plottest

Description

plottest.c is a simple test program for the plotlib library. It demonstrates basic usage of plotlib functions to open a plot, draw some lines, display text, and close the plot. It serves as a quick functional check of the plotlib installation and its ability to generate a metafile.

Usage 

plottest

Arguments

None.

How It Works

  1. Initialization: The main function is called.
  2. plot_open(): Calls plot_open() to initialize a plot. It requests a plot area of 10000x10000 units and lets plotlib generate a default filename for the metafile.
  3. Plotting Commands:
    • plot_pen(1): Selects pen number 1.
    • plot_textrot(0): Sets text rotation to 0 degrees.
    • plot_move(5000, 5000): Moves the pen to coordinates (5000, 5000).
    • plot_text("hello mom"): Writes “hello mom” at the current position.
    • plot_pen(2): Selects pen number 2.
    • plot_move(0, 0): Moves to (0, 0).
    • plot_line(10000, 0): Draws a line to (10000, 0).
    • plot_line(10000, 10000): Draws a line to (10000, 10000).
    • plot_pen(3): Selects pen number 3.
    • plot_line(0, 10000): Draws a line to (0, 10000).
    • plot_line(0, 0): Draws a line to (0, 0).
    • plot_move(5000, 5000): Moves to (5000, 5000).
    • plot_textrot(90): Sets text rotation to 90 degrees.
    • plot_pen(4): Selects pen number 4.
    • plot_text("hello dad"): Writes “hello dad”.
    • plot_pen(5): Selects pen number 5.
    • plot_textrot(180): Sets text rotation to 180 degrees.
    • plot_text("hello world"): Writes “hello world”.
  4. plot_close(): Calls plot_close() to finalize and close the plot file.

Output Files

  • A plotlib metafile (e.g., plotfile_0) containing the commands to draw a rectangle with text at various orientations.

Dependencies

  • plotlib.h: For plotlib functions.
  • Standard C library functions for input/output.

Notes

This program serves as a minimal working example and regression test for the plotlib library, ensuring that basic plotting functionality is correctly implemented. It generates a metafile that can then be viewed or converted by plotdriver and its associated device drivers.