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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use geom::point::Point2D;
use geom::rect::Rect;
use geom::size::Size2D;
use std::num::{NumCast, One, Zero};
#[deriving(Clone,Eq)]
pub struct Au(i32);
impl Add<Au,Au> for Au {
fn add(&self, other: &Au) -> Au { Au(**self + **other) }
}
impl Sub<Au,Au> for Au {
fn sub(&self, other: &Au) -> Au { Au(**self - **other) }
}
impl Mul<Au,Au> for Au {
fn mul(&self, other: &Au) -> Au { Au(**self * **other) }
}
impl Div<Au,Au> for Au {
fn div(&self, other: &Au) -> Au { Au(**self / **other) }
}
impl Rem<Au,Au> for Au {
fn rem(&self, other: &Au) -> Au { Au(**self % **other) }
}
impl Neg<Au> for Au {
fn neg(&self) -> Au { Au(-**self) }
}
impl Ord for Au {
fn lt(&self, other: &Au) -> bool { **self < **other }
fn le(&self, other: &Au) -> bool { **self <= **other }
fn ge(&self, other: &Au) -> bool { **self >= **other }
fn gt(&self, other: &Au) -> bool { **self > **other }
}
impl One for Au {
fn one() -> Au { Au(1) }
}
impl Zero for Au {
fn zero() -> Au { Au(0) }
fn is_zero(&self) -> bool { **self == 0 }
}
impl Num for Au {}
pub fn min(x: Au, y: Au) -> Au { if x < y { x } else { y } }
pub fn max(x: Au, y: Au) -> Au { if x > y { x } else { y } }
impl NumCast for Au {
fn from<T:ToPrimitive>(n: T) -> Option<Au> {
Some(Au(n.to_i32().unwrap()))
}
}
impl ToPrimitive for Au {
fn to_i64(&self) -> Option<i64> {
Some(**self as i64)
}
fn to_u64(&self) -> Option<u64> {
Some(**self as u64)
}
}
pub fn box<T:Clone + Ord + Add<T,T> + Sub<T,T>>(x: T, y: T, w: T, h: T) -> Rect<T> {
Rect(Point2D(x, y), Size2D(w, h))
}
impl Au {
pub fn scale_by(self, factor: f64) -> Au {
Au(((*self as f64) * factor).round() as i32)
}
pub fn from_px(px: int) -> Au {
NumCast::from(px * 60).unwrap()
}
pub fn to_nearest_px(&self) -> int {
((**self as f64) / 60f64).round() as int
}
pub fn to_snapped(&self) -> Au {
let res = **self % 60i32;
return if res >= 30i32 { return Au(**self - res + 60i32) }
else { return Au(**self - res) };
}
pub fn zero_point() -> Point2D<Au> {
Point2D(Au(0), Au(0))
}
pub fn zero_rect() -> Rect<Au> {
let z = Au(0);
Rect(Point2D(z, z), Size2D(z, z))
}
pub fn from_pt(pt: f64) -> Au {
from_px(pt_to_px(pt) as int)
}
pub fn from_frac_px(px: f64) -> Au {
Au((px * 60f64) as i32)
}
pub fn min(x: Au, y: Au) -> Au { if *x < *y { x } else { y } }
pub fn max(x: Au, y: Au) -> Au { if *x > *y { x } else { y } }
}
// assumes 72 points per inch, and 96 px per inch
pub fn pt_to_px(pt: f64) -> f64 {
pt / 72f64 * 96f64
}
// assumes 72 points per inch, and 96 px per inch
pub fn px_to_pt(px: f64) -> f64 {
px / 96f64 * 72f64
}
pub fn zero_rect() -> Rect<Au> {
let z = Au(0);
Rect(Point2D(z, z), Size2D(z, z))
}
pub fn zero_point() -> Point2D<Au> {
Point2D(Au(0), Au(0))
}
pub fn zero_size() -> Size2D<Au> {
Size2D(Au(0), Au(0))
}
pub fn from_frac_px(px: f64) -> Au {
Au((px * 60f64) as i32)
}
pub fn from_px(px: int) -> Au {
NumCast::from(px * 60).unwrap()
}
pub fn to_px(au: Au) -> int {
(*au / 60) as int
}
pub fn to_frac_px(au: Au) -> f64 {
(*au as f64) / 60f64
}
// assumes 72 points per inch, and 96 px per inch
pub fn from_pt(pt: f64) -> Au {
from_px((pt / 72f64 * 96f64) as int)
}
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