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grasm-lib

v1.0.5

Published

A Rust WASM library for image processing graphics algorithms.

Downloads

331

Readme

./doc/demo/demo1.PNG

1. 点在多边形内部判断函数

JavaScript 调用示例

// 浏览器环境
import init, { point_in_polygon_rayster } from "./out/rust_wasm_lib.js";

init().then(() => {
  // 创建点云数据
  const points = new Float32Array([1.0, 1.5, 2.5, 0.5, 4.0, 1.5]);

  // 创建多边形数据
  const polygon = new Float32Array([
    0.0,
    0.0,
    3.0,
    0.0,
    3.0,
    3.0,
    0.0,
    3.0, // 外部多边形
    1.0,
    1.0,
    2.0,
    1.0,
    2.0,
    2.0,
    1.0,
    2.0, // 内部洞
  ]);

  // 定义多边形拆分
  const rings = new Uint32Array([4]);

  // 调用 Rust 函数
  const result = point_in_polygon_rayster(points, polygon, rings, true);
  console.log(result); // 输出: Uint32Array [0, 1, 0]
});

// Node.js 环境
const { point_in_polygon_rayster } = require("./out/rust_wasm_lib.js");

async function main() {
  // 创建点云数据
  const points = new Float32Array([1.0, 1.5, 2.5, 0.5, 4.0, 1.5]);

  // 创建多边形数据
  const polygon = new Float32Array([
    0.0,
    0.0,
    3.0,
    0.0,
    3.0,
    3.0,
    0.0,
    3.0, // 外部多边形
    1.0,
    1.0,
    2.0,
    1.0,
    2.0,
    2.0,
    1.0,
    2.0, // 内部洞
  ]);

  // 定义多边形拆分
  const rings = new Uint32Array([4]);

  // 调用 Rust 函数
  const result = await point_in_polygon_rayster(points, polygon, rings, true);
  console.log(result); // 输出: Uint32Array [0, 1, 0]
}

main().catch(console.error);

参数说明

  1. points: Float32Array - 点云坐标,格式为 [x1, y1, x2, y2, ...]
  2. polygon: Float32Array - 多边形路径点,格式为 [x1, y1, x2, y2, ...]
  3. rings: Uint32Array - 多边形拆分索引,例如 [4] 表示前 4 个点为外部多边形,剩余点为内部洞
  4. boundary_is_inside: boolean - 边界上的点是否视为内部,默认为 true

返回值

Uint32Array - 每个点是否在多边形内部的结果,1 表示在内部,0 表示在外部