# Vector

Vector by Daniel Shiffman.

Demonstration some basic vector math: subtraction, normalization, scaling Normalizing a vector sets its length to 1.

```
void setup() {
size(640,360);
}

void draw() {
background(0);

// A vector that points to the mouse location
PVector mouse = new PVector(mouseX,mouseY);
// A vector that points to the center of the window
PVector center = new PVector(width/2,height/2);
// Subtract center from mouse which results in a vector that points from center to mouse
mouse.sub(center);

// Normalize the vector
mouse.normalize();

// Multiply its length by 150 (Scaling its length)
mouse.mult(150);

translate(width/2,height/2);
// Draw the resulting vector
stroke(255);
strokeWeight(4);
line(0,0,mouse.x,mouse.y);

}
```

## Functions Used

stroke()

Sets the color used to draw lines and borders around shapes

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size()

Defines the dimension of the display window width and height in units of pixels

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setup()

The setup() function is run once, when the program starts

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strokeWeight()

Sets the width of the stroke used for lines, points, and the border around shapes

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translate()

Specifies an amount to displace objects within the display window

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draw()

Called directly after setup(), the draw() function continuously executes the lines of code contained inside its block until the program is stopped or noLoop() is called

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PVector

A class to describe a two or three dimensional vector, specifically a Euclidean (also known as geometric) vector

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line()

Draws a line (a direct path between two points) to the screen

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background()

The background() function sets the color used for the background of the Processing window

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