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use std::mem;
use std::ops::Mul;
use ui_sys::{self, uiDrawMatrix};
#[derive(Copy, Clone, PartialEq, Debug)]
pub struct Transform {
ui_matrix: uiDrawMatrix,
}
impl Transform {
pub fn from_ui_matrix(ui_matrix: &uiDrawMatrix) -> Transform {
Transform {
ui_matrix: *ui_matrix,
}
}
pub fn identity() -> Transform {
unsafe {
let mut matrix = mem::uninitialized();
ui_sys::uiDrawMatrixSetIdentity(&mut matrix);
Transform::from_ui_matrix(&matrix)
}
}
pub fn translate(&mut self, x: f64, y: f64) {
unsafe { ui_sys::uiDrawMatrixTranslate(&mut self.ui_matrix, x, y) }
}
pub fn scale(&mut self, x_center: f64, y_center: f64, x: f64, y: f64) {
unsafe { ui_sys::uiDrawMatrixScale(&mut self.ui_matrix, x_center, y_center, x, y) }
}
pub fn rotate(&mut self, x: f64, y: f64, angle: f64) {
unsafe { ui_sys::uiDrawMatrixRotate(&mut self.ui_matrix, x, y, angle) }
}
pub fn skew(&mut self, x: f64, y: f64, xamount: f64, yamount: f64) {
unsafe { ui_sys::uiDrawMatrixSkew(&mut self.ui_matrix, x, y, xamount, yamount) }
}
pub fn compose(&mut self, src: &Transform) {
unsafe { ui_sys::uiDrawMatrixMultiply(&mut self.ui_matrix, src.ptr()) }
}
pub fn invertible(&self) -> bool {
unsafe {
ui_sys::uiDrawMatrixInvertible(
&self.ui_matrix as *const uiDrawMatrix as *mut uiDrawMatrix,
) != 0
}
}
pub fn invert(&mut self) -> bool {
unsafe { ui_sys::uiDrawMatrixInvert(&mut self.ui_matrix) != 0 }
}
pub fn transform_point(&self, mut point: (f64, f64)) -> (f64, f64) {
unsafe {
ui_sys::uiDrawMatrixTransformPoint(
&self.ui_matrix as *const uiDrawMatrix as *mut uiDrawMatrix,
&mut point.0,
&mut point.1,
);
point
}
}
pub fn transform_size(&self, mut size: (f64, f64)) -> (f64, f64) {
unsafe {
ui_sys::uiDrawMatrixTransformSize(
&self.ui_matrix as *const uiDrawMatrix as *mut uiDrawMatrix,
&mut size.0,
&mut size.1,
);
size
}
}
pub fn ptr(&self) -> *mut uiDrawMatrix {
&self.ui_matrix as *const uiDrawMatrix as *mut uiDrawMatrix
}
}
impl Mul<Transform> for Transform {
type Output = Transform;
fn mul(mut self, other: Transform) -> Transform {
self.compose(&other);
self
}
}