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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
'use strict';
/**
* @fileoverview 2D Rectangle math.
*/
base.require('base.gl_matrix');
base.exportTo('base', function() {
/**
* Tracks a 2D bounding box.
* @constructor
*/
function Rect() {
this.x = 0;
this.y = 0;
this.width = 0;
this.height = 0;
};
Rect.fromXYWH = function(x, y, w, h) {
var rect = new Rect();
rect.x = x;
rect.y = y;
rect.width = w;
rect.height = h;
return rect;
}
Rect.fromArray = function(ary) {
if (ary.length != 4)
throw new Error('ary.length must be 4');
var rect = new Rect();
rect.x = ary[0];
rect.y = ary[1];
rect.width = ary[2];
rect.height = ary[3];
return rect;
}
Rect.prototype = {
__proto__: Object.prototype,
get left() {
return this.x;
},
get top() {
return this.y;
},
get right() {
return this.x + this.width;
},
get bottom() {
return this.y + this.height;
},
toString: function() {
return 'Rect(' + this.x + ', ' + this.y + ', ' +
this.width + ', ' + this.height + ')';
},
toArray: function() {
return [this.x, this.y, this.width, this.height];
},
clone: function() {
var rect = new Rect();
rect.x = this.x;
rect.y = this.y;
rect.width = this.width;
rect.height = this.height;
return rect;
},
enlarge: function(pad) {
var rect = new Rect();
this.enlargeFast(rect, pad);
return rect;
},
enlargeFast: function(out, pad) {
out.x = this.x - pad;
out.y = this.y - pad;
out.width = this.width + 2 * pad;
out.height = this.height + 2 * pad;
return out;
},
size: function() {
return {width: this.width, height: this.height};
},
scale: function(s) {
var rect = new Rect();
this.scaleFast(rect, s);
return rect;
},
scaleSize: function(s) {
return Rect.fromXYWH(this.x, this.y, this.width * s, this.height * s);
},
scaleFast: function(out, s) {
out.x = this.x * s;
out.y = this.y * s;
out.width = this.width * s;
out.height = this.height * s;
return out;
},
translate: function(v) {
var rect = new Rect();
this.translateFast(rect, v);
return rect;
},
translateFast: function(out, v) {
out.x = this.x + v[0];
out.y = this.x + v[1];
out.width = this.width;
out.height = this.height;
return out;
},
asUVRectInside: function(containingRect) {
var rect = new Rect();
rect.x = (this.x - containingRect.x) / containingRect.width;
rect.y = (this.y - containingRect.y) / containingRect.height;
rect.width = this.width / containingRect.width;
rect.height = this.height / containingRect.height;
return rect;
},
intersects: function(that) {
var ok = true;
ok &= this.x < that.right;
ok &= this.right > that.x;
ok &= this.y < that.bottom;
ok &= this.bottom > that.y;
return ok;
},
equalTo: function(rect) {
return rect &&
(this.x === rect.x) &&
(this.y === rect.y) &&
(this.width === rect.width) &&
(this.height === rect.height);
}
};
return {
Rect: Rect
};
});
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