Draw a sphere: Difference between revisions

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<lang d>import std.stdio, std.math, std.algorithm, std.numeric;

enum shades = ".:!*oe&#%@";

double[3] light = [30, 30, -50];

void normalize(ref double[3] v) {

double len = sqrt(dotProduct(v[], v[]));

v[0] /= len; v[1] /= len; v[2] /= len;

}

double dot(const ref double[3] x, const ref double[3] y) {

double d = dotProduct(x[], y[]);

return d < 0 ? -d : 0;

}

void ~~draw_sphere~~(double R, double k, double ambient) {

void drawSphere(double R, double k, double ambient) {

enum shades = ".:!*oe&#%@";

double[3] vec;

foreach (int i; cast(int)floor(-R) .. cast(int)ceil(R) + 1) {

const double x = i + 0.5;

foreach (int j; cast(int)floor(-2 * R) .. cast(int)ceil(2 * R) + 1) {

foreach (int j; cast(int)floor(-2*R)..cast(int)ceil(2*R)+1){

const double y = j / 2. + 0.5;

if (x * x + y * y <= R * R) {

if (x ^^ 2 + y ^^ 2 <= R ^^ 2) {

vec = [x, y, ~~sqrt~~(R * R - x ^^ 2 - y ^^ 2)];

double[3] vec = [x, y, (R^^2 - x^^2 - y^^2) ^^ 0.5];

vec.normalize();

const double b = dot(light, vec) ^^ k + ambient;

int intensity = cast(int)((1 - b) * (shades.length - 1));

int intensity = cast(int)((1-b) * (shades.length-1));

intensity = min(shades.length-1, max(intensity, 0));

putchar(shades[intensity]);

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}

void main() {

normalize(light);

~~draw_sphere~~(20, 4, 0.1);

drawSphere(20, 4, 0.1);

~~draw_sphere~~(10, 2, 0.4);

drawSphere(10, 2, 0.4);

}</lang>