Pen Settings



CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

+ add another resource


Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource


Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.


Auto Save

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.






                var x1 = 0, y1 = 0, x2 = 400, y2 = 400; // initial ordered pairs

function setup() {
  createCanvas(400, 400); //create the canvas
  background(0); //black background
  frameRate (5); //frame rate or speed

function draw() {
  stroke(150, 250, 200) //linecolor
  line(x1,y1,x2,y2) //draw line
  y1 = y1+ 5; //change the y1 with each loop
  y2 = y2 - 5;//change the y2 with each loop
  slope = (y2-y1)/(x2-x1); //calculate slope
  strSlope = str(round(slope,1)); //round the slope and make it into a string
  string = join(['Slope =  ',strSlope ],'');//create the string to print;
  fill(255); //set the color to white for the rectangle
  rect(180,380,100,400);//make the rectangle (x,y,width,height)
  stroke(0);//set the text color to black
  fill(0);//set the text fill to black
  text(string,200,395);//print the text
  if(y1>400){ //stop loop condition