plptex: Write text inside the viewport

`plptex`: Write text inside the viewport
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#### `plptex`: Write text inside the viewport

`plptex (` | x,
| y,
| dx,
| dy,
| just,
| text`)`;

Writes text at a specified position and inclination within the viewport. Text is clipped at the viewport boundaries. The reference point of a string lies along a line passing through the string at half the height of a capital letter. The position of the reference point along this line is determined by ``just``, the reference point is placed at world coordinates `(`x`, `y`)` within the viewport. The inclination of the string is specified in terms of differences of world coordinates making it easy to write text parallel to a line in a graph.

`x` (`PLFLT`, input)

  x coordinate of reference point of string.

`y` (`PLFLT`, input)

  y coordinate of reference point of string.

`dx` (`PLFLT`, input)

  Together with ``dy``, this specifies the inclination of the string. The baseline of the string is parallel to a line joining `(`x`, `y`)` to `(`x`+`dx`, `y`+`dy`)`.

`dy` (`PLFLT`, input)

  Together with ``dx``, this specifies the inclination of the string.

`just` (`PLFLT`, input)

  Specifies the position of the string relative to its reference point. If ``just`=0.`, the reference point is at the left and if ``just`=1.`, it is at the right of the string. Other values of ``just`` give intermediate justifications.

`text` (`const char *`, input)

  The string to be written out.

Redacted form: `plptex(x, y, dx, dy, just, text)`

This function is used in example 2-4,10,12-14,20,23,24,26.

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`plpsty`: Select area fill pattern | Home | `plptex3`: Write text inside the viewport of a 3D plot