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https://github.com/NASAWorldWind/WebWorldWind.git
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96c4f70f19
* Refactored ScreenText example - Eliminated offset modification after creation. It exposed the mutable nature of the TextAttributes.offset. - Changed its focus at the end. Showcased how TextAttributes.offset can be used for text alignment. * Removed common TextAttributes object to use default attributes instead * Corrected previously missing whitespace
90 lines
4.4 KiB
JavaScript
90 lines
4.4 KiB
JavaScript
/*
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* Copyright 2003-2006, 2009, 2017, United States Government, as represented by the Administrator of the
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* National Aeronautics and Space Administration. All rights reserved.
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*
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* The NASAWorldWind/WebWorldWind platform is licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* Illustrates how to display text overlays. Uses offsets to align the text relative to its position.
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*/
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requirejs(['./WorldWindShim',
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'./LayerManager'],
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function (WorldWind,
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LayerManager) {
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"use strict";
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// Tell WorldWind to log only warnings and errors.
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WorldWind.Logger.setLoggingLevel(WorldWind.Logger.LEVEL_WARNING);
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// Create the WorldWindow.
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var wwd = new WorldWind.WorldWindow("canvasOne");
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// Create and add layers to the WorldWindow.
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var layers = [
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// Imagery layers.
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{layer: new WorldWind.BMNGLayer(), enabled: true},
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{layer: new WorldWind.BingAerialWithLabelsLayer(null), enabled: true},
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// Add atmosphere layer on top of all base layers.
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{layer: new WorldWind.AtmosphereLayer(), enabled: true},
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// WorldWindow UI layers.
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{layer: new WorldWind.CompassLayer(), enabled: true},
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{layer: new WorldWind.CoordinatesDisplayLayer(wwd), enabled: true},
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{layer: new WorldWind.ViewControlsLayer(wwd), enabled: true}
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];
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for (var l = 0; l < layers.length; l++) {
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layers[l].layer.enabled = layers[l].enabled;
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wwd.addLayer(layers[l].layer);
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}
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var screenText, screenOffset;
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// Create a Renderable Layer to hold the ScreenTexts.
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var textLayer = new WorldWind.RenderableLayer("Screen Text");
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// Create left ScreenText
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screenOffset = new WorldWind.Offset(WorldWind.OFFSET_FRACTION, 0, WorldWind.OFFSET_FRACTION, 0.5);
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screenText = new WorldWind.ScreenText(screenOffset, "Left");
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// Use the attributes offset to position the left side of the text string at the shape's screen location.
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screenText.attributes.offset = new WorldWind.Offset(WorldWind.OFFSET_FRACTION, 0, WorldWind.OFFSET_FRACTION, 0.5);
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textLayer.addRenderable(screenText);
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// Create right ScreenText
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screenOffset = new WorldWind.Offset(WorldWind.OFFSET_FRACTION, 1, WorldWind.OFFSET_FRACTION, 0.5);
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screenText = new WorldWind.ScreenText(screenOffset, "Right");
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// Use the attributes offset to position the right side of the text string at the shape's screen location.
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screenText.attributes.offset = new WorldWind.Offset(WorldWind.OFFSET_FRACTION, 1, WorldWind.OFFSET_FRACTION, 0.5);
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textLayer.addRenderable(screenText);
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// The same screen offset value will be commonly used between the center-positioned ScreenTexts.
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// Their TextAttributes offsets will be used to adjust their text alignment.
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screenOffset = new WorldWind.Offset(WorldWind.OFFSET_FRACTION, 0.5, WorldWind.OFFSET_FRACTION, 0.5);
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// Center ScreenText, right-aligned
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screenText = new WorldWind.ScreenText(screenOffset, "Center, right-aligned.");
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// Use the attributes offset to right-align the text to the shape's screen location.
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screenText.attributes.offset = new WorldWind.Offset(WorldWind.OFFSET_FRACTION, 1, WorldWind.OFFSET_FRACTION, 0.5);
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textLayer.addRenderable(screenText);
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// Center ScreenText, left-aligned
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screenText = new WorldWind.ScreenText(screenOffset, "Center, left-aligned.");
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// Use the attributes offset to left-align the text to the shape's screen location.
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screenText.attributes.offset = new WorldWind.Offset(WorldWind.OFFSET_FRACTION, 0, WorldWind.OFFSET_FRACTION, 0.5);
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textLayer.addRenderable(screenText);
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// Add the text layer to the WorldWindow's layer list.
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wwd.addLayer(textLayer);
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// Create a layer manager for controlling layer visibility.
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var layerManager = new LayerManager(wwd);
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}); |