Hello,
My goal is to create a game where there are no on screen controls - just sections of the screen that does something
for example:
onQ3Touch move left
on Q4Touch move right
on Q1Q2Touch jump
Q1-4 being quadrants.
if anyone can point me to the right place I greatly appreciate it.
I already have an idea of how it is supposed to be done - I’m guessing transparent rectangles - but I’m not 100% sure how.
Thanks,
Marc
Just add a Runtime touch listener like this:
[lua]Runtime:addEventListener(“touch”, yourListener)[/lua]
Then within your function listener check the event.x and event.y fields to determine which quadrant you are in and then call functions that are for each quadrant.
[lua]local function yourListener(event) – make sure you have event as a parameter
if event.x < display.contentWidth/2 then
if event.y < display.contentHeight/2 then
– top left quadrant function
else
– bottom left quadrant function
end
else
if event.y < display.contentHeight/2 then
– top right quadrant function
else
– bottom right quadrant function
end
end
end[/lua]
Note that you need to declare your function BEFORE you add the Runtime listener.
Just remember - if you don’t mind me interjecting here - if you want to save CPU cycles in your game (every little bit counts, especially if you’re doing a lot of things like this), avoid dividing by 2 when you can multiply by 0.5. Division is a more taxing instruction than multiplication.
Also, you can use display.contentCenterX and display.contentCenterY , which is identical to display.contentWidth * 0.5 and display.contentHeight * 0.5 , respectively.
Good point BeyondtheTech. I always forget that division takes longer. Do you know how bad it really is?
Probably negligible if it’s just done every once in a while, but in my game where I’m running tons of calculations in the enterFrame event listener, I need to make sure it’s in and out at lightning speed, or frames could start skipping. I’m not taking ANY chances!
Just add a Runtime touch listener like this:
[lua]Runtime:addEventListener(“touch”, yourListener)[/lua]
Then within your function listener check the event.x and event.y fields to determine which quadrant you are in and then call functions that are for each quadrant.
[lua]local function yourListener(event) – make sure you have event as a parameter
if event.x < display.contentWidth/2 then
if event.y < display.contentHeight/2 then
– top left quadrant function
else
– bottom left quadrant function
end
else
if event.y < display.contentHeight/2 then
– top right quadrant function
else
– bottom right quadrant function
end
end
end[/lua]
Note that you need to declare your function BEFORE you add the Runtime listener.
Just remember - if you don’t mind me interjecting here - if you want to save CPU cycles in your game (every little bit counts, especially if you’re doing a lot of things like this), avoid dividing by 2 when you can multiply by 0.5. Division is a more taxing instruction than multiplication.
Also, you can use display.contentCenterX and display.contentCenterY , which is identical to display.contentWidth * 0.5 and display.contentHeight * 0.5 , respectively.
Good point BeyondtheTech. I always forget that division takes longer. Do you know how bad it really is?
Probably negligible if it’s just done every once in a while, but in my game where I’m running tons of calculations in the enterFrame event listener, I need to make sure it’s in and out at lightning speed, or frames could start skipping. I’m not taking ANY chances!