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// A Polyline is a set of points inputted by the user using the V2 editor to trace a blueprint.
// Additionally, it manages a set of MX objects which correspond to the walls in 3D.
// In this way, it attempts to bridge the 2D (canvas, imperative) and 3D (css, declarative) views.
var Polyline = Fiber.extend(function(base){
var exports = {}
exports.init = function(){
this.points = []
this.mx_points = []
this.closed = false
}
exports.add = function(p){
this.points.push( p )
this.mx_points.push( new MX.Point(p) )
}
exports.firstPoint = function(){
return this.points[0]
}
exports.lastPoint = function(){
return this.points[this.points.length-1]
}
exports.canCloseWith = function(p){
return (this.points.length > 2 && this.points[0].distanceTo( p ) < 10/map.zoom)
}
exports.getHeadAtIndex = function(index){
if (index == 0) { return null }
if (index == this.points.length-1) { return this.clone() }
var head = new Polyline()
head.points = this.points.slice(0, index+1)
return head
}
exports.getTailAtIndex = function(index){
if (index == this.points.length-1) { return null }
if (index == 0) { return this.clone() }
var tail = new Polyline()
tail.points = this.points.slice(index, this.points.length)
return tail
}
exports.clone = function(){
var clone = new Polyline()
clone.points = this.points.concat()
}
exports.hasPointNear = function(p){
var point
for (var i = 0; i < this.points.length; i++){
point = this.points[i]
if (point.distanceTo( p ) < 10/map.zoom) {
return point
}
}
return null
}
exports.hasEndPointNear = function(p){
if (this.closed || ! this.points.length) return null
if (this.firstPoint().distanceTo( p ) < 10/map.zoom) {
return this.firstPoint()
}
if (this.lastPoint().distanceTo( p ) < 10/map.zoom) {
return this.lastPoint()
}
return null
}
exports.hasSegmentNear = function(p, min_dist){
var p1, p2, d1, d2, sum, rat
var dx, dy, new_x, new_y, x, y, closest_distance = min_dist || Infinity
var closest_i = -1
var points = this.points
var p1, p2 = points[0]
for (var i = 1; i < points.length; i++) {
p1 = p2
p2 = points[i]
d1 = p2.a - p1.a
d2 = p2.b - p1.b
sum = d1*d1 + d2*d2
rat = ((p.a - p1.a) * d1 + (p.b - p1.b) * d2) / sum
rat = rat < 0 ? 0 : rat < 1 ? rat : 1
new_x = p1.a + rat * d1
new_y = p1.b + rat * d2
dx = new_x - p.a
dy = new_y - p.b
sum2 = sqrt(dx*dx+dy*dy)
if (sum2 < closest_distance) {
x = new_x
y = new_y
closest_distance = sum2
closest_i = i
}
}
if (closest_i == -1) return null
return {
x: x,
y: y,
distance: closest_distance,
head: closest_i-1,
tail: closest_i,
}
}
exports.draw = function(ctx){
var points = this.points
if (! points.length) return
if (points.length == 1) {
ctx.fillStyle = "#f80"
map.draw.dot_at(this.points[0].a, points[0].b, 5)
}
if (points.length > 1) {
ctx.fillStyle = "rgba(255,255,0,0.1)"
ctx.strokeStyle = "#f80"
ctx.lineWidth = 2 / map.zoom
ctx.beginPath()
ctx.moveTo(points[0].a, points[0].b)
points.forEach(function(point, i){
i && ctx.lineTo(point.a, point.b)
})
ctx.stroke()
if (! map.ui.placing || this.closed) {
ctx.fill()
}
}
}
exports.draw_line = function (ctx, p){
var last = this.points[this.points.length-1]
ctx.strokeStyle = "#f80"
ctx.lineWidth = 2 / map.zoom
ctx.beginPath()
ctx.moveTo(last.a, last.b)
ctx.lineTo(p.a, p.b)
ctx.stroke()
}
exports.close = function(){
this.points[this.points.length] = this.points[0]
this.closed = true
}
exports.build = function(){
this.mx_points && this.mx_points.forEach(function(mx){ scene.remove(mx) })
this.mx = new MX.Polyline(this)
}
exports.rebuild = function(){
this.mx.rebuild()
}
exports.getSegments = function(){
if (this.points.length == 1) {
return []
}
var segments = []
for (var i = 1; i < this.points.length; i++) {
segments.push( [ this.points[i-1], this.points[i] ] )
}
return segments
}
exports.serialize = function(){
return this.points.map(function(point){ return [point.a, point.b] })
}
exports.deserialize = function(points){
this.points = points.map(function(point){ return new vec2(point[0], point[1]) })
}
exports.reset = function(){
this.mx_points.forEach(function(mx){ scene.remove(mx) })
this.mx_points.length = 0
this.points.length = 0
}
exports.destroy = function(){
this.reset()
this.mx && this.mx.destroy()
}
return exports
})
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