Explosion.lua

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--
-- main.lua
--
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-- Gravity

local physics = require( "physics" )

physics.start()
physics.setGravity( 0, 25 ) -- ( x, y )
--physics.setDrawMode( "hybrid" )   -- Shows collision engine outlines only

local playerBullets = {} -- Table that holds the players Bullets

local leftWall = display.newRect( 0, display.contentHeight / 2, 1, display.contentHeight )
-- myRectangle.strokeWidth = 3
-- myRectangle:setFillColor( 0.5 )
-- myRectangle:setStrokeColor( 1, 0, 0 )
leftWall.alpha = 0.0
physics.addBody( leftWall, "static", { 
    friction = 0.5, 
    bounce = 0.3 
    } )

local theGround1 = display.newImage( "./assets/sprites/land.png" )
theGround1.x = 520
theGround1.y = display.contentHeight
theGround1.id = "the ground"
physics.addBody( theGround1, "static", { 
    friction = 0.5, 
    bounce = 0.3 
    } )

local theGround2 = display.newImage( "./assets/sprites/land.png" )
theGround2.x = 1520
theGround2.y = display.contentHeight
theGround2.id = "the ground" -- notice I called this the same thing
physics.addBody( theGround2, "static", { 
    friction = 0.5, 
    bounce = 0.3 
    } )

local badCharacter = display.newImage( "./assets/sprites/enemy.png" )
badCharacter.x = 1520
badCharacter.y = display.contentHeight - 1000
badCharacter.id = "bad character"
physics.addBody( badCharacter, "dynamic", { 
    friction = 0.5, 
    bounce = 0.3 
    } )

local theCharacter = display.newImage( "./assets/sprites/character.png" )
theCharacter.x = display.contentCenterX - 200
theCharacter.y = display.contentCenterY
theCharacter.id = "the character"
physics.addBody( theCharacter, "dynamic", { 
    density = 3.0, 
    friction = 0.5, 
    bounce = 0.3 
    } )
theCharacter.isFixedRotation = true -- If you apply this property before the physics.addBody() command for the object, it will merely be treated as a property of the object like any other custom property and, in that case, it will not cause any physical change in terms of locking rotation.

local dPad = display.newImage( "./assets/sprites/d-pad.png" )
dPad.x = 150
dPad.y = display.contentHeight - 80
dPad.alpha = 0.50
dPad.id = "d-pad"

local upArrow = display.newImage( "./assets/sprites/upArrow.png" )
upArrow.x = 150
upArrow.y = display.contentHeight - 190
upArrow.id = "up arrow"

local downArrow = display.newImage( "./assets/sprites/downArrow.png" )
downArrow.x = 150
downArrow.y = display.contentHeight + 28
downArrow.id = "down arrow"

local leftArrow = display.newImage( "./assets/sprites/leftArrow.png" )
leftArrow.x = 40
leftArrow.y = display.contentHeight - 80
leftArrow.id = "left arrow"

local rightArrow = display.newImage( "./assets/sprites/rightArrow.png" )
rightArrow.x = 260
rightArrow.y = display.contentHeight - 80
rightArrow.id = "right arrow"

local jumpButton = display.newImage( "./assets/sprites/jumpButton.png" )
jumpButton.x = display.contentWidth - 80
jumpButton.y = display.contentHeight - 80
jumpButton.id = "jump button"
jumpButton.alpha = 0.5

local shootButton = display.newImage( "./assets/sprites/jumpButton.png" )
shootButton.x = display.contentWidth - 250
shootButton.y = display.contentHeight - 80
shootButton.id = "shootButton"
shootButton.alpha = 0.5
 
local function characterCollision( self, event )
 
    if ( event.phase == "began" ) then
        print( self.id .. ": collision began with " .. event.other.id )
 
    elseif ( event.phase == "ended" ) then
        print( self.id .. ": collision ended with " .. event.other.id )
    end
end

-- if character falls off the end of the world, respawn back to where it came from
local function checkCharacterPosition( event )
    -- check every frame to see if character has fallen
    if theCharacter.y > display.contentHeight + 500 then
        theCharacter.x = display.contentCenterX - 200
        theCharacter.y = display.contentCenterY
    end
end

local function checkPlayerBulletsOutOfBounds()
	-- check if any bullets have gone off the screen
	local bulletCounter

    if #playerBullets > 0 then
        for bulletCounter = #playerBullets, 1 , -1 do
            if playerBullets[bulletCounter].x > display.contentWidth + 1000 then
                playerBullets[bulletCounter]:removeSelf()
                playerBullets[bulletCounter] = nil
                table.remove(playerBullets, bulletCounter)
                print("remove bullet")
            end
        end
    end
end

local function onCollision( event )
 
    if ( event.phase == "began" ) then
 
        local obj1 = event.object1
        local obj2 = event.object2
        local whereCollisonOccurredX = obj1.x
        local whereCollisonOccurredY = obj1.y

        if ( ( obj1.id == "bad character" and obj2.id == "bullet" ) or
             ( obj1.id == "bullet" and obj2.id == "bad character" ) ) then
            -- Remove both the laser and asteroid
            --display.remove( obj1 )
            --display.remove( obj2 )
 			
 			-- remove the bullet
 			local bulletCounter = nil
 			
            for bulletCounter = #playerBullets, 1, -1 do
                if ( playerBullets[bulletCounter] == obj1 or playerBullets[bulletCounter] == obj2 ) then
                    playerBullets[bulletCounter]:removeSelf()
                    playerBullets[bulletCounter] = nil
                    table.remove( playerBullets, bulletCounter )
                    break
                end
            end

            --remove character
            badCharacter:removeSelf()
            badCharacter = nil

            -- Increase score
            print ("you could increase a score here.")

            -- make an explosion sound effect
            local expolsionSound = audio.loadStream( "./assets/sounds/8bit_bomb_explosion.wav" )
            local explosionChannel = audio.play( expolsionSound )

            -- make an explosion happen
            -- Table of emitter parameters
			local emitterParams = {
			    startColorAlpha = 1,
			    startParticleSizeVariance = 250,
			    startColorGreen = 0.3031555,
			    yCoordFlipped = -1,
			    blendFuncSource = 770,
			    rotatePerSecondVariance = 153.95,
			    particleLifespan = 0.7237,
			    tangentialAcceleration = -1440.74,
			    finishColorBlue = 0.3699196,
			    finishColorGreen = 0.5443883,
			    blendFuncDestination = 1,
			    startParticleSize = 400.95,
			    startColorRed = 0.8373094,
			    textureFileName = "./assets/sprites/fire.png",
			    startColorVarianceAlpha = 1,
			    maxParticles = 256,
			    finishParticleSize = 540,
			    duration = 0.25,
			    finishColorRed = 1,
			    maxRadiusVariance = 72.63,
			    finishParticleSizeVariance = 250,
			    gravityy = -671.05,
			    speedVariance = 90.79,
			    tangentialAccelVariance = -420.11,
			    angleVariance = -142.62,
			    angle = -244.11
			}
			local emitter = display.newEmitter( emitterParams )
			emitter.x = whereCollisonOccurredX
			emitter.y = whereCollisonOccurredY

        end
    end
end

function upArrow:touch( event )
    if ( event.phase == "ended" ) then
        -- move the character up
        transition.moveBy( theCharacter, { 
        	x = 0, -- move 0 in the x direction 
        	y = -50, -- move up 50 pixels
        	time = 100 -- move in a 1/10 of a second
        	} )
    end

    return true
end

function downArrow:touch( event )
    if ( event.phase == "ended" ) then
        -- move the character up
        transition.moveBy( theCharacter, { 
        	x = 0, -- move 0 in the x direction 
        	y = 50, -- move up 50 pixels
        	time = 100 -- move in a 1/10 of a second
        	} )
    end

    return true
end

function leftArrow:touch( event )
    if ( event.phase == "ended" ) then
        -- move the character up
        transition.moveBy( theCharacter, { 
        	x = -50, -- move 0 in the x direction 
        	y = 0, -- move up 50 pixels
        	time = 100 -- move in a 1/10 of a second
        	} )
    end

    return true
end

function rightArrow:touch( event )
    if ( event.phase == "ended" ) then
        -- move the character up
        transition.moveBy( theCharacter, { 
        	x = 50, -- move 0 in the x direction 
        	y = 0, -- move up 50 pixels
        	time = 100 -- move in a 1/10 of a second
        	} )
    end

    return true
end

function jumpButton:touch( event )
    if ( event.phase == "ended" ) then
        -- make the character jump
        theCharacter:setLinearVelocity( 0, -750 )
    end

    return true
end

function shootButton:touch( event )
    if ( event.phase == "began" ) then
        -- make a bullet appear
        local aSingleBullet = display.newImage( "./assets/sprites/Kunai.png" )
        aSingleBullet.x = theCharacter.x
        aSingleBullet.y = theCharacter.y
        physics.addBody( aSingleBullet, 'dynamic' )
        -- Make the object a "bullet" type object
        aSingleBullet.isBullet = true
        aSingleBullet.isFixedRotation = true
        aSingleBullet.gravityScale = 0
        aSingleBullet.id = "bullet"
        aSingleBullet:setLinearVelocity( 1500, 0 )

        table.insert(playerBullets,aSingleBullet)
        print("# of bullet: " .. tostring(#playerBullets))
    end

    return true
end


upArrow:addEventListener( "touch", upArrow )
downArrow:addEventListener( "touch", downArrow )
leftArrow:addEventListener( "touch", leftArrow )
rightArrow:addEventListener( "touch", rightArrow )

jumpButton:addEventListener( "touch", jumpButton )
shootButton:addEventListener( "touch", shootButton )

Runtime:addEventListener( "enterFrame", checkCharacterPosition )
Runtime:addEventListener( "enterFrame", checkPlayerBulletsOutOfBounds )
Runtime:addEventListener( "collision", onCollision )