Box2D::Box2D(const AABox2D& b) {
for (int i = 0; i < 4; ++i) {
m_corner[i] = b.corner(i);
}
computeAxes();
}
Box2D::Box2D(const Vector2& center, float w, float h, float angle) {
Vector2 X( cos(angle), sin(angle));
Vector2 Y(-sin(angle), cos(angle));
X *= w / 2;
Y *= h / 2;
m_corner[0] = center - X - Y;
m_corner[1] = center + X - Y;
m_corner[2] = center + X + Y;
m_corner[3] = center - X + Y;
computeAxes();
}
OBB::OBB(const AABB& aabb)
{
corner[0] = vec2(aabb.x1,aabb.y1);
corner[1] = vec2(aabb.x2,aabb.y1);
corner[2] = vec2(aabb.x2,aabb.y2);
corner[3] = vec2(aabb.x1,aabb.y2);
// rotate by current matrix
mat4 mt = glGetCurrentMatrix(GL_MODELVIEW_MATRIX);
for (int c = 0; c < 4; ++c)
corner[c] = vec2(transformPoint(mt,vec3(corner[c])));
computeAxes();
}
Box2D::Box2D(const CFrame& frame, Box2D& b) {
for (int i = 0; i < 4; ++i) {
m_corner[i] = frame.pointToWorldSpace(Vector3(b.corner(i), 0)).xy();
}
computeAxes();
}