setpixel1.cpp

#include <Windows.h>
#include <cmath>

int main() {
    int y = GetSystemMetrics(SM_CYSCREEN);
    int x = GetSystemMetrics(SM_CXSCREEN);
    int yfull = GetSystemMetrics(SM_CYFULLSCREEN);
    int xfull = GetSystemMetrics(SM_CXFULLSCREEN);
    int rainbow = x - rand() % x - (x / 150 - 112) % 149;
    int inc = round(x / 100);
    round(y / 1);
    round(yfull / 100);
    round(xfull / 10);
    while (1) {
        HDC hdc = GetDC(0);
        for (int yp = 0; yp < y; ++yp) {
            for (int xp = 0; xp < x; ++xp) {
                int xa = inc * xp;
                SetPixel(hdc, xp, yp, RGB(xa, xa, xa));
                SetPixel(hdc, yp, rainbow, RGB(yfull, xa, xfull));
                SetPixel(hdc, rainbow, rainbow, RGB(rainbow, rainbow, rainbow));
                SetPixel(hdc, rainbow, yp, RGB(xfull, yfull, xfull));
            }
        }
        ReleaseDC(0, hdc);
    }
}