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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 std::default::Default;
use std::num::{NumCast, One, Zero};
use std::fmt;
// An Au is an "App Unit" and represents 1/60th of a CSS pixel. It was
// originally proposed in 2002 as a standard unit of measure in Gecko.
// See https://bugzilla.mozilla.org/show_bug.cgi?id=177805 for more info.
#[deriving(Clone, Eq, Ord, Zero)]
pub struct Au(pub i32);
impl Default for Au {
#[inline]
fn default() -> Au {
Au(0)
}
}
impl fmt::Show for Au {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let Au(n) = *self;
write!(f.buf, "Au({})", n)
}}
impl Add<Au,Au> for Au {
#[inline]
fn add(&self, other: &Au) -> Au {
let Au(s) = *self;
let Au(o) = *other;
Au(s + o)
}
}
impl Sub<Au,Au> for Au {
#[inline]
fn sub(&self, other: &Au) -> Au {
let Au(s) = *self;
let Au(o) = *other;
Au(s - o)
}
}
impl Mul<Au,Au> for Au {
#[inline]
fn mul(&self, other: &Au) -> Au {
let Au(s) = *self;
let Au(o) = *other;
Au(s * o)
}
}
impl Div<Au,Au> for Au {
#[inline]
fn div(&self, other: &Au) -> Au {
let Au(s) = *self;
let Au(o) = *other;
Au(s / o)
}
}
impl Rem<Au,Au> for Au {
#[inline]
fn rem(&self, other: &Au) -> Au {
let Au(s) = *self;
let Au(o) = *other;
Au(s % o)
}
}
impl Neg<Au> for Au {
#[inline]
fn neg(&self) -> Au {
let Au(s) = *self;
Au(-s)
}
}
impl One for Au {
#[inline]
fn one() -> Au { Au(1) }
}
impl Num for Au {}
#[inline]
pub fn min(x: Au, y: Au) -> Au { if x < y { x } else { y } }
#[inline]
pub fn max(x: Au, y: Au) -> Au { if x > y { x } else { y } }
impl NumCast for Au {
#[inline]
fn from<T:ToPrimitive>(n: T) -> Option<Au> {
Some(Au(n.to_i32().unwrap()))
}
}
impl ToPrimitive for Au {
#[inline]
fn to_i64(&self) -> Option<i64> {
let Au(s) = *self;
Some(s as i64)
}
#[inline]
fn to_u64(&self) -> Option<u64> {
let Au(s) = *self;
Some(s as u64)
}
#[inline]
fn to_f32(&self) -> Option<f32> {
let Au(s) = *self;
s.to_f32()
}
#[inline]
fn to_f64(&self) -> Option<f64> {
let Au(s) = *self;
s.to_f64()
}
}
impl Au {
/// FIXME(pcwalton): Workaround for lack of cross crate inlining of newtype structs!
#[inline]
pub fn new(value: i32) -> Au {
Au(value)
}
#[inline]
pub fn scale_by(self, factor: f64) -> Au {
let Au(s) = self;
Au(((s as f64) * factor) as i32)
}
#[inline]
pub fn from_px(px: int) -> Au {
NumCast::from(px * 60).unwrap()
}
#[inline]
pub fn to_nearest_px(&self) -> int {
let Au(s) = *self;
((s as f64) / 60f64).round() as int
}
#[inline]
pub fn to_snapped(&self) -> Au {
let Au(s) = *self;
let res = s % 60i32;
return if res >= 30i32 { return Au(s - res + 60i32) }
else { return Au(s - res) };
}
#[inline]
pub fn from_pt(pt: f64) -> Au {
from_px(pt_to_px(pt) as int)
}
#[inline]
pub fn from_frac_px(px: f64) -> Au {
Au((px * 60f64) as i32)
}
#[inline]
pub fn min(x: Au, y: Au) -> Au {
let Au(xi) = x;
let Au(yi) = y;
if xi < yi { x } else { y }
}
#[inline]
pub fn max(x: Au, y: Au) -> Au {
let Au(xi) = x;
let Au(yi) = y;
if xi > yi { 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 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 {
let Au(a) = au;
(a / 60) as int
}
pub fn to_frac_px(au: Au) -> f64 {
let Au(a) = au;
(a 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)
}
// assumes 72 points per inch, and 96 px per inch
pub fn to_pt(au: Au) -> f64 {
let Au(a) = au;
(a as f64) / 60f64 * 72f64 / 96f64
}
/// Returns true if the rect contains the given point. Points on the top or left sides of the rect
/// are considered inside the rectangle, while points on the right or bottom sides of the rect are
/// not considered inside the rectangle.
pub fn rect_contains_point<T:Ord + Add<T,T>>(rect: Rect<T>, point: Point2D<T>) -> bool {
point.x >= rect.origin.x && point.x < rect.origin.x + rect.size.width &&
point.y >= rect.origin.y && point.y < rect.origin.y + rect.size.height
}
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