def renderLineSampleImage(line, width, dpi = 100):
import Debug
# Debug.printCall(None, (line, width))
from matplotlib.backends.backend_agg import RendererAgg as Renderer
from matplotlib.lines import Line2D
useValue = True
try:
from matplotlib.transforms import Value
except ImportError:
useValue = False
from PyQt4 import QtGui
attributes = ["antialiased", "color", "dash_capstyle", "dash_joinstyle",
"linestyle", "linewidth", "marker", "markeredgecolor",
"markeredgewidth", "markerfacecolor", "markersize",
"solid_capstyle", "solid_joinstyle"]
lineAttributes = dict()
for attribute in attributes:
lineAttributes[attribute] = getattr(line, "get_" + attribute)()
height = max(lineAttributes["linewidth"], lineAttributes["markersize"] * 1.4 + 2 + 2*lineAttributes["markeredgewidth"])
pixmapWidth = int(width + lineAttributes["markersize"] * 1.4 + 2 + 2*lineAttributes["markeredgewidth"]) + 1
markerSize = lineAttributes["markersize"]
if(useValue):
renderer = Renderer(pixmapWidth, height, Value(dpi))
else:
renderer = Renderer(pixmapWidth, height, dpi)
linePos = int(height / 2 + 1)
sampleLine = Line2D([markerSize, pixmapWidth - markerSize], [linePos, linePos], **lineAttributes)
sampleLine.draw(renderer)
lineImageStr = renderer.tostring_argb()
lineARGB = [map(ord, lineImageStr[i:i+4]) for i in xrange(0, len(lineImageStr), 4)]
image = QtGui.QImage(pixmapWidth, height, QtGui.QImage.Format_ARGB32)
for x in xrange(pixmapWidth):
for y in xrange(int(height)):
argb = lineARGB[x + y * pixmapWidth]
image.setPixel(x, y, QtGui.qRgba(argb[1], argb[2], argb[3], argb[0]))
return image
