Developer's Guide - MapGuide Open Source - OSGeo

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Introduction MapGuide includes services for saving map representations for use in external programs. To save a map as a bit-mapped image (PNG or GIF), use the Rendering Service. To save a map as a Design Web Format (DWF), use the Mapping Service. DWF files can be saved in two variations. An eMap DWF contains metadata that describes the current map view, not the map data itself. This is a compact format, but it requires access to the map agent to view the map. It is not suitable for offline viewing, and it requires a current MapGuide session. An ePlot DWF is designed for offline viewing or printing. It can contain multiple sheets, where each sheet is a complete map image that can be viewed offline using the Autodesk DWF Viewer. Each sheet in an ePlot DWF is a static representation of a single map view state. Characteristics of bit-mapped images: ■ Images can be in PNG or GIF formats. ■ An image displays a portion of the the map view state at a particular scale. ■ The image is static with a fixed resolution. Zooming in creates a pixelated image. ■ Images are cross-platform. ■ Images are suitable for use in HTML pages, word processor documents, or graphics editing programs. Characteristics of an ePlot DWF: ■ A single ePlot can contain multiple sheets. ■ Each sheet shows a single image, showing a portion of the map view at a particular scale. ■ The ePlot area and scale are static, but geometric features are stored as vector graphics, so zooming is smooth. ■ Some interactive features of the MapGuide DWF Viewer are available, such as the ability to turn layers on and off. ■ The ePlot requires the Autodesk DWF Viewer, either standalone or as a plug-in for Internet Explorer. 96 | Chapter 7 Custom Output
■ Images can be copied to the Windows clipboard and used in other applications. ■ The Autodesk DWF Viewer is only available on Windows. Characteristics of an eMap DWF: ■ An eMap DWF is dynamic, with all the zooming and panning capabilities of the MapGuide DWF Viewer. ■ Because the eMap Viewer uses the map agent, the entire map is available for smooth zooming and panning. The layer stylization rules apply. ■ The eMap requires the Autodesk DWF Viewer, either standalone or as a plug-in for Internet Explorer. ■ The eMap requires an active MapGuide session. If the session times out the map cannot be displayed. ■ Individual views from an eMap DWF can be saved as ePlot DWFs. ■ The Autodesk DWF Viewer is only available on Windows. Rendering Service The Rendering Service creates bit-mapped images of a map suitable for displaying in a browser or saving to a file. The image is returned as an MgByteReader object, which can be sent to a browser or saved to a file. For example, to create a PNG image of a map area, perform the following operations. Note that the aspect ratio of the envelope should match the image dimensions or the image will be distorted. $byteReader = $renderingService->RenderMap($map, $selection, $envelope, $imageWidth, $imageHeight, $color, 'PNG'); header("Content-type: " . $byteReader->GetMimeType() ); $buffer = ''; while ($byteReader->Read($buffer, 50000) != 0) { echo $buffer; } Rendering Service | 97
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MapGuide Open Source Developer’s
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Contents Chapter 1 Introduction . .
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Another Way To Create Layers . . .
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What This Guide Covers This guide d
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This next sample MapGuide page disp
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Example Code This sample illustrate
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echo 'Map ' . $map->GetName() . ' u
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displays the spatial reference syst
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Viewer Frames Most custom MSPs disp
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Viewer Sample Application - Zoom
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Embedding a Viewer in Your Own Page
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Resources and Repositories A MapGui
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$mapDefId = new MgResourceIdentifie
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Overview of Layers Layers represent
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Layer Style Layer Visibility The da
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function OnPageLoad() { parent.Zoom
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MgInitializeWebTier ($webconfigFile
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Working With Feature Data 3 In this
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Querying Feature Data In order to w
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Examples These examples assume that
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$districtQuery = new MgFeatureQuery
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$districtQuery = new MgFeatureQuery
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There are different selection tools
Page 51 and 52: Script command. See Example: Listin
Page 53 and 54: 4 Initialize the MgSelection object
Page 55 and 56: the $layerClassName = $layer->GetFe
Page 57 and 58: The PHP code in this example create
Page 59 and 60: $resourceService = $siteConnection-
Page 61 and 62: Modifying Maps and Layers In this c
Page 63 and 64: This example ■ loads a layer that
Page 65 and 66: } // ... The page then goes on to s
Page 67 and 68: Function CreateScaleRange() CreateA
Page 69 and 70: Function CreateLineTypeStyle() Crea
Page 71 and 72: ... //-----------------------------
Page 73 and 74: Adding Layers To A Map The precedin
Page 75 and 76: function add_layer_resource_to_map(
Page 77 and 78: Analyzing Features In this chapter
Page 79 and 80: ■ MgLineString — a series of co
Page 81 and 82: To create an MgCoordinateSystem obj
Page 83 and 84: ■ Determine the SRS for the featu
Page 85 and 86: Inserting, Deleting, and Updating F
Page 87 and 88: Example $queryOptions = new MgFeatu
Page 89 and 90: } The geometries for the selected f
Page 91 and 92: $map->Save($resourceService); The f
Page 93 and 94: } 'ResourceId')->item(0); $featureS
Page 95 and 96: Digitizing and Redlining In this ch
Page 97 and 98: For example, see task_pane_redlinin
Page 99 and 100: Create a temporary feature source t
Page 101: Custom Output In this chapter ■ I
Page 105: $dwfVersion = new MgDwfVersion("6.0
Page 108 and 109: G geographic coordinates 74 geometr
Page 110: Viewer, embedded in HTML page 17 Vi
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Developer's Guide - MapGuide Open Source - OSGeo

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