How to fill a rectangle with gradient in corona SDK

Corona has a property called graphics.newGradient(), which will be useful for coloring/filling your rectangle with suitable color gradient.

-- First create the rectangle --

local myRectangle = display.newRect( 0, 0, 200, 200 )

-- Then create the gradient method --

local g = graphics.newGradient(

                            { 255, 255, 255 },     -- This is the first color array

                            { 200, 200, 200 },     -- This is the second color array

                             "down" )                  --[[ This is the gradient direction.

                                                                    Default is "down"

                                                                    Others are "up","right" and "left". --]]

-- Now fill your rectangle with the created gradient as: --

myRectangle:setFillColor( g )

How to check whether the testing device supports vibration facility in corona SDK

You may need to implement vibration feedbacks in many of your applications, especially in games and during warning alerts. In this chapter, you will learn about the a boolean key event to check whether your device supports vibrational feedback for your corona app. If this key event returns true,then your device will support vibration feedbacks, and if it returns false, then your device won't.

--  Function to trigger key event --

local function onKeyEvent( event )

    -- Vibrate the gamepad if its 'A' button was pressed.

    if (event.keyName == "button_A") and (event.phase == "down") then

        if event.device and event.device.canVibrate then

            event.device:vibrate()

        end

    end

end

Runtime:addEventListener( "key", onKeyEvent )

Note: This will not work with Android versions <= 4.0.

How to repeat 2 backgrounds continuously forever in corona SDK game

In this tutorial, we will learn about how to repeat 2 backgrounds forever in our corona SDK game application. The code is as follows:

  
  -- Creating 2 images to run as background --

  local bg1 = display.newImageRect( "bg_1.png" ,480 ,320)
  bg1.x = display.contentWidth/2; bg1.y = display.contentHeight/2

  local bg2 = display.newImageRect( "bg_2.png" ,480 ,320 )
  bg2.x = bg1.x + bg1.width; bg2.y = display.contentHeight/2

-- Declaring a local variable to determine the movement speed --
  local speed = 30

-- Move Function --

  function move()
      bg1.x = bg1.x-speed;
      bg2.x = bg2.x-speed;

      if(bg1.x + bg1.width/2 < 0)then
        bg1.x = bg1.width*3/2-speed
      elseif(bg2.x + bg2.width/2 < 0)then
        bg2.x = bg2.width*3/2-speed
      end
  end
  Runtime:addEventListener( "enterFrame", move )

How to split complex strings in corona SDK

This session will teach you about splitting complex string of data separated with some characters. Lets assume that you have a string as House;home,40|Bed,20|Mirror,10. Now we will show you how to split each word and assigning each to a table.

  local myString = "House;home,40|Bed,20|Mirror,10"

  local myTable = {}

  for word in string.gmatch(myString, '([^,|]+)') do

     -- 'myTable' contains the data you need

    myTable[#myTable+1]=word print( myTable[#myTable] )

   end

Hence you will get the items as each table elements, as:

  

  myTable[1] = House

  myTable[2] = home

  myTable[3] = 40

  myTable[4] = Bed

  myTable[5] = 20

  myTable[6] = Mirror

  myTable[7] = 10