John Alanbrook
a85b1873dd
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108 lines
2.4 KiB
JavaScript
108 lines
2.4 KiB
JavaScript
/* Sprite façade (JS) ↔ struct sprite (C)
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* The C side exposes per-field getters/setters plus
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* `set_affine(m)` which (re)calculates the 2×2 matrix from
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* scale / skew / rotation.
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* We mirror every exposed field and make sure the C
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* matrix is refreshed whenever one of the three factors
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* changes.
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*/
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var sprite = {}
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var graphics = use('graphics')
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var render = use('render')
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var draw2d = use('draw2d')
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var SPRITE = Symbol() /* raw C sprite */
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var POS = Symbol() /* cached JS copies of simple data */
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var ROT = Symbol()
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var SCALE = Symbol()
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var SKEW = Symbol()
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var CENTER = Symbol()
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var COLOR = Symbol()
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var ursprite = {
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get pos() { return this[POS] },
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set pos(v) {
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this[POS] = v
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this[SPRITE].pos = v
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},
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get center() { return this[CENTER] },
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set center(v){
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this[CENTER] = v
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this[SPRITE].center = v
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},
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get rotation() { return this[ROT] },
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set rotation(t){
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this[ROT] = t
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this[SPRITE].rotation = t * 2*Math.PI /* C expects radians */
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this[SPRITE].set_affine()
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},
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get scale() { return this[SCALE] },
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set scale(v){
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this[SCALE] = v
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this[SPRITE].scale = v
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this[SPRITE].set_affine()
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},
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get skew() { return this[SKEW] },
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set skew(v){
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this[SKEW] = v
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this[SPRITE].skew = v
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this[SPRITE].set_affine()
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},
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get layer() { return this[SPRITE].layer },
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set layer(n){ this[SPRITE].layer = n },
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get color() { return this[COLOR] },
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set color(v){
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this[COLOR] = v
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this[SPRITE].color = v
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},
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move(mv){
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this.pos = {x:this.pos.x+mv.x, y:this.pos.y+mv.y}
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},
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moveto(p){
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this.pos = p
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}
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}
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var _sprites = []
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sprite.create = function(image, pos, anchor=[0,0], layer=0, props={}) {
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var sp = Object.create(ursprite)
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var raw = graphics.make_sprite()
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sp[SPRITE] = raw
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sp.pos = pos
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sp.rotation = 0
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sp.scale = [1,1]
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sp.skew = [0,0]
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sp.center = anchor
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sp.color = [1,1,1,1]
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var tex = graphics.texture(image)
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raw.set_image(tex)
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sp.image = tex
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sp.layer = layer
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sp.props = props
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sp.anchor = anchor
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_sprites.push(sp)
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return sp
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}
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sprite.forEach = fn => { for (let s of _sprites) fn(s) }
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sprite.values = () => _sprites.slice()
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sprite.geometry= () => graphics.make_sprite_mesh(_sprites)
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sprite.queue = () => graphics.make_sprite_queue(_sprites)
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return sprite
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