1.4: Vector Math II - The Nature of Code

This video continues the discussion about vector mathematics. How to calculate a vector's magnitude (using PVector mag()) and how to normalize a vector (using normalize()) are also discussed.

Help us caption & translate this video!

[ahmaykmewsik]

"Something we want in our lives is to just be normal sometimes. Actually we don't want to be normal. I actually have no idea what I'm talking about. Who knows what we want in our lives? Vectors. Sometimes we want our vectors to be normal. Forget about out lives, I know nothing about how to deal with what's life, but I do know something about vectors!"

[ggilabert]

You are a really gifted teacher Daniel! I'm new to coding and Im learning to use C#, but the concepts you teach in this videos are solid gold! Thanks you very much! Greetings from Buenos Aires, Argentina!

[eduardatonga]

This is extremely useful thank you as a physcist this gives me a great way to simulate what i do with my math or experiments I cant do in real life.

[Invalid]

There is the Math.hypot(x, y) function which does exactly the same thing as Math.sqrt(x*x + y*y). It's especially designed for calculating distance which means its much faster and it's much more compact than its counterpart.

[valforeststorm]

this video did help because you showed the math of the PVector and I made the same thing in javascript

[michaelalbert]

watching all these videos at 1.25x or 1.5x speed = endless entertainment

[ahmadsebaq]

Your videos are amazing and easy to understand. Thank you Daniel!

[oscarmejia]

Your videos are absolutely insightful! I thought mathematica was cool, but processing is the real deal !

[katsumoto]

Depending on which ad you watched, it's like Shiffman is reacting to it in the first 2 seconds of the video! XD

[efed]

You are awesome, it sounds strange but you saved my life😁😁

[MrFruture]

You're the best! Thank you Daniel!

[junezaniyazi]

when i deal with vector i have realised that when i dont use translate() function the vector subtract gives a very different result could you please tell me how i can get the same result in vector subtract without using translate (); ?

[augustogava]

Caralho!! Finamente entendi o que é normalizar um vector!

[ClearNinjaFox]

what is the limitation of building a program with p2 or p3? i dont want to learn all this to find myself not being able to actually do what i want cuz of the lag or memory problems

[haneenn.k]

thank you so much Dan, your videos are more than awesome, i have a question i did the exact code but the arrow not moved according to my mouse location

[ArisMelachroinos]

Please correct me if I am wrong, but you used translate and you made the center point the point 0, 0 . Shouldn't you write PVector center = new PVector(0, 0); ???? why did you put (width/2, height/2); You have already done the translation :/

[coreyp]

So your wallpaper has normalized vectors?

[QwertyNPC]

I don't get why are you subtracting and translating vectors to draw a line. Is that for demonstration ? This works as well and is less confusing I think:

PVector start = new PVector();

void setup(){
size(640, 480);
background(255);
start.x = width/2;
start.y = height/2;
}

void draw(){

background(255);
strokeWeight(2);
stroke(0);
noFill();

//translate(width/2, height/2);
ellipse(start.x, start.y, 4, 4); //center

PVector mouse = new PVector(mouseX, mouseY);
//PVector center = new PVector(width/2, height/2);
//mouse.sub(start);

line(start.x, start.y, mouse.x, mouse.y);

fill(0, 255, 0, 50);
mouse.sub(start);
rect(start.x, start.y, mouse.x, mouse.y);
}

void mouseClicked() {
start.x = mouseX;
start.y = mouseY;
}

[Pompiduskus]

while( this.x > 1 || this.y > 1 ){
this.x *= 0.999; this.y *= 0.999;
}

[Shockszzbyyous]

okay, so i got totally distracted when i started coding! and now i have build this ..