Macro Handler

Macro Handler

Android Automation Platform

Object MethodScanning and Detection

Region:measure(templateOrBuilder, param?)

Measures a target in this region: its box, coverage, patch count and the largest target-free rectangle, read back through getMetrics() on the returned match. Returns nil when the target is absent or its type cannot be measured.

Documented for app version 1.0.51Updated:

Detailed Explanation

This section explains when to use the API, how to call it, and which structures it works best with in production flow.

How To Call It

This is an object method: call it with a colon on a Region object created with Region(x, y, w, h), or Region() for the whole screen (region:<method>(...)). The global Region table does not have this method.

When To Use It

In detection flow, refresh the screen with Snap.screenRefresh() first, then narrow the search area and confidence using Region and FindParam.

Parameters and Return

templateOrBuilder is the target to measure (colour targets are the common case). param is a FindParam or option table; measuring also reads step (1 every pixel, 2 every second row and column...) and target ("combined", "angular", "largest", "first" or "nearest"). Returns a Result whose getMetrics() has w, h, left, top, right, bottom, pixels, scanned, coverage, fill, blobs, step, exact and degraded, or nil.

Best Combined With

It is typically combined with Snap, Region, Asset, and FindParam; you can feed the result into quickTap(), click(), or a follow-up OCR step.

Example Usage

The snippet below is a starter pattern that can be applied directly in runtime flow.

lua
Try in Editor →
local region = Region(100, 200, 600, 80)
local match = region:measure(Asset.color("#22C55E"), { step = 2 })
if match then
  local metrics = match:getMetrics()
  if metrics then print("health: " .. metrics.coverage) end
end

Copyable Progressive Examples

From foundation to combined usage, each level is provided as a separate code block so you can copy the level you need and adapt it directly.

Foundation

Shows the shortest direct way to call the API.

Foundation
lua
Try in Editor →
local region = Region(100, 200, 600, 80)
local match = region:measure(Asset.color("#22C55E"), { step = 2 })
if match then
  local metrics = match:getMetrics()
  if metrics then print("health: " .. metrics.coverage) end
end

Simple

Wraps the base call with minimal flow control.

Simple
lua
Try in Editor →
local stepOk = true
local region = Region(100, 200, 600, 80)
local match = region:measure(Asset.color("#22C55E"), { step = 2 })
if match then
  local metrics = match:getMetrics()
  if metrics then print("health: " .. metrics.coverage) end
end
if stepOk then
  wait(200)
end

Practical Flow

A practical pattern for real macros with pcall, logging, and guards.

Practical Flow
lua
Try in Editor →
local ok, err = pcall(function()
  local region = Region(100, 200, 600, 80)
  local match = region:measure(Asset.color("#22C55E"), { step = 2 })
  if match then
    local metrics = match:getMetrics()
    if metrics then print("health: " .. metrics.coverage) end
  end
end)

if not ok then
  print("API step failed: Region:measure: " .. tostring(err))
  requestStop()
end

Detailed

This level packages the API into a reusable helper with error reporting.

Detailed
lua
Try in Editor →
-- In detection flow, refresh the screen with Snap.screenRefresh() first, then narrow the search area and confidence using Region and FindParam.
local function run_measure_step()
  local region = Region(100, 200, 600, 80)
  local match = region:measure(Asset.color("#22C55E"), { step = 2 })
  if match then
    local metrics = match:getMetrics()
    if metrics then print("health: " .. metrics.coverage) end
  end
end

local ok, err = pcall(run_measure_step)
if not ok then
  toast("Step failed")
  print(err)
end

Combined

Combines the API with related structures to form a more realistic workflow.

Combined
lua
Try in Editor →
Snap.screenRefresh()
local region = Region(100, 200, 600, 80)
local match = region:measure(Asset.color("#22C55E"), { step = 2 })
if match then
  local metrics = match:getMetrics()
  if metrics then print("health: " .. metrics.coverage) end
end
toast("Detection step completed")