cuda draws polygons

1. Implementation idea

A polygon is composed of multiple straight lines, so you can form a polygon by drawing multiple straight lines connected end to end

2. Code implementation

void drawPolygon(cv::cuda::GpuMat& nv12Frame, const std::vector<cv::Point>& vertices, cv::Scalar color, int thickness)
{
    
    

	for (int i = 0;i<vertices.size();i++)
	{
    
    
		//最后一个点和第一个点组成一条线
		if (i + 1 == vertices.size())
		{
    
    
			int last_pos = vertices.size() - 1;
			drawLine(nv12Frame, {
    
     vertices.at(0).x, vertices.at(0).y }, {
    
     vertices.at(last_pos).x, vertices.at(last_pos).y }, thickness, color);
		}
		else 
		{
    
    
			drawLine(nv12Frame, {
    
     vertices.at(i).x, vertices.at(i).y }, {
    
     vertices.at(i + 1).x, vertices.at(i + 1).y }, thickness, color);
		}
	}
}

The implementation of drawLine uses cuda to draw a straight line in the previous blog post