.. only:: html .. note:: :class: sphx-glr-download-link-note Click :ref:`here ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_gallery_axisartist_demo_curvelinear_grid2.py: ====================== Demo CurveLinear Grid2 ====================== Custom grid and ticklines. This example demonstrates how to use GridHelperCurveLinear to define custom grids and ticklines by applying a transformation on the grid. As showcase on the plot, a 5x5 matrix is displayed on the axes. .. image:: /gallery/axisartist/images/sphx_glr_demo_curvelinear_grid2_001.png :alt: demo curvelinear grid2 :class: sphx-glr-single-img .. code-block:: default import numpy as np import matplotlib.pyplot as plt from mpl_toolkits.axisartist.grid_helper_curvelinear import ( GridHelperCurveLinear) from mpl_toolkits.axisartist.grid_finder import ( ExtremeFinderSimple, MaxNLocator) from mpl_toolkits.axisartist.axislines import Axes def curvelinear_test1(fig): """Grid for custom transform.""" def tr(x, y): sgn = np.sign(x) x, y = np.abs(np.asarray(x)), np.asarray(y) return sgn*x**.5, y def inv_tr(x, y): sgn = np.sign(x) x, y = np.asarray(x), np.asarray(y) return sgn*x**2, y grid_helper = GridHelperCurveLinear( (tr, inv_tr), extreme_finder=ExtremeFinderSimple(20, 20), # better tick density grid_locator1=MaxNLocator(nbins=6), grid_locator2=MaxNLocator(nbins=6)) ax1 = fig.add_subplot(axes_class=Axes, grid_helper=grid_helper) # ax1 will have a ticks and gridlines defined by the given # transform (+ transData of the Axes). Note that the transform of the Axes # itself (i.e., transData) is not affected by the given transform. ax1.imshow(np.arange(25).reshape(5, 5), vmax=50, cmap=plt.cm.gray_r, origin="lower") if __name__ == "__main__": fig = plt.figure(figsize=(7, 4)) curvelinear_test1(fig) plt.show() .. _sphx_glr_download_gallery_axisartist_demo_curvelinear_grid2.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: demo_curvelinear_grid2.py ` .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: demo_curvelinear_grid2.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature Keywords: matplotlib code example, codex, python plot, pyplot `Gallery generated by Sphinx-Gallery `_