plptex: Write text inside the viewport

The PLplot Plotting Library: Programmer's Reference Manual
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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.

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