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Drawing points

From: Interactive Data Visualization with Processing

Video: Drawing points

In this next movie we're going to start looking at the seven primitive shapes, or basic geometrical shapes, that Processing can draw. The most basic one of these is a simple point in a field. What I'm going to do is I'm first going to put a comma (,) to give the name of this particular sketch. I do the two slashes (//) and you can see when I started typing that we got a section sign at the end of the name of the file on the tab that indicates that they are unsaved changes. If I just do Ctrl+S to Save on a PC or Cmd+S on a Mac, now it goes away because I'm saved.

Drawing points

In this next movie we're going to start looking at the seven primitive shapes, or basic geometrical shapes, that Processing can draw. The most basic one of these is a simple point in a field. What I'm going to do is I'm first going to put a comma (,) to give the name of this particular sketch. I do the two slashes (//) and you can see when I started typing that we got a section sign at the end of the name of the file on the tab that indicates that they are unsaved changes. If I just do Ctrl+S to Save on a PC or Cmd+S on a Mac, now it goes away because I'm saved.

So, what I'm going to do right now is I'm going to draw a point. The first thing I'm going to do is set the size of the sketch display window. For most of the sketches in this course, I'll be using a window that is 600 pixels wide and 200 pixels tall, this is an arbitrary choice; it's just the one that seems to work nicely. So, what I do is I type size for the function, and then in parenthesis I put the dimensions 600 pixels wide and 200 pixels tall, close the parenthesis, and then put a semicolon (;) to end the function. And so right now, I could Run this sketch, Ctrl+R on a PC, Cmd+R on a Mac and I'll get my window that's 600 pixels wide and 200 pixels tall.

I'm also going to turn on anti-aliasing, this is something I do on every sketch and that's just smooth with the open and closing parenthesis (), because there are no arguments for this function. But, it does have to have that space and a closing semicolon (;). Now, what I'm going to do is I'm going to drawn a number of points and all I need for a point is an x, y coordinate. The first point is going to be 100 pixels over and 100 pixels down. I'm going to draw a several more and I'm going to put them 50 pixels away from each other.

I'm just going to copy and paste to do this. And then I'll change these manually and when I draw it, this is what you'll see, is a series of very, very small points. Now, they are small, because they are points. And, in fact, given the compression that we used, you may not be able to see them at all. In fact, what I'm going to do is change it to make it so you can see them better. When I close this sketch, and I'm going to make a couple of changes; Number one is, actually I'm going to change the color of the background.

I'd like to use something else. In this particular case, I'm going to type in background and I'm going to be using a background with a hex code. Hex codes are hexadecimal numbers and they are another way of indicating color codes. It's still the RGB Red, Green, Blue system and its' still on an 8-bit 0 to 255. But, it represents it in a different way that's a little more compact. And we have to do is first type the pound sign (#). And then you type the 6-letter number code that you're going to use.

Now, this one is going to be 666666, so now you see when I draw it, it's a darker gray. Then what I'm going to do is I'm going to change the color for the dots themselves. I'm going to change this by using the Stroke command. Now, if this were a circle or a square, I would use the Fill command. But, a point is just a point that theoretically doesn't have a Fill in it, it's just an outline of itself. The way I do this is I type in stroke, all lowercase, and then I'm going to use the hex command for the color that I'm using.

In this case, I'm using 607F9C. In case you wonder, I am consulting an external file with the palettes that I've put together earlier. Also, to make this so you can actually see these points, I'm going to increase their size substantially, and the way I can do that is by using strokeWeight. And this is where we get into the issue of Bumpy Caps or Camel Caps. And what we have here is that the functions almost always start with lowercase letters. But, if you want to distinguish words in them, you can then go to capitalization.

So, strokeWeight is the name of that function. And then in parentheses () I'm going to put the number of pixels that I want each of these points to be. I'm going to pick 20 pixels; close the parenthesis and a semicolon. Then I'm going to Save the file and Run it by hitting Ctrl+R on a PC or Cmd+R on a Mac. And now, what you see is a collection of points that are now large enough to be circles against a darker gray background. So, this is the very first primitive geometric shape that we deal with in Processing, is this simple point.

And this will serve as an excellent starting point for the other sketches that we'll be working with in the rest of the movies.

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This video is part of

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

72 video lessons · 12109 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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