Improve python control of Contour plots

[Nick Draper]

From qtiplot handbook:

The plot functions above return a reference to the multilayer plot window. If you need a reference to the spectrogram object itself, you can get it as shown in the example below:

m = newMatrix("TestMatrix", 1000, 800)
m.setFormula("x*y")
m.calculate()
g = plot(m, Layer.ColorMap)
s = g.activeLayer().spectrogram(m)
s.setColorBarWidth(20)
It is possible to fine tune the plots created from a matrix:

m = newMatrix("TestMatrix", 1000, 800)
m.setFormula("x*y")
m.calculate()

s = newGraph().activeLayer().plotSpectrogram(m, Layer.ColorMap)
s.setContourLevels((20.0, 30.0, 60.0, 80.0))
s.setDefaultContourPen(QtGui.QPen(Qt.yellow)) # set global pen for the contour lines
s.setLabelsWhiteOut(True)
s.setLabelsColor(Qt.red)
s.setLabelsFont(QtGui.QFont("Arial", 14))
s.setLabelsRotation(45)
s.showColorScale(Layer.Top)
s.setColorBarWidth(20)
As you have seen earlier, you can set a global pen for the contour lines, using:

s.setDefaultContourPen(QtGui.QPen(Qt.yellow))
You can also assign a specific pen for each contour line, using the function below:

s.setContourLinePen(index, QPen)
or you can automatically set pen colors defined by the color map of the spectrogram:

s.setColorMapPen(bool on = True)
You can also use any of the following functions:

s.setMatrix(Matrix *, bool useFormula = False)
s.setUseMatrixFormula(bool useFormula = True)# calculate data to be drawn using matrix formula (if any)
s.setLevelsNumber(int)
s.showColorScale(int axis, bool on = True)
s.setGrayScale()
s.setDefaultColorMap()
s.setCustomColorMap(LinearColorMap map)
s.showContourLineLabels(bool show = True) # enable/disable contour line labels
s.setLabelsOffset(int x, int y) # offset values for all labels in % of the text size
s.updateData()

[Nick Draper]

Bulk move of tickets at the end of iteration 28

[Nick Draper]

"New" tickets moved at the code freeze of iteration 29

[Nick Draper]

Bulk move of tickets to iteration 31 at the iteration 30 code freeze

[Russell Taylor]

Enable customisation of color fill plots from python. Re #2658.

Changeset: 958d80dc20155300b8989f45c57319438cec3d25

[Russell Taylor]

Documentation has been updated at http://www.mantidproject.org/MantidPlot:_Image_and_Contour_Line_Plots_%28Spectrograms%29

(Note that there are slight differences to the qtiplot commands shown in the description).

[Anders Markvardsen]

Tested the additional exposed plotting functionality from the useful wiki-page. In this process did not come accross anything which did not work

[Stuart Campbell]

This ticket has been transferred to github issue ​3505