Module coord

Coordinate system abstractions.

Coordinate systems can be attached to drawing areas. By doing so, the drawing area can draw elements in the guest coordinate system. DrawingArea::apply_coord_spec is used to attach new coordinate system to the drawing area.

CoordTranslate is the trait required by DrawingArea::apply_coord_spec. It provides the forward coordinate translation: from the logic coordinate to the pixel-based absolute backend coordinate system.

When the coordinate type implements ReverseCoordTranslate, the backward translation is possible, which allows mapping pixel-based coordinate into the logic coordinate. It’s not usually used for static figure rendering, but may be useful for a interactive figure.

RangedCoord is the 2D cartesian coordinate system that has two Ranged axis. A ranged axis can be logarithmic and by applying an logarithmic axis, the figure is logarithmic scale. Also, the ranged axis can be decereted, and this is required by the histogram series.

Structs

LogCoord

A log scaled coordinate axis

LogRange

The wrapper type for a range of a log-scaled value

RangedCoord

The coordinate described by two ranged value

RangedCoordf32

The ranged coordinate for type f32

RangedCoordf64

The ranged coordinate for type f64

RangedCoordi32

The ranged coordinate for type i32

RangedCoordi64

The ranged coordinate for type i64

RangedCoordu32

The ranged coordinate for type u32

RangedCoordu64

The ranged coordinate for type u64

RangedDate

The ranged coordinate for date

RangedDateTime

The ranged coordinate for the date and time

Shift

The coordinate translation that only impose shift

ShiftAndTrans

We can compose an abitray transformation with a shift

Enums

MeshLine

Represent a coordinate mesh for the two ranged value coordinate system

Traits

AsRangedCoord

The trait for the type that can be converted into a ranged coordinate axis

CoordTranslate

The trait that translates some customized object to the backend coordinate

DescreteRanged

The trait indicates the coordinate is descrete, so that we can draw histogram on it

LogScalable

The trait for the type that is able to be presented in the log scale

Ranged

The trait that indicates we have a ordered and ranged value Which is used to describe the axis

ReversableRanged

The trait indicates the ranged value can be map reversely, which means an pixel-based cooridinate is given, it’s possible to figureout the underlying logic value.

ReverseCoordTranslate

The trait indicates that the coordinate system supports reverse transform This is useful when we need an interactive plot, thus we need to map the event from the backend coordinate to the logical coordinate