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50 lines
1.8 KiB
Plaintext
50 lines
1.8 KiB
Plaintext
// Copyright (c) 2026 PaddlePaddle Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import "PDBPolygonOffsetBridge.h"
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#import <UIKit/UIKit.h>
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#include <cmath>
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#include "clipper.hpp"
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@implementation PDBPolygonOffsetBridge
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+ (NSArray<NSArray<NSValue *> *> *)inflateClosedPolygonWith:(NSArray<NSValue *> *)points
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distance:(double)distance {
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if (points.count < 2) {
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return @[];
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}
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using namespace ClipperLib;
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// Default miter limit and arc tolerance for ClipperOffset (round join).
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ClipperOffset co(2.0, 0.25);
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Path path;
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path.reserve(points.count);
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for (NSValue *v in points) {
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CGPoint p = v.CGPointValue;
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cInt ix = static_cast<cInt>(std::lround((double)p.x));
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cInt iy = static_cast<cInt>(std::lround((double)p.y));
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path.push_back(IntPoint(ix, iy));
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}
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co.AddPath(path, jtRound, etClosedPolygon);
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Paths solution;
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co.Execute(solution, distance);
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if (solution.empty()) {
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return @[];
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}
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const Path &out = solution[0];
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NSMutableArray *ring = [NSMutableArray arrayWithCapacity:out.size()];
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for (const IntPoint &pt : out) {
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[ring addObject:[NSValue valueWithCGPoint:CGPointMake((CGFloat)pt.X, (CGFloat)pt.Y)]];
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}
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return @[ ring ];
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}
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@end
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