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Drawing polygons

From: Interactive Data Visualization with Processing

Video: Drawing polygons

The next step in Processing is to learn how to draw polygons or irregular shapes, this is still with flat sides, but you can have however many corners you want. And you can have whatever relationship between them that you want. This one is also a little bit different, because it has several different lines of code. And let me show you how this works by creating a new sketch right here. What I'm going to do is begin by putting in the name of the sketch. Now I will put in the size of the window, turn on anti-aliasing make things smoother, I'll give it a background color.

Drawing polygons

The next step in Processing is to learn how to draw polygons or irregular shapes, this is still with flat sides, but you can have however many corners you want. And you can have whatever relationship between them that you want. This one is also a little bit different, because it has several different lines of code. And let me show you how this works by creating a new sketch right here. What I'm going to do is begin by putting in the name of the sketch. Now I will put in the size of the window, turn on anti-aliasing make things smoother, I'll give it a background color.

I'm going to use a hex code and that's going to be D9C6B0 kind of a tan color, there we go right there. Then I am going to put in a strokeWeight for the borders of these of 5 pixels, Save all that. Now to be able to draw an irregular polygon, you need several lines. The first thing it need to do is you have to have a command that says beginShape and that's all there is to that one.

Then what you do is you have to give a separate line for each of the corners or vertices in this, so you type vertex and you gave the x and y coordinates for each of the vertices. So in this case, I'm going to go 200 and 150, then just keep typing, I'm going to draw a hexagon, so I've six of these. 150 and 125 and 150 and 75, so that's number five and then the last one, let's say 250 and 125.

Then I began with beginShape, I need to finish it off with endShape, so Processing knows I'm done adding corners. And when I do that I can Save it and I can Run it and there you have it. Now you notice a couple of interesting things, aside from the default white fill and black border, you see also that at the bottom right, I don't have a black line, there's an open space there. That's because Processing doesn't close polygons unless you specifically ask it to. So let me show you two things.

Number one, I actually, I am going to change the color of that by going to stroke, 314650; And all you have to do is come down to the bottom to endShape and type in, in all capitals, the word CLOSE and that tells it that they you want to go back to the first point. Press Save and Run and now I have a closed shape. Now I'm just going to add one more shape, because I can, and to make my life easy, I'm going to copy this and paste it down here.

And it changed the color a little bit to 45718C and then I'm just moving everything over about 200 pixels. So I go to 400, to 350, to 350, to 400, 450, and 450. This one will also be closed. I Save it and I Run it. And now I have my two hexagons, if I wanted to make a shape with more sides, say for instance 20 sides or 30 sides, I could do that.

I would just need to have one line of code to give the x and y coordinates for every corner in the shape. And that's how we draw a polygon in Processing.

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This video is part of

Image for Interactive Data Visualization with Processing
Interactive Data Visualization with Processing

72 video lessons · 13951 viewers

Barton Poulson
Author

 
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  1. 3m 16s
    1. Welcome
      58s
    2. What you should know
      1m 22s
    3. Using the exercise files
      56s
  2. 11m 51s
    1. Overview of data visualization
      11m 51s
  3. 11m 53s
    1. Installing Processing
      3m 38s
    2. Overview of Processing
      4m 5s
    3. Exploring libraries
      4m 10s
  4. 1h 1m
    1. Basic setup
      7m 31s
    2. Drawing points
      4m 37s
    3. Drawing lines
      5m 6s
    4. Drawing ellipses and circles
      5m 24s
    5. Drawing arcs
      6m 54s
    6. Drawing rectangles and squares
      4m 58s
    7. Drawing quadrangles
      3m 25s
    8. Drawing triangles
      2m 55s
    9. Drawing polygons
      3m 37s
    10. Drawing simple curves
      4m 54s
    11. Drawing complex curves
      6m 46s
    12. Drawing Bézier curves
      5m 38s
  5. 54m 3s
    1. Introduction to variables
      10m 44s
    2. Understanding variable scope
      6m 53s
    3. Modifying variables
      9m 8s
    4. Creating arrays
      9m 53s
    5. Modifying arrays
      6m 37s
    6. Creating strings
      7m 3s
    7. Modifying strings
      3m 45s
  6. 1h 2m
    1. Incorporating randomness
      7m 59s
    2. Using Perlin noise
      4m 24s
    3. Shuffling with Java
      3m 30s
    4. Specifying line attributes
      8m 2s
    5. Changing placement modes
      5m 45s
    6. Understanding color attributes and functions
      4m 16s
    7. Exploring color spaces
      7m 44s
    8. Using color palettes
      7m 5s
    9. Transforming the grid
      8m 38s
    10. Exploring the attribute matrix
      5m 33s
  7. 52m 7s
    1. Building code blocks
      5m 57s
    2. Writing a while loop
      3m 52s
    3. Using for loops
      5m 35s
    4. Creating conditionals
      14m 50s
    5. Working with easing
      10m 51s
    6. Creating spirals
      11m 2s
  8. 18m 55s
    1. Mouse tracking
      3m 54s
    2. Hovering and clicking
      11m 16s
    3. Understanding keyboard interaction
      3m 45s
  9. 27m 32s
    1. Specifying fonts
      6m 43s
    2. Using images
      5m 51s
    3. Playing a video loop
      6m 20s
    4. Exporting video
      3m 47s
    5. Adding sound
      4m 51s
  10. 20m 49s
    1. Creating functions
      11m 48s
    2. Creating classes and objects
      9m 1s
  11. 31m 10s
    1. Using embedded data
      5m 26s
    2. Working with appended text data
      6m 4s
    3. Working with appended tabular data
      10m 26s
    4. Reading XML data
      9m 14s
  12. 48m 17s
    1. Generating dot plots
      11m 11s
    2. Building scatter plots
      10m 0s
    3. Making line plots
      9m 55s
    4. Creating bar charts
      9m 12s
    5. Checking out examples of maps, hierarchies, and networks
      7m 59s
  13. 20m 57s
    1. Introducing some principles of 2D design
      13m 44s
    2. Understanding color theory
      7m 13s
  14. 24m 46s
    1. Interacting with zooming, rotating, and sliding
      6m 26s
    2. Implementing slicing
      6m 47s
    3. Using rollovers
      5m 58s
    4. Introducing the GUI libraries
      5m 35s
  15. 10m 35s
    1. Sharing via OpenProcessing and other sites
      3m 19s
    2. Saving as a desktop application
      2m 42s
    3. Saving as JavaScript
      1m 47s
    4. Saving as an Android application
      2m 47s
  16. 2m 38s
    1. Where to go from here
      2m 38s

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