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Lcd Functions

Lcd Functions Overview

Description

Lcd functions allow scripts to interact with the transmitter display. This access is limited to the run function of One-Time and Telemetry scripts, and the refresh function of Widget scripts on radios with color display.

Notes:

The run function is periodically called when the screen is visible. In OpenTX 2.0 each invocation starts with a blank screen (unless lcd.lock() is used). Under OpenTX 2.1 screen state is always persisted across calls to the run function. Many scripts originally written for OpenTX 2.0 require a call to lcd.clear() at the beginning of their run function in order to display properly under 2.1 and 2.2.

For Widget scripts, lcd.clear() is not needed, as each invocation starts with a blank screen showing the theme background. But it can be used to overwrite the theme background with another color by calling lcd.clear(color).

Please see above for a description of the constants for flags and patterns, colors, and screen size that can be used with lcd drawing functions.

lcd.RGB(r, g, b | rgb)

Returns a drawing flag with RGB color code

@status current Introduced in 2.2.0

Parameters

r (integer) a number between 0 and 255 that expresses the amount of red in the color
g (integer) a number between 0 and 255 that expresses the amount of green in the color
b (integer) a number between 0 and 255 that expresses the amount of blue in the color
rgb (integer) a number between 0 and 0xFFFFFF that expresses the RGB value (0xFF0000=RED, 0x00FF00=GREEN, 0x0000FF=BLUE)

Return value

flag with RGB565 color

Notice

Only available on radios with color display. Use either lcd.RGB(r,g,b) or lcd.RGB(rgb).

lcd.clear([color])

Clear the LCD screen

@status current Introduced in 2.0.0, color parameter introduced in 2.2.0 RC12

Parameters

color (optional, only on color screens)

Return value

none

lcd.drawAnnulus(x, y, r1, r2, start, end [, flags])

Draw an arc

@status current Introduced in 2.4.0

Parameters

x,y (positive numbers) coordinates of the center
r1,r2 (positive numbers) radii of the inside and outside of the annulus
start,end (positive numbers) start and end of the annulus
flags (optional) please see flags and color constants

Return value

none

lcd.drawArc(x, y, r, start, end [, flags])

Draw an arc

@status current Introduced in 2.4.0

Parameters

x,y (positive numbers) coordinates of the center
r (positive number) radius
start,end (positive numbers) start and end of the arc
flags (optional) please see flags and color constants

Return value

none

lcd.drawBitmap(bitmap, x, y [, scale])

Displays a bitmap at (x,y)

@status current Introduced in 2.2.0

Parameters

bitmap (pointer) point to a bitmap previously opened with Bitmap.open()
x,y (positive numbers) starting coordinates
scale (positive numbers) scale in %, 50 divides size by two, 100 is unchanged, 200 doubles size. Omitting scale draws image in 1:1 scale and is faster than specifying 100 for scale.

Return value

none

Notice

Only available on Horus

lcd.drawChannel(x, y, source, flags)

Display a telemetry value at (x,y)

@status current Introduced in 2.0.6, changed in 2.1.0 (only telemetry sources are valid)

Parameters

x,y (positive numbers) starting coordinate
source can be a source identifier (number) or a source name (string). See getValue()
flags (optional) please see flags and color constants

Return value

none

lcd.drawCircle(x, y, r [, flags])

Draw a circle at (x, y) of specified radius

@status current Introduced in 2.4.0

Parameters

x,y (positive numbers) center position
r (number) radius in pixels
flags (optional) please see flags and color constants

Return value

none

lcd.drawCombobox(x, y, w, list, idx [, flags])

Draw a combo box

@status current Introduced in 2.0.0

Parameters

x,y (positive numbers) top left corner position
w (number) width of combo box in pixels
list (table) combo box elements, each element is a string
idx (integer) index of entry to highlight
flags (unsigned number) drawing flags, the flags can not be combined:
- BLINK combo box is expanded
- INVERS combo box collapsed, text inversed
- 0 or not present combo box collapsed, text normal

Return value

none

Notice

Only available on Taranis

lcd.drawFilledCircle(x, y, r [, flags])

Draw a filled circle at (x, y) of specified radius

@status current Introduced in 2.4.0

Parameters

x,y (positive numbers) center position
r (number) radius in pixels
flags (optional) please see flags and color constants

Return value

none

lcd.drawFilledRectangle(x, y, w, h [, flags])

Draw a solid rectangle from top left corner (x,y) of specified width and height

@status current Introduced in 2.0.0

Parameters

x,y (positive numbers) top left corner position
w (number) width in pixels
h (number) height in pixels
flags (optional) please see flags and color constants
opacity (number) opacity defaults to 0 (only on Horus)

Return value

none

lcd.drawFilledTriangle(x1, y1, x2, y2, x3, y3 [, flags])

Draw a filled triangle

@status current Introduced in 2.4.0

Parameters

x1,y1,x2,y2,x3,y3 (positive numbers) coordinates of the three vertices
flags (optional) please see flags and color constants

Return value

none

lcd.drawGauge(x, y, w, h, fill, maxfill [, flags])

Draw a simple gauge that is filled based upon fill value

@status current Introduced in 2.0.0, changed in 2.2.0

Parameters

x,y (positive numbers) top left corner position
w (number) width in pixels
h (number) height in pixels
fill (number) amount of fill to apply
maxfill (number) total value of fill
flags (optional) please see flags and color constants

Return value

none

lcd.drawHudRectangle(pitch, roll, xmin, xmax, ymin, ymax [, flags])

Draw a rectangle in perspective

@status current Introduced in 2.4.0

Parameters

pitch,roll (positive numbers) pitch and roll to define the orientation of the rectangle
xmin,xmax,ymin,ymax (positive numbers) the limits of the rectangle
flags (optional) please see flags and color constants

Return value

none

lcd.drawLine(x1, y1, x2, y2, pattern, flags)

Draw a straight line on LCD

@status current Introduced in 2.0.0, flags introduced in 2.3.6

Parameters

x1,y1 (positive numbers) starting coordinate
x2,y2 (positive numbers) end coordinate
pattern SOLID or DOTTED
flags (optional) please see flags and color constants

Return value

none

Notice

If the start or the end of the line is outside the LCD dimensions, then the whole line will not be drawn (starting from OpenTX 2.1.5)

lcd.drawLineWithClipping(x1, y1, x2, y2, xmin, xmax, ymin, ymax, pattern [, flags])

Draw a line only inside a rectangle

@status current Introduced in 2.4.0

Parameters

x1,y1,x2,y1 (positive numbers) coordinates of the start and end of the unclipped line
xmin,xmax,ymin,ymax (positive numbers) the limits of the rectangle inside which the line is drawn
pattern (FORCE, ERASE, DOTTED) please see Lcd functions overview
flags (optional) please see flags and color constants

Return value

none

lcd.drawNumber(x, y, value [, flags [, inversColor]])

Display a number at (x,y)

@status current Introduced in 2.0.0

Parameters

x,y (positive numbers) starting coordinate
value (number) value to display
flags (optional) please see flags and color constants
inversColor (optional with INVERS flag) overrides the inverse text color for INVERS

Return value

none

lcd.drawPie(x, y, r, start, end [, flags])

Draw a pie slice

@status current Introduced in 2.4.0

Parameters

x,y (positive numbers) coordinates of the center
r (positive number) radius
start,end (positive numbers) start and end of the pie slice
flags (optional) please see flags and color constants

Return value

none

lcd.drawPixmap(x, y, name)

Draw a bitmap at (x,y)

@status current Introduced in 2.0.0

Parameters

x,y (positive numbers) starting coordinates
name (string) full path to the bitmap on SD card (i.e. “/IMAGES/test.bmp”)

Return value

none

Notice

Maximum image size is [display width / 2] x [display height] pixels.

lcd.drawPoint(x, y)

Draw a single pixel at (x,y) position

@status current Introduced in 2.0.0

Parameters

x (positive number) x position
y (positive number) y position
flags (optional) please see flags and color constants

Return value

none

Notice

Taranis has an LCD display width of 212 pixels and height of 64 pixels. Position (0,0) is at top left. Y axis is negative, top line is 0, bottom line is 63. Drawing on an existing black pixel produces white pixel (TODO check this!)

lcd.drawRectangle(x, y, w, h [, flags [, t]])

Draw a rectangle from top left corner (x,y) of specified width and height

@status current Introduced in 2.0.0, changed in 2.2.0

Parameters

x,y (positive numbers) top left corner position
w (number) width in pixels
h (number) height in pixels
flags (optional) please see and constants
t (number) thickness in pixels, defaults to 1 (only on Horus)
opacity (number) opacity defaults to 0 (only on Horus)

Return value

none

lcd.drawScreenTitle(title, page, pages)

Draw a title bar

@status current Introduced in 2.0.0

Parameters

title (string) text for the title
page (number) page number
pages (number) total number of pages. Only used as indicator on the right side of title bar. (i.e. idx=2, cnt=5, display 2/5)

Return value

none

Notice

Only available on Taranis

lcd.drawSource(x, y, source [, flags])

Displays the name of the corresponding input as defined by the source at (x,y)

@status current Introduced in 2.0.0

Parameters

x,y (positive numbers) starting coordinate
source (number) source index
flags (optional) please see flags and color constants

Return value

none

lcd.drawSwitch(x, y, switch, flags)

Draw a text representation of switch at (x,y)

@status current Introduced in 2.0.0

Parameters

x,y (positive numbers) starting coordinate
switch (number) number of switch to display, negative number displays negated switch
flags (optional) please see flags constants, only SMLSIZE, BLINK and INVERS.

Return value

none

lcd.drawText(x, y, text [, flags [, inversColor]])

Draw a text beginning at (x,y)

@status current Introduced in 2.0.0, SHADOWED introduced in 2.2.1

Parameters

x,y (positive numbers) starting coordinate
text (string) text to display
flags (optional) please see flags and color constants for drawing flags and colors, and Appendix for available characters in each font set.
inversColor (optional with the INVERS flag) overrides the inverse text color for INVERS

Return value

none

lcd.drawTextLines(x, y, w, h, text [, flags])

Draw text inside rectangle (x,y,w,h) with line breaks

@status current Introduced in 2.5.0

Parameters

x,y (positive numbers) starting coordinate
w,h (positive numbers) width and height of bounding rectangle
text (string) text to display
flags (optional) please see Lcd functions overview for drawing flags and colors, and Appendix for available characters in each font set. RIGHT, CENTER and VCENTER are not implemented.

Return value

none

lcd.drawTimer(x, y, value [, flags [, inversColor]])

Display a value formatted as time at (x,y)

@status current Introduced in 2.0.0

Parameters

x,y (positive numbers) starting coordinate
value (number) time in seconds
flags (optional) please see flags and color constants
inversColor (optional with INVERS flag) overrides the inverse text color for INVERS

Return value

none

lcd.drawTriangle(x1, y1, x2, y2, x3, y3 [, flags])

Draw a triangle

@status current Introduced in 2.4.0

Parameters

x1,y1,x2,y2,x3,y3 (positive numbers) coordinates of the three vertices
flags (optional) please see flags and color constants

Return value

none

lcd.exitFullScreen()

Exit full screen widget mode.

@status current Introduced in 2.5.0

Notice

Only available on radios with color display

lcd.getColor(flags)

Get the color value from flags

@status current Introduced in 2.3.11

Parameters

flags (flags) please see flags and color constants

Return value

color (flag) only the RGB565 color value of the input

Notice

Only available on radios with color display

lcd.getLastLeftPos()

Returns the leftmost x position from previous drawtext or drawNumber output

@status current Introduced in 2.2.0

Parameters

none

Return value

number (integer) x position

Notice

Only available on Taranis

lcd.getLastPos()

Returns the rightmost x position from previous output

@status current Introduced in 2.0.0

Parameters

none

Return value

number (integer) x position

Notice

Only available on Taranis

For added clarity, it is recommended to use lcd.getLastRightPos()

lcd.getLastRightPos()

Returns the rightest x position from previous drawtext or drawNumber output

@status current Introduced in 2.2.0

Parameters

none

Return value

number (integer) x position

Notice

Only available on Taranis

This is strictly equivalent to former lcd.getLastPos()

lcd.refresh()

Refresh the LCD screen

From 2.4.0 on color LCDs, this is done automatically when the screen needs to be refreshed (on events and depending on refresh period).

@status current Only used on non-color LCDs.

Parameters

none

Return value

none

lcd.resetBacklightTimeout()

Reset the backlight timeout

@status current Introduced in 2.3.6

Parameters

none

Return value

none

lcd.setColor(colorIndex, color)

Change an indexed color (theme colors and CUSTOM_COLOR).

@status current Introduced in 2.2.0

Notice

Changing theme colors affects not only other Lua widgets, but the entire radio interface.
Only available on radios with color display

Parameters

colorIndex (flags) must be an indexed color, please see color constants.
color (flags) please see color constants.

Return value

none

Notice

Only available on radios with color display

lcd.sizeText(text [, flags])

Get the width and height of a text string drawn with flags

@status current Introduced in 2.5.0

Parameters

text (string)
flags (optional) please see flags and color constants

Return value

w,h (integers) width and height of the text