Hey all!
I am an extreme beginner and just started using Corona. So far I have learned how to put a background and image up and I'm thinking the next step is interacting with my little fish that's on the screen. But I just can't figure out how to do it.
I've read the docs and searched the forums but I believe it's just my ignorance, of this getting in the way.
So I would really appreciate some help! I can give you my code so far and if its not too much trouble, would you be able to show me what the code looks like so I can drag this fish around the screen?
Thank you for the help!
background = display.newImage ( "fishtank.png" )
myImage = display.newImage( "fish.png", 20, 100 )
This is all I have.
Corona: code that can allow me to drag an object
Hi,
You should always try referring to the examples provided by Corona. You can always get ample of guidance from here itself.
Go to the Drag Platform example and you will find out what you need. There you will find dragUI Helpers class.
And the other thing, you were asking is related to Corona Software Development Kit. So you must refer the SDK Guide because you will encounter these kind of problems in future.
Corona: code that can allow me to drag an object
At the beginning of the user's touch. You have to store the current location of the object.
During the move phase. Subtract the stat location.
And also add also store the location of the object. In the end you can also change the location to the newly calculated one.
-- create object
local myObject = display.newRect( 0, 0, 100, 100 )
myObject:setFillColor( 255 )
-- touch listener function
function myObject:touch( event )
if event.phase == "began" then
self.markX = self.x -- store x location of object
self.markY = self.y -- store y location of object
elseif event.phase == "moved" then
local x = (event.x - event.xStart) + self.markX
local y = (event.y - event.yStart) + self.markY
self.x, self.y = x, y -- move object based on calculations above
end
return true
end
-- make 'myObject' listen for touch events
myObject:addEventListener( "touch", myObject )
This script will allow you to drag an object. I hope this helped
Regards,
Peter Franklin
Corona: code that can allow me to drag an object
You must know the logic behind how an object is dragged?
I have divided it in two phase – began and move.
The Logic is –
1. At the beginning (i.e. “began” phase event), firstly, you must store the current location of the object.
2. In the second phase i.e. The “move” phase, you shall subtract the start location of the event
See below for coding) from the event’s current location (see below for coding)
3. You shall add the stored location of the object as well.
4. Eventually, you need to change the current location of the object to the new created location which will actually move the object.
Please find the detailed coding here –
— Create object
local myObject = display.newRect( 0, 0, 100, 100 )
myObject:setFillColor( 255 )
— touch listener function
function myObject:touch( event )
if event.phase == "began" then
self.markX = self.x — store x location of object
self.markY = self.y — store y location of object
elseif event.phase == "moved" then
local x = (event.x – event.xStart) + self.markX
local y = (event.y – event.yStart) + self.markY
self.x, self.y = x, y — move object based on calculations above
end
return true
end
— make 'myObject' listen for touch events
myObject:addEventListener( "touch", myObject )
Corona: code that can allow me to drag an object
Hi,
I’ll give a simple script that will move your fish, where the user (you) will touch the screen.
For this I’ll use your image.
— your fish image
local image = display.newImageRect( "fish.png", 20, 100 )
image:translate( halfW, halfH )
— Mask
local mask = graphics.newMask( "fish.png" )
image:setMask( mask )
function onTouch( event )
local t = event.target
local phase = event.phase
if "moved" == phase then
t.maskX = event.x
t.maskY = event.y
end
end
image:addEventListener( "touch", onTouch )
Have fun,
Aabel
