nimble

package
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 Go to latest Published: Feb 17, 2020 License: Apache-2.0 Imports: 12 Imported by: 0

README

Nimble

Go package for simple 2D video games.

See doc.go for details.

Documentation

Overview

nimble is a Go package for simple 2D video games.

It's a Go incarnation of a lightweight graphics interface that I use for video games. The games typically involve unusual rendering not handled by hardware accelerators. Hence the interface focuses on providing simple efficient access to bitmaps in memory.

The other purpose of the package is be a thin wrapper that can be wrapped around a variety of host platforms. The initial port is against go-sdl2 (https://github.com/veandco/go-sdl2).

When used for production, it should be built with `-tags=release`.

Index

Constants

View Source 
const (
	Black = Pixel(0xFF000000)
	White = Pixel(0xFFFFFFFF)
)

Predefined pixel constants.

View Source 
const (
	KeyBackspace = Key(8)
	KeyTab       = Key(9)
	KeyReturn    = Key(0xD)
	KeyEscape    = Key(0x1B)
	KeyDelete    = Key(0x7F)
	KeyLeft      = Key(0x11 + iota) // Borrow "device control" codes
	KeyRight
	KeyUp
	KeyDown
)

Key values for non-printing keys.

View Source 
const (
	MouseMove = MouseEvent(iota) // Mouse moved with button up
	MouseDown                    // Button pressed
	MouseUp                      // Button released
	MouseDrag                    // Mouse moved with button down
)

Kinds of mouse events.

View Source 
const SampleRate = 44100.0

Nominal sample rate for waveforms.

Variables

This section is empty.

Functions

func AddKeyObserver 

func AddKeyObserver(k KeyObserver)

AddKeyObserver causes KeyObserver k to be notified of key events.

func AddMouseObserver 

func AddMouseObserver(m MouseObserver)

AddMouseObserver causes m to be notified of mouse events.

func AddRenderClient 

func AddRenderClient(r renderClient)

func CreateRecordFile 

func CreateRecordFile(filename string) (file *os.File, err error)

func MouseState 

func MouseState() (x, y int32, isDown bool)

Get state of mouse.

func Now 

func Now() float64

Get time in seconds. Time zero is platform specific.

func OpenRecordFile 

func OpenRecordFile(filename string) (*os.File, error)

func PlaySound 

func PlaySound(waveform []float32, relativeAmplitude, relativePitch float32)

Play a sound using the given waveform samples.

func Quit 

func Quit()

Quit causes Run() to return after processing any pending events.

func Run 

func Run(win WindowSpec) int

win==nil requests a full-screen window

func ShowCursor 

func ShowCursor(show bool)

ShowCursor causes the cursor to be shown or hidden.

Types

type Font 

type Font ttf.Font

A Font

func OpenFont 

func OpenFont(filename string, size int) (*Font, error)

OpenFont opens creates a font object and returns a pointer to it.

func (Font) Close 

func (f Font) Close()

Close frees resources used by the given Font object.

func (*Font) Height 

func (f *Font) Height() int32

Height returns the nominal height of the font.

func (*Font) Size 

func (f *Font) Size(text string) (width, height int32)

Size returns the width and height of a bounding box for the text.

type Key 

type Key uint8

A Key represents a key on the keyoard. Printable ASCII values represent themselves.

type KeyObserver 

type KeyObserver interface {
	KeyDown(Key)
}

A KeyObserver is notified of key events.

type MouseEvent 

type MouseEvent uint8

type MouseObserver 

type MouseObserver interface {
	ObserveMouse(event MouseEvent, x, y int32)
}

A MouseObserver observes mousse events.

type PixMap 

type PixMap struct {
	// contains filtered or unexported fields
}

A PixMap is a reference to a 2D array or subarray of pixels.

func MakePixMap 

func MakePixMap(width, height int32, pixels []Pixel, vstride int32) (pm PixMap)

MakePixMap makes a PixMap referring to pixels in the given slice. The following identities describe the mapping: 

pixels[0] maps to (0,0).
pixels[1] maps to (1,0).
pixels[vstride] to (0,1).

func ReadPixMap 

func ReadPixMap(filename string) (pm PixMap, err error)

ReadPixMap reads a PixMap from a file with the given name.

func (*PixMap) Contains 

func (pm *PixMap) Contains(x, y int32) bool

Contains returns true iff the PixMap contains pointer (x,y).

func (*PixMap) Copy 

func (dst *PixMap) Copy(x0, y0 int32, src *PixMap)

Copy copies PixMap src to dst, mapping (0,0) of src onto (x0,y0) of dst.

func (*PixMap) DrawRect 

func (pm *PixMap) DrawRect(r Rect, color Pixel)

DrawRect draws a rectangle with the given color.

func (*PixMap) DrawText 

func (pm *PixMap) DrawText(x, y int32, text string, color Pixel, font *Font) (width, height int32)

DrawText draws the given text at (x,y) on pm, in the given color and font. The return value indicates the width and height of a bounding box for the text.

func (*PixMap) Empty 

func (pm *PixMap) Empty() bool

Empty is true if the PixMap has zero pixels.

func (*PixMap) Fill 

func (pm *PixMap) Fill(color Pixel)

Fill fills the PixMap with the given color.

func (*PixMap) Height 

func (pm *PixMap) Height() int32

Height returns the height of the PixMap.

func (*PixMap) Intersect 

func (pm *PixMap) Intersect(r Rect) (result PixMap)

Intersect returns a PixMap referencing the pixels in the intersection of a PixMap and a Rect.

func (*PixMap) Pixel 

func (pm *PixMap) Pixel(x int32, y int32) Pixel

Pixel returns value of pixel at (x,y)

func (*PixMap) Row 

func (pm *PixMap) Row(y int32) []Pixel

Row returns a slice referring to the pixels with the given y coordinate. For example: 

pm.Row(y)[x]

refers to the same pixel as: 

pm.Pixel(x,y)

func (*PixMap) SetPixel 

func (pm *PixMap) SetPixel(x, y int32, color Pixel)

Set pixel at (x,y) to given color.

func (*PixMap) Size 

func (pm *PixMap) Size() (w, h int32)

Size returns the width and height of the PixMap

func (*PixMap) Width 

func (pm *PixMap) Width() int32

Width returns the width of the PixMap.

type Pixel 

type Pixel uint32

A pixel value. Currently the format is ARGB, but this might change in the future. Use the Pixel constructing functions RGB and Gray to construct pixels.

func Gray 

func Gray(frac float32) Pixel

Gray constructs a Pixel with equal red, green, and blue components. frac should be in the interval [0,1]

func PixelSliceFromByteSlice 

func PixelSliceFromByteSlice(data []byte, length int32) (pixels []Pixel)

Creates a slice of Pixel from a raw pointer

func RGB 

func RGB(red float32, green float32, blue float32) Pixel

RGB constructs a Pixel from its red, green, and blue components. Each component should be in the interval [0,1]

type Rect 

type Rect struct {
	Left, Top, Right, Bottom int32
}

A rectangle or bounding box. The bounds form the product of half-open intervals [Left,Right) x [Top,Bottom)

func MakeRect 

func MakeRect(x, y, width, height int32) (r Rect)

MakeRect makes a Rect given upper left corner (x,y) and its width and height

func (*Rect) Contains 

func (r *Rect) Contains(x, y int32) bool

Contains returns truee iff the Rect contains (x,y)

func (*Rect) Empty 

func (r *Rect) Empty() bool

Empty returns true iff rectangle is empty

func (*Rect) Height 

func (r *Rect) Height() int32

Height returns the height the Rect.

func (*Rect) RelativeToLeftTop 

func (r *Rect) RelativeToLeftTop(x, y int32) (xLocal, yLocal int32)

func (*Rect) Size 

func (r *Rect) Size() (w, h int32)

Size returns the width and height of the Rect.

func (*Rect) Width 

func (r *Rect) Width() int32

Width returns the width the Rect.

type WindowSpec 

type WindowSpec interface {
	Size() (width, height int32)
	Title() string
}

Source Files

View all Source files

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