context

Documentation

Index

• Variables
• type C
  • func (c C) Draw(t ggl.Target, matrix mat.Mat, mask mat.RGBA)
  • func (c C) Fetch(t ggl.Target)
  • func (c *C) Init(parts ...PartDefs)
  • func (c C) Update(matrix mat.Mat, mask mat.RGBA)
• type Part
  • func (p *Part) TotalMask() mat.RGBA
  • func (p *Part) TotalOffset() mat.Vec
  • func (p *Part) TotalRotation() float64
• type PartDefs

Variables

var DefaultPartDefs = PartDefs{
	Scale: mat.V(1, 1),
	Mask:  rgba.White,
}

Types

type C

type C []Part

C helps you draw complex objects built from multiple sprites

func (C) Draw

func (c C) Draw(t ggl.Target, matrix mat.Mat, mask mat.RGBA)

Draw draws context to target with applied transform and mask

func (C) Fetch

func (c C) Fetch(t ggl.Target)

func (*C) Init

func (c *C) Init(parts ...PartDefs)

Init Initialized context with given Defaults. This can be called multiple times on same context and it will be restarted. C is mant to be reused to reduce allocations.

func (C) Update

func (c C) Update(matrix mat.Mat, mask mat.RGBA)

Update updates the sprite transform of context

type Part

type Part struct {
	Def           PartDefs
	Spr           ggl.Sprite
	Offset, Scale mat.Vec
	Mask          mat.RGBA
	Rotation      float64
}

Part is a building piece of context, if contains lot of configuration that is combined with Default configuration to make a final transformation and color

func (*Part) TotalMask

func (p *Part) TotalMask() mat.RGBA

TotalMask returns total mask of part, taking PartDefs into account

func (*Part) TotalOffset

func (p *Part) TotalOffset() mat.Vec

TotalOffset returns total offset of part, taking PartDefs into account

func (*Part) TotalRotation

func (p *Part) TotalRotation() float64

TotalRotation returns total rotation of part, taking PartDefs into account

type PartDefs

type PartDefs struct {
	Offset, Pivot, Scale mat.Vec
	Rotation             float64
	Mask                 mat.RGBA
	Region               mat.AABB
}

PartDefs stores the default values for Part