GLfloat rotation_ratio; // ratio thru rotation anim, or -1
NSSize rot_from, rot_to; // start size rect, end size rect
GLfloat angle_from, angle_to; // start angle, end angle
double rot_start_time;
GLfloat rotation_ratio; // ratio thru rotation anim, or -1
NSSize rot_from, rot_to; // start size rect, end size rect
GLfloat angle_from, angle_to; // start angle, end angle
double rot_start_time;