Spiral generator

spiral.cpp

//Spirals
//┌─────────┐
//│┌───────┐│
//││┌─────┐││
//│││┌───┐│││
//││││┌─┐││││
//│││││└┘││││
//││││└──┘│││
//│││└────┘││
//││└──────┘│
//│└────────┘
//└──────────

#include <stdio.h>
#include <stdint.h>

#define SIZE 24

int main()
{
const int32_t dx[] = { 0, -1, 0, 1 }, dy[] = { -1, 0, 1, 0 };
int32_t x = SIZE - 1, y = SIZE;
uint32_t **Grid = new uint32_t*[SIZE];
for( size_t i = 0; i < SIZE; i++ )
{
	Grid[i] = new uint32_t[SIZE];
}
for( size_t i = 0, dir = 0; i < (SIZE << 1) - 1; ++i, dir = i & 3 )
{
	for( size_t j = 0, js = ((SIZE << 1) - i) / 2; j < js; ++j )
	{
		Grid[x += dx[dir]][y += dy[dir]] = j + 1 == js ? "\xC0\xDA\xBF\xd9"[dir] : "\xC4\xB3"[dir & 1];
	}
}
for( size_t i = 0; i < SIZE*SIZE; i++ )
{
	putchar(Grid[i / SIZE][i % SIZE]);
	(i + 1) % SIZE == 0 ? putchar('\n') : 0;
}
for( size_t i = 0; i < SIZE; i++ )
{
	delete[] Grid[i];
}
delete[] Grid;
	return 0;
}