Simple Cursor Locker is a simple program to lock the cursor with the specific axis(X/Y axis). It's helpful in some design programs which do not have this feature.

SimpleCursorLocker.cpp

#include<cstdio>
#include<windows.h>
using namespace std;

bool IsKey(int key);
int main() {
     const int enableKeyX = VK_F6;
     const int enableKeyY = VK_F7;
     printf("//////////////////////////////\n");
     printf("==== Simple Cursor Locker ====\n");
     printf("//////////////////////////////\n");
     printf("Press F6 to lock mouse X, F7 to lock mouse Y\n");
     printf("The key detection is global, it works on any program.");
     POINT p;
     bool lockX = false, lockY = false;
     int lockPosX = 0, lockPosY = 0;
     while(1) {
          if (!GetCursorPos(&p)) {
               printf("For some unknown reason, I cannot get the cursor position by winapi\n");
               continue;
          }

          if (IsKey(enableKeyX)) {
               lockX = !lockX;
               if (lockX) {
                    printf("Lock mouse X in %d\n", p.x);
                    lockPosX = p.x;
               } else {
                    printf("Unlock mouse X\n");
               }
          } else if (IsKey(enableKeyY)) {
               lockY = !lockY;
               if (lockY) {
                    printf("Lock mouse Y in %d\n", p.y);
                    lockPosY = p.y;
               } else {
                    printf("Unlock mouse Y\n");
               }
          }

          if (lockX || lockY) {
               SetCursorPos(lockX? lockPosX : p.x, lockY ? lockPosY : p.y);
          }
     }
}

bool IsKey(int key) {
    if(GetKeyState(key) < 0)
    {
        while(GetKeyState(key)<0);
        return true;
    }
    else
        return false;
}