XaoS online help - Line drawing functions
Description: XaoS, realtime, fractal, zoomer

# Line drawing functions

XaoS has support for drawing lines. These functions are available only in animations and could be used to show some parts of fractals or draw simple diagrams. See the tutorial "Introduction to fractals" for examples of this feature.

Lines can be drawn in screen coordinates, where 0,0 is the top left corner and 1,1 is bottom right, scaled coordinates, which are similar, but scaled to keep 0,0--1,1 rectangular, or Fractal coordinates, to draw a line at an exact position on the screen.

The color of the line should be specified by the `color` command. You might draw an arbitrary number of lines and, later, morph them. Each line is identified by a unique numeric key; the current key can be set using `linekey`. Commands for changing lines operate on the line with the current key. (Lines drawn in sequence have consecutive numbers.)

For example:

`(color 'red)
(line 'scaled 0.3 0.5 0.7 0.5)
(line 'scaled 0.3 0.5 0.7 0.5)
(line 'scaled 0.3 0.5 0.3 0.5)
(line 'scaled 0.7 0.5 0.7 0.5)
(linekey 0)
(morphline 'scaled 0.3 0.3 0.7 0.3)
(morphline 'scaled 0.3 0.7 0.7 0.7)
(morphline 'scaled 0.3 0.3 0.3 0.7)
(morphline 'scaled 0.7 0.3 0.7 0.7)
(usleep 1000000)
`

Creates line morphing to rectangle.

Draw line

Morph line

Morph last line

Set line key

Clear line

Clear all lines