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Interactive Data Visualization with Processing
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Drawing simple curves


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Interactive Data Visualization with Processing

with Barton Poulson

Video: Drawing simple curves

In this next movie we're going to show you how to draw curves using a series of vertices in Processing this actually allows for some really interesting effects and drawings and it be pretty useful I think. The way this one begins is, we set the drawing up and by doing what I've done in the other ones, I have first put the name of the drawing and I put the size of the window turn on the anti-aliasing, I'm going to set a background color, a rather neutral one C3CCC8.
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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 simple curves

In this next movie we're going to show you how to draw curves using a series of vertices in Processing this actually allows for some really interesting effects and drawings and it be pretty useful I think. The way this one begins is, we set the drawing up and by doing what I've done in the other ones, I have first put the name of the drawing and I put the size of the window turn on the anti-aliasing, I'm going to set a background color, a rather neutral one C3CCC8.

And if I just check that, there we go a little gray green. Then I'll put in a strokeWeight of 5 pixels, so that make lines and borders 5 pixels thick. Then what I do is I'm going to color the strokes; I'm going to draw three different curves on this one. The first one is going to make a dark brown color and here is how the curve function works. What it is, is it has four pairs of coordinates.

Now the first two are the coordinates for what's called the starting control point and this is something that doesn't draw, it has to do with sort of a lever action on the curve. The second pair of coordinates are for the start of the curve proper; the third pair are for the finish of the curve; and the fourth pair are for the nonprinting invisible control point, again sort of a lever function. And you'll see how these things work. So I'm going to call it curve and then I'm going to type in four sets of coordinates. The first one, the control point would be a 100 and 300.

Then I'll do the beginning of the curve at 100 and 100, then I'll do the end of the curve at 200 and 100 and then the finishing control point will be at 200 and 300. So eight numbers to get four pairs of coordinates. Again, two represent the beginning and the end of the curve and the other two represent the control points which have an influence on the shape of the curve. In fact if I save that and run it, you'll see my curve right there just a little upward curve. You'll also see that it has the default white fill.

Again, like arcs, Processing hesitancy to feel things in even when you didn't expect it to and so you have to deliberately turn off the fill in the curve to get rid of that. The way you do that is by coming down and typing in noFill. So we'll make another curve now and this I will just make a different color, I'll call the stroke and B9961C. And then what I'm also going to do is change something called the curve tightness parameter and this is something that lets you really do some interesting manipulations of the curve separate from the control points.

This is really one that works best to just play around with it for a while and see how it affects the curves that you're making. So I'm giving this one a value of positive 3 that can be positive or negative usually not terribly far from the zero then I'm going to draw the curve; curve 250, 300, 250, 100, 350, 100, 350, 300. And so what you can see is that the coordinates here are the same as the first curve except I've shifted them to the right a 150 pixels, but you'll see because of the curve tightness it gets a very different result.

So I'm going to Save and Run and in fact you see it's flipped around in the other direction and it's starting to curve around itself making an oval. And then I'll make one more curve with a different tightness parameter. I'll just copy all of this; give this one a different color to distinguish it, to 475D1C. And instead of having a curve tightness of positive 3 and I'll give this one a negative 3. Now the default tightness is actually, I believe is one, and so you'll see it's not symmetrical around zero even though I have positive 3, negative 3 the effects are going to be rather different.

And this one I'm just going to move over another 150. So I just take the Xes on each of these and I make them this one to 400, 400, this one will be 500 and so this one you see. So again the coordinates are the same just shift it over 150 pixels to the right I'm going to Save it and Run it and look what we got. Now it's a dramatically different shape, you see for instance that it goes in the opposite direction the sides of it are nearly straight with a very strong peak as opposed to the bowl shaped one that we have in the middle and the default shape meaning default for using the X and Y coordinates of the endpoint and the control points.

And so a lot of interesting things you can do with curves and we will explore some of possibilities later in this course.

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