render

package
v1.2.0 Latest Latest
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 Go to latest Published: Aug 5, 2017 License: Apache-2.0 Imports: 33 Imported by: 0

Documentation

Overview

Package render provides several types of renderable entities which are used throughout the code base

In addition to entities the package also provides utilities to load images from files and load images from parts of files (subsprites such as is used in sprite sheets) as well as draw them.

Renderable package has both simple entites and more complex entites that build off them. There is the Sprite that supports being loaded and drawn in a location, and on the other end of the spectrum there is the Animation that can control how it draws sprite sheet sub components.

Package render provides several types of renderable entities, methods for loading images from file, and methods for drawing those entities to screen.

Index

Constants

View Source 
const (
	// FpsSmoothing is how much of the fps of the upcoming frame is used
	// relative to the previous fps total when calculating the fps at a given
	// frame
	FpsSmoothing = .25
)
View Source 
const (
	// Undraw is a constant used to undraw elements
	Undraw = -1000
)

Variables

View Source 
var (
	//HorizontalProgress measures progress as x / w
	HorizontalProgress = func(x, y, w, h int) float64 {
		return float64(x) / float64(w)
	}
	//VerticalProgress measures progress as y / h
	VerticalProgress = func(x, y, w, h int) float64 {
		return float64(y) / float64(h)
	}
	//CircularProgress measures progress as distance from the center of a circle.
	CircularProgress = func(x, y, w, h int) float64 {
		xRadius := float64(w) / 2
		yRadius := float64(h) / 2
		dX := math.Abs(float64(x) - xRadius)
		dY := math.Abs(float64(y) - yRadius)
		progress := math.Pow(dX/xRadius, 2) + math.Pow(dY/yRadius, 2)
		if progress > 1 {
			progress = 1
		}
		return progress
	}
)

Progress functions

View Source 
var (

	// DefFontGenerator is a default font generator of no options
	DefFontGenerator = FontGenerator{}
)
View Source 
var (
	// GlobalDrawStack is the stack that all draw calls are parsed through.
	GlobalDrawStack = &DrawStack{
		as: []Addable{NewHeap(false)},
	}
)

Functions

func BatchLoad 

func BatchLoad(baseFolder string) error

BatchLoad loads subdirectories from the given base folder and imports all files, using alias rules to automatically determine the size of sprites and sheets in subfolders. A folder named 16x8 will have its images split into sheets where each sprite is 16x8, for example. 16 is a shorter way of writing 16x16. An alias.json file can be included that can indicate what dimensions named folders represent, so a "tiles": "32" field in the json would indicate that sprite sheets in the /tiles folder should be read as 32x32

func BoundingRect 

func BoundingRect(points []physics.Vector) (MinX, MinY, MaxX, MaxY float64, w, h int)

BoundingRect converts a set of points into their minimum bounding rectangle

func DrawForTime 

func DrawForTime(r Renderable, l int, t time.Duration)

DrawForTime is a wrapper for Draw and UndrawAfter

func DrawLineOnto 

func DrawLineOnto(rgba *image.RGBA, x1, y1, x2, y2 int, c color.Color)

DrawLineOnto draws a line onto an image rgba from one point to another Todo: this and drawLineBetween should be combined to reduce duplicate code

func DrawPolygonDim 

func DrawPolygonDim() (int, int, int, int)

DrawPolygonDim returns the dimensions of the draw polygon, or all zeroes if there is none.

func DrawThickLine added in v1.1.0 

func DrawThickLine(rgba *image.RGBA, x1, y1, x2, y2 int, c color.Color, thickness int)

DrawThickLine acts like DrawlineOnto, but takes in thickness of the given line

func FlipX 

func FlipX(rgba image.Image) *image.RGBA

FlipX returns a new rgba which is flipped over the horizontal axis.

func FlipY 

func FlipY(rgba *image.RGBA) *image.RGBA

FlipY returns a new rgba which is flipped over the vertical axis.

func FontColor 

func FontColor(s string) image.Image

FontColor converts a small set of strings to colors TODO: Implement a better version or pull in an outside library already doing this as this should be a fairly common utility function

func GetSheet 

func GetSheet(fileName string) [][]*Sprite

GetSheet tries to find the given file in the set of loaded sheets. If it fails, it will panic unhelpfully. Todo: fix this If it succeeds, it will return the sheet (a 2d array of sprites)

func InDrawPolygon 

func InDrawPolygon(xi, yi, x2i, y2i int) bool

InDrawPolygon returns whehter a coordinate and dimension set should be drawn given the draw polygon

func LoadFont 

func LoadFont(dir string, fontFile string) *truetype.Font

LoadFont loads in a font file and stores it with the given name. This is necessary before using the fonttype for a Font

func PreDraw 

func PreDraw()

PreDraw tries to reset the GlobalDrawStack or performs the GlobalDrawStack's predraw functions

func ReplaceDraw 

func ReplaceDraw(r1, r2 Renderable, stackLayer, layer int)

ReplaceDraw will undraw r1 and draw r2 after the next draw frame Useful for not working

func ResetDrawStack 

func ResetDrawStack()

ResetDrawStack resets the Global stack back to the initial stack

func SetDrawPolygon 

func SetDrawPolygon(p clip.Polygon)

SetDrawPolygon sets the draw polygon and flags that draw functions should check for containment in the polygon before running

func SetDrawStack 

func SetDrawStack(as ...Addable)

SetDrawStack takes in a set of Addables which act as the set of Drawstacks available

func SetFontDefaults 

func SetFontDefaults(wd, assetPath, fontPath, hinting, color, file string, size, dpi float64)

SetFontDefaults updates the default font parameters with the passed in arguments

func ShinyDraw 

func ShinyDraw(buff draw.Image, img image.Image, x, y int)

ShinyDraw performs a draw operation at -x, -y, because shiny/screen represents quadrant 4 as negative in both axes. draw.Over will merge two pixels at a given position based on their alpha channel.

func ShinyOverwrite 

func ShinyOverwrite(buff draw.Image, img image.Image, x, y int)

ShinyOverwrite is equivalent to ShinyDraw, but uses draw.Src draw.Src will overwrite pixels beneath the given image regardless of the new image's alpha.

func ShinySet 

func ShinySet(buff draw.Image, c color.Color, x, y int)

ShinySet sets on a buffer at -x, -y

func Tween 

func Tween(start image.Image, end image.Image, frames int) []*image.RGBA

Tween takes two images and returns a set of images tweening between the two over some number of frames

func UndrawAfter 

func UndrawAfter(r Renderable, t time.Duration)

UndrawAfter will trigger a renderable's undraw function after a given time has passed

func UpdateDebugMap 

func UpdateDebugMap(rName string, r Renderable)

UpdateDebugMap stores a renderable under a name in a package global map. this is used by some built in debugConsole helper functions.

Types

type Addable 

type Addable interface {
	PreDraw()
	Add(Renderable, int) Renderable
	Replace(Renderable, Renderable, int)
	Copy() Addable
	// contains filtered or unexported methods
}

An Addable manages Renderables

type Animation 

type Animation struct {
	LayeredPoint

	Interruptable bool
	// contains filtered or unexported fields
}

Animation takes a set of frames and provides a framework for animating them

func LoadAnimation 

func LoadAnimation(sheet *Sheet, w, h, pad int, fps float64, frames []int) (*Animation, error)

LoadAnimation takes in a sheet with sheet dimensions, a frame rate and a list of frames where frames are in x,y pairs ([0,0,1,0,2,0] for (0,0) (1,0) (2,0)) and returns an animation from that

func LoadSheetAnimation 

func LoadSheetAnimation(fileName string, w, h, pad int, fps float64, frames []int) (*Animation, error)

LoadSheetAnimation loads a sheet and then calls LoadAnimation on that sheet

func NewAnimation 

func NewAnimation(sheetP *Sheet, fps float64, frames []int) (*Animation, error)

NewAnimation creates an Animation

func (*Animation) Copy 

func (a *Animation) Copy() Modifiable

Copy creates a new Modifiable that is a copy of the current animation.

func (*Animation) Draw 

func (a *Animation) Draw(buff draw.Image)

Draw draws the animation at its logical location

func (*Animation) DrawOffset 

func (a *Animation) DrawOffset(buff draw.Image, xOff, yOff float64)

DrawOffset draws the animation with some x,y offset from its logical location

func (*Animation) GetDims 

func (a *Animation) GetDims() (int, int)

GetDims returns the dimensions of the animation in terms of x, y

func (*Animation) GetRGBA 

func (a *Animation) GetRGBA() *image.RGBA

GetRGBA returns the current frames rgba

func (*Animation) IsStatic added in v1.0.3 

func (a *Animation) IsStatic() bool

IsStatic returns false for animations

func (*Animation) Modify 

func (a *Animation) Modify(ms ...Modification) Modifiable

Modify applies a set of modifications to the Animation

func (*Animation) Pause 

func (p *Animation) Pause()

func (*Animation) SetTriggerID 

func (a *Animation) SetTriggerID(id event.CID)

SetTriggerID sets animation's id to the passed in id.

func (*Animation) Unpause 

func (p *Animation) Unpause()

type CanPause added in v1.0.3 

type CanPause interface {
	Pause()
	Unpause()
}

CanPause types have pause functions to start and stop animation

type Composite 

type Composite struct {
	LayeredPoint
	// contains filtered or unexported fields
}

Composite Types, distinct from Compound Types, Display all of their parts at the same time, and respect the positions and layers of their parts.

func NewComposite 

func NewComposite(sl []Modifiable) *Composite

NewComposite creates a Composite

func (*Composite) Add 

func (cs *Composite) Add(i int, r Modifiable)

Add places a renderable at a certain point in the composites renderable slice

func (*Composite) AddOffset 

func (cs *Composite) AddOffset(i int, v physics.Vector)

AddOffset offsets all renderables in the composite by a vector

func (*Composite) AlwaysDirty 

func (cs *Composite) AlwaysDirty() bool

AlwaysDirty shows that the Composite always needs updating

func (*Composite) Append 

func (cs *Composite) Append(r Modifiable)

Append adds a renderable as is to the composite

func (*Composite) AppendOffset 

func (cs *Composite) AppendOffset(r Modifiable, v physics.Vector)

AppendOffset adds a new offset modifiable to the composite

func (*Composite) Copy 

func (cs *Composite) Copy() Modifiable

Copy makes a new Composite with the same renderables

func (*Composite) Draw 

func (cs *Composite) Draw(buff draw.Image)

Draw draws the Composite at its logical position

func (*Composite) DrawOffset 

func (cs *Composite) DrawOffset(buff draw.Image, xOff, yOff float64)

DrawOffset draws the Composite with some offset from its logical position (and therefore sub renderables logical positions).

func (*Composite) Get 

func (cs *Composite) Get(i int) Modifiable

Get returns a renderable at the given index within the composite

func (*Composite) GetRGBA 

func (cs *Composite) GetRGBA() *image.RGBA

GetRGBA does not work on a composite and therefore returns nil

func (*Composite) Modify 

func (cs *Composite) Modify(ms ...Modification) Modifiable

Modify applies modifications to the composite

func (*Composite) SetOffsets 

func (cs *Composite) SetOffsets(vs []physics.Vector)

SetOffsets applies the initial offsets to the entire Composite

func (*Composite) String 

func (cs *Composite) String() string

func (*Composite) UnDraw 

func (cs *Composite) UnDraw()

UnDraw stops the composite from being drawn

type CompositeR 

type CompositeR struct {
	LayeredPoint
	// contains filtered or unexported fields
}

CompositeR keeps track of a set of renderables at a location

func NewCompositeR 

func NewCompositeR(sl []Renderable) *CompositeR

NewCompositeR creates a new CompositeR from a slice of renderables

func (*CompositeR) Add 

func (cs *CompositeR) Add(r Renderable, i int) Renderable

Add stages a renderable to be added to CompositeR at a give position in the slice

func (*CompositeR) AddOffset 

func (cs *CompositeR) AddOffset(i int, v physics.Vector)

AddOffset adds an offset to a given renderable of the slice

func (*CompositeR) AlwaysDirty 

func (cs *CompositeR) AlwaysDirty() bool

AlwaysDirty notes that CompositeR is alwaysdirty

func (*CompositeR) Append 

func (cs *CompositeR) Append(r Renderable)

Append adds a new renderable to CompositeR

func (*CompositeR) AppendOffset 

func (cs *CompositeR) AppendOffset(r Renderable, v physics.Vector)

AppendOffset adds a new renderable to CompositeR with an offset

func (*CompositeR) Copy 

func (cs *CompositeR) Copy() Addable

Copy returns a new composite with the same length slice of renderables but no actual renderables... CompositeRs cannot have their internal elements copied, as renderables cannot be copied.

func (*CompositeR) Draw 

func (cs *CompositeR) Draw(buff draw.Image)

Draw draws the CompositeR at its logical location and therefore its consituent renderables as well

func (*CompositeR) DrawOffset 

func (cs *CompositeR) DrawOffset(buff draw.Image, xOff, yOff float64)

DrawOffset Draws the CompositeR with an offset from its logical location.

func (*CompositeR) Get 

func (cs *CompositeR) Get(i int) Renderable

Get returns renderable at given location in CompositeR

func (*CompositeR) GetRGBA 

func (cs *CompositeR) GetRGBA() *image.RGBA

GetRGBA does not work on composites and returns nil

func (*CompositeR) PreDraw 

func (cs *CompositeR) PreDraw()

PreDraw updates the CompositeR with the new renderables to add. This helps keep consistency and mitigates the threat of unsafe operations.

func (*CompositeR) Replace 

func (cs *CompositeR) Replace(r1, r2 Renderable, i int)

Replace updates a renderable in the CompositeR to the new Renderable

func (*CompositeR) SetOffsets 

func (cs *CompositeR) SetOffsets(ps []physics.Vector)

SetOffsets sets all renderables in CompositeR to the passed in Vector positions positions

func (*CompositeR) String 

func (cs *CompositeR) String() string

func (*CompositeR) UnDraw 

func (cs *CompositeR) UnDraw()

UnDraw undraws the CompositeR and therefore its consituent renderables as well

type Compound 

type Compound struct {
	LayeredPoint
	// contains filtered or unexported fields
}

The Compound type is intended for use to easily swap between multiple renderables that are drawn at the same position on the same layer. A common use case for this would be a character entitiy who switches their animation based on how they are moving or what they are doing.

The Compound type removes the need to repeatedly draw and undraw elements of a character, which has a tendency to leave nothing drawn for a draw frame.

func NewCompound 

func NewCompound(start string, m map[string]Modifiable) *Compound

NewCompound creates a new compound from a map of names to modifiables

func (*Compound) Add 

func (c *Compound) Add(k string, v Modifiable) (err error)

Add makes a new entry in the Compounds map

func (*Compound) Copy 

func (c *Compound) Copy() Modifiable

Copy creates a copy of the Compound

func (*Compound) Draw 

func (c *Compound) Draw(buff draw.Image)

Draw draws the Compound at its logical location

func (*Compound) DrawOffset 

func (c *Compound) DrawOffset(buff draw.Image, xOff float64, yOff float64)

DrawOffset draws the Compound at an offset from its logical location

func (*Compound) Get 

func (c *Compound) Get() string

Get returns the Compound's current key

func (*Compound) GetDims 

func (c *Compound) GetDims() (int, int)

GetDims gets the current Renderables dimensions

func (*Compound) GetRGBA 

func (c *Compound) GetRGBA() *image.RGBA

GetRGBA returns the current renderables rgba

func (*Compound) GetSub 

func (c *Compound) GetSub(s string) Modifiable

GetSub returns a keyed Modifiable from this compound's map

func (*Compound) IsInterruptable 

func (c *Compound) IsInterruptable() bool

IsInterruptable returns whether the current renderable is interruptable

func (*Compound) IsStatic 

func (c *Compound) IsStatic() bool

IsStatic returns whether the current renderable is static

func (*Compound) Modify 

func (c *Compound) Modify(ms ...Modification) Modifiable

Modify performs a series of modifications on the Compound

func (*Compound) Pause 

func (c *Compound) Pause()

Pause stops the current Renderable if possible

func (*Compound) Revert 

func (c *Compound) Revert(mod int)

Revert will revert all parts of this compound that can be reverted

func (*Compound) RevertAll 

func (c *Compound) RevertAll()

RevertAll will revert all parts of this compound that can be reverted, back to their original state.

func (*Compound) Set 

func (c *Compound) Set(k string) error

Set sets the current renderable to the one specified

func (*Compound) SetOffsets 

func (c *Compound) SetOffsets(k string, offsets physics.Vector)

SetOffsets sets the logical offset for the specified key

func (*Compound) ShiftPos 

func (c *Compound) ShiftPos(x, y float64)

ShiftPos shifts the Compounds logical position

func (*Compound) Unpause 

func (c *Compound) Unpause()

Unpause tries to unpause the current Renderable if possible

type DrawFPS 

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

DrawFPS is a draw stack element that will draw the fps onto the screen

func NewDrawFPS 

func NewDrawFPS() *DrawFPS

NewDrawFPS returns a zero-initialized DrawFPS

func (*DrawFPS) Add 

func (df *DrawFPS) Add(Renderable, int) Renderable

Add does nothing for a drawFPS

func (*DrawFPS) Copy 

func (df *DrawFPS) Copy() Addable

Copy does effectively nothing for a drawFPS

func (*DrawFPS) PreDraw 

func (df *DrawFPS) PreDraw()

PreDraw does nothing for a drawFPS

func (*DrawFPS) Replace 

func (df *DrawFPS) Replace(Renderable, Renderable, int)

Replace does nothing for a drawFPS

type DrawStack 

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

The DrawStack is a stack with a safe adding mechanism that creates isolation between draw steps via predraw

func (*DrawStack) Copy 

func (ds *DrawStack) Copy() *DrawStack

Copy creates a new deep copy of a Drawstack

func (*DrawStack) Draw 

func (ds *DrawStack) Draw(world draw.Image, view image.Point, w, h int)

Draw actively draws the onto the actual screen

func (*DrawStack) Pop 

func (ds *DrawStack) Pop()

Pop increments the pop counter

func (*DrawStack) PreDraw 

func (ds *DrawStack) PreDraw()

PreDraw takes care of popping and pushing onto the stack. This helps safegaurd against operations taking place in the middle of a draw

func (*DrawStack) Push 

func (ds *DrawStack) Push(a Addable)

Push appends an addable to the draw stack during the next predraw

type Font 

type Font struct {
	FontGenerator
	font.Drawer
}

A Font can both be generated and drawn

func DefFont 

func DefFont() *Font

DefFont returns the default font

func (*Font) Copy 

func (f *Font) Copy() *Font

Copy returns a new font from the given fonts generate function

func (*Font) NewIntText 

func (f *Font) NewIntText(str *int, x, y float64) *Text

NewIntText wraps the given int pointer in a stringer interface

func (*Font) NewStrText 

func (f *Font) NewStrText(str string, x, y float64) *Text

NewStrText is a helper to take in a string instead of a stringer for NewText

func (*Font) NewText 

func (f *Font) NewText(str fmt.Stringer, x, y float64) *Text

NewText takes in anything that has a String() function and returns a text object with the associated font and screen position

func (*Font) Refresh 

func (f *Font) Refresh()

Refresh regenerates the font per its generator's parameters

func (*Font) Reset 

func (f *Font) Reset()

Reset sets the font to being a default font

type FontGenerator 

type FontGenerator struct {
	File    string
	Color   image.Image
	Size    float64
	Hinting string
	DPI     float64
}

A FontGenerator stores a set of information that can be used to create a font

func (*FontGenerator) Copy 

func (fg *FontGenerator) Copy() *FontGenerator

Copy cretaes a copy of the FontGenerator

func (*FontGenerator) Generate 

func (fg *FontGenerator) Generate() *Font

Generate creates a font from the FontGenerator

type FontManager 

type FontManager map[string]*Font

A FontManager is just a map for fonts that contains a default font

func NewFontManager 

func NewFontManager() *FontManager

NewFontManager returns a FontManager where 'def' is the default font

func (*FontManager) Get 

func (fm *FontManager) Get(name string) *Font

Get retrieves a font from a manager

func (*FontManager) NewFont 

func (fm *FontManager) NewFont(name string, fg FontGenerator) error

NewFont adds to the font manager and potentially returns if the key was already defined in the map

type Layered 

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

A Layered object is one with a layer

func (*Layered) GetLayer 

func (ld *Layered) GetLayer() int

GetLayer returns the layer of an object if it has one or else returns that the object needs to be undrawn

func (*Layered) SetLayer 

func (ld *Layered) SetLayer(l int)

SetLayer sets an object that has a layer to the given layer

func (*Layered) UnDraw 

func (ld *Layered) UnDraw()

UnDraw sets that a layered object should be undrawn

type LayeredPoint 

type LayeredPoint struct {
	physics.Vector
	Layered
}

A LayeredPoint is an object with a position Vector and a layer

func NewLayeredPoint 

func NewLayeredPoint(x, y float64, l int) LayeredPoint

NewLayeredPoint creates a new LayeredPoint at a given location and layer

func (*LayeredPoint) Copy 

func (ldp *LayeredPoint) Copy() LayeredPoint

Copy deep copies the LayeredPoint

func (*LayeredPoint) GetDims 

func (ldp *LayeredPoint) GetDims() (int, int)

GetDims returns a static small amount so that polygon containment does not throw errors

func (*LayeredPoint) GetLayer 

func (ldp *LayeredPoint) GetLayer() int

GetLayer returns the layer of this point. If this is nil, it will return Undraw

func (*LayeredPoint) SetPos 

func (ldp *LayeredPoint) SetPos(x, y float64)

SetPos sets the LayeredPoint's position to the given x, y

func (*LayeredPoint) ShiftX 

func (ldp *LayeredPoint) ShiftX(x float64)

ShiftX moves the LayeredPoint by the given x

func (*LayeredPoint) ShiftY 

func (ldp *LayeredPoint) ShiftY(y float64)

ShiftY moves the LayeredPoint by the given y

func (*LayeredPoint) String 

func (ldp *LayeredPoint) String() string

type LogicFPS 

type LogicFPS struct {
	event.CID
	// contains filtered or unexported fields
}

LogicFPS is a draw stack element that will draw the logical fps onto the screen

func NewLogicFPS 

func NewLogicFPS() *LogicFPS

NewLogicFPS returns a zero-initialized LogicFPS

func (*LogicFPS) Add 

func (lf *LogicFPS) Add(Renderable, int) Renderable

Add does nothing for a drawFPS

func (*LogicFPS) Copy 

func (lf *LogicFPS) Copy() Addable

Copy does effectively nothing for a drawFPS

func (*LogicFPS) Init 

func (lf *LogicFPS) Init() event.CID

Init satisfies event.Entity

func (*LogicFPS) PreDraw 

func (lf *LogicFPS) PreDraw()

PreDraw does nothing for a drawFPS

func (*LogicFPS) Replace 

func (lf *LogicFPS) Replace(Renderable, Renderable, int)

Replace does nothing for a drawFPS

type Modifiable 

type Modifiable interface {
	Renderable
	GetRGBA() *image.RGBA
	Modify(...Modification) Modifiable
	Copy() Modifiable
}

A Modifiable is a Renderable that has functions to change its underlying image. This may be replaced with the gift library down the line

func EmptyRenderable 

func EmptyRenderable() Modifiable

EmptyRenderable returns a minimal, 1-width and height psuedo-nil Renderable (and Modifiable)

type Modification 

type Modification func(image.Image) *image.RGBA

A Modification takes in an image buffer and returns a new image buffer

func And 

func And(ms ...Modification) Modification

And chains together multiple Modifications into a single Modification

func ApplyColor 

func ApplyColor(c color.Color) Modification

ApplyColor mixes a color into the rgba values of an image and returns that new rgba.

func ApplyMask 

func ApplyMask(img image.RGBA) Modification

ApplyMask mixes the rgba values of two images, according to their alpha levels, and returns that as a new rgba.

func Brighten 

func Brighten(brightenBy float32) Modification

Brighten brightens an image

func ColorBalance 

func ColorBalance(r, g, b float32) Modification

ColorBalance takes in 3 numbers between -100 and 500 and applies it to the given image

func Cut 

func Cut(newWidth, newHeight int) Modification

Cut reduces (or increases, adding nothing) the dimensions of the input image, setting them to newWidth and newHeight. (Consider: use generic int modifiers here so we don't need CutRel and Cut? i.e a function header like Cut(wMod, hMod func(int) int)? )

func CutRel 

func CutRel(relWidth, relHeight float64) Modification

CutRel acts like Cut, but takes in a multiplier on the existing dimensions of the image.

func CutRound 

func CutRound(xOff, yOff float64) Modification

CutRound rounds the edges of the Modifiable with Bezier curves. Todo: A nice bezier curve toolset would be nice

func Fade 

func Fade(alpha int) Modification

Fade reduces the alpha of an image

func FillMask 

func FillMask(img image.RGBA) Modification

FillMask replaces alpha 0 pixels in an RGBA with corresponding pixels in a second RGBA.

func Rotate 

func Rotate(degrees int) Modification

Rotate returns a rotated rgba.

func Scale 

func Scale(xRatio, yRatio float64) Modification

Scale returns a scaled rgba.

type NonInterruptable added in v1.0.3 

type NonInterruptable interface {
	IsInterruptable() bool
}

NonInterruptable types are not always interruptable. If something is not NonInterruptable, it is equivalent to having IsInterruptable always return true.

type NonStatic added in v1.0.3 

type NonStatic interface {
	IsStatic() bool
}

NonStatic types are not always static. If something is not NonStatic, it is equivalent to having IsStatic always return true.

type Polygon 

type Polygon struct {
	*Sprite
	Rect
	// contains filtered or unexported fields
}

A Polygon is a renderable that is represented by a set of in order points on a plane.

func NewPolygon 

func NewPolygon(points []physics.Vector) (*Polygon, error)

NewPolygon takes in a set of points and returns a polygon. If less than three points are provided, this fails.

func ScreenPolygon 

func ScreenPolygon(points []physics.Vector, w, h int) (*Polygon, error)

ScreenPolygon returns a polygon on the screen, used for draw polygons.

func (*Polygon) Contains 

func (pg *Polygon) Contains(x, y float64) (contains bool)

Contains returns whether or not the current Polygon contains the passed in Point. It is the default containment function, versus wrapping and convex.

func (*Polygon) ConvexContains 

func (pg *Polygon) ConvexContains(x, y float64) bool

ConvexContains returns whether the given point is contained by the input polygon. It assumes the polygon is convex. It outperforms the alternatives.

func (*Polygon) Fill 

func (pg *Polygon) Fill(c color.Color)

Fill fills the inside of this polygon with the input color

func (*Polygon) FillInverse 

func (pg *Polygon) FillInverse(c color.Color)

FillInverse colors this polygon's exterior the given color

func (*Polygon) GetOutline 

func (pg *Polygon) GetOutline(c color.Color) *Composite

GetOutline returns a set of lines of the given color along this polygon's outline

func (*Polygon) UpdatePoints 

func (pg *Polygon) UpdatePoints(points []physics.Vector)

UpdatePoints resets the points of this polygon to be the passed in points

func (*Polygon) WrappingContains 

func (pg *Polygon) WrappingContains(x, y float64) bool

WrappingContains returns whether the given point is contained by the input polygon.

type Rect 

type Rect struct {
	MinX, MaxX, MinY, MaxY float64
}

A Rect is a helper type storing X1,Y1,X2,Y2 in floats

type Renderable 

type Renderable interface {
	// As the engine currently exists,
	// the buffer which is passed into draw
	// is always the same. This leads to
	// several parts of the engine being
	// reliant on shiny/screen when they
	// could call out to somewhere else to
	// determine what they are drawn onto.
	//
	// On the other hand, this allows manually
	// duplicating renderables onto multiple
	// buffers, but in certain implementations
	// (i.e Animation) would have unintended
	// consequences.
	Draw(buff draw.Image)
	DrawOffset(buff draw.Image, xOff, yOff float64)

	// Basic Implementing struct: Point
	ShiftX(x float64)
	GetX() float64
	ShiftY(y float64)
	GetY() float64
	SetPos(x, y float64)
	GetDims() (int, int)

	// Basic Implementing struct: Layered
	GetLayer() int
	SetLayer(l int)
	UnDraw()

	// Utilities
	String() string

	// Physics
	// Basic Implementing struct: physics.Vector
	physics.Attachable
}

A Renderable is anything which can be drawn at a given draw layer, undrawn, and set in a particular position.

Basic Implementing struct: Sprite

func Draw 

func Draw(r Renderable, l int) (Renderable, error)

Draw accesses the global draw stack

func DrawColor 

func DrawColor(c color.Color, x1, y1, x2, y2 float64, layer, stackLayer int) Renderable

DrawColor is equivalent to LoadSpriteAndDraw, but with colorboxes.

func GetDebugRenderable 

func GetDebugRenderable(rName string) (Renderable, bool)

GetDebugRenderable returns whatever renderable is stored under the input string, if any.

func LoadSpriteAndDraw 

func LoadSpriteAndDraw(filename string, l int) (Renderable, error)

LoadSpriteAndDraw is shorthand for LoadSprite followed by Draw.

type RenderableHeap 

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

The RenderableHeap type is set up to manage a set of renderables to prevent any unsafe operations and allow for distinct updates between draw cycles

func NewHeap 

func NewHeap(static bool) *RenderableHeap

NewHeap creates a new renderableHeap

func (*RenderableHeap) Add 

func (rh *RenderableHeap) Add(r Renderable, layer int) Renderable

Add stages a new Renderable to add to the heap

func (*RenderableHeap) Copy 

func (rh *RenderableHeap) Copy() Addable

Copy on a renderableHeap does not include any of its elements, as renderables cannot be copied.

func (*RenderableHeap) Len 

func (rh *RenderableHeap) Len() int

Satisfying the Heap interface Len gets the length of the current heap

func (*RenderableHeap) Less 

func (rh *RenderableHeap) Less(i, j int) bool

Less returns whether a renderable at index i is at a lower layer than the one at index j

func (*RenderableHeap) Pop 

func (rh *RenderableHeap) Pop() interface{}

Pop pops from the heap

func (*RenderableHeap) PreDraw 

func (rh *RenderableHeap) PreDraw()

PreDraw parses through renderables to be pushed and adds them to the drawheap.

func (*RenderableHeap) Push 

func (rh *RenderableHeap) Push(r interface{})

Push adds to the renderable heap

func (*RenderableHeap) Replace 

func (rh *RenderableHeap) Replace(r1, r2 Renderable, layer int)

Replace adds a Renderable and removes an old one

func (*RenderableHeap) Swap 

func (rh *RenderableHeap) Swap(i, j int)

Swap moves two locations

type Reverting 

type Reverting struct {
	Modifiable
	// contains filtered or unexported fields
}

The Reverting structure lets modifications be made to a Modifiable and then reverted, up to arbitrary history limits.

func NewReverting 

func NewReverting(m Modifiable) *Reverting

NewReverting returns a Reverting type wrapped around the given modifiable

func (*Reverting) Copy 

func (rv *Reverting) Copy() Modifiable

Copy returns a copy of this Reverting

func (*Reverting) IsInterruptable 

func (rv *Reverting) IsInterruptable() bool

IsInterruptable returns if whatever this reverting is currently dispalying is interruptable.

func (*Reverting) IsStatic 

func (rv *Reverting) IsStatic() bool

IsStatic returns if whatever this reverting is currently displaying is static.

func (*Reverting) Modify 

func (rv *Reverting) Modify(ms ...Modification) Modifiable

Modify alters this reverting by the given modifications, appending the new modified renderable to it's list of modified versions and displaying it.

func (*Reverting) Pause 

func (rv *Reverting) Pause()

Pause ceases animating any renderable types that animate underneath this

func (*Reverting) Revert 

func (rv *Reverting) Revert(n int)

Revert goes back n steps in this Reverting's history and displays that Modifiable

func (*Reverting) RevertAll 

func (rv *Reverting) RevertAll()

RevertAll resets this reverting to its original Modifiable

func (*Reverting) RevertAndModify 

func (rv *Reverting) RevertAndModify(n int, ms ...Modification) Modifiable

RevertAndModify reverts n steps and then modifies this reverting. This is a separate function from Revert followed by Modify to prevent skipped draw frames.

func (*Reverting) Set 

func (rv *Reverting) Set(k string)

Set calls Set on underlying types below this Reverting that cat be Set Todo: if Set becomes used by more types, this should use an interface like CanPause

func (*Reverting) Unpause 

func (rv *Reverting) Unpause()

Unpause resumes animating any renderable types that animate underneath this

type ScrollBox 

type ScrollBox struct {
	*Sprite

	Rs []Renderable

	View physics.Vector
	// contains filtered or unexported fields
}

A ScrollBox is a renderable that draws other renderables to itself in a scrolling fashion, for animating ticker tape feeds or rotating background animations.

func NewScrollBox 

func NewScrollBox(rs []Renderable, milliPerPixelX, milliPerPixelY, width, height int) *ScrollBox

NewScrollBox returns a ScrollBox of the input renderables and the given dimensions. milliPerPixel represents the number of milliseconds it will take for the scroll box to move a horizontal or vertical pixel respectively. A negative value for milliPerPixel will move in a negative direction.

func (*ScrollBox) AddRenderable 

func (s *ScrollBox) AddRenderable(rs ...Renderable)

AddRenderable adds the inputs to this scrollbox.

func (*ScrollBox) Draw 

func (s *ScrollBox) Draw(buff draw.Image)

Draw draws this scroll box to the input buffer

func (*ScrollBox) DrawOffset 

func (s *ScrollBox) DrawOffset(buff draw.Image, xOff, yOff float64)

DrawOffset draws this scroll box at +xOff, +yOff

func (*ScrollBox) Pause 

func (p *ScrollBox) Pause()

func (*ScrollBox) SetReappearPos 

func (s *ScrollBox) SetReappearPos(x, y float64) error

SetReappearPos sets at what point renderables in this box should loop back on themselves to begin scrolling again

func (*ScrollBox) SetScrollRate 

func (s *ScrollBox) SetScrollRate(milliPerPixelX, milliPerPixelY int)

SetScrollRate sets how fast this scroll box should rotate its x and y axes Maybe BUG, Consider: The next time that the box will scroll at is not updated immediately after this is called, only after the box is drawn.

func (*ScrollBox) Unpause 

func (s *ScrollBox) Unpause()

Unpause resumes this scroll box's scrolling. Will delay the next scroll frame if already unpaused.

type Sequence 

type Sequence struct {
	LayeredPoint

	Interruptable bool
	// contains filtered or unexported fields
}

A Sequence is a series of modifiables drawn as an animation. It is more primitive than animation, but less efficient.

func NewNoiseSequence 

func NewNoiseSequence(w, h, frames int, fps float64) *Sequence

NewNoiseSequence returns a sequence of noise boxes

func NewSequence 

func NewSequence(mods []Modifiable, fps float64) *Sequence

NewSequence returns a new sequence from the input modifiables, playing at fps rate

func TweenSequence 

func TweenSequence(a, b image.Image, frames int, fps float64) *Sequence

TweenSequence returns a sequence that is the tweening between the input images at the given frame rate over the given frame count.

func (*Sequence) Copy 

func (sq *Sequence) Copy() Modifiable

Copy copies each modifiable inside this sequence in order to produce a new copied sequence

func (*Sequence) Draw 

func (sq *Sequence) Draw(buff draw.Image)

Draw draws this sequence to the input buffer

func (*Sequence) DrawOffset 

func (sq *Sequence) DrawOffset(buff draw.Image, xOff, yOff float64)

DrawOffset draws this sequence at +xOff, +yOff

func (*Sequence) Get 

func (sq *Sequence) Get(i int) Modifiable

Get returns the Modifiable stored at this sequence's ith index. If the sequence does not have an ith index this panics todo: don't panic, return an error

func (*Sequence) GetRGBA 

func (sq *Sequence) GetRGBA() *image.RGBA

GetRGBA returns the RGBA of the currently showing frame of this sequence

func (*Sequence) IsStatic added in v1.0.3 

func (sq *Sequence) IsStatic() bool

IsStatic returns false for sequences

func (*Sequence) Modify 

func (sq *Sequence) Modify(ms ...Modification) Modifiable

Modify alters each renderable in this sequence by the given modifications

func (*Sequence) Pause 

func (p *Sequence) Pause()

func (*Sequence) SetTriggerID 

func (sq *Sequence) SetTriggerID(id event.CID)

SetTriggerID sets the ID that AnimationEnd will be triggered on when this sequence loops over from its last frame to its first

func (*Sequence) Unpause 

func (p *Sequence) Unpause()

type Sheet 

type Sheet [][]*image.RGBA

Sheet is a 2D array of image rgbas

func LoadSheet 

func LoadSheet(directory, fileName string, w, h, pad int) (*Sheet, error)

LoadSheet loads a file in some directory with sheets of (w,h) sized sprites, where there is pad pixels of vertical/horizontal pad between each sprite

func (*Sheet) SubSprite 

func (sh *Sheet) SubSprite(x, y int) *Sprite

SubSprite gets a sprite from a sheet at the given location

type Sprite 

type Sprite struct {
	LayeredPoint
	// contains filtered or unexported fields
}

A Sprite is a basic wrapper around image data and a point. The most basic Renderable.

func LoadSprite 

func LoadSprite(fileName string) *Sprite

LoadSprite loads the input fileName into a Sprite

func NewCircularGradientBox 

func NewCircularGradientBox(w, h int, startColor, endColor color.Color) *Sprite

NewCircularGradientBox returns a gradient box where the center will be startColor and the gradient will radiate as a circle out from the center.

func NewColorBox 

func NewColorBox(w, h int, c color.Color) *Sprite

NewColorBox returns a Sprite full of a given color with the given dimensions

func NewEmptySprite 

func NewEmptySprite(x, y float64, w, h int) *Sprite

NewEmptySprite returns a sprite of the given dimensions with a blank RGBA

func NewGradientBox 

func NewGradientBox(w, h int, startColor, endColor color.Color, pFunction progressFunction) *Sprite

NewGradientBox returns a gradient box defined on the two input colors and the given progress function

func NewHorizontalGradientBox 

func NewHorizontalGradientBox(w, h int, startColor, endColor color.Color) *Sprite

NewHorizontalGradientBox returns a gradient box with a horizontal gradient from the start to end color, left to right.

func NewLine 

func NewLine(x1, y1, x2, y2 float64, c color.Color) *Sprite

NewLine returns a line from x1,y1 to x2,y2 with the given color

func NewNoiseBox 

func NewNoiseBox(w, h int) *Sprite

NewNoiseBox returns a box of noise

func NewSeededNoiseBox 

func NewSeededNoiseBox(w, h int, seed int64) *Sprite

NewSeededNoiseBox returns a box of noise seeded at a specific value this previously used a complex noise function, but this refused to run on windows 32bit and was overkill, so it now uses math/rand

func NewSprite 

func NewSprite(x, y float64, r *image.RGBA) *Sprite

NewSprite creates a new sprite

func NewThickLine 

func NewThickLine(x1, y1, x2, y2 float64, c color.Color, thickness int) *Sprite

NewThickLine returns a Line that has some value of thickness

func NewVerticalGradientBox 

func NewVerticalGradientBox(w, h int, startColor, endColor color.Color) *Sprite

NewVerticalGradientBox returns a gradient box with a vertical gradient from the start to end color, top to bottom.

func OverlaySprites 

func OverlaySprites(sps []Sprite) *Sprite

OverlaySprites combines sprites together through masking to form a single sprite

func ParseSubSprite 

func ParseSubSprite(sheet string, x, y, w, h, pad int) *Sprite

ParseSubSprite pulls a sprite from a loaded sheet

func (*Sprite) Copy 

func (s *Sprite) Copy() Modifiable

Copy returns a copy of this Sprite

func (*Sprite) Draw 

func (s *Sprite) Draw(buff draw.Image)

Draw draws this sprite onto the input buffer

func (*Sprite) DrawOffset 

func (s *Sprite) DrawOffset(buff draw.Image, xOff, yOff float64)

DrawOffset draws this sprite at +xOff, +yOff

func (*Sprite) GetDims 

func (s *Sprite) GetDims() (int, int)

GetDims returns the dimensions of this sprite, or if this sprite has no defined RGBA returns default values. BUG: The reason the default values of 6,6 are returned is to cover a bug in the library we are using for polygon intersection. Too small objects will always be considered to intersect a draw polygon.

func (*Sprite) GetRGBA 

func (s *Sprite) GetRGBA() *image.RGBA

GetRGBA returns the rgba behind this sprite

func (*Sprite) IsNil 

func (s *Sprite) IsNil() bool

IsNil returns whether or not this sprite's rgba is nil.

func (*Sprite) Modify 

func (s *Sprite) Modify(ms ...Modification) Modifiable

Modify takes in modifications (modify.go) and alters this sprite accordingly

func (*Sprite) SetRGBA 

func (s *Sprite) SetRGBA(r *image.RGBA)

SetRGBA will replace the rgba behind this sprite

type Text 

type Text struct {
	LayeredPoint
	// contains filtered or unexported fields
}

A Text is a renderable that represents some text to print on screen

func (*Text) Center 

func (t *Text) Center()

Center will shift the text so that the existing leftmost point where the text sits becomes the center of the new text.

func (*Text) Draw 

func (t *Text) Draw(buff draw.Image)

Draw for a text draws the text at its layeredPoint position

func (*Text) DrawOffset 

func (t *Text) DrawOffset(buff draw.Image, xOff, yOff float64)

DrawOffset for a text object draws the text at t.(X,Y) + (xOff,yOff)

func (*Text) SetFont 

func (t *Text) SetFont(f *Font)

SetFont sets the drawer which renders the text each frame

func (*Text) SetInt 

func (t *Text) SetInt(i int)

SetInt takes and converts the input integer to a string to write

func (*Text) SetIntP 

func (t *Text) SetIntP(i *int)

SetIntP takes in an integer pointer that will be drawn at whatever the value is behind the pointer when it is drawn

func (*Text) SetString 

func (t *Text) SetString(str string)

SetString accepts a string itself as the stringer to be written

func (*Text) SetText 

func (t *Text) SetText(str fmt.Stringer)

SetText sets the string to be written to a new stringer

func (*Text) String 

func (t *Text) String() string

func (*Text) ToSprite added in v1.2.0 

func (t *Text) ToSprite() *Sprite

ToSprite converts this text into a sprite, so that it is no longer modifiable in terms of its text content, but is modifiable in terms of Modifications.

func (*Text) Wrap 

func (t *Text) Wrap(charLimit int, vertInc float64) []*Text

Wrap returns the input text split into a list of texts spread vertically, splitting after each charLimit is reached. the input vertInc is how much each text in the slice will differ by in y value

Source Files

View all Source files

Directories

Path Synopsis
Package particle provides options for generating renderable particle sources.
 Package particle provides options for generating renderable particle sources.

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