Version: v0.0.0-...-e0f5769 Latest Latest Go to latest
Published: Mar 1, 2023 License: BSD-3-Clause

## Documentation ¶

### Overview ¶

Package geom defines a two-dimensional coordinate system.

The coordinate system is based on an left-handed Cartesian plane. That is, X increases to the right and Y increases down. For (x,y),

```(0,0) → (1,0)
↓   ↘
(0,1)   (1,1)
```

The display window places the origin (0, 0) in the upper-left corner of the screen. Positions on the plane are measured in typographic points, 1/72 of an inch, which is represented by the Pt type.

Any interface that draws to the screen using types from the geom package scales the number of pixels to maintain a Pt as 1/72 of an inch.

### Constants ¶

This section is empty.

### Variables ¶

This section is empty.

### Functions ¶

This section is empty.

### Types ¶

#### type Point ¶

```type Point struct {
X, Y Pt
}```

Point is a point in a two-dimensional plane.

#### func (Point) String ¶

`func (p Point) String() string`

String returns a string representation of p like "(1.2,3.4)".

#### type Pt ¶

`type Pt float32`

Pt is a length.

The unit Pt is a typographical point, 1/72 of an inch (0.3527 mm).

It can be be converted to a length in current device pixels by multiplying with PixelsPerPt after app initialization is complete.

#### func (Pt) Px ¶

`func (p Pt) Px(pixelsPerPt float32) float32`

Px converts the length to current device pixels.

#### func (Pt) String ¶

`func (p Pt) String() string`

String returns a string representation of p like "3.2pt".

#### type Rectangle ¶

```type Rectangle struct {
Min, Max Point
}```

A Rectangle is region of points. The top-left point is Min, and the bottom-right point is Max.

#### func (Rectangle) String ¶

`func (r Rectangle) String() string`

String returns a string representation of r like "(3,4)-(6,5)".