lcd.drawLine¶

since 1.1.0

Draw a line.

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

Parameters¶

Name	Type	Required	Description
`x1`	number	yes	X coordinate of the start point
`y1`	number	yes	Y coordinate of the start point
`x2`	number	yes	X coordinate of the end point
`y2`	number	yes	Y coordinate of the end point

Returns¶

Nothing.

Examples¶

-- a simple graph of the last N samples
local function drawGraph(samples, n, x, y, w, h, min, max)
  local step = w / (n - 1)
  local prevX, prevY
  for i = 1, n do
    local v = samples[i] or min
    local px = x + (i - 1) * step
    local py = y + h - (v - min) / (max - min) * h
    if prevX then lcd.drawLine(prevX, prevY, px, py) end
    prevX, prevY = px, py
  end
end

Use lcd.pen(PEN_DOTTED) before drawing for dotted lines (grid lines, thresholds).

Used in¶

Real-world usage¶

Called 133 times across 9 open-source Ethos Lua projects. A few short excerpts:

Example 1Example 2Example 3

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

src/dashx/app/modules/logs/logs_view.lua:279

lcd.drawLine(x - halfW, y, x + halfW, y)

src/ethos-arcade/games/missilecmd/game.lua:1809

lcd.drawLine(cx, cy, playerTipX, playerTipY)

src/ethos-heli-training/games/piro-rate-lock/game.lua:696