pltr2: Linear interpolation for grid to world mapping using doubly dimensioned coordinate arrays (row-major order as per normal C 2d arrays)
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pltr2: Linear interpolation for grid to world mapping using doubly dimensioned coordinate arrays (row-major order as per normal C 2d arrays)

pltr2 (x,
 y,
 tx,
 ty,
 pltr_data);
 

Linear interpolation for grid to world mapping using two-dimensional x and y coordinate arrays. This routine can be used for the PLTRANSFORM_callback argument of plcont, plshade, plshades, plimagefr, or plvect.

x (PLFLT, input)

X index of matrix.

y (PLFLT, input)

Y index of matrix.

tx (PLFLT_NC_SCALAR, output)

Transformed x value in world coordinates corresponding to x index of matrix.

ty (PLFLT_NC_SCALAR, output)

Transformed y value in world coordinates corresponding to y index of matrix.

pltr_data (PLPointer, input)

A pointer to additional data that is passed as an argument to PLplot routines that potentially could use the pltr2 callback (i.e., plcont, plimagefr, plshade, plshades, and plvect); which then internally pass that argument on to this callback.

This function is used in C examples 9, 16, 20, and 22.

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pltr1: Linear interpolation for matrix index to world coordinate mapping using singly dimensioned coordinate arrays  Home  plTranslateCursor: Convert device to world coordinates