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use ffi::*;
use libc::*;
use std::mem;
#[derive(Copy, Clone)]
pub struct Transform(ALLEGRO_TRANSFORM);
unsafe impl Send for Transform {}
impl Transform
{
pub fn identity() -> Transform
{
Transform(unsafe {
let mut t = mem::uninitialized();
al_identity_transform(&mut t);
t
})
}
pub fn wrap(t: ALLEGRO_TRANSFORM) -> Transform
{
Transform(t)
}
pub fn build(x: f32, y: f32, sx: f32, sy: f32, theta: f32) -> Transform
{
Transform(unsafe {
let mut t = mem::uninitialized();
al_build_transform(&mut t, x as c_float, y as c_float, sx as c_float, sy as c_float, theta as c_float);
t
})
}
pub fn get_allegro_transform(&self) -> ALLEGRO_TRANSFORM
{
self.0
}
pub fn get_matrix(&self) -> &[[f32; 4]; 4]
{
&self.0.m
}
pub fn get_matrix_mut(&mut self) -> &mut [[f32; 4]; 4]
{
&mut self.0.m
}
pub fn translate(&mut self, x: f32, y: f32)
{
unsafe {
al_translate_transform(&mut self.0, x as c_float, y as c_float);
}
}
pub fn rotate(&mut self, theta: f32)
{
unsafe {
al_rotate_transform(&mut self.0, theta as c_float);
}
}
pub fn scale(&mut self, sx: f32, sy: f32)
{
unsafe {
al_scale_transform(&mut self.0, sx as c_float, sy as c_float);
}
}
pub fn transform_coordinates(&self, x: f32, y: f32) -> (f32, f32)
{
let mut x = x as c_float;
let mut y = y as c_float;
unsafe {
al_transform_coordinates(&self.0, &mut x, &mut y);
}
(x as f32, y as f32)
}
pub fn compose(&mut self, other: &Transform)
{
unsafe {
al_compose_transform(&mut self.0, &other.0);
}
}
pub fn invert(&mut self)
{
unsafe {
al_invert_transform(&mut self.0);
}
}
pub fn check_inverse(&self, tol: f32) -> bool
{
unsafe { al_check_inverse(&self.0, tol as c_float) != 0 }
}
}