fix comment and logic lmao

gaje ck

Author: Mrezadwiprasetiawan

image/PNG/src/prime-art.cxx

@@ -82,8 +82,8 @@ int main(int argc, const char* argv[]) {
    *
    * ketika i = s * s gw mau r = halfdiagonal = sqrt(2)/2 * s
    * sehingga r = dR * s * s = sqrt(2)/2 * s
-   * dR * s = sqrt(2)/2 * s
-   * dR = sqrt(2)/2
+   * dR * s = sqrt(2)/2
+   * dR = sqrt(2)/2/s
    */
 
   /* Solve dTheta
@@ -95,7 +95,7 @@ int main(int argc, const char* argv[]) {
    * dTheta = 2/sqrt(2) * sqrt(i)
    */
 
-  float dR = 0.5 * std::sqrt(2.0f);
+  float dR = 0.5f * 1/(float)(WIDTH > HEIGHT? WIDTH :HEIGHT) * std::sqrt(2.0f);
   const uint64_t cx = WIDTH / 2;
   const uint64_t cy = HEIGHT / 2;