| <!DOCTYPE html> |
| <!-- |
| Copyright (c) 2014 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. |
| --> |
| <link rel="import" href="/tracing/base/base.html"> |
| <link rel="import" href="/tracing/base/math/math.html"> |
| <link rel="import" href="/tracing/base/math/rect.html"> |
| |
| <script> |
| 'use strict'; |
| |
| /** |
| * @fileoverview 2D bounding box computations. |
| */ |
| tr.exportTo('tr.b.math', function() { |
| /** |
| * Tracks a 2D bounding box. |
| * @constructor |
| */ |
| function BBox2() { |
| this.isEmpty_ = true; |
| this.min_ = undefined; |
| this.max_ = undefined; |
| } |
| |
| BBox2.prototype = { |
| __proto__: Object.prototype, |
| |
| reset: function() { |
| this.isEmpty_ = true; |
| this.min_ = undefined; |
| this.max_ = undefined; |
| }, |
| |
| get isEmpty() { |
| return this.isEmpty_; |
| }, |
| |
| addBBox2: function(bbox2) { |
| if (bbox2.isEmpty) |
| return; |
| this.addVec2(bbox2.min_); |
| this.addVec2(bbox2.max_); |
| }, |
| |
| clone: function() { |
| var bbox = new BBox2(); |
| bbox.addBBox2(this); |
| return bbox; |
| }, |
| |
| /** |
| * Adds x, y to the range. |
| */ |
| addXY: function(x, y) { |
| if (this.isEmpty_) { |
| this.max_ = vec2.create(); |
| this.min_ = vec2.create(); |
| vec2.set(this.max_, x, y); |
| vec2.set(this.min_, x, y); |
| this.isEmpty_ = false; |
| return; |
| } |
| this.max_[0] = Math.max(this.max_[0], x); |
| this.max_[1] = Math.max(this.max_[1], y); |
| this.min_[0] = Math.min(this.min_[0], x); |
| this.min_[1] = Math.min(this.min_[1], y); |
| }, |
| |
| /** |
| * Adds value_x, value_y in the form [value_x,value_y] to the range. |
| */ |
| addVec2: function(value) { |
| if (this.isEmpty_) { |
| this.max_ = vec2.create(); |
| this.min_ = vec2.create(); |
| vec2.set(this.max_, value[0], value[1]); |
| vec2.set(this.min_, value[0], value[1]); |
| this.isEmpty_ = false; |
| return; |
| } |
| this.max_[0] = Math.max(this.max_[0], value[0]); |
| this.max_[1] = Math.max(this.max_[1], value[1]); |
| this.min_[0] = Math.min(this.min_[0], value[0]); |
| this.min_[1] = Math.min(this.min_[1], value[1]); |
| }, |
| |
| addQuad: function(quad) { |
| this.addVec2(quad.p1); |
| this.addVec2(quad.p2); |
| this.addVec2(quad.p3); |
| this.addVec2(quad.p4); |
| }, |
| |
| get minVec2() { |
| if (this.isEmpty_) |
| return undefined; |
| return this.min_; |
| }, |
| |
| get maxVec2() { |
| if (this.isEmpty_) |
| return undefined; |
| return this.max_; |
| }, |
| |
| get sizeAsVec2() { |
| if (this.isEmpty_) |
| throw new Error('Empty BBox2 has no size'); |
| var size = vec2.create(); |
| vec2.subtract(size, this.max_, this.min_); |
| return size; |
| }, |
| |
| get size() { |
| if (this.isEmpty_) |
| throw new Error('Empty BBox2 has no size'); |
| return {width: this.max_[0] - this.min_[0], |
| height: this.max_[1] - this.min_[1]}; |
| }, |
| |
| get width() { |
| if (this.isEmpty_) |
| throw new Error('Empty BBox2 has no width'); |
| return this.max_[0] - this.min_[0]; |
| }, |
| |
| get height() { |
| if (this.isEmpty_) |
| throw new Error('Empty BBox2 has no width'); |
| return this.max_[1] - this.min_[1]; |
| }, |
| |
| toString: function() { |
| if (this.isEmpty_) |
| return 'empty'; |
| return 'min=(' + this.min_[0] + ',' + this.min_[1] + ') ' + |
| 'max=(' + this.max_[0] + ',' + this.max_[1] + ')'; |
| }, |
| |
| asRect: function() { |
| return tr.b.math.Rect.fromXYWH( |
| this.min_[0], |
| this.min_[1], |
| this.max_[0] - this.min_[0], |
| this.max_[1] - this.min_[1]); |
| } |
| }; |
| |
| return { |
| BBox2, |
| }; |
| }); |
| </script> |
