Heatmap Plugin

resources/context_help/HeatmapGui-en_US

@@ -0,0 +1,27 @@
+<h1>Heatmap Plugin Help</h1>
+<p>Heatmap Plugin creates a heatmap raster for the input point vector layer. The heatmap is generated based on the number of points in a given location. The higher the number of points, the higher will be the corresponding pixel(s) value in the raster.</p>
+
+<h2>The Dialog Parameters</h2>
+
+<h3>Input Point Vector</h3>
+<p>The input is always a vector layer of point type. All the point vector layers that are currently loaded in the window are automatically populated in the input layer drop-down list. Click the Dropdown button and select the required layer.</p>
+
+<h3>Output Ratser</h3>
+<p>The output raster location and filename can be set by clicking the <label>...</label> button next to the output raster textbox.<br/>
+<b>Note:</b>The file format is automatically added depending upon the output format selected, if not explicitly given.</p>
+
+<h3>Output Format</h3>
+<p>All the file creation supporting GDAL formats are available in the drop down list. Click and select the required output format for your file.<br/>
+<b>Note:</b> GeoTiff and ERDAS Imagine .img formats are recommended. Some formats makes the application crash. Kindly stick to the recommended formats until the crash issue is resolved or Use other formats if you know about its GDAL support completely.</p>
+
+<h3>Heatmap Point Attributes</h3>
+<h4>Buffer Radius</h4>
+<p>The buffer radius specifies the number of <b>pixels or cells</b> around a point where the heat(influence) of the point will be felt. Smaller values give you clear distinction between points and bigger values gives you nicely merged heatmap regions. This is the spatial parameter of the heat region of a point.<br/>
+<b>Note:</b> The value is always a whole number.</p>
+<h4>Decay Ratio</h4>
+<p>The decay ratio defines amount of heat(influence) that should reach the outermost pixel in the Buffer Radius. It is the direct measure of the outer most value.<br/>
+<b>Example:</b> If Buffer Ratio is set as 0 and Radius as 10, then the centre pixel of a point will have value and the pixel away by a distance of 10 units will have the value 0, a pixel which is 5 units away will have a value of 0.5 and so on. Here distance is measure not by pixel count rather using sqrt( xOffset^2 + yOffset^2 ), so you always get a circular heat region.</p>
+
+<h2>Further Details</h2>
+<p>Contact the author through aruntheguy at gmail dot com</p>
+

src/plugins/CMakeLists.txt

@@ -37,3 +37,5 @@ IF (WITH_GLOBE)
 ENDIF (WITH_GLOBE)
 
 # headers installed in qgis_core target
+
+SUBDIRS (heatmap)

src/plugins/heatmap/CMakeLists.txt

@@ -0,0 +1,53 @@
+
+########################################################
+# Files
+
+SET (heatmap_SRCS
+     heatmap.cpp
+     heatmapgui.cpp
+)
+
+SET (heatmap_UIS heatmapguibase.ui)
+
+SET (heatmap_MOC_HDRS
+     heatmap.h
+     heatmapgui.h
+)
+
+SET (heatmap_RCCS  heatmap.qrc)
+
+########################################################
+# Build
+
+QT4_WRAP_UI (heatmap_UIS_H  ${heatmap_UIS})
+
+QT4_WRAP_CPP (heatmap_MOC_SRCS  ${heatmap_MOC_HDRS})
+
+QT4_ADD_RESOURCES(heatmap_RCC_SRCS ${heatmap_RCCS})
+
+ADD_LIBRARY (heatmapplugin   MODULE ${heatmap_SRCS} ${heatmap_MOC_SRCS} ${heatmap_RCC_SRCS} ${heatmap_UIS_H})
+
+INCLUDE_DIRECTORIES(
+     ${CMAKE_CURRENT_BINARY_DIR}
+     ${GEOS_INCLUDE_DIR}
+     ${GDAL_INCLUDE_DIR}
+     ../../core
+     ../../core/raster
+     ../../gui
+     ../../analysis/raster
+     ..
+)
+
+TARGET_LINK_LIBRARIES(heatmapplugin
+  qgis_core
+  qgis_gui
+)
+
+
+########################################################
+# Install
+
+INSTALL(TARGETS heatmapplugin
+  RUNTIME DESTINATION ${QGIS_PLUGIN_DIR}
+  LIBRARY DESTINATION ${QGIS_PLUGIN_DIR})
+

src/plugins/heatmap/README

@@ -0,0 +1,97 @@
+Welcome to your automatically generated plugin!
+-------------------------------------------------------------
+
+This is just a starting point. You now need to modify the code to make it do
+something useful....read on for a more information to get yourself started.
+
+Documentation:
+-------------------------------------------------------------
+
+You really need to read the QGIS API Documentation now at:
+
+http://qgis.org/api/
+
+In particular look at the following classes:
+
+QGisInterface : http://qgis.org/api/classQgisInterface.html
+QgsMapCanvas  : http://qgis.org/api/classQgsMapCanvas.html
+QgsMapTool    : http://qgis.org/api/classQgsMapTool.html
+QgisPlugin    : http://qgis.org/api/classQgisPlugin.html
+
+QGisInterface is an abstract base class (ABC) that specifies what publicly
+available features of QGIS are exposed to third party code and plugins. An
+instance of the QgisInterface is passed to the plugin when it loads. Please
+consult the QGIS development team if there is functionality required in the
+QGisInterface that is not available.
+
+QgsPlugin is an ABC that defines required behaviour your plugin must provide.
+See below for more details.
+
+What are all the files in my generated plugin directory for?
+-------------------------------------------------------------
+
+CMakeLists.txt
+This is the generated CMake file that builds the plugin. You should add you
+application specific dependencies and source files to this file.
+
+heatmap.h
+heatmap.cpp  
+This is the class that provides the 'glue' between your custom application
+logic and the QGIS application. You will see that a number of methods are
+already implemented for you - including some examples of how to add a raster or
+vector layer to the main application map canvas. This class is a concrete
+implementation of QgisPlugin (which defines required behaviour for a plugin).
+In particular, a plugin has a number of static methods and members so that the
+QgsPluginManager and plugin loader logic can identify each plugin, create an
+appropriate menu entry for it etc. Note there is nothing stopping you creating
+multiple toolbar icons and menu entries for a single plugin. By default though
+a single menu entry and toolbar button is created and its pre-configured to
+call the run() method in this class when selected. This default implementation
+provided for you by the plugin builder is well documented, so please refer to
+the code for further advice.
+
+heatmapgui.ui  
+This is a Qt designer 'ui' file. It defines the look of the default plugin
+dialog without implementing any application logic. You can modify this form to
+suite your needs or completely remove it if your plugin does not need to
+display a user form (e.g. for custom MapTools).
+
+
+heatmapgui.cpp  
+heatmapgui.h  
+This is the concrete class where application logic for the above mentioned
+dialog should go. The world is your oyster here really....
+
+heatmap.qrc  
+This is the Qt4 resources file for your plugin. The Makefile generated for your
+plugin is all set up to compile the resource file so all you need to do is add
+your additional icons etc using the simple xml file format. Note the namespace
+used for all your resources e.g. (":/Heatmap/"). It is important to use
+this prefix for all your resources. We suggest you include any other images and
+run time data in this resurce file too.
+
+heatmap.png  
+This is the icon that will be used for your plugin menu entry and toolbar icon.
+Simply replace this icon with your own icon to make your plugin disctinctive
+from the rest.
+
+README
+This file contains the documentation you are reading now!
+
+
+Getting developer help:
+-------------------------------------------------------------
+
+For Questions and Comments regarding the plugin builder template and creating
+your features in QGIS using the plugin interface please contact us via:
+
+ * the QGIS developers mailing list, or
+ * IRC (#qgis on freenode.net)
+
+QGIS is distributed under the Gnu Public License. If you create a useful plugin
+please consider contributing it back to the community.
+
+Have fun and thank you for choosing QGIS.
+
+The QGIS Team
+2007