# Does Construct has problems with physics?

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• Hi!

I'm trying to launch the cat from one point to another. I know the coordinates, Velocity along X and Gravity. The cat has Platformer behavior. MaxSpeed, MaxFallSpeed and Deceleration are set to 99999999. The gravity is constant.

Using this formulas:

[quote:29esez9r]x(t)=x(0)+vx(0)*t

y(t)=y(0)+vy(0)*t-0.5*g*t^2

where t is the flight time.

I've managet to get the Velocity along Y I need to apply to cat to launch him so he lands at specific spot but when I test the game I can't get the correct result - the cat lands slightly further every time.

Here are my calculations:

[quote:29esez9r]Vx:=300;Xc:=20;Yc:=290;Xt:=300;Yt:=290;G:=1500

= 1500

t:=(Xt-Xc)/Vx

= 0.9333

Vy:=(Yt-Yc+0.5*G*t*t)/t

= 700

Cat starts at (20,290) and has to land at (300,290). Horisontal velocity is 300 and gravity is 1500. According to my calculations the vertial velocity shoud be equal to 700 but when I set this velocity to the cat he lands not at (300,290) but from 5 to 10 pixels further along the X.

Here's the link for the project:

https://www.dropbox.com/s/gi940wsgoozqquv/Asshole%20Cat.capx

• It appears to me (sorry if I'm wrong) that you are attempting to create the Angry Bird type mechanic.

Have you tried the Physics Catapult template?

• It's not similar to angry bird - the cat has to land at specific spot and nowhere else.

The platform has to have "Jump Trough" behavior. I couldn't reproduce it with Physics behavior.

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• You might like this capx: (not made by me)

• You might like this capx: (not made by me)

Looks good ) Thanks. Will try to mod this project with jump trough mechanic. But still have to test the precision of the calculations.

• 5 posts