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# Trajectory of flight

Posts: 815

I haven't found any lessons, were you can be learned for it. Can you give me tags of how to search for it? For example I tried trajectory, flight, path, but they didn't gave me a link. I am confused, so I tried to ask you, if the physic engine Codea gives would be possible to use?

• Mod
Posts: 7,602

Do you want the trajectory of something like a bullet or the trajectory of a space ship in orbit. The physics engine would do a bullet type trajectory with very little code.

• Mod
edited February 2017 Posts: 7,602

Since I don't know what you want, here's an example of an Angry Bird type of trajectory.

``````supportedOrientations(LANDSCAPE_ANY)
displayMode(FULLSCREEN)

function setup()
b=physics.body(CIRCLE,10)
b.x=10
b.y=10
b.type=STATIC
physics.continuous=true
end

function draw()
background(0)
fill(255)
ellipse(b.x,b.y,20)
text("tap screen to shoot",WIDTH/2,HEIGHT-50)
if b.y<0 then
b.type=STATIC
b.x=10
b.y=10
end
end

function touched(t)
if t.state==BEGAN then
b.type=DYNAMIC
b.linearVelocity=vec2(300,500)
end
end
``````
• Mod
Posts: 7,602

If you don't want to use physics, try this. Change dt, grav, xSpeed, or ySpeed for the effect you want.

``````displayMode(FULLSCREEN)

function setup()
x,y,t=0,0,0
dt=1/60 -- time interval
grav=16 -- gravity
xSpeed=130  -- x initial velocity
ySpeed=130  -- y initial velocity
end

function draw()
background(0)
fill(255)
t=t+dt
x=t*xSpeed
y=t*ySpeed-(t*t*grav)
ellipse(x,y,10)
text("tap screen to shoot",WIDTH/2,HEIGHT-50)
end

function touched(t)
if t.state==BEGAN then
setup()
end
end
``````
• Posts: 815

Thank you! This simple code is a beginning for a big Codea project!