// Daniel Shiffman

// http://natureofcode.com

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// Example 1-4: Vector multiplication

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function setup() {

  createCanvas(640, 240);

}

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function draw() {

  background(255);

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  let mouse = createVector(mouseX, mouseY);

  let center = createVector(width / 2, height / 2);

  mouse.sub(center);

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  translate(width / 2, height / 2);

  strokeWeight(2);

  stroke(200);

  line(0, 0, mouse.x, mouse.y);

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  //{!1} Multiplying a vector!  The vector is now half its original size (multiplied by 0.5).

  mouse.mult(0.5);

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  stroke(0);

  strokeWeight(4);

  line(0, 0, mouse.x, mouse.y);

}

​