def draw(self, state, plotCoordinates, plotDefinitions, performanceTable):
"""Draw the plot element.
This stage consists of creating an SVG image of the
pre-computed data.
@type state: ad-hoc Python object
@param state: State information that persists long enough to use quantities computed in C{prepare} in the C{draw} stage. This is a work-around of lxml's refusal to let its Python instances maintain C{self} and it is unrelated to DataTableState.
@type plotCoordinates: PlotCoordinates
@param plotCoordinates: The coordinate system in which this plot element will be placed.
@type plotDefinitions: PlotDefinitions
@type plotDefinitions: The dictionary of key-value pairs that forms the <defs> section of the SVG document.
@type performanceTable: PerformanceTable
@param performanceTable: Measures and records performance (time and memory consumption) of the drawing process.
@rtype: SvgBinding
@return: An SVG fragment representing the fully drawn plot element.
"""
svg = SvgBinding.elementMaker
svgId = self.get("svgId")
if svgId is None:
output = svg.g()
else:
output = svg.g(id=svgId)
if not hasattr(plotCoordinates, "zmin"):
return output
performanceTable.begin("PlotHeatMap draw")
xbins = state.xbins
xlow = state.xlow
xhigh = state.xhigh
ybins = state.ybins
ylow = state.ylow
yhigh = state.yhigh
reddata = NP("empty", len(state.zdata), dtype=NP.uint8)
greendata = NP("empty", len(state.zdata), dtype=NP.uint8)
bluedata = NP("empty", len(state.zdata), dtype=NP.uint8)
alphadata = NP("empty", len(state.zdata), dtype=NP.uint8)
if len(plotCoordinates.gradient) == 0:
offsets = [0.0, 1.0]
reds = [255, 0]
greens = [255, 0]
blues = [255, 255]
alphas = [255, 255]
else:
offsets = [float(g["offset"]) for g in plotCoordinates.gradient]
reds = [
min(int(math.floor(256 * float(g["red"]))), 255)
for g in plotCoordinates.gradient
]
greens = [
min(int(math.floor(256 * float(g["green"]))), 255)
for g in plotCoordinates.gradient
]
blues = [
min(int(math.floor(256 * float(g["blue"]))), 255)
for g in plotCoordinates.gradient
]
alphas = [
min(int(math.floor(256 * float(g.get("opacity", 1.0)))), 255)
for g in plotCoordinates.gradient
]
if not plotCoordinates.zlog:
normalized = NP(
NP(state.zdata - plotCoordinates.zmin) /
(plotCoordinates.zmax - plotCoordinates.zmin))
else:
normalized = NP(
NP(
NP("log10", state.zdata) -
NP("log10", plotCoordinates.zmin)) / NP(
NP("log10", plotCoordinates.zmax) -
NP("log10", plotCoordinates.zmin)))
for index in xrange(len(offsets) - 1):
if index == 0:
under = NP(normalized < offsets[index])
reddata[under] = reds[index]
greendata[under] = greens[index]
bluedata[under] = blues[index]
alphadata[under] = alphas[index]
if index == len(offsets) - 2:
over = NP(normalized >= offsets[index + 1])
reddata[over] = reds[index + 1]
greendata[over] = greens[index + 1]
bluedata[over] = blues[index + 1]
alphadata[over] = alphas[index + 1]
selection = NP(normalized >= offsets[index])
NP("logical_and", selection, NP(normalized < offsets[index + 1]),
selection)
subset = NP(NP(normalized[selection]) - offsets[index])
norm = 1. / (offsets[index + 1] - offsets[index])
reddata[selection] = NP(
"array",
NP(
NP(subset * ((reds[index + 1] - reds[index]) * norm)) +
reds[index]),
dtype=NP.uint8)
greendata[selection] = NP(
"array",
NP(
NP(subset * ((greens[index + 1] - greens[index]) * norm)) +
greens[index]),
dtype=NP.uint8)
bluedata[selection] = NP(
"array",
NP(
NP(subset * ((blues[index + 1] - blues[index]) * norm)) +
blues[index]),
dtype=NP.uint8)
alphadata[selection] = NP(
"array",
NP(
NP(subset * ((alphas[index + 1] - alphas[index]) * norm)) +
alphas[index]),
dtype=NP.uint8)
badpixels = NP("isnan", normalized)
NP("logical_or", badpixels, NP("isinf", normalized), badpixels)
if state.zmask is not None:
NP("logical_or", badpixels, NP(state.zmask != defs.VALID),
badpixels)
alphadata[badpixels] = 0
X1, Y1 = plotCoordinates(xlow, ylow)
X2, Y2 = plotCoordinates(xhigh, yhigh)
onePixelBeyondBorder = self.get("onePixelBeyondBorder",
defaultFromXsd=True,
convertType=True)
if onePixelBeyondBorder:
Xwidth = (X2 - X1) / xbins
Yheight = (Y1 - Y2) / ybins
X1 -= Xwidth
X2 += Xwidth
Y1 += Yheight
Y2 -= Yheight
arrayToPng = ArrayToPng()
arrayToPng.putdata(xbins,
ybins,
reddata,
greendata,
bluedata,
alphadata,
flipy=True,
onePixelBeyondBorder=onePixelBeyondBorder)
output.append(
svg.image(
**{
defs.XLINK_HREF:
"data:image/png;base64," + arrayToPng.b64encode(),
"x":
repr(X1),
"y":
repr(Y2),
"width":
repr(X2 - X1),
"height":
repr(Y1 - Y2),
"image-rendering":
self.get("imageRendering", defaultFromXsd=True),
"preserveAspectRatio":
"none"
}))
performanceTable.end("PlotHeatMap draw")
return output
if makingImage:
betterMask = mask > 0
for i in xrange(rgbDouble.shape[0]):
numpy.logical_and(betterMask, rgbDouble[i,:,:] > 0.0, betterMask)
reddata = numpy.maximum(numpy.minimum(numpy.uint8(rgbDouble[0,:,:].T/rgbDouble[0,:,:].max() * 255.0), 255), 0)
greendata = numpy.maximum(numpy.minimum(numpy.uint8(rgbDouble[1,:,:].T/rgbDouble[1,:,:].max() * 255.0), 255), 0)
bluedata = numpy.maximum(numpy.minimum(numpy.uint8(rgbDouble[2,:,:].T/rgbDouble[2,:,:].max() * 255.0), 255), 0)
alphadata = numpy.uint8(betterMask.T * 255)
reddata = numpy.reshape(reddata, rgbDouble.shape[1] * rgbDouble.shape[2])
greendata = numpy.reshape(greendata, rgbDouble.shape[1] * rgbDouble.shape[2])
bluedata = numpy.reshape(bluedata, rgbDouble.shape[1] * rgbDouble.shape[2])
alphadata = numpy.reshape(alphadata, rgbDouble.shape[1] * rgbDouble.shape[2])
arrayToPng = ArrayToPng()
arrayToPng.putdata(rgbDouble.shape[1], rgbDouble.shape[2], reddata, greendata, bluedata, alphadata, flipy=False, onePixelBeyondBorder=False)
attrib = {"version": "1.1", "width": "100%", "height": "100%", "preserveAspectRatio": "xMidYMin meet"}
attrib["viewBox"] = "0 0 %d %d" % (rgbDouble.shape[2], rgbDouble.shape[1])
attrib["style"] = "fill: none; stroke: black; stroke-linejoin: miter; stroke-width: 2; text-anchor: middle;"
attrib["font-family"] = "DejaVu Sans Condensed, DejaVu Sans, Lucida Sans Unicode, Lucida Sans, Helvetica, Sans, sans-serif"
attrib["font-weight"] = "normal"
imagePlot = SVG.svg(SVG.g(), **attrib)
imageGroup = imagePlot[0]
imageGroup.append(SVG.image(**{defs.XLINK_HREF: "data:image/png;base64," + arrayToPng.b64encode(), "x": "0", "y": "0", "width": repr(rgbDouble.shape[1]), "height": repr(rgbDouble.shape[2])}))
getLngLat = utilities.makeGetLngLat(imageValue["metadata"])
wavelengths = imageValue["metadata"]["bandWavelength"]
bandNames = imageValue["metadata"]["bandNames"]
def draw(self, state, plotCoordinates, plotDefinitions, performanceTable):
"""Draw the plot element.
This stage consists of creating an SVG image of the
pre-computed data.
@type state: ad-hoc Python object
@param state: State information that persists long enough to use quantities computed in C{prepare} in the C{draw} stage. This is a work-around of lxml's refusal to let its Python instances maintain C{self} and it is unrelated to DataTableState.
@type plotCoordinates: PlotCoordinates
@param plotCoordinates: The coordinate system in which this plot element will be placed.
@type plotDefinitions: PlotDefinitions
@type plotDefinitions: The dictionary of key-value pairs that forms the <defs> section of the SVG document.
@type performanceTable: PerformanceTable
@param performanceTable: Measures and records performance (time and memory consumption) of the drawing process.
@rtype: SvgBinding
@return: An SVG fragment representing the fully drawn plot element.
"""
svg = SvgBinding.elementMaker
svgId = self.get("svgId")
if svgId is None:
output = svg.g()
else:
output = svg.g(id=svgId)
if not hasattr(plotCoordinates, "zmin"):
return output
performanceTable.begin("PlotHeatMap draw")
xbins = state.xbins
xlow = state.xlow
xhigh = state.xhigh
ybins = state.ybins
ylow = state.ylow
yhigh = state.yhigh
reddata = NP("empty", len(state.zdata), dtype=NP.uint8)
greendata = NP("empty", len(state.zdata), dtype=NP.uint8)
bluedata = NP("empty", len(state.zdata), dtype=NP.uint8)
alphadata = NP("empty", len(state.zdata), dtype=NP.uint8)
if len(plotCoordinates.gradient) == 0:
offsets = [0.0, 1.0]
reds = [255, 0]
greens = [255, 0]
blues = [255, 255]
alphas = [255, 255]
else:
offsets = [float(g["offset"]) for g in plotCoordinates.gradient]
reds = [min(int(math.floor(256*float(g["red"]))), 255) for g in plotCoordinates.gradient]
greens = [min(int(math.floor(256*float(g["green"]))), 255) for g in plotCoordinates.gradient]
blues = [min(int(math.floor(256*float(g["blue"]))), 255) for g in plotCoordinates.gradient]
alphas = [min(int(math.floor(256*float(g.get("opacity", 1.0)))), 255) for g in plotCoordinates.gradient]
if not plotCoordinates.zlog:
normalized = NP(NP(state.zdata - plotCoordinates.zmin) / (plotCoordinates.zmax - plotCoordinates.zmin))
else:
normalized = NP(NP(NP("log10", state.zdata) - NP("log10", plotCoordinates.zmin))/NP(NP("log10", plotCoordinates.zmax) - NP("log10", plotCoordinates.zmin)))
for index in xrange(len(offsets) - 1):
if index == 0:
under = NP(normalized < offsets[index])
reddata[under] = reds[index]
greendata[under] = greens[index]
bluedata[under] = blues[index]
alphadata[under] = alphas[index]
if index == len(offsets) - 2:
over = NP(normalized >= offsets[index + 1])
reddata[over] = reds[index + 1]
greendata[over] = greens[index + 1]
bluedata[over] = blues[index + 1]
alphadata[over] = alphas[index + 1]
selection = NP(normalized >= offsets[index])
NP("logical_and", selection, NP(normalized < offsets[index + 1]), selection)
subset = NP(NP(normalized[selection]) - offsets[index])
norm = 1. / (offsets[index + 1] - offsets[index])
reddata[selection] = NP("array", NP(NP(subset * ((reds[index + 1] - reds[index]) * norm)) + reds[index]), dtype=NP.uint8)
greendata[selection] = NP("array", NP(NP(subset * ((greens[index + 1] - greens[index]) * norm)) + greens[index]), dtype=NP.uint8)
bluedata[selection] = NP("array", NP(NP(subset * ((blues[index + 1] - blues[index]) * norm)) + blues[index]), dtype=NP.uint8)
alphadata[selection] = NP("array", NP(NP(subset * ((alphas[index + 1] - alphas[index]) * norm)) + alphas[index]), dtype=NP.uint8)
badpixels = NP("isnan", normalized)
NP("logical_or", badpixels, NP("isinf", normalized), badpixels)
if state.zmask is not None:
NP("logical_or", badpixels, NP(state.zmask != defs.VALID), badpixels)
alphadata[badpixels] = 0
X1, Y1 = plotCoordinates(xlow, ylow)
X2, Y2 = plotCoordinates(xhigh, yhigh)
onePixelBeyondBorder = self.get("onePixelBeyondBorder", defaultFromXsd=True, convertType=True)
if onePixelBeyondBorder:
Xwidth = (X2 - X1) / xbins
Yheight = (Y1 - Y2) / ybins
X1 -= Xwidth
X2 += Xwidth
Y1 += Yheight
Y2 -= Yheight
arrayToPng = ArrayToPng()
arrayToPng.putdata(xbins, ybins, reddata, greendata, bluedata, alphadata, flipy=True, onePixelBeyondBorder=onePixelBeyondBorder)
output.append(svg.image(**{defs.XLINK_HREF: "data:image/png;base64," + arrayToPng.b64encode(), "x": repr(X1), "y": repr(Y2), "width": repr(X2 - X1), "height": repr(Y1 - Y2), "image-rendering": self.get("imageRendering", defaultFromXsd=True), "preserveAspectRatio": "none"}))
performanceTable.end("PlotHeatMap draw")
return output