OpenHarmony图形处理库—pyclipper [GN编译]

news2024/11/24 3:30:00

简介

pyclipper是图形处理库，用于剪裁和偏移直线和多边形。

下载安装

直接在OpenHarmony-SIG仓中搜索pyclipper并下载。

使用说明

以OpenHarmony 3.1 Beta的rk3568版本为例

将下载的pyclipper库代码存在以下路径：./third_party/pyclipper
修改添加依赖的编译脚本，路径：/developtools/bytrace_standard/ohos.build


{
  "subsystem": "developtools",
  "parts": {
    "bytrace_standard": {
      "module_list": [
        "//developtools/bytrace_standard/interfaces/innerkits/native:bytrace_core",
        "//developtools/bytrace_standard/bin:bytrace_target",
        "//developtools/bytrace_standard/bin:bytrace.cfg",
        "//developtools/bytrace_standard/interfaces/kits/js/napi:bytrace",
        "//third_party/clipper:clipper",
        "//third_party/clipper:clipper_test"
      ],
      "inner_kits": [
        {
          "type": "so",
          "name": "//developtools/bytrace_standard/interfaces/innerkits/native:bytrace_core",
          "header": {
            "header_files": [
              "bytrace.h"
            ],
            "header_base": "//developtools/bytrace_standard/interfaces/innerkits/native/include"
          }
        }
      ],
      "test_list": [
        "//developtools/bytrace_standard/bin/test:unittest"
      ]
    }
  }
}

编译：./build.sh --product-name rk3568 --ccache
生成库文件和一些可执行测试文件，路径：out/rk3568/developtools/profiler

接口说明

图形取交（并，差，异或）：

import pyclipper
pc = pyclipper.Pyclipper()
pc.AddPaths(paths,pyclipper.PT_CLIP,True)
pc.AddPaths(squrd,pyclipper.PT_SUBJECT,True)
result = pc.Execute(pyclipper.CT_INTERSECTION,pyclipper.PFT_EVENODD,pyclipper.PFT_EVENODD)

图形内缩：

import pyclipper
pco = pyclipper.PyclipperOffset()
pco.AddPaths(points,pyclipper.JT_ROUND,pyclipper.ET_CLOSEDPOLYGON)
solution = pco.Execute(-int(line_width/2))

图形简化： pyclipper.SimplifyPolygons()
消除重复点(共线点)： pyclipper.CleanPolygons()
判断点与多边形的位置关系： pyclipper.PointInPolygon()

约束与兼容性

支持OpenHarmony API version 8。

目录结构

|---- pyclipper
|     |---- src
|           |---- clipper.cpp      #Bala Vatti剪裁算法的扩展
|     |---- tests                  #测试脚本文件
|     |---- README.md              #安装使用方法

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