### Today, a post of technology and activities.

A Google search for making a parabola brought me to a nice quick article on making a parabola-looking curved line on eHow.com, but for a quick half-day project I am needing to draw a perfect and scalable vector.

Attached is a simple script to run in Adobe Illustrator that was hand-typed to build what is needed for my project. Some convenient Javascript prompts are included to make it easy to use.

In illustrator, press Ctrl+F12 on Windows or Cmd+F12 on Mac or click File > Scripts > Other script and load the file, then read and follow the prompts.

Click here to download a helpful script for Adobe Illustrator to build a parabola

Here are two parabolas made with this script:

Pingback: How to Make Parabolas in Illustrator | Technology - Popular Question & Answer

Thanks…just what I was looking for. This is very handy!

Legend! Thank you so much. <3

ps.. 'Surprised there are not more comments after 3 years. How many downloads in this period all-told?

I’ve made it a little more useful for those who want more control over what are the parameters of the parabola:

alert(“The parabola will be generated according to this equation. \ny = a * (x – xOffset)^2 + b * (x – xOffset) + yOffset”);

xpos = parseFloat(prompt(“X offset”, “0”));

ypos = parseFloat(prompt(“Y offset”, “0”));

a = parseFloat(prompt(“Coefficient a”, “1”));

b = parseFloat(prompt(“Coefficient b”, “0”));

xstart = parseFloat(prompt(“First Value of X”, “-0.5”));

xend = parseFloat(prompt(“Last Value of X”, “0.5”));

steps = parseFloat(prompt(“How many steps should be there?”, 100) );

scale = parseFloat(prompt(“What should be the scale”, 400));

strokewidth = 1;

drawParabola(xpos, ypos, a, b, xstart, xend, steps, strokewidth, scale);

redraw();

function drawParabola(xpos, ypos, a, b, xstart, xend, steps, strokewidth, scale)

{

var increment = (xend -xstart) / steps;

var myDoc = app.activeDocument;//.documents.add();

var myParabolaPath = myDoc.pathItems.add();

myParabolaPath.stroked = true;

myParabolaPath.strokeWidth = strokewidth;

myParabolaPath.filled = false;

if (xstart > xend)

{

var tx = xstart;

xstart = xend;

xend = tx;

}

var newPoint;

for (i = xstart; i <= xend; i+= increment)

{

newPoint = myParabolaPath.pathPoints.add();

var x_ = i + xpos;

newPoint.anchor = [x_ * scale, (a * i* i + b * i + ypos) * scale];

newPoint.leftDirection = newPoint.anchor;

newPoint.rightDirection = newPoint.anchor;

newPoint.pointType = PointType.CORNER;

}

}

I got the script installed in Illustrator (CC), but when I run it and plug in values, nothing happens. I’m also not sure exactly what the values are that I should put in…but I just used the defaults, and nothing is produced. Any suggestions?