74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
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#include "Transform.h"
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#include <math.h>
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Transform::Transform()
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{
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m_matrix = Matrix::identity();
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}
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void Transform::translate(double x, double y, double z)
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{
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Matrix t = Matrix::identity();
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t[0][3] = x;
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t[1][3] = y;
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t[2][3] = z;
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m_matrix *= t;
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}
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void Transform::rotate(double angle, double xv, double yv, double zv)
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{
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/* formula from http://en.wikipedia.org/wiki/Rotation_matrix */
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Vector l(xv, yv, zv);
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l.normalize();
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double c = cos(angle);
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double s = sin(angle);
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double lx2 = l[0] * l[0];
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double ly2 = l[1] * l[1];
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double lz2 = l[2] * l[2];
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Matrix t = Matrix::identity();
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t[0][0] = lx2 + (1 - lx2) * c;
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t[0][1] = l[0] * l[1] * (1 - c) - l[2] * s;
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t[0][2] = l[0] * l[2] * (1 - c) + l[1] * s;
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t[1][0] = l[0] * l[1] * (1 - c) + l[2] * s;
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t[1][1] = ly2 + (1 - ly2) * c;
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t[1][2] = l[1] * l[2] * (1 - c) - l[0] * s;
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t[2][0] = l[0] * l[2] * (1 - c) - l[1] * s;
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t[2][1] = l[1] * l[2] * (1 - c) + l[0] * s;
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t[2][2] = lz2 + (1 - lz2) * c;
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m_matrix *= t;
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}
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void Transform::scale(double xs, double ys, double zs)
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{
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Matrix t = Matrix::identity();
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t[0][0] = xs;
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t[1][1] = ys;
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t[2][2] = zs;
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m_matrix *= t;
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}
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Vector Transform::transform_point(Transform & t, const Vector & v)
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{
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return t.getMatrix() * v;
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}
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Vector Transform::transform_direction(Transform & t, const Vector & v)
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{
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return t.getMatrix() % v;
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}
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Ray Transform::transform_ray(Transform & t, const Ray & r)
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{
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Vector newPosition = t.getMatrix() * r.getOrigin();
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Vector newDirection = t.getMatrix() % r.getDirection();
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Ray res(newPosition, newDirection);
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return res;
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}
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