Error Message: Invalid Cast: Number >> Single

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Permalink Reply by David Rutten on January 17, 2014 at 9:28am

pManager.AddNumberParameter("", "", "", GH_ParamAccess.item, 0.0f);

when you append an 'f' to a number, it turns it into a single precision floating point number. The Number parameter uses double precision numbers. Get rid of the f and it should work.

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David Rutten

david@mcneel.com

Permalink Reply by David Rutten on January 17, 2014 at 10:30am

Don't use floats at all would be my suggestion. The only time when you actually need them is when you are doing floating point graphics stuff, which is often only single precision.

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David Rutten

david@mcneel.com

Permalink Reply by David Rutten on January 17, 2014 at 10:47am

But those floats will only exist within your SolveInstance function, you should not output them or input them.

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David Rutten

david@mcneel.com

Permalink Reply by David Rutten on January 17, 2014 at 11:28am

someFloatValue can be either a float or a double. If it's a double, you have to convert the argument to DrawString into a float first.

If you input a double for offsetting, my recommendation is thus:

in RegisterInputParams:

  pManager.AddNumberParameter("Text Offset", "O", "blh", 0.0);

in SolveInstance:

  double textOffset;

  DA.GetData(?, textOffset);

  float offset = Convert.ToSingle(textOffset);

  ...

  DrawString(..., X + offset);

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David Rutten

david@mcneel.com