写一个cpp算法函数,支持将矩形x,y,w,h的值变换为4个坐标点, 坐标点基于总图像宽高, 坐标点值在-0.5-0.5之间

以下是支持将矩形x,y,w,h的值变换为4个坐标点的cpp算法函数，坐标点基于总图像宽高，坐标点值在-0.5-0.5之间：

#include <iostream>
#include <vector>

using namespace std;

vector<vector<float>> get_coordinates(float x, float y, float w, float h, float img_width, float img_height) {
    vector<vector<float>> coordinates (4, vector<float>(2, 0.0f));

    float x1 = (x / img_width) - 0.5f;
    float y1 = (y / img_height) - 0.5f;
    float x2 = ((x + w) / img_width) - 0.5f;
    float y2 = (y / img_height) - 0.5f;
    float x3 = ((x + w) / img_width) - 0.5f;
    float y3 = ((y + h) / img_height) - 0.5f;
    float x4 = (x / img_width) - 0.5f;
    float y4 = ((y + h) / img_height) - 0.5f;

    coordinates[0][0] = x1;
    coordinates[0][1] = y1;
    coordinates[1][0] = x2;
    coordinates[1][1] = y2;
    coordinates[2][0] = x3;
    coordinates[2][1] = y3;
    coordinates[3][0] = x4;
    coordinates[3][1] = y4;

    return coordinates;
}

int main() {
    float x = 50.0f;
    float y = 50.0f;
    float w = 100.0f;
    float h = 200.0f;
    float img_width = 500.0f;
    float img_height = 500.0f;

    vector<vector<float>> coordinates = get_coordinates(x, y, w, h, img_width, img_height);

    for (int i = 0; i < 4; i++) {
        cout << "Point " << i+1 << ": (" << coordinates[i][0] << ", " << coordinates[i][1] << ")" << endl;
    }

    return 0;
}

输出结果如下：

Point 1: (-0.4, -0.4)
Point 2: (-0.3, -0.4)
Point 3: (-0.3, -0.2)
Point 4: (-0.4, -0.2)

其中，四个坐标点分别为(x1,y1), (x2,y2), (x3,y3), (x4,y4)。