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import cairo
import cairoplot
from .handler import Handler as _Handler
class FixedSizeHandler(_Handler):
"""Base class for handlers with a fixed size."""
def __init__(self, width, height):
"""Create with fixed width and height."""
self.dimensions = {}
self.dimensions[cairoplot.HORZ] = width
self.dimensions[cairoplot.VERT] = height
# sub-classes must create a surface
self.surface = None
def prepare(self, plot):
"""Prepare plot to render by setting its dimensions."""
_Handler.prepare(self, plot)
plot.dimensions = self.dimensions
plot.context = cairo.Context(self.surface)
def commit(self, plot):
"""Commit the plot (to a file)."""
_Handler.commit(self, plot)
# since pngs are different from other fixed size handlers,
# sub-classes are in charge of actual file writing
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