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window.rect = (function(){
var FRONT = 0x1, BACK = 0x2, LEFT = 0x4, RIGHT = 0x8
var rect = function (x0,y0,x1,y1){
if (x0 instanceof vec2) {
this.x = x0
this.y = y0
}
else if (x1 === undefined) {
this.x = new vec2(x0,x0)
this.y = new vec2(y0,y0)
}
else {
this.x = new vec2(x0,x1)
this.y = new vec2(y0,y1)
}
this.translation = new vec2(0,0)
this.sides = FRONT | BACK | LEFT | RIGHT
this.focused = false
this.id = 0
}
rect.prototype.clone = function(){
return new rect( this.x.clone(), this.y.clone() )
}
rect.prototype.center = function(){
return new vec2(this.x.midpoint(), this.y.midpoint())
}
rect.prototype.area = function(){
return this.x.length() * this.y.length()
}
rect.prototype.normalize = function(){
this.x.abs().add(this.translation.a)
this.y.abs().add(this.translation.b)
this.translation.a = this.translation.b = 0
return this
}
rect.prototype.contains = function(x,y){
return this.x.contains(x) && this.y.contains(y)
}
rect.prototype.intersects = function(r){
return this.x.intersects(r.x) && this.y.intersects(r.y)
}
rect.prototype.width = function(){ return this.x.length() }
rect.prototype.height = function(){ return this.y.length() }
rect.prototype.fill = function(){
// if (! this.sides) return this
ctx.fillRect(this.x.a + this.translation.a, this.y.a + this.translation.b, this.x.length(), this.y.length())
return this
}
rect.prototype.stroke_sides = function(){
if (this.sides & FRONT) line(this.x.a, this.y.a, this.x.b, this.y.a)
if (this.sides & BACK) line(this.x.a, this.y.b, this.x.b, this.y.b)
if (this.sides & LEFT) line(this.x.a, this.y.a, this.x.a, this.y.b)
if (this.sides & RIGHT) line(this.x.b, this.y.a, this.x.b, this.y.b)
function line(a,b,c,d){
ctx.beginPath()
ctx.moveTo(a,b)
ctx.lineTo(c,d)
ctx.stroke()
}
return this
}
rect.prototype.stroke = function(){
ctx.beginPath()
ctx.moveTo(this.x.a, this.y.a)
ctx.lineTo(this.x.b, this.y.b)
ctx.stroke()
return this
}
rect.prototype.perimeter = function(){
line( this.x.a, this.y.a, this.x.b, this.y.a, this.translation )
line( this.x.a, this.y.b, this.x.b, this.y.b, this.translation )
line( this.x.a, this.y.a, this.x.a, this.y.b, this.translation )
line( this.x.b, this.y.a, this.x.b, this.y.b, this.translation )
}
rect.prototype.toString = function(){
var sides = ""
if (this.sides & FRONT) sides += "front "
if (this.sides & BACK) sides += "back "
if (this.sides & LEFT) sides += "left "
if (this.sides & RIGHT) sides += "right "
var s = this.id + " " + "[" + this.x.toString() + " " + this.y.toString() + "] " + sides
if (this.focused) return "<b>" + s + "</b>"
return s
}
rect.prototype.quantize = function(n){
this.x.quantize(n)
this.y.quantize(n)
}
rect.prototype.reset = function(){
var copy = this.clone()
copy.sides = FRONT | BACK | LEFT | RIGHT
copy.focused = this.focused
copy.id = this.id
this.regions = [ copy ]
}
rect.prototype.clipTo = function(r){
// for each of this rect's regions split the region if necessary
var regions = this.regions
var splits
for (var i = 0, len = regions.length; i < len; i++) {
if (regions[i] && regions[i].intersects(r)) {
splits = regions[i].split(r)
regions = regions.concat(splits)
regions[i] = null
}
}
this.regions = regions
}
rect.prototype.split = function(r){
var rz = this
var splits = []
var split_contains = 0
var x_intervals = [], y_intervals = []
var sides = this.sides
// Split vertically
if (this.x.contains(r.x.a) && r.x.contains(this.x.b)) {
x_intervals.push([ new vec2( this.x.a, r.x.a ), LEFT ])
x_intervals.push([ new vec2( r.x.a, this.x.b ), RIGHT ])
split_contains |= RIGHT
}
else if (r.x.contains(this.x.a) && this.x.contains(r.x.b)) {
x_intervals.push([ new vec2( this.x.a, r.x.b ), LEFT ])
x_intervals.push([ new vec2( r.x.b, this.x.b ), RIGHT ])
split_contains |= LEFT
}
else if (this.x.contains(r.x.a) && this.x.contains(r.x.b)) {
x_intervals.push([ new vec2( this.x.a, r.x.a ), LEFT ])
x_intervals.push([ new vec2( r.x.a, r.x.b ), 0 ])
x_intervals.push([ new vec2( r.x.b, this.x.b ), RIGHT ])
split_contains |= LEFT | RIGHT
}
else { // if (r.x.contains(this.x.a) && r.x.contains(r.x.b)) {
x_intervals.push([ new vec2( this.x.a, this.x.b ), LEFT | RIGHT ])
split_contains |= LEFT | RIGHT
}
// Split horizontally
if (this.y.contains(r.y.a) && r.y.contains(this.y.b)) {
y_intervals.push([ new vec2( this.y.a, r.y.a ), FRONT ])
y_intervals.push([ new vec2( r.y.a, this.y.b ), BACK ])
split_contains |= BACK
}
else if (r.y.contains(this.y.a) && this.y.contains(r.y.b)) {
y_intervals.push([ new vec2( this.y.a, r.y.b ), FRONT ])
y_intervals.push([ new vec2( r.y.b, this.y.b ), BACK ])
split_contains |= FRONT
}
else if (this.y.contains(r.y.a) && this.y.contains(r.y.b)) {
y_intervals.push([ new vec2( this.y.a, r.y.a ), FRONT ])
y_intervals.push([ new vec2( r.y.a, r.y.b ), 0 ])
y_intervals.push([ new vec2( r.y.b, this.y.b ), BACK ])
split_contains |= FRONT | BACK
}
else { // if (r.y.contains(this.y.a) && this.y.contains(r.y.b)) {
y_intervals.push([ new vec2( this.y.a, this.y.b ), FRONT | BACK ])
split_contains |= FRONT | BACK
}
x_intervals.forEach(function(x){
y_intervals.forEach(function(y){
var rn = new rect(x[0], y[0])
rn.id = rz.id
rn.sides = ((x[1] | y[1]) & sides)
if (r.intersects(rn)) {
rn.sides = 0
}
rn.focused = rz.focused
splits.push(rn)
})
})
return splits
}
return rect
})()
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