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Draws images with lua.

$ draw 'rect(10, 10, 118, 118, red, yellow)' > x.png

Inspired by pico-8. This tool takes lua scripts as strings and writes a png to standard out.

Consider this tool unstable, I'll likely make it read scripts from either standard in, or files, or both, and make arguments no longer the default.

Lua API

set(x, y, c)

Takes an x, y coordinate and sets it to a color.

rgb(r, g, b)

Takes a red, green, and blue value (from 0 to 255 or as floating points from 0 to 1), returns a color value.

The following colors are defined as globals for you:

  • black
  • white
  • red
  • blue
  • yellow
  • green
  • orange
  • purple
  • cyan
  • magenta
  • clear

sin(t)

Returns sine of t, in terms of pi, not degrees.

cos(t)

Returns cosine of t, in terms of pi, not degrees.

tan(t)

Returns tangent of t, in terms of pi, not degrees.

PI

Constant for pi.

rect(x1, y1, x2, y2, bordercolor, fillcolor)

Draws a rectangle from (x1, y1) to (x2, y2) with a border of bordercolor and filled with fillcolor.

circ(x, y, r, bordercolor, fillcolor)

Draws a circle around (x, y) with radius r with a border of bordercolor and filled with fillcolor.

line(x1, y1, x2, y2, color)

Draws a line from (x1, y1) to (x2, y2) in color.

bg(color)

Fills the whole picture with color.

BUGS

Line currently has gaps when the absolute value of the slope is high. I intend to fix that soon.

DEBUGGING

If you set the LM_DEBUG_DRAW env var a debug.gif and debug.log will be created with a frame / logline per event. The env var should be set to a regex that filters events, so . will show all events.