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(function(){
var vec2, Rect
if ('window' in this) {
vec2 = window.vec2
Rect = window.Rect
}
else {
vec2 = require('./vec2')
Rect = require('./rect')
}
var Surface = function (face){
this.bounds = new Rect (new vec2(0, 0), new vec2(0, 0))
this.faces = []
if (face) {
this.add(face)
}
}
Surface.prototype.add = function(rect){
if (this.faces.length == 0) {
this.bounds.x.a = rect.x.a
this.bounds.x.b = rect.x.a
this.bounds.y.a = rect.y.a
this.bounds.y.b = rect.y.a
}
this.bounds.x.b += rect.width()
this.bounds.y.b = Math.max(this.bounds.y.b, rect.height())
this.faces.push(rect)
}
Surface.prototype.fits_scale = function(v, scale){
v = v.clone().mul(scale)
return this.fits(v)
}
Surface.prototype.fits = function(v){
var faces = this.faces
var scratch
if (this.bounds.x.b < v.a || this.bounds.y.b < v.b) {
return null
}
for (var i = 0; i < faces.length; i++) {
if (faces[i].fits(v)) {
return faces[i]
}
}
scratch = new Rect (0,0,0,0)
for (var i = 0; i < faces.length; i++) {
if (faces[i].y.length() < v.b) {
continue
}
scratch.x.a = faces[i].x.a
scratch.x.b = faces[i].x.b
scratch.y.a = faces[i].y.a
scratch.y.b = faces[i].y.b
SEARCH: for (var j = i+1; j < faces.length; j++) {
if (faces[j].y.a > scratch.y.a) {
scratch.y.a = faces[j].y.a
}
if (faces[j].y.b < scratch.y.b) {
scratch.y.b = faces[j].y.b
}
if (scratch.y.b <= scratch.y.a || scratch.y.length() < v.b) {
break SEARCH
}
scratch.x.b = faces[j].x.b
if (scratch.fits(v)) {
return scratch
}
}
}
return null
}
Surface.prototype.place = function(v, index){
var face, faces = this.faces
}
function center (dimension, position) {
return new vec2( position.a + dimension.a/2, position.b + dimension.b/2 )
}
function edges (dimension, position) {
return new Rect( position.a, position.a + dimension.a,
position.b, position.b + dimension.b )
}
Surface.prototype.clamp_delta = function (bounds, dimension, position, delta) {
var left_edge = position.a + delta.a - bounds.x.a
if (left_edge < 0) {
delta.a -= left_edge
}
var right_edge = position.a + dimension.a + delta.a - bounds.x.b
if (right_edge > 0) {
delta.a -= right_edge
}
var bottom_edge = position.b + delta.b + bounds.y.a
if (bottom_edge < 0) {
delta.b -= bottom_edge
}
var top_edge = position.b + dimension.b + delta.b - bounds.y.b
if (top_edge > 0) {
delta.b -= top_edge
}
}
Surface.prototype.fit = function (old_bounds, dimension, position, delta) {
// to reposition one of these fucking things
// assume it's already in a valid position
this.clamp_delta( this.bounds, dimension, position, delta )
// if it's moved and it's within the current bounds, we're done
// it's outside the general bounds, do an initial clamp
// given the center, find the element it wants to lie on
// if it's too short for this element, look to the (left? right? compare dx) for the first element tall enough for it
// move the (right? left?) edge to whatever div that is and move the center
// find the elements containing the left and right edges, and any in between
//
}
Surface.prototype.index_for_x = function(x){
if (x < 0 || x > width) {
return -1
}
for (var i = 0; i < this.faces.length; i++) {
if (this.faces[i].x.contains(x)) {
return i
}
}
return -1
}
Surface.prototype.bounds_at_index = function(index){
var bounds = faces[index].clone()
var height = faces[index].height()
bounds.first = bounds.last = index
for (var i = index-1; i >= 0; i--) {
var face = faces[i]
if (face.y.length() < height) {
continue
}
if (face.y.a > bounds.y.a) {
continue
}
if (face.y.b < bounds.y.b) {
continue
}
bounds.x.a = bounds.x.a
bounds.first = i
}
for (var i = index+1; i < faces.length; i++) {
var face = faces[i]
if (face.y.length() < height) {
continue
}
if (face.y.a > bounds.y.a) {
continue
}
if (face.y.b < bounds.y.b) {
continue
}
bounds.x.b = bounds.x.b
bounds.last = i
}
return bounds
}
Surface.prototype.clamp = function (bounds, dimension, position, dx, dy) {
// we start out with a set of boundaries where we know the object should fall
// we then check if we've moved the box off any edge of the bounds
// if so, check if the new position is valid with respect to the surface.
// for horizontal movement, this means checking the height and boundaries of
// faces with adjacent indexes
var p = position.clone(), nextIndex, nextFace, newBounds
p.a += dx
p.b += dy
// left edge
if (p.a < bounds.x.a) {
if (bounds.first == 0) {
p.a = bounds.x.a
}
else {
nextIndex = bounds.first - 1
nextFace = this.faces[nextIndex]
if (nextFace.y.a <= p.b && p.b + dimension.b <= nextFace.y.b) {
// it appears the div to the left will accomodate this element
}
else {
p.a = bounds.x.a
}
}
}
// right edge
else if (p.a + dimension.a > bounds.x.b) {
if (bounds.last == this.faces.length-1) {
p.a = bounds.x.b - dimension.a
}
else {
nextIndex = bounds.last + 1
nextFace = this.faces[nextIndex]
if (nextFace.y.a <= p.b && p.b + dimension.b <= nextFace.y.b) {
// it appears the div to the right will accomodate this element
}
else {
p.a = bounds.x.b - dimension.a
}
}
}
// for vertical movement, this means checking the height and boundaries of
// elements in the set of bounds' indexes
if (p.b < bounds.y.a) {
for (var i = Math.min(nextIndex, bounds.first), last = Math.max(nextIndex, bounds.last); i < last; i++) {
face = this.faces[i]
// loop over each of the faces in the list
// given a face, figure out if the new top-left is in its bounds
// if so, find which one contains its right edge
// get the lowest height of this set
// then clamp to that lowest height
// additionally, this is the new center-index
// recalculate the bounds
// if (face.x.b < p.
// for (var j = bounds.first+1; j < bounds.last
}
}
// bottom edge, so we can clamp here trivially
else if (p.b + dimension.b > bounds.y.b) {
p.b = bounds.y.b - dimension.b
}
// if we're able to move out of bounds in that direction, recalculate the bounds
}
if ('window' in this) {
window.Surface = Surface
}
else {
module.exports = Surface
}
})()
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