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Mouse tracking

From: Interactive Data Visualization with Processing

Video: Mouse tracking

In this movie, I want to show you a little bit more about how you can use the mouse to create the drawings and to interact with your sketch. This one, after I put a little comment in here with the title in it, is a pretty simple sketch. I'm going to first create my setup block. So I put void setup, and then in curly brackets I'm going to put the size of the window. I'm going to turn on anti-aliasing.

Mouse tracking

In this movie, I want to show you a little bit more about how you can use the mouse to create the drawings and to interact with your sketch. This one, after I put a little comment in here with the title in it, is a pretty simple sketch. I'm going to first create my setup block. So I put void setup, and then in curly brackets I'm going to put the size of the window. I'm going to turn on anti-aliasing.

I'm also going to change the frame rate, because I don't want this one updating too often. I'm going to slow it down just a little bit; maybe I'll put it to 8 frames. This is frames per second. Processing by default will try to run at 60 frames per second, although there are some sketches where that just won't be possible. And then I'm also going to put the background in, and this one I'm going to give a bright white background. So there's my setup. Then I'm going to create my block for draw, do a void draw.

And what I'm going to do here is I'm going to turn off the stroke. So I don't want any outline on the shapes that I'm going to draw. Then I'm going to give a bright-red fill but still not totally red. I am using the RGB codes 220, 0, 0. And I'm going to draw a circle here. And the circle is going to be at the current position of the mouse. So I just put mouseX and mouseY and I make it 10 pixels in diameter.

So I can show you what this one will look like. There we go. So I've got red dots wherever the mouse is, currently. Then what I'm going to do is I'm going to change the fill to a medium-dark gray. That's 120. And again, the way you can tell it's gray is because I only have a single number here in the fill, whereas for the red I have a three numbers, which means that I'm doing an RGB. And then I'm going to draw the ellipse again, except this time I'm going to use a different thing. I'm going to use pmouse, and that is the position of the mouse in the last frame.

And I am going to do that for pmouseX and pmouseY. And so what this is going to do is the mouseX is going to draw this red dot and then this is going to put a gray dot right on top of it, if that is as an old position. And then I'm going to add a line to connect things. I can use the same medium-dark gray. And I'll just put line, and I'm going to connect mouseX and mousey to pmouseX and pmouseY.

Now, please note, the background statement is in setup, which means that the drawing here will not get erased as it goes through. So you'll be able to see every previous thing. The one interesting thing is that the red dots for the current position will be covered up by the gray dots as soon as those are old positions. Otherwise, nothing gets replaced. I'm going to add just one more line of code here, and in case things get a little busy online, I'm going to put a mousePressed command, because this is all about mouse interaction.

And what this says is if any mouse button gets pressed at any point, execute this code, and this one is going to be really simple. All I'm going to do is I'm going to copy that one, the background statement, bring it down to here. And so what this means is if you press the mouse, erase everything with a bright-white background and then just keep doing what you were doing before. So I'm going to save that now, and we're going to run this one. And you can see how it moves around. I am going to press the mouse button, press the mouse button again, and you can see how it just moves around.

And that is a very simple form of the mouse-based interaction.

Show transcript

This video is part of

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

72 video lessons · 13110 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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