Koch curve: Difference between revisions

Line 140:

double x0, y0, x1, y1;

size_t j = 0;

for (size_t i = 0; i + 1 < size; ++i~~, j += 4~~) {

for (size_t i = 0; i + 1 < size; ++i) {

x0 = points[i].x;

y0 = points[i].y;

Line 147:

double dy = y1 - y0;

double dx = x1 - x0;

output[j].x = x0;

output[j++] = {x0, y0};

output[j].y = y0;

output[j++] = {x0 + dx/3, y0 + dy/3};

output[j + 1].x = x0 + dx/3;

output[j++] = {x0 + dx/2 - dy * sqrt3_2/3, y0 + dy/2 + dx * sqrt3_2/3};

output[j + 1].y = y0 + dy/3;

output[j++] = {x0 + 2 * dx/3, y0 + 2 * dy/3};

output[j + 2].x = x0 + dx/2 - dy * sqrt3_2/3;

output[j + 2].y = y0 + dy/2 + dx * sqrt3_2/3;

output[j + 3].x = x0 + 2 * dx/3;

output[j + 3].y = y0 + 2 * dy/3;

}

output[j].x = x1;

output[j] = {x1, y1};

output[j].y = y1;

return output;

}

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Line 164:

{x + length/2, y + length * sqrt3_2},

{x + length, y},

{x, y},

{x, y}

};

for (int i = 0; i < iterations; ++i)

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Line 175:

<< size << "' height='" << size << "'>\n";

out << "<rect width='100%' height='100%' fill='black'/>\n";

out << "<path stroke-width='1' stroke='white' fill='none' d='M ";

out << "<path stroke-width='1' stroke='white' fill='none' d='";

auto points(koch_points(size, iterations));

size_t n = points.size();

for (size_t i = 0, n = points.size(); i < n; ++i)

⚫

out << (i == 0 ? "M" : "L") << points[i].x << ',' << points[i].y << '\n';

if (n > 0) {

out << points[0].x << ',' << points[0].y << ' ';

for (size_t i = 1; i < n; ++i)

⚫

~~out~~ << "L " << points[i].x << ',' << points[i].y << '\n';

}

out << "z'/>\n</svg>\n";

}