drawLine.md

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

Draws a straight line on LCD

@status current Introduced in 2.0.0

Parameters

• x1,y1 (positive numbers) starting coordinate

• x2,y2 (positive numbers) end coordinate

• pattern TODO

• flags TODO

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)

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Examples

lcd/drawLine-example

local alpha = (2 * math.pi) / 10

local function getPoint(centerX, centerY, radius, point)
  local omega = alpha * point
  local r = radius*(point % 2 + 1)/2
  local X = (r * math.sin(omega)) + centerX
  local Y = (r * math.cos(omega)) + centerY
  return X, Y
end

local function drawStar(centerX, centerY, radius, pattern, flags)
  local point = 10
  local startX, startY = getPoint(centerX, centerY, radius, point)
  for point = 1, 10 do
    local nextX, nextY = getPoint(centerX, centerY, radius, point)
    lcd.drawLine(startX, startY, nextX, nextY, pattern, flags)
    startX = nextX
    startY = nextY
  end
end

local function run(event)
  lcd.clear()
  lcd.drawText(1,1,"drawLine() example", 0)
  drawStar(30, 35, 25, SOLID, FORCE)
  drawStar(30, 35, 20, DOTTED, FORCE)
  drawStar(30, 35, 15, SOLID, FORCE)
end

return{run=run}