Diffusion Ant (ast) Code

ant/examples/demo/mandelbrot.js
32b18f1b1662ast

mandelbrot.js
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			function mandelbrot(center_x, center_y, scale, w, h, max_it) {
			const colors = [14, 15, 7, 8, 0, 4, 12, 5, 13, 1, 9, 3, 11, 10, 2, 6];
			const numColors = colors.length;
			const fx = (scale * 0.5) / Math.min(w, h);
			const fy = fx * 2;
			const halfW = w * 0.5;
			const halfH = h * 0.5;

			const cxArr = new Float64Array(w);
			for (let x1 = 0; x1 < w; x1++) {
			cxArr[x1] = (x1 - halfW) * fx + center_x;
			}

			function iterate(cx, cy) {
			const q = (cx - 0.25) * (cx - 0.25) + cy * cy;
			if (q * (q + (cx - 0.25)) <= 0.25 * cy * cy) return max_it;

			const cx1 = cx + 1;
			if (cx1 * cx1 + cy * cy <= 0.0625) return max_it;

			let x = 0,
			y = 0,
			x2 = 0,
			y2 = 0;
			let i = 0;

			while (i < max_it && x2 + y2 < 4) {
			y = 2 * x * y + cy;
			x = x2 - y2 + cx;
			x2 = x * x;
			y2 = y * y;
			i++;
			}
			return i;
			}

			const output = [];

			for (let y1 = 0; y1 < h; y1++) {
			const cy0 = (y1 - halfH) * fy + center_y;
			const cy1 = (y1 + 0.5 - halfH) * fy + center_y;
			const chars = new Array(w + 1);

			for (let x1 = 0; x1 < w; x1++) {
			const cx = cxArr[x1];

			const i0 = iterate(cx, cy0);
			const i1 = iterate(cx, cy1);

			const c0 = i0 >= max_it ? 0 : colors[i0 % numColors];
			const c1 = i1 >= max_it ? 0 : colors[i1 % numColors];

			const fg = c0 >= 8 ? 82 + c0 : 30 + c0;
			const bg = c1 >= 8 ? 92 + c1 : 40 + c1;

			chars[x1] = '\x1b[' + fg + ';' + bg + 'm\u2580';
			}
			chars[w] = '\x1b[0m';
			output.push(chars.join(''));
			}

			console.log(output.join('\n'));
			}

			mandelbrot(-0.75, 0.0, 2.0, 80, 25, 50);

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