CODEWITHSUNDEEP
coronasdkmulti-touchtouch-event
Federico Capello
Federico Capello

Reputation: 1118

Detect X and Y of Each Multitouch Event in Corona SDK

After activating multitouch in Corona SDK, is there a way I can track the x and y coordinates of each simultaneous touch?
An ideal function would be like this:
local function detectMultitouch(touches)
for i = 0, #touches do
print(touches[i].x .. " ".. touches[i].y) end
end

Upvotes: 2

Views: 992

Answers (1)

NaviRamyle
NaviRamyle

Reputation: 4007

You can try this

system.activate("multitouch")

local touches = {}
local touchIDs = {}

local function detectMultitouch()
    for i = 1, #touchIDs do
        print("#"..i.." "..tostring(touchIDs[i]) .." = "..touches[touchIDs[i]].x..","..touches[touchIDs[i]].y)
    end
end

Runtime:addEventListener("touch",function(event)
    if event.phase == "began" then
        touches[event.id] = {}
        touches[event.id].x = event.x
        touches[event.id].y = event.y
        touches[event.id].coords = display.newText(tostring(event.id).." = "..touches[event.id].x..","..touches[event.id].y,0,0,system.nativeFont,15)
        touches[event.id].coords.x = touches[event.id].x
        touches[event.id].coords.y = touches[event.id].y

        table.insert(touchIDs,event.id)
    elseif event.phase == "moved" then
        touches[event.id].x = event.x
        touches[event.id].y = event.y
        touches[event.id].coords.text = tostring(event.id).." = "..touches[event.id].x..","..touches[event.id].y
        touches[event.id].coords.x = touches[event.id].x
        touches[event.id].coords.y = touches[event.id].y - 20
    elseif event.phase == "ended" then
        touches[event.id].coords:removeSelf()
        touches[event.id] = nil
        table.remove(touchIDs,table.indexOf(touchIDs, event.id))


        detectMultitouch(touches)
    end
end)

Upvotes: 2

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