| Introduction |
| Contents |
| Getting Started |
| Download |
| Navigating |
| Tutorials |
| Scripting |
| Advanced |
| About |
Class STToRaster
Extends STTransform
Process and static functions to render rasters from layers and geometries.
This class has two basic operations; rendering a raster for drawing
to the screen and converting vector data into a raster with the raster pixel
values from the attributes related with a layer. The latter can be used
to convert vector data into rasters for analysis.
Inputs include both STItems and STLayers
As a static class, it provides a set of utilities to render raster data from layers
and geometies.
NewRaster() - creates a destination raster to draw into
NewView() - creates a view to draw into based on the raster from NewRaster()
jjg - should pass in the background color
Copyright, SchoonerTurtles LLP, 2009
@author Jim Graham
Static Functions
| Returns | Function | Throws |
|---|---|---|
| AddCounts(STLayer TheItem,STRaster TheRaster) | Exception | |
| STRaster |
FromAttribute(STLayer TheItem,int AttributeColumnIndex,
ATTRIBUTE_CALC TheCalc,STRaster TheRaster) |
Exception |
| STRaster |
Paint(STArea TheRegion,double PixelRefWidth,
PIXEL_TYPE PixelType,Color BackgroundColor, STStyle TheStyle,boolean HasMask) |
Exception |
Static Functions
AddCounts(STLayer TheItem,STRaster TheRaster) Exception
Add the number of points that appear in each pixel in the specified raster.
Parameters:
ThePointLayer
TheRaster
Throws: Exception
STRaster FromAttribute(STLayer TheItem,int AttributeColumnIndex,
ATTRIBUTE_CALC TheCalc,STRaster TheRaster)
Exception
Add the number of points that appear in each pixel in the specified raster.
Parameters:
ThePointLayer
TheRaster
Throws: Exception
STRaster Paint(STArea TheRegion,double PixelRefWidth,
PIXEL_TYPE PixelType,Color BackgroundColor,
STStyle TheStyle,boolean HasMask)
Exception
Renders a single area in a region into a raster. This is required to
keep the size of the rasters relatively small for regions like the
United States or Alaska where the alutian islands are on the other side
of the international date line so a raster containing one of these
regions would cover the entire world.
Parameters:
TheRegion - The region to draw into the raster
AreaIndex - The area within the region to draw
PixelRefWidth - the width of each pixel
PixelType - GRAY or RGB
BackgroundColor - Background color for the raster
TheStyle - style to use to draw raster. This includes the antialiasing setting