Why the Vec3b can't be initialized as an array? - c++

Question

I wanted to try that
Vec3b colorsense = {
map.at<Vec3b>(trace.move_up(1)),
map.at<Vec3b>(trace.move_down(1)),
map.at<Vec3b>(trace.move_left(1)),
map.at<Vec3b>(trace.move_right(1)),
map.at<Vec3b>(trace.move_upright(1)),
map.at<Vec3b>(trace.move_upleft(1)),
map.at<Vec3b>(trace.move_downright(1)),
map.at<Vec3b>(trace.move_downleft(1))};
can be usable, but after testing it, I don
t think that it work. oh and the function trace.move_up are all points in the matrix map
This is my entire main code:
#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include "Trace.h"
// Macros
#define log(x) std::cout << x << std::endl;
#define error(x) std::cerr << x << std::endl;
// using namespaces:
//using namespace cv;
//using namespace std;
// enum;
enum {up = 0, down = 1, left = 2, right = 3, upright = 4, upleft = 5, downright = 6, downleft = 7};
// Main function;
int main() {
try {
int x = 0,movement;
Trace trace(0, 0);
Mat map = imread("tmp.bmp"), edges;
resize(map, map, {1028, 672}, 0, 0, INTER_NEAREST_EXACT);
std::vector<Vec3b> colorsense = {
map.at<Vec3b>(trace.move_up(1)),
map.at<Vec3b>(trace.move_down(1)),
map.at<Vec3b>(trace.move_left(1)),
map.at<Vec3b>(trace.move_right(1)),
map.at<Vec3b>(trace.move_upright(1)),
map.at<Vec3b>(trace.move_upleft(1)),
map.at<Vec3b>(trace.move_downright(1)),
map.at<Vec3b>(trace.move_downleft(1))};
switch (movement) {
case up:
colorsense[up];
break;
case down:
colorsense[down];
break;
case left:
colorsense[left];
break;
case right:
colorsense[right];
break;
case upright:
colorsense[upright];
break;
case upleft:
colorsense[upleft];
break;
case downright:
colorsense[downright];
break;
case downleft:
colorsense[downleft];
break;
default:
movement = right;
break;
}
for (int i = 0; i < 1000; i++){
trace.draw(map, 255, 0, 0, 1);
if(colorsense[right][0]== 255 || colorsense[right][1]== 255 || colorsense[right][2]== 255){
trace.move_downright(0);
} else {
trace.move_right(0);
}
namedWindow("map");
imshow("map", map);
waitKey(10);
}
// Canny(map,edges,100,100,3,false);
// Laplacian(map,map, CV_64F);
log(map.rows);
log(map.cols);
if (map.empty()) {
error("Could not load image");
return EXIT_FAILURE;
}
namedWindow("map");
imshow("map", map);
waitKey();
log("Hello World");
}
catch(const char* msg){
error(msg);
}
return 0;
}
The for loop you guys see here is the loop that draws the line. But with the function i wrote, it won't be able to change direction when the black objects is close.
But when i write the if statement similar like this
map.at<Vec3b>(trace.move_up(1))[0]
map.at<Vec3b>(trace.move_up(1))[1]
map.at<Vec3b>(trace.move_up(1))[2]
Then it works..., why?