Basic Shooter Game

mriics · December 2011

I feel like this shouldn't be extremely hard but I can't seem do figure it out. I am just starting to learn Gideros and wanted to make a game with your player at the bottom and you shoot at the enemies on top. The part that is giving me problems is creating the bullets at the player's location having it travel up and be deleted when it leaves the screen. Any help would be appreciated.

MikeHart · December 2011

Hi mriics,

today I have no time, but tommorow I can show you some code.

Michael

MikeHart · December 2011

Here you go. Not pretty but shows the concept.

And please load the gtween.lua and the easing.lua from the GTWEEN sample into this project:

 
--******** The shot class ************
cShot = gideros.class(Sprite)
 
function cShot:init()
	self.shot = Bitmap.new(Texture.new("images/shot.png"))
	self.shot:setAnchorPoint(0.5, 0.5)
	stage:addChild(self.shot)
end
 
 
function onShotComplete(tween)
	local child = tween.target
	local parent = child:getParent()
	parent:removeChild(child)
end
 
function cShot:Fire(x,y)
	self.shot:setPosition(x,y-0)
	local tweenx = GTween.new(self.shot, 2, {y = 10}, {onComplete=onShotComplete })
end
 
-- Creating and controlling your ship
local ship = Bitmap.new(Texture.new("images/ship.png"))
ship:setAnchorPoint(0.5, 0.5)
ship:setPosition(50,application:getContentHeight()-100)
stage:addChild(ship)
GTween.new(ship, 4, {x = application:getContentWidth()-50}, {delay = 0.2, ease = easing.inOutQuadratic, repeatCount = -1, reflect = true})
ship.counter = 50
 
function ship:onEnterFrame(event)
	self.counter = self.counter - 1
	if self.counter < 0 then
		self.counter = 50
		local cs = cShot.new()
		local x,y = self:getPosition()
		cs:Fire(x,y-30)
	end
end
ship:addEventListener(Event.ENTER_FRAME, ship.onEnterFrame, ship)

mriics · December 2011

Thank you that worked perfectly. I was able to imbed that into my game which controlled the player using the accelerometer and I got that working fine but I can't get the player to stop at the sides of the screen.

MikeHart · December 2011

Just check in the onEnterFrame event against x <0 or x > application:getContentWidth(). If true then set x to 0 or application:getContentWidth().

mriics · December 2011

When I did that the ship will stop at the side but if you hold it against the side for a while it will take a while to start moving again when you tilt the device the other way. If you need my code I can post it.

gorkem · December 2011

@MikeHart @mriics

After reading this thread, an idea popped up:

- A developer writes a sample code and uploads this to a server (e.g dropbox, etc)
- He then points to this link with a URI, like gdr://dropbox.com/folder/my_sample.gproj in this forum.
- Mriics clicks on this link in his phone (iPhone or Android)
- Mobile device recognizes this URI, and immediately runs Gideros Player
- Gideros Player runs the code.

This way, Mike doesn't have to put the code in this forum, but rather uploads it on a server, and then writes the link here.

When Mriics sees the post, but does not have access to his laptop, he can run Mike's sample on his mobile phone immediately.

Atilim says this can be implemented. We believe it's something "new", and maybe "innovative" since we haven't seen such a use case in any other frameworks out there.

FYI.

MikeHart · December 2011

@mriics, yes, please post the code or better the project.

@Gorkem: That woudl only be usefull for one file and no resources, or?

mriics · December 2011

Here is the code for the ship's movement

fx = 0
fy = 0

function ShipMove(event)

local x, y = application:getAccelerometer()
local shipx, shipy = ship:getPosition()

fx = x + fx
fy = y + fy

shipx = (400 + fy * 400) * -.07
shipy = 480 - ship:getHeight()

if shipx < 0 then
shipx = 0
end
if shipx > 700 then
shipx = 700
end

ship:setPosition(shipx, shipy)

end

sorry I dont know how to imbed the code in the comment

gorkem · December 2011

@Mike

There are two possible mehods:

1) Player first loads the gproj file and all assets on the server mentioned in gproj, like:

dropbox.com/folder/mysample.gproj
   +-- main.lua
   +-- sounds/
   +-- images/

2) Player loads the zip file including gproj + all assets in one pack, unzips this and starst playing.

@mriics

Use:

< pre lang="lua">
your code here
< / pre>

MikeHart · December 2011

Mmmh, there are some weird things in your code. Like you calculate shipx depending on fy???

But here is how I would do it:

function ShipMove(event)
 
    local x, y = application:getAccelerometer()
    local shipx, shipy = ship:getPosition()
 
    shipx = shipx + x
    shipy = 480 - ship:getHeight()
 
    if shipx < 0 then
        shipx = 0
    end
    if shipx > application:getContentWidth() then
        shipx = application:getContentWidth()
    end
 
    ship:setPosition(shipx, shipy)
 
end

mriics · December 2011

Thank you it worked. I had to change one thing however. Where it says
shipx = shipx + x

I changed it to
shipx = shipx - y

And this worked
Could this be because it is in landscape.

Before I changed it, it would move based on the wrong axis.

MikeHart · December 2011

ah, I thought you were in portrait mode. Great that you got it working.

mriics · December 2011

Ok, Thanks for your help

Sergeyka · January 2012

In 2011.9 version missed "application:getContentWidth"
Possible it correspond with "Application:getLogicalWidth()"

p.s. Sorry for bad english.

MikeHart · January 2012

application:getcontentWidth is available in beta 7. And yes, you can replace it with getLogicalWidth.

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