52 lines
1.1 KiB
C++
52 lines
1.1 KiB
C++
// -*- C++ -*-
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#include <algorithm>
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#include <stdlib.h>
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#include "vector.h"
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using namespace mbostock;
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const Vector& Vector::ZERO() {
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static const Vector v;
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return v;
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}
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const Vector& Vector::X() {
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static const Vector v(1.f, 0.f, 0.f);
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return v;
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}
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const Vector& Vector::Y() {
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static const Vector v(0.f, 1.f, 0.f);
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return v;
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}
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const Vector& Vector::Z() {
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static const Vector v(0.f, 0.f, 1.f);
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return v;
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}
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const Vector& Vector::INF() {
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static const Vector v(INFINITY, INFINITY, INFINITY);
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return v;
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}
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static float randomf() {
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return random() / (float) RAND_MAX;
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}
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Vector Vector::min(const Vector& a, const Vector& b) {
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return Vector(std::min(a.x, b.x), std::min(a.y, b.y), std::min(a.z, b.z));
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}
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Vector Vector::max(const Vector& a, const Vector& b) {
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return Vector(std::max(a.x, b.x), std::max(a.y, b.y), std::max(a.z, b.z));
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}
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Vector Vector::randomVector(float k) {
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Vector v(randomf() - .5f, randomf() - .5f, randomf() - .5f);
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return ((v.x == 0.f) && (v.y == 0.f) && (v.z == 0.f))
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? Vector(k, 0.f, 0.f) // very unlikely, but still...
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: v.normalize() * k;
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}
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