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Interactive Data Visualization with Processing
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Drawing triangles


From:

Interactive Data Visualization with Processing

with Barton Poulson

Video: Drawing triangles

The last primitive shape that we're going to use in Processing is a triangle. And what you see is that the triangle function is very similar to the quadrangle we just did. All it is, is that you specify three sets of X and Y coordinates, one pair for each of the three corners on the triangle. So the first thing I'm going to do is add the name of my file in a comment, and I'll set the size of the window, I'm doing 600 wide 200 tall, turn on the anti-aliasing and then change the background color.
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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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Interactive Data Visualization with Processing
7h 43m Beginner Sep 25, 2012

Viewers: in countries Watching now:

Start communicating ideas and diagramming data in a more interactive way. In this course, author Barton Poulson shows how to read, map, and illustrate data with Processing, an open-source drawing and development environment. On top of a solid introduction to Processing itself, this course investigates methods for obtaining and preparing data, designing for data visualization, and building an interactive experience out of a design. When your visualization is complete, explore the options for sharing your work, whether uploading it to specialized websites, embedding the visualizations in your own web pages, or even creating a desktop or Android app for your work.

Topics include:
  • Exploring the need for creative data visualization
  • Drawing basic lines and shapes
  • Introducing variables, strings, and arrays
  • Modifying drawing attributes such as color
  • Making drawings more dynamic with animation loops and spirals
  • Creating keyboard- and mouse-based interactions
  • Adding images, video, and sound
  • Reading in text or XML data
  • Creating plots and charts
  • Publishing and sharing your work
Subjects:
Developer Programming Languages
Software:
Processing
Author:
Barton Poulson

Drawing triangles

The last primitive shape that we're going to use in Processing is a triangle. And what you see is that the triangle function is very similar to the quadrangle we just did. All it is, is that you specify three sets of X and Y coordinates, one pair for each of the three corners on the triangle. So the first thing I'm going to do is add the name of my file in a comment, and I'll set the size of the window, I'm doing 600 wide 200 tall, turn on the anti-aliasing and then change the background color.

I'm actually going to use a dark gray color for this one. I am using hexadecimal code, you could also use numbers on the 0 to 255 scales for these, but this is just a more compact way of doing it. And then I'm going to give a 5 pixel width to the borders by using the strokeWeight function. And then all I need to do is call triangle, this one has no abbreviation, it's just triangle and I put in three pairs of X, Y coordinates.

So in this case I'll go 150 and 50, 200 and 150, 100, and 150, Save it and Run. And there is my default triangle with the white fill and the black border. All right. Then, again like with quadrangles, there are no special modes for doing this, you always have to specify the three pairs of X, Y coordinates. But you can change strokeWeights, you can change fills and border colors, and so on. So this one, I'm going to turn off the border using noStroke and then I'm going to change the fill, I can use the hex code here again.

It is just going to be 74AD92, it's a greenish color and then I call the triangle function, 250 and 50, 300 and 150, 350 and 50, this will make at upside down triangle compared to the other one. Save it and Run it and there we go. And then, again, to follow along the pattern we had before, I'll just make a third one, this time with noFill, but with a different border.

So I'm going to put on stroke, so this will draw a border, and I'm going to make it sort of an orangish color by using F07F47, those are the RGB, close that one and then I'm going to turn off the fill, then call the triangle function, and put in the 3 coordinates 450 and 50, 500 and 150, 400 and 150. Let's Save it and then Run it.

Now I have my three triangles, so again, this is the final primitive shape that we will be using in Processing, but you can see how it would be useful as a building block in more elaborate and larger scale drawings.

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