| <!DOCTYPE html> |
| <!-- |
| Copyright (c) 2013 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="/base/utils.html"> |
| |
| <script> |
| 'use strict'; |
| |
| tr.exportTo('tr.ui', function() { |
| function TimelineDisplayTransform(opt_that) { |
| if (opt_that) { |
| this.set(opt_that); |
| return; |
| } |
| this.scaleX = 1; |
| this.panX = 0; |
| this.panY = 0; |
| } |
| |
| TimelineDisplayTransform.prototype = { |
| set: function(that) { |
| this.scaleX = that.scaleX; |
| this.panX = that.panX; |
| this.panY = that.panY; |
| }, |
| |
| clone: function() { |
| return new TimelineDisplayTransform(this); |
| }, |
| |
| equals: function(that) { |
| var eq = true; |
| if (that === undefined || that === null) |
| return false; |
| eq &= this.panX === that.panX; |
| eq &= this.panY === that.panY; |
| eq &= this.scaleX === that.scaleX; |
| return !!eq; |
| }, |
| |
| almostEquals: function(that) { |
| var eq = true; |
| if (that === undefined || that === null) |
| return false; |
| eq &= Math.abs(this.panX - that.panX) < 0.001; |
| eq &= Math.abs(this.panY - that.panY) < 0.001; |
| eq &= Math.abs(this.scaleX - that.scaleX) < 0.001; |
| return !!eq; |
| }, |
| |
| incrementPanXInViewUnits: function(xDeltaView) { |
| this.panX += this.xViewVectorToWorld(xDeltaView); |
| }, |
| |
| xPanWorldPosToViewPos: function(worldX, viewX, viewWidth) { |
| if (typeof viewX == 'string') { |
| if (viewX === 'left') { |
| viewX = 0; |
| } else if (viewX === 'center') { |
| viewX = viewWidth / 2; |
| } else if (viewX === 'right') { |
| viewX = viewWidth - 1; |
| } else { |
| throw new Error('viewX must be left|center|right or number.'); |
| } |
| } |
| this.panX = (viewX / this.scaleX) - worldX; |
| }, |
| |
| xPanWorldBoundsIntoView: function(worldMin, worldMax, viewWidth) { |
| if (this.xWorldToView(worldMin) < 0) |
| this.xPanWorldPosToViewPos(worldMin, 'left', viewWidth); |
| else if (this.xWorldToView(worldMax) > viewWidth) |
| this.xPanWorldPosToViewPos(worldMax, 'right', viewWidth); |
| }, |
| |
| xSetWorldBounds: function(worldMin, worldMax, viewWidth) { |
| var worldWidth = worldMax - worldMin; |
| var scaleX = viewWidth / worldWidth; |
| var panX = -worldMin; |
| this.setPanAndScale(panX, scaleX); |
| }, |
| |
| setPanAndScale: function(p, s) { |
| this.scaleX = s; |
| this.panX = p; |
| }, |
| |
| xWorldToView: function(x) { |
| return (x + this.panX) * this.scaleX; |
| }, |
| |
| xWorldVectorToView: function(x) { |
| return x * this.scaleX; |
| }, |
| |
| xViewToWorld: function(x) { |
| return (x / this.scaleX) - this.panX; |
| }, |
| |
| xViewVectorToWorld: function(x) { |
| return x / this.scaleX; |
| }, |
| |
| applyTransformToCanvas: function(ctx) { |
| ctx.transform(this.scaleX, 0, 0, 1, this.panX * this.scaleX, 0); |
| } |
| }; |
| |
| return { |
| TimelineDisplayTransform: TimelineDisplayTransform |
| }; |
| }); |
| </script> |
