Author Topic: recording the last horizontal direction player has moved? (Read 1123 times)

Niblic� · September 20, 2015, 12:55:17 PM

as in, the last angle the player has moved with horizontally while ignoring vertical movement

i want to make a playertype that, when the player presses space while moving in a direction, dashes in that direction. but i don't want the player to go up a ramp or jump or whatever, then press space and suddenly fly.

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Zeblote · September 20, 2015, 01:24:37 PM

Something like getWords(%player.getVelocity(), 0, 1) ?

Niblic� · September 20, 2015, 02:46:22 PM

Quote from: Zeblote on September 20, 2015, 01:24:37 PM

Something like getWords(%player.getVelocity(), 0, 1) ?

how would i apply that to setvelocity?

this vector stuff confuses me

elm · September 20, 2015, 04:41:48 PM

http://forum.blockland.us/index.php?topic=224122.0

Might help you understand vectors a little better.

Niblic� · September 20, 2015, 06:46:22 PM

ok thanks i think ive found a good way to do it

probably not optimized but it works

Code: [Select]

%vec1 = vectorNormalize(%player.getVelocity());
%vec = VectorScale(%vec1, 30);
%vec = getWords(%vec, 0, 1);
%vec2 = getWords(%vec1, 2, 3);
%player.setVelocity(%vec SPC %vec2);

phflack · September 20, 2015, 07:16:54 PM

if their velocity is at an angle at 5 units, they won't go as far as if they were moving sideways at 5 units

maybe try

Code: [Select]

%vec = vectorNormalize(%player.getVelocity());
%vec = getWords(%vec, 0, 1);
%vec = vectorScale(%vec, 30);
%player.addVelocity(%vec);

i'm not sure what you were trying to do with the %vec2 = getWords(%vec1, 2, 3);

Headcrab Zombie · September 20, 2015, 07:23:43 PM

You should cut out the Z component before you normalize it, otherwise your result will be different depending on the Z component
You may also want to consider addVelocity instead of setVelocity, depending on your goal

Code: [Select]

%vec = %player.getVelocity();
%normVec = VectorNormalize(getWords(%vec,0,1) SPC 0);
%scaledVec = VectorScale(%normVec,30);
%player.addVelocity(%scaledVec);

You may also want to VectorAdd a small Z vector to %scaledVec, otherwise friction against the ground will greatly reduce the movement

Swollow · September 21, 2015, 12:21:33 AM

Quote from: Niblic� on September 20, 2015, 06:46:22 PM

ok thanks i think ive found a good way to do it

probably not optimized but it works

Code: [Select]
%vec1 = vectorNormalize(%player.getVelocity()); %vec = VectorScale(%vec1, 30); %vec = getWords(%vec, 0, 1); %vec2 = getWords(%vec1, 2, 3); %player.setVelocity(%vec SPC %vec2);

use %vec2 = getWord(%vec1,2); rather than get words since there will only be words at index 0-2

Headcrab Zombie · September 21, 2015, 06:48:10 AM

Quote from: Swollow on September 21, 2015, 12:21:33 AM

use %vec2 = getWord(%vec1,2); rather than get words since there will only be words at index 0-2

Or just cut out the second vector entirely cuz I don't see what he's trying to do with that concatenation funkiness, just replace it with "0". Or even better, don't, and look at the way I did it
I think he might be trying to

Quote from: Headcrab Zombie on September 20, 2015, 07:23:43 PM

Add a small Z vector to %scaledVec, otherwise friction against the ground will greatly reduce the movement

but he's doing it the wrong way....that Z part will be 0 unless the player is already traveling vertically some, in which case it isn't terribly needed for that goal...I think it's more likely he just did random stuff until he made something that looked like it worked

boodals 2 · September 21, 2015, 08:10:59 AM

Quote from: Headcrab Zombie on September 21, 2015, 06:48:10 AM

Or just cut out the second vector entirely cuz I don't see what he's trying to do with that concatenation funkiness, just replace it with "0". Or even better, don't, and look at the way I did it
I think he might be trying to but he's doing it the wrong way....that Z part will be 0 unless the player is already traveling vertically some, in which case it isn't terribly needed for that goal...I think it's more likely he just did random stuff until he made something that looked like it worked

He is preserving the z velocity, which is the correct thing to do. If you are falling, and you dash, you don't want to magically stop falling and move forwards instead.

But yeah, its much easier to use AddVelocity here.

Headcrab Zombie · September 21, 2015, 08:23:06 AM

Quote from: boodals 2 on September 21, 2015, 08:10:59 AM

He is preserving the z velocity

Not quite
I see why you think that, but he's getting that z velocity from the result of vectorNormalize, not getVelocity, so it's only going to be between 0 and 1

boodals 2 · September 21, 2015, 08:29:45 AM

Quote from: Headcrab Zombie on September 21, 2015, 08:23:06 AM

Not quite
I see why you think that, but he's getting that z velocity from the result of vectorNormalize, not getVelocity, so it's only going to be between 0 and 1

Ah, so he is.

Swollow · September 21, 2015, 08:48:10 AM

Quote from: Headcrab Zombie on September 21, 2015, 08:23:06 AM

Not quite
I see why you think that, but he's getting that z velocity from the result of vectorNormalize, not getVelocity, so it's only going to be between 0 and 1

(or -1)

Niblic� · September 21, 2015, 09:44:25 AM

i probably dont need it at all since i disabled dashing mid air