# ncl_tdez2d man page

TDEZ2D — Provides a simplified interface to TDPACK for drawing surfaces.

## Synopsis

CALL TDEZ2D(NX,NY,X,Y,Z,RMULT,THETA,PHI,IST)

## C-Binding Synopsis

#include <ncarg/ncargC.h>

void c_tdez3d (int nx, int ny, int nz, float *x, float *y,

float *z, float *u, float value, float rmult,

float theta, float phi, int ist)

## Description

The arguments of TDEZ2D are as follows:

- NX
- (an input constant or variable of type INTEGER) - The size of the input array X below.
- NY
- (an input constant or variable of type INTEGER) - The size of the input array Y below.
- X
- (an input array variable of type REAL) - A 1-dimensional array specifying X-coordinate values.
- Y
- (an input array variable of type REAL) - A 1-dimensional array specifying Y-coordinate values.
- Z
- (an input array variable of type REAL) - An array NX by NY containing the surface to be drawn. Z(I,J) is a functional value at coordiante (X(I),Y(J)) for I=1,NX and J=1,NY.
- RMULT
- (an input constant or variable of type REAL) - A multiplier of the diagonal length (DL) of the smallest box containing the surface to be drawn. Together with THETA and PHI (defined below), RMULT is used to determine the eye position (see Usage).
- THETA
- (an input constant or variable of type REAL) - An angle (in degrees) in the XY plane measured positive counter-clockwise from the X axis. Together with RMULT (defined above) and PHI (defined below), THETA is used to determine the eye position (see Usage).
- PHI
- (an input constant or variable of type REAL) - An angle (in degrees) measured from the positive Z axis toward the XY plane. Together with RMULT and THETA (defined above), PHI is used to determine the eye position (see Usage).
- IST
(an input constant or variable of type INTEGER) - A style index defining the colors used to shade the surface as per:

1 - wire frame

2 - gray shades underneath; gray shades on top.

3 - gray shades underneath; red shades on top.

4 - gray shades underneath; green shades on top.

5 - gray shades underneath; blue shades on top.

6 - gray shades underneath; cyan shades on top.

7 - gray shades underneath; magenta shades on top.

8 - gray shades underneath; yellow shades on top.IST is positive, then black is used for the background or and white for the foreground color; if IST is negative of any of the above values, then white used for the background color and black for the eground color.

If the value for IST falls outside the legal range, it is defaulted to 6.

## C-Binding Description

The C-binding argument descriptions are the same as the FORTRAN argument descriptions.

## Usage

The coordinate (RMULT*DL,THETA,PHI) is the spherical coordinate for the eye position. If RMULT = THETA = PHI = 0., a default eye position ( 2.5,-55.,70.) is chosen. The point looked at is calculated to be the center of the surface.

TDEZ2D does not call FRAME.

If the image is too small, decrease the size of RMULT; if the image is too large, increase the size of RMULT.

When TDEZ2D is called, a color table is defined for all open workstations that implements IST as described above. *This color table will supersede any color table that has been previously defined.* The color table that is defined is:

```
Color
index Colors
------- ----------------------------------------------------
0 black if IST is positive; white if IST is negative
1 white if IST is positive; black if IST is negative
2 red
3 green
4 blue
5 cyan
6 magenta
7 yellow
8- 37 grayscale from white to black.
38- 67 shades of gray
68- 97 shades of red
98-127 shades of green
128-157 shades of blue
158-187 shades of cyan
188-217 shades of magenta
218-247 shades of yellow
```

## Access

To use TDEZ2D or c_tdez2d, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in that order.

## See Also

Online: tdclrs, tdctri, tddtri, tdgeti, tdgetr, tdgrds, tdgrid, tdgtrs, tdinit, tditri, tdlbla, tdlbls, tdline, tdlnpa, tdmtri, tdotri, tdpack, tdpack_params, tdpara, tdplch, tdprpa, tdprpi, tdprpt, tdsetr, tdsort, tdstri, tdstrs, tdez3d

## Copyright

Copyright (C) 1987-2009

University Corporation for Atmospheric Research

The use of this Software is governed by a License Agreement.