Cannot find grid on the plot I'm trying to read about svg2data

[peterstangl]

Hi @bedaro,
"grid" means in this case only that the code can find ticks and corresponding values on the x and y axes. I see two things the code might not be able to handle:

• The tick values on the x-axis are rotated. The code only looks for unrotated text in the vicinity of the axis ticks. Rotated text might have unrotated coordinates that are too far away from the x-axis to be recognized. This is probably the source of the error message since the code is not able to find the text corresponding to the values on the x-axis.
• The values on the x-axis are not numerical. This is a problem that would still remain even if the code would be able to find the values. At the moment, only numerical values are supported and dates are not recognized.

To solve these problems in the svg file, one could remove the dates on the x-axis and replace them by (unrotated) numerical values.
To solve these problems in the code, the functions that look for the tick values have to be modified to also find rotated text. In addition, the strings describing the dates have to be converted to numerical values.