Question

我在C ++中有这个void函数

void DrawFace(cv::Mat img, Window face)
{
    int x1 = face.x;
    int y1 = face.y;
    int x2 = face.width + face.x - 1;
    int y2 = face.width + face.y - 1;
    int centerX = (x1 + x2) / 2;
    int centerY = (y1 + y2) / 2;
    std::vector<cv::Point> pointList;
    pointList.push_back(RotatePoint(x1, y1, centerX, centerY, face.angle));
    pointList.push_back(RotatePoint(x1, y2, centerX, centerY, face.angle));
    pointList.push_back(RotatePoint(x2, y2, centerX, centerY, face.angle));
    pointList.push_back(RotatePoint(x2, y1, centerX, centerY, face.angle));
    DrawLine(img, pointList);
}

我想让我返回所做更改的pointList向量

void Drawface(cv::Mat img, Window face) 
{
    int x1 = face.x;
    int y1 = face.y;
    int x2 = face.width + face.x - 1;
    int y2 = face.width + face.y - 1;
    int centerX = (x1 + x2) / 2;
    int centerY = (y1 + y2) / 2;
    std::vector<cv::Point> pointList;
    pointList.push_back(RotatePoint(x1, y1, centerX, centerY, face.angle));
    pointList.push_back(RotatePoint(x1, y2, centerX, centerY, face.angle));
    pointList.push_back(RotatePoint(x2, y2, centerX, centerY, face.angle));
    pointList.push_back(RotatePoint(x2, y1, centerX, centerY, face.angle));
    return pointList
}

如果有人指出我出了问题的地方以及可以做出的改变，这将非常有帮助。

预先感谢

Answer 1

您的函数的返回类型仍为void。您需要更改它以反映身体的变化。另外，在return pointList之后缺少分号。

Answer 2

您需要声明函数的返回类型。

std::vector<cv::Point> Drawface(cv::Mat img, Window face) 
{
    int x1 = face.x;
    int y1 = face.y;
    int x2 = face.width + face.x - 1;
    int y2 = face.width + face.y - 1;
    int centerX = (x1 + x2) / 2;
    int centerY = (y1 + y2) / 2;
    std::vector<cv::Point> pointList;
    pointList.push_back(RotatePoint(x1, y1, centerX, centerY, face.angle));
    pointList.push_back(RotatePoint(x1, y2, centerX, centerY, face.angle));
    pointList.push_back(RotatePoint(x2, y2, centerX, centerY, face.angle));
    pointList.push_back(RotatePoint(x2, y1, centerX, centerY, face.angle));
    return pointList;
}

转换void以返回某些内容

2 个答案: