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java开发surface,World Wind Java开发之十――AnalyticSurface栅格渲染

發布時間:2024/9/19 51 豆豆
生活随笔 收集整理的這篇文章主要介紹了 java开发surface,World Wind Java开发之十――AnalyticSurface栅格渲染 小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

1、AnalyticSurfaceDemo

ArcGIS下對柵格的各種分級渲染效果是非常好的,可以做出很漂亮的圖,現在在WW下也能夠做出一樣的效果了,看到這里是否是有點小興奮呢。先看下WW自帶的AnalyticSurfaceDemo的運行效果圖:

通過看源代碼可以知道給出了3種渲染示例,其中兩種是動態的,這里我需要的是對dem數據或是單波段影象的渲染,也就是左上方的渲染效果。

2、AnalyticSurface類

下面來看下主要用到的類:

主要用到的方法:

// 創建AnalyticSurface并設置其屬性

final AnalyticSurface surface = new AnalyticSurface();

surface.setSector(raster.getSector());

surface.setDimensions(raster.getWidth(), raster.getHeight());

surface.setValues(AnalyticSurface.createColorGradientValues(

raster.getBuffer(), raster.getTransparentValue(), extremes[0],

extremes[1], minHue, maxHue));

// surface.setVerticalScale(5e3);

// 設置表面渲染方式為 CLAMP_TO_GROUND

surface.setAltitudeMode(WorldWind.CLAMP_TO_GROUND);根據自己的需要可以查閱開發文檔設置其他屬性。

3、DEM渲染實例

將demo中的代碼略加修改封裝為AnalyticSurfaceUtil類以供后面所有柵格數據的渲染使用,目前比較簡單,后面陸續擴充該類。

WW下渲染效果:

ArcMap下渲染效果:

可以看到WW下渲染的效果絲絕不遜色,圖是否是很漂亮呢。

4、洪澇摹擬渲染

這是對之前洪澇摹擬的改進,對洪澇摹擬輸出的范圍圖和深度圖進行渲染。

(1)范圍圖

(2)深度圖

這幅渲染的深度圖是否是有種火山噴發的感覺,很有藝術美感,非常喜歡這個渲染的效果。改1下配色再看下另外一種渲染效果:

5、源碼。

下面是自己封裝的AnalyticSurfaceUtil類,供大家參考:

/**

* @Copyright 2014⑵020 @劉碩

**/

package edu.whu.vge.util;

import gov.nasa.worldwind.WorldWind;

import gov.nasa.worldwind.avlist.AVKey;

import gov.nasa.worldwind.avlist.AVList;

import gov.nasa.worldwind.data.BufferWrapperRaster;

import gov.nasa.worldwind.data.DataRaster;

import gov.nasa.worldwind.data.DataRasterReader;

import gov.nasa.worldwind.data.DataRasterReaderFactory;

import gov.nasa.worldwind.exception.WWRuntimeException;

import gov.nasa.worldwind.geom.Extent;

import gov.nasa.worldwind.geom.Sector;

import gov.nasa.worldwind.layers.RenderableLayer;

import gov.nasa.worldwind.render.DrawContext;

import gov.nasa.worldwind.render.Renderable;

import gov.nasa.worldwind.util.Logging;

import gov.nasa.worldwind.util.WWBufferUtil;

import gov.nasa.worldwind.util.WWIO;

import gov.nasa.worldwind.util.WWMath;

import gov.nasa.worldwindx.examples.analytics.AnalyticSurface;

import gov.nasa.worldwindx.examples.analytics.AnalyticSurfaceAttributes;

import gov.nasa.worldwindx.examples.analytics.AnalyticSurfaceLegend;

import gov.nasa.worldwindx.examples.util.ExampleUtil;

import java.awt.Point;

import java.io.File;

import java.text.DecimalFormat;

import java.text.FieldPosition;

import java.text.Format;

import javax.swing.SwingUtilities;

/**

* @項目名稱:SmartScope

* @類名稱:AnalyticSurfaceUtil

* @類描寫:

* @創建人:劉碩

* @創建時間:2015⑴⑵1 下午3:40:54

* @修改備注:

* @版本:

*/

public class AnalyticSurfaceUtil

{

/**

* 創建1個新的實例 AnalyticSurfaceUtil.

*

*/

public AnalyticSurfaceUtil()

{

// TODO Auto-generated constructor stub

}

public static void createPrecipitationSurface(double minHue, double maxHue,

final RenderableLayer outLayer)

{

String DATA_PATH = "J:/data/wwj/FloodDepth.tif";

BufferWrapperRaster raster = loadRasterElevations(DATA_PATH);

if (raster == null)

return;

// 獲得像元最大值與最小值

double[] extremes = WWBufferUtil.computeExtremeValues(

raster.getBuffer(), raster.getTransparentValue());

if (extremes == null)

return;

// 創建AnalyticSurface并設置其屬性

final AnalyticSurface surface = new AnalyticSurface();

surface.setSector(raster.getSector());

surface.setDimensions(raster.getWidth(), raster.getHeight());

surface.setValues(AnalyticSurface.createColorGradientValues(

raster.getBuffer(), raster.getTransparentValue(), extremes[0],

extremes[1], minHue, maxHue));

// surface.setVerticalScale(5e3);

// 設置表面渲染方式為 CLAMP_TO_GROUND

surface.setAltitudeMode(WorldWind.CLAMP_TO_GROUND);

AnalyticSurfaceAttributes attr = new AnalyticSurfaceAttributes();

attr.setDrawOutline(false);

attr.setDrawShadow(false);

attr.setInteriorOpacity(0.6);

surface.setSurfaceAttributes(attr);

// 設置圖例樣式

Format legendLabelFormat = new DecimalFormat("# m")

{

public StringBuffer format(double number, StringBuffer result,

FieldPosition fieldPosition)

{

double valueInFeet = number;

return super.format(valueInFeet, result, fieldPosition);

}

};

// 創建圖例

final AnalyticSurfaceLegend legend = AnalyticSurfaceLegend.fromColorGradient(

extremes[0], extremes[1], minHue, maxHue,

AnalyticSurfaceLegend.createDefaultColorGradientLabels(

extremes[0], extremes[1], legendLabelFormat),

AnalyticSurfaceLegend.createDefaultTitle("Legend"));

legend.setOpacity(0.8);

legend.setScreenLocation(new Point(100, 300));

SwingUtilities.invokeLater(new Runnable()

{

public void run()

{

surface.setClientLayer(outLayer);

outLayer.addRenderable(surface);

outLayer.addRenderable(createLegendRenderable(surface, 600,

legend));

}

});

}

/**

*

* @方法名稱: loadRasterElevations ;

* @方法描寫: 讀取數據(單波段) ;

* @參數 :@param path

* @參數 :@return

* @返回類型: BufferWrapperRaster ;

* @創建人:劉碩;

* @創建時間:2015⑴⑵2 上午11:25:40;

* @throws

*/

public static BufferWrapperRaster loadRasterElevations(String path)

{

// Download the data and save it in a temp file.

File file = ExampleUtil.saveResourceToTempFile(path,

"." + WWIO.getSuffix(path));

// Create a raster reader for the file type.

DataRasterReaderFactory readerFactory = (DataRasterReaderFactory) WorldWind.createConfigurationComponent(AVKey.DATA_RASTER_READER_FACTORY_CLASS_NAME);

DataRasterReader reader = readerFactory.findReaderFor(file, null);

try

{

// Before reading the raster, verify that the file contains

// elevations.

AVList metadata = reader.readMetadata(file, null);

if (metadata == null

|| !AVKey.ELEVATION.equals(metadata.getStringValue(AVKey.PIXEL_FORMAT)))

{

String msg = Logging.getMessage(

"ElevationModel.SourceNotElevations",

file.getAbsolutePath());

Logging.logger().severe(msg);

throw new IllegalArgumentException(msg);

}

// Read the file into the raster.

DataRaster[] rasters = reader.read(file, null);

if (rasters == null || rasters.length == 0)

{

String msg = Logging.getMessage(

"ElevationModel.CannotReadElevations",

file.getAbsolutePath());

Logging.logger().severe(msg);

throw new WWRuntimeException(msg);

}

// Determine the sector covered by the elevations. This

// information

// is in the GeoTIFF file or auxiliary

// files associated with the elevations file.

Sector sector = (Sector) rasters[0].getValue(AVKey.SECTOR);

if (sector == null)

{

String msg = Logging.getMessage("DataRaster.MissingMetadata",

AVKey.SECTOR);

Logging.logger().severe(msg);

throw new IllegalArgumentException(msg);

}

// Request a sub-raster that contains the whole file. This step

// is

// necessary because only sub-rasters

// are reprojected (if necessary); primary rasters are not.

int width = rasters[0].getWidth();

int height = rasters[0].getHeight();

DataRaster subRaster = rasters[0].getSubRaster(width, height,

sector, rasters[0]);

// Verify that the sub-raster can create a ByteBuffer, then

// create

// one.

if (!(subRaster instanceof BufferWrapperRaster))

{

String msg = Logging.getMessage(

"ElevationModel.CannotCreateElevationBuffer", path);

Logging.logger().severe(msg);

throw new WWRuntimeException(msg);

}

return (BufferWrapperRaster) subRaster;

}

catch (Exception e)

{

e.printStackTrace();

return null;

}

}

/**

*

* @方法名稱: createLegendRenderable ;

* @方法描寫: 創建圖例 ;

* @參數 :@param surface

* @參數 :@param surfaceMinScreenSize

* @參數 :@param legend

* @參數 :@return

* @返回類型: Renderable ;

* @創建人:劉碩;

* @創建時間:2015⑴⑵2 上午11:26:07;

* @throws

*/

protected static Renderable createLegendRenderable(

final AnalyticSurface surface, final double surfaceMinScreenSize,

final AnalyticSurfaceLegend legend)

{

return new Renderable()

{

public void render(DrawContext dc)

{

Extent extent = surface.getExtent(dc);

if (!extent.intersects(dc.getView().getFrustumInModelCoordinates()))

return;

if (WWMath.computeSizeInWindowCoordinates(dc, extent) < surfaceMinScreenSize)

return;

legend.render(dc);

}

};

}

}

目前還很不完善,后面有需要的話打算做1個類似于ArcGIS的分級渲染工具,對降雨量蒸散發量等數據都可以很方便的進行渲染。

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