| // 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'; |
| |
| base.requireStylesheet('tracks.ruler_track'); |
| |
| base.require('tracks.track'); |
| base.require('tracks.canvas_based_track'); |
| base.require('ui'); |
| |
| base.exportTo('tracing.tracks', function() { |
| |
| /** |
| * A track that displays the ruler. |
| * @constructor |
| * @extends {CanvasBasedTrack} |
| */ |
| |
| var RulerTrack = tracing.ui.define(tracing.tracks.CanvasBasedTrack); |
| |
| var logOf10 = Math.log(10); |
| function log10(x) { |
| return Math.log(x) / logOf10; |
| } |
| |
| RulerTrack.prototype = { |
| |
| __proto__: tracing.tracks.CanvasBasedTrack.prototype, |
| |
| decorate: function() { |
| this.classList.add('ruler-track'); |
| this.strings_secs_ = []; |
| this.strings_msecs_ = []; |
| this.addEventListener('mousedown', this.onMouseDown); |
| }, |
| |
| onMouseDown: function(e) { |
| if (e.button != 0) |
| return; |
| this.placeAndBeginDraggingMarker(e.clientX); |
| }, |
| |
| |
| placeAndBeginDraggingMarker: function(clientX) { |
| var pixelRatio = window.devicePixelRatio || 1; |
| var viewX = (clientX - this.canvasContainer_.offsetLeft) * pixelRatio; |
| var worldX = this.viewport_.xViewToWorld(viewX); |
| var marker = this.viewport_.findMarkerNear(worldX, 6); |
| var createdMarker = false; |
| var movedMarker = false; |
| if (!marker) { |
| marker = this.viewport_.addMarker(worldX); |
| createdMarker = true; |
| } |
| marker.selected = true; |
| |
| var that = this; |
| var onMouseMove = function(e) { |
| var viewX = (e.clientX - that.canvasContainer_.offsetLeft) * pixelRatio; |
| var worldX = that.viewport_.xViewToWorld(viewX); |
| marker.positionWorld = worldX; |
| movedMarker = true; |
| }; |
| |
| var onMouseUp = function(e) { |
| marker.selected = false; |
| if (!movedMarker && !createdMarker) |
| that.viewport_.removeMarker(marker); |
| document.removeEventListener('mouseup', onMouseUp); |
| document.removeEventListener('mousemove', onMouseMove); |
| }; |
| |
| document.addEventListener('mouseup', onMouseUp); |
| document.addEventListener('mousemove', onMouseMove); |
| }, |
| |
| drawLine_: function(ctx, x1, y1, x2, y2, color) { |
| ctx.beginPath(); |
| ctx.moveTo(x1, y1); |
| ctx.lineTo(x2, y2); |
| ctx.closePath(); |
| ctx.strokeStyle = color; |
| ctx.stroke(); |
| }, |
| |
| drawArrow_: function(ctx, x1, y1, x2, y2, arrowWidth, color) { |
| |
| this.drawLine_(ctx, x1, y1, x2, y2, color); |
| |
| var dx = x2 - x1; |
| var dy = y2 - y1; |
| var len = Math.sqrt(dx * dx + dy * dy); |
| var perc = (len - 10) / len; |
| var bx = x1 + perc * dx; |
| var by = y1 + perc * dy; |
| var ux = dx / len; |
| var uy = dy / len; |
| var ax = uy * arrowWidth; |
| var ay = -ux * arrowWidth; |
| |
| ctx.beginPath(); |
| ctx.fillStyle = color; |
| ctx.moveTo(bx + ax, by + ay); |
| ctx.lineTo(x2, y2); |
| ctx.lineTo(bx - ax, by - ay); |
| ctx.lineTo(bx + ax, by + ay); |
| ctx.closePath(); |
| ctx.fill(); |
| }, |
| |
| redraw: function() { |
| var ctx = this.ctx_; |
| var canvasW = this.canvas_.width; |
| var canvasH = this.canvas_.height; |
| |
| ctx.clearRect(0, 0, canvasW, canvasH); |
| |
| // Culling parametrs. |
| var vp = this.viewport_; |
| var pixWidth = vp.xViewVectorToWorld(1); |
| var viewLWorld = vp.xViewToWorld(0); |
| var viewRWorld = vp.xViewToWorld(canvasW); |
| |
| var measurements = this.classList.contains( |
| 'ruler-track-with-distance-measurements'); |
| |
| var rulerHeight = measurements ? canvasH / 2 : canvasH; |
| |
| for (var i = 0; i < vp.markers.length; ++i) { |
| vp.markers[i].drawTriangle_(ctx, viewLWorld, viewRWorld, |
| canvasH, rulerHeight, vp); |
| } |
| |
| var pixelRatio = window.devicePixelRatio || 1; |
| var idealMajorMarkDistancePix = 150 * pixelRatio; |
| var idealMajorMarkDistanceWorld = |
| vp.xViewVectorToWorld(idealMajorMarkDistancePix); |
| |
| var majorMarkDistanceWorld; |
| var unit; |
| var unitDivisor; |
| var tickLabels; |
| |
| // The conservative guess is the nearest enclosing 0.1, 1, 10, 100, etc. |
| var conservativeGuess = |
| Math.pow(10, Math.ceil(log10(idealMajorMarkDistanceWorld))); |
| |
| // Once we have a conservative guess, consider things that evenly add up |
| // to the conservative guess, e.g. 0.5, 0.2, 0.1 Pick the one that still |
| // exceeds the ideal mark distance. |
| var divisors = [10, 5, 2, 1]; |
| for (var i = 0; i < divisors.length; ++i) { |
| var tightenedGuess = conservativeGuess / divisors[i]; |
| if (vp.xWorldVectorToView(tightenedGuess) < idealMajorMarkDistancePix) |
| continue; |
| majorMarkDistanceWorld = conservativeGuess / divisors[i - 1]; |
| break; |
| } |
| var tickLabels = undefined; |
| if (majorMarkDistanceWorld < 100) { |
| unit = 'ms'; |
| unitDivisor = 1; |
| tickLabels = this.strings_msecs_; |
| } else { |
| unit = 's'; |
| unitDivisor = 1000; |
| tickLabels = this.strings_secs_; |
| } |
| |
| var numTicksPerMajor = 5; |
| var minorMarkDistanceWorld = majorMarkDistanceWorld / numTicksPerMajor; |
| var minorMarkDistancePx = vp.xWorldVectorToView(minorMarkDistanceWorld); |
| |
| var firstMajorMark = |
| Math.floor(viewLWorld / majorMarkDistanceWorld) * |
| majorMarkDistanceWorld; |
| |
| var minorTickH = Math.floor(canvasH * 0.25); |
| |
| ctx.fillStyle = 'rgb(0, 0, 0)'; |
| ctx.strokeStyle = 'rgb(0, 0, 0)'; |
| ctx.textAlign = 'left'; |
| ctx.textBaseline = 'top'; |
| |
| var pixelRatio = window.devicePixelRatio || 1; |
| ctx.font = (9 * pixelRatio) + 'px sans-serif'; |
| |
| // Each iteration of this loop draws one major mark |
| // and numTicksPerMajor minor ticks. |
| // |
| // Rendering can't be done in world space because canvas transforms |
| // affect line width. So, do the conversions manually. |
| for (var curX = firstMajorMark; |
| curX < viewRWorld; |
| curX += majorMarkDistanceWorld) { |
| |
| var curXView = Math.floor(vp.xWorldToView(curX)); |
| |
| var unitValue = curX / unitDivisor; |
| var roundedUnitValue = Math.floor(unitValue * 100000) / 100000; |
| |
| if (!tickLabels[roundedUnitValue]) |
| tickLabels[roundedUnitValue] = roundedUnitValue + ' ' + unit; |
| ctx.fillText(tickLabels[roundedUnitValue], |
| curXView + 2 * pixelRatio, 0); |
| ctx.beginPath(); |
| |
| // Major mark |
| ctx.moveTo(curXView, 0); |
| ctx.lineTo(curXView, rulerHeight); |
| |
| // Minor marks |
| for (var i = 1; i < numTicksPerMajor; ++i) { |
| var xView = Math.floor(curXView + minorMarkDistancePx * i); |
| ctx.moveTo(xView, rulerHeight - minorTickH); |
| ctx.lineTo(xView, rulerHeight); |
| } |
| |
| ctx.stroke(); |
| } |
| |
| // Give distance between directly adjacent markers. |
| if (measurements) { |
| |
| // Divide canvas horizontally between ruler and measurements. |
| ctx.moveTo(0, rulerHeight); |
| ctx.lineTo(canvasW, rulerHeight); |
| ctx.stroke(); |
| |
| // Obtain a sorted array of markers |
| var sortedMarkers = vp.markers.slice(); |
| sortedMarkers.sort(function(a, b) { |
| return a.positionWorld_ - b.positionWorld_; |
| }); |
| |
| // Distance Variables. |
| var displayDistance; |
| var unitDivisor; |
| var displayTextColor = 'rgb(0,0,0)'; |
| var measurementsPosY = rulerHeight + 2; |
| |
| // Arrow Variables. |
| var arrowSpacing = 10; |
| var arrowColor = 'rgb(128,121,121)'; |
| var arrowPosY = measurementsPosY + 4; |
| var arrowWidthView = 3; |
| var spaceForArrowsView = 2 * (arrowWidthView + arrowSpacing); |
| |
| for (i = 0; i < sortedMarkers.length - 1; i++) { |
| var rightMarker = sortedMarkers[i + 1]; |
| var leftMarker = sortedMarkers[i]; |
| var distanceBetweenMarkers = |
| rightMarker.positionWorld - leftMarker.positionWorld; |
| var distanceBetweenMarkersView = |
| vp.xWorldVectorToView(distanceBetweenMarkers); |
| |
| var positionInMiddleOfMarkers = leftMarker.positionWorld + |
| distanceBetweenMarkers / 2; |
| var positionInMiddleOfMarkersView = |
| vp.xWorldToView(positionInMiddleOfMarkers); |
| |
| // Determine units. |
| if (distanceBetweenMarkers < 100) { |
| unit = 'ms'; |
| unitDivisor = 1; |
| } else { |
| unit = 's'; |
| unitDivisor = 1000; |
| } |
| // Calculate display value to print. |
| displayDistance = distanceBetweenMarkers / unitDivisor; |
| var roundedDisplayDistance = |
| Math.abs((Math.floor(displayDistance * 1000) / 1000)); |
| var textToDraw = roundedDisplayDistance + ' ' + unit; |
| var textWidthView = ctx.measureText(textToDraw).width; |
| var textWidthWorld = vp.xViewVectorToWorld(textWidthView); |
| var spaceForArrowsAndTextView = textWidthView + |
| spaceForArrowsView + arrowSpacing; |
| |
| // Set text positions. |
| var textLeft = leftMarker.positionWorld + |
| (distanceBetweenMarkers / 2) - (textWidthWorld / 2); |
| var textRight = textLeft + textWidthWorld; |
| var textPosY = measurementsPosY; |
| var textLeftView = vp.xWorldToView(textLeft); |
| var textRightView = vp.xWorldToView(textRight); |
| var leftMarkerView = vp.xWorldToView(leftMarker.positionWorld); |
| var rightMarkerView = vp.xWorldToView(rightMarker.positionWorld); |
| var textDrawn = false; |
| |
| if (spaceForArrowsAndTextView <= distanceBetweenMarkersView) { |
| // Print the display distance text. |
| ctx.fillStyle = displayTextColor; |
| ctx.fillText(textToDraw, textLeftView, textPosY); |
| textDrawn = true; |
| } |
| |
| if (spaceForArrowsView <= distanceBetweenMarkersView) { |
| var leftArrowStart; |
| var rightArrowStart; |
| if (textDrawn) { |
| leftArrowStart = textLeftView - arrowSpacing; |
| rightArrowStart = textRightView + arrowSpacing; |
| } else { |
| leftArrowStart = positionInMiddleOfMarkersView; |
| rightArrowStart = positionInMiddleOfMarkersView; |
| } |
| // Draw left arrow. |
| this.drawArrow_(ctx, leftArrowStart, arrowPosY, |
| leftMarkerView, arrowPosY, arrowWidthView, arrowColor); |
| // Draw right arrow. |
| this.drawArrow_(ctx, rightArrowStart, arrowPosY, |
| rightMarkerView, arrowPosY, arrowWidthView, arrowColor); |
| } |
| } |
| } |
| }, |
| |
| /** |
| * Adds items intersecting a point to a selection. |
| * @param {number} vX X location to search at, in viewspace. |
| * @param {number} vY Y location to search at, in viewspace. |
| * @param {Selection} selection Selection to which to add hits. |
| * @return {boolean} true if a slice was found, otherwise false. |
| */ |
| addIntersectingItemsToSelection: function(vX, vY, selection) { |
| // Does nothing. There's nothing interesting to pick on the ruler |
| // track. |
| }, |
| |
| /** |
| * Adds items intersecting the given range to a selection. |
| * @param {number} loVX Lower X bound of the interval to search, in |
| * viewspace. |
| * @param {number} hiVX Upper X bound of the interval to search, in |
| * viewspace. |
| * @param {number} loVY Lower Y bound of the interval to search, in |
| * viewspace. |
| * @param {number} hiVY Upper Y bound of the interval to search, in |
| * viewspace. |
| * @param {Selection} selection Selection to which to add hits. |
| */ |
| addIntersectingItemsInRangeToSelection: function( |
| loVX, hiVX, loY, hiY, selection) { |
| // Does nothing. There's nothing interesting to pick on the ruler |
| // track. |
| }, |
| |
| addAllObjectsMatchingFilterToSelection: function(filter, selection) { |
| } |
| }; |
| |
| return { |
| RulerTrack: RulerTrack |
| }; |
| }); |