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Interactive Data Visualization with Processing
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Drawing rectangles and squares


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Interactive Data Visualization with Processing

with Barton Poulson

Video: Drawing rectangles and squares

The next primitive shape that we're going to work with in Processing is squares or more appropriately, rectangles, because just as with circles, Processing doesn't have a built-in function for squares, when it is as rectangles where you draw the same width and height, but let's take a look at this one, this function is pretty easy to deal with. The first thing I'm going to do, I'm going to create a comment with my file name then I'll set the size of the window, turn on anti-aliasing then I'll put a background, it'll be a sort of a light yellowish 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 rectangles and squares

The next primitive shape that we're going to work with in Processing is squares or more appropriately, rectangles, because just as with circles, Processing doesn't have a built-in function for squares, when it is as rectangles where you draw the same width and height, but let's take a look at this one, this function is pretty easy to deal with. The first thing I'm going to do, I'm going to create a comment with my file name then I'll set the size of the window, turn on anti-aliasing then I'll put a background, it'll be a sort of a light yellowish color.

I'm going to use the hex codes again and when I save that you can see there's our background. Now I'm going to start drawing some squares and the way I do this is with rect for rectangle and it draws it from the top left corner. So what I need to do is I need to set the coordinates for the top left, in this case I'll use 60 pixels over, 60 pixels down and then you specify the width and the height of the rectangle, I'll do it 80 and 80.

Now just so you know, there are choices for this, this is what called the rectMode, in fact, I can just type it out right here. This is rectMode CORNER, I want to just mention that that is the default, so I don't actually have to type it, but it means it places it by the top left corner and you specify the width and height. The other options are to specify the center point and the width and the height or to specify the coordinates for the top left corner and the bottom right corner and I'll show you both of those in just a moment. But right now I'm just going to draw this rectangle.

I hit Run and there's my basic rectangle with a white fill black border, and I actually like to make the boarder a little bit thicker, so I'm going to close that and I'm going to come back here and put in strokeWeight, all lowercase, except for the capital W, I need to do bumpy caps, because that's the way the functions worked in here and I'll make it 5 pixels. Now when I Save it and Run it, it's a little bit thicker that works a little better for me, so I'm going to close out. Now I'm going to draw two other rectangles. To show you that there are different ways to draw these, I'm going to use rectMode CENTER, and again, sometimes it's easier to position things by the center and makes it also consistent with what happens with circles and some of the other shapes.

Sometimes it's easier to position it by the top left; it depends on the situation you're working with. So, this time I do a rect and then I have to specify that I'm going 300 pixels over and I'm going to 100 pixels down. Now notice in the one before I was 60 pixels down with an 80 pixel box, so halfway through that will actually be a hundred. So you'll see that these two line up actually, and I'll make this one 80 pixels wide and 80 pixels tall and I'm also going to just a little variety, I'm going to turn off the outlines with noStroke and I'll put in a fill using the hex code CC5C54, it's a sort of a red.

I'll Save that and Run it and now you can see that there are aligned, even though I specified very different dimensions, because the first one is positioned by the top left corner, the second one positioned by it's center point, but you do a little math so you can get them to line up. Then I'm going to do one more to show you the third way of drawing a rectangle. This one is rectMode CORNERS, please note it has an S, it make it different from the CORNER above, because what I'm specify now is coordinates for two of the corners. Now I'll change this one to make it a look a little bit different, so I'll give it an outline, use my hex codes, it'll be a slightly lighter orangish color and I'm going to turn off the fill.

Then I'm going to position the rectangle. This time I go to the top left corner, so that's 460 and 60, so you can see they are parallel with the very first one I did. But now instead of specifying and the width and the height of the rectangle, I simply go to the coordinates for the bottom right corner in this case 540 and 140, 540 pixels over from the top left, and then 140 pixels down. I Save it and Run and now you see the sequence of three squares all drawn with the rectangle function and positioned in different ways, the left one using the default corner, which I give the coordinates for the top left coordinate, and then I give the width and height.

The middle one is using center, where I specify the X and Y coordinates for the center of the box, along with its width and height. And the one on the right positioned using CORNERS, where I simply give the X and Y coordinates for the top left corner and the bottom right corner, and that's it, for drawing rectangles and squares in Processing.

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