 = controlPointList[i * 2];
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cp2 = controlPointList[i * 2 + 1];
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p = pointList[i + 1];
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d1.push(['C', cp1[0], cp1[1], cp2[0], cp2[1], p[0], p[1]]);
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}
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if (isLoop) {
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cp1 = controlPointList[len];
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cp2 = controlPointList[len + 1];
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_a = __read(pointList, 1), p = _a[0];
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d1.push(['C', cp1[0], cp1[1], cp2[0], cp2[1], p[0], p[1]]);
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}
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return d1;
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}
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//# sourceMappingURL=path.js.map
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