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[Importing Kiva]
To import kiva, you need to get the constants (which includes pen styles,
cap styles, lines styles, etc.), the font stuff, and a backend. You can
import these all together with a wildcard:
from kiva import *
If you prefer to get the constants by themselves, you can also do a:
import kiva
and this will allow you to refer to them as kiva.JOIN_MITER, kiva.CAP_ROUND,
etc.
If you don't wish to do a wildcard import, you can also just grab the
following by themselves:
from kiva import Font, CompiledPath, GraphicsContext,
Canvas, CanvasWindow
This will auto-detect what backend is appropriate based on the OS platform,
available libraries, and the order of backends listed in the KIVA_WISHLIST
environment variable. If this environment variable is not defined, then the
default ordering of backends is in __init__.py.
If you want to choose what backend gets used, you can do the following:
from kiva.backend_<backend> import GraphicsContext, Canvas, CanvasWindow
<backend> is one of:
image - in-memory GraphicsContext, uses Agg to raster, can save out to any PIL format
wx - uses Agg to raster to a platform-dependent wx window
wx_gl - uses Agg to raster into a platform-dependent wx.glcanvas
gl - uses OpenGL module to draw into a GL window
mac - calls Quartz drawing routines into an OS X window/GraphicsContext
ps - PostScript file output
svg - SVG file output
pdf - PDF file output (uses ReportLab)
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