Crate emath

Opinionated 2D math library for building GUIs.

Includes vectors, positions, rectangles etc.

Conventions (unless otherwise specified):

• All angles are in radians
• X+ is right and Y+ is down.
• (0,0) is left top.
• Dimension order is always x y

Re-exports

pub use align::Align;

pub use align::Align2;

Modules

align	One- and two-dimensional alignment (Align::Center, Align2::LEFT_TOP etc).
smart_aim	Find "simple" numbers is some range. Used by sliders.

Structs

Pos2	A position on screen.
Rect	A rectangular region of space.
Rot2	Represents a rotation in the 2D plane. A rotation of 𝞃/4 = 90° rotates the X axis to the Y axis. Normally a Rot2 is normalized (unit-length). If not, it will also scale vectors.
Vec2	A vector has a direction and length. A Vec2 is often used to represent a size.

Traits

NumExt	Extends f32, Vec2 etc with at_least and at_most as aliases for max and min.
One	Helper trait to implement lerp and remap.
Real	Helper trait to implement lerp and remap.

Functions

almost_equal	Return true when arguments are the same within some rounding error.
clamp	Returns range.start() if x <= range.start(), returns range.end() if x >= range.end() and returns x elsewhen.
format_with_decimals_in_range
format_with_minimum_decimals
lerp	Linear interpolation.
pos2	pos2(x,y) == Pos2::new(x, y)
remap	Linearly remap a value from one range to another, so that when x == from.start() returns to.start() and when x == from.end() returns to.end().
remap_clamp	Like remap, but also clamps the value so that the returned value is always in the to range.
round_to_decimals	Round a value to the given number of decimal places.
vec2	vec2(x,y) == Vec2::new(x, y)