/
spriteGenerator.go
86 lines (71 loc) · 2.07 KB
/
spriteGenerator.go
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package particle
import (
"github.com/200sc/go-dist/floatrange"
"github.com/oakmound/oak/v2/alg"
"github.com/oakmound/oak/v2/render"
)
// A SpriteGenerator generate SpriteParticles
type SpriteGenerator struct {
BaseGenerator
SpriteRotation floatrange.Range
Base *render.Sprite
}
// NewSpriteGenerator creates a SpriteGenerator
func NewSpriteGenerator(options ...func(Generator)) Generator {
g := new(SpriteGenerator)
g.setDefaults()
for _, opt := range options {
opt(g)
}
return g
}
func (sg *SpriteGenerator) setDefaults() {
sg.BaseGenerator.setDefaults()
sg.SpriteRotation = floatrange.Constant(0)
}
// Generate creates a source using this generator
func (sg *SpriteGenerator) Generate(layer int) *Source {
// Convert rotation from degrees to radians
if sg.Rotation != nil {
sg.Rotation = sg.Rotation.Mult(alg.DegToRad)
}
return NewSource(sg, layer)
}
// GenerateParticle creates a particle from a generator
func (sg *SpriteGenerator) GenerateParticle(bp *baseParticle) Particle {
return &SpriteParticle{
baseParticle: bp,
rotation: float32(sg.SpriteRotation.Poll()),
}
}
// A Sprited can have a sprite set to it
type Sprited interface {
SetSprite(*render.Sprite)
SetSpriteRotation(f floatrange.Range)
}
// Sprite sets a Sprited's sprite
func Sprite(s *render.Sprite) func(Generator) {
return func(g Generator) {
g.(Sprited).SetSprite(s)
}
}
// SetSprite is the function on a sprite generator that satisfies
// Sprited
func (sg *SpriteGenerator) SetSprite(s *render.Sprite) {
sg.Base = s
}
// SpriteRotation sets a Sprited's rotation
func SpriteRotation(f floatrange.Range) func(Generator) {
return func(g Generator) {
g.(Sprited).SetSpriteRotation(f)
}
}
// SetSpriteRotation satisfied Sprited for SpriteGenerators
func (sg *SpriteGenerator) SetSpriteRotation(f floatrange.Range) {
sg.SpriteRotation = f
}
// GetParticleSize returns the size of the sprite that the generator generates
func (sg *SpriteGenerator) GetParticleSize() (float64, float64, bool) {
bounds := sg.Base.GetRGBA().Rect.Max
return float64(bounds.X), float64(bounds.Y), false
}