QGIS-2.8-PyQGISDeveloperCookbook-en(4)
时间：2025-03-11
为开发人员准备的文档,涵盖QGIS的多种功能实现和代码。
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9RubberBandsandVertexMarkers..................................WritingCustomMapTools.....................................WritingCustomMapCanvasItems.................................37383941
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85MapRenderingandPrinting9.1SimpleRendering..........................................9.2RenderinglayerswithdifferentCRS.................................9.3OutputusingMapComposer.....................................10Expressions,FilteringandCalculatingValues10.1ParsingExpressions.........................................10.2EvaluatingExpressions........................................10.3Examples...............................................11ReadingAndStoringSettings12Communicatingwiththeuser12.1Showingmessages.TheQgsMessageBarclass.........................12.2Showingprogress..........................................12.3Logging................................................13DevelopingPythonPlugins13.1Writingaplugin...........................................13.2Plugincontent............................................13.3Documentation............................................14IDEsettingsforwritinganddebuggingplugins14.1Anoteoncon guringyourIDEonWindows............................14.2DebuggingusingEclipseandPyDev................................14.3DebuggingusingPDB........................................15UsingPluginLayers15.1SubclassingQgsPluginLayer.....................................16CompatibilitywitholderQGISversions16.1Pluginmenu.............................................17Releasingyourplugin17.1Metadataandnames.........................................17.2Codeandhelp............................................17.3Of cialpythonpluginrepository..................................18CodeSnippets18.1Howtocallamethodbyakeyshortcut...............................18.2HowtotoggleLayers........................................18.3Howtoaccessattributetableofselectedfeatures..........................19Networkanalysislibrary19.1Generalinformation.........................................19.2Buildingagraph...........................................19.3Graphanalysis............................................Index
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