ios - How to vary impulse/velocity based on screen size/device -


i building game swift have sprites moving around screen have avoid. when test game on iphone 5, objects harder avoid on 6 or 6+. think because had velocity same across board (i adjusting sizes based on screen size). changed original impulse try , vary based on screen size matching numbers had cgvectors 

let gonex = screenwidth/6 let goney = screenheight/9 let gtwox = screenwidth/6 let gtwoy = screenheight/9  ghostone.physicsbody?.applyimpulse(cgvectormake(gonex, -goney)) ghosttwo.physicsbody?.applyimpulse(cgvectormake(-gtwox, gtwoy))

i did this, , helped enough notice difference between devices, still not acceptable. objects still harder or easier avoid based on device.

is there other way can vary impulse?


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