ios7 - Sprite kit ios game slingshot machanism similar to angry bird game -


i newbie in ios gaming, , need create game using sprite kit framework functionality similar angry bird pulley system, , wants find distance object travelled pulley landing.

can me out this, thankfull it. in advance.

one way code slingshot effect use starting point on screen @ let's (x=100,y=100). display spritenode of slingshot y centered @ (100,100).

the next step use touchesbegan:withevent: in area of slingshot let code know player looking shoot slingshot.

you use touchesmoved:withevent: track how far (how tension) player pulling slingshot.

the release triggtouchesended:withevent. based on how far touch began (x=100) , how far released (for example x=30), can apply force this:

float forceused = starttouchx - endtouchx; [_projectile.physicsbody applyforce:cgvectormake(forceused, 0)];

if looking angle shot have track y , use variable instead of 0 above.

as calculating distance between 2 points on screen, boils down x , y coordinates. subtract objecta.position.x objectb.position.x

things can lot more complex of course depends on want in code. hope helps.

p.s. touches above part of uiresponder class.


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