User manual

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Instruction set

3.2. Graphic functions

Besides textual functionality, LCD-Term offers a set of sequences that can be used for

drawing. Simple forms such as lines, rectangles and circles can be filled with different

patterns, text can be positioned on a per pixel basis instead of a per character one, a

screen can be prepared in a back buffer page and being blit to the front buffer. Icons and

special symbols are supported through the GIF feature.

Most of the functions are not shown on screen directly but rendered into one of the two

back buffers. This allows to set a screen up without bothering the user with multiple

updates of the same region (e.g. when drawing something on top of an image). There is

a function controlling and forcing the screen update which can be called after rendering

the back buffer is finished.

Command Description Example LUA string

Graphic primitives

x Sets or clears a pixel at position [y; x].

The third parameter c decides wheter

the pixel is set (c > 0) or cleared (c =

0).

ESC[y;x;cx

ESC[10;40;1x

"\27[10;20;1x"

y Draw a line from [y0; x0] to [y1;

x1]. The last parameter p specifies

a repeating pattern where each bit

corresponds with a pixel. A set bit

results in a set pixel.

ESC[y0;x0;y1;x1;py

ESC[0;0;63;127;255y

"\27[63;0;0;127;85y"

v Draw a rectangle from [y0; x0] to [y1;

x1]. The last parameter p specifies a

repeating pattern to be used for the

rectangle's outlines.

ESC[y0;x0;y1;x1;pv

ESC[0;0;63;127;15v

"\27[63;0;0;

127;111v"

w Fill a rectangle from [y0; x0] to [y1;

x1]. The last parameter p (0-15) is the

number of one of sixteen fill pattern.

ESC[y0;x0;y1;x1;pw

ESC[0;0;63;127;7w

"\27[62;1;1;126;3w"

k Draw/fill a circle with center [y; x]

and radius r. Parameter fill selects

wheter p is a fill (fill = 1) or an

outline pattern.

ESC[y;x;r;fill;pk

ESC[32;64;20;1;7k

"\27[32;64;30;0;

111k"

Graphic cursor

G Set graphic cursor to pixel coordinates

[y; x]. GIFs and text functions as well

as printing strings work relative to

this position.

ESC[y;xG ESC[10;30G "\27[57;100G"

GIF support

Y Display GIF num at current graphic

cursor position.

ESC[numY ESC[1Y "\27[3Y"

Buffers and blitting

V Switch to buffer num. All further

drawing is done in the selected buffer.

ESC[numV ESC[0V "\27[1V"