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Real-world example: CanvasMol

From: HTML5: Graphics and Animation with Canvas

Video: Real-world example: CanvasMol

Before we get into working with canvas in the rest of the course, let's take a look at some of the real-world examples that people have built using canvas to achieve effects and drawing operations that used to require native plug-ins like Silverlight and Flash but can now be done using modern browsers and HTML5. This example is called canvasMol. It's on a web site called alteredqualia.com. Basically, this shows how canvas can be used to model molecules on a drawing surface.

Real-world example: CanvasMol

Before we get into working with canvas in the rest of the course, let's take a look at some of the real-world examples that people have built using canvas to achieve effects and drawing operations that used to require native plug-ins like Silverlight and Flash but can now be done using modern browsers and HTML5. This example is called canvasMol. It's on a web site called alteredqualia.com. Basically, this shows how canvas can be used to model molecules on a drawing surface.

So let's take a look at some ones. Here's one of my favorite ones; here's Caffeine. So you can see that what's happening here is when I click on a molecule over here in this list, this canvas drawing surface pops up and it shows me the molecule for that particular item. In this case, this is the caffeine molecule. I can use the mouse to grab this thing and move it around. And I can choose some other ones. Here's one, Fructose, another one of my favorites. So you can see now I bring up another canvas, the frame rate slows down a little bit because this drawing is happening in real time, and the more canvases you have on the drawing surface, the more processing power it takes.

So let's add another one little one. Let's add Lycopene, and then we can scroll down and see that. That's a pretty fairly complex molecule, but you get the idea here. What's happening is the canvas is being used to render each one of these molecular bonds with individual atoms. You can see that they're all shaded a certain way, and they're rotating. Each one of the canvases responds to the mouse. And we can add one more over here from the list. Let's go ahead and add Penicillin. So I can just go ahead and add each one of these in succession, and what's happening is a new little window is being popped up with the canvas inside of it.

And you can see that each one of the canvases is now drawing each molecule rotating in real time. Each one responds to the mouse. You can see that as I add more canvases, the drawing rate slows a little bit, but not very much; it's still highly usable. Each one is still also pretty responsive. So this is a really great example of something that would've probably required a plug-in in the past but is now just happening natively using canvas in HTML5.

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This video is part of

Image for HTML5: Graphics and Animation with Canvas
HTML5: Graphics and Animation with Canvas

37 video lessons · 18153 viewers

Joe Marini
Author

 
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  1. 4m 54s
    1. Welcome
      1m 3s
    2. Using the exercise files
      2m 3s
    3. Using the HTML5 Canvas element in the real world
      1m 48s
  2. 10m 31s
    1. Real-world example: CanvasMol
      2m 9s
    2. Real-world example: Raphaël-JavaScript Library
      1m 47s
    3. Real-world example: The Wilderness Downtown
      4m 1s
    4. Real-world example: Sketchpad
      1m 10s
    5. Real-world example: Pirates Love Daisies
      1m 24s
  3. 3m 28s
    1. Installing the tools
      1m 29s
    2. Exploring the Canvas examples used in this course
      1m 59s
  4. 8m 58s
    1. Introducing the Canvas tag
      6m 30s
    2. Understanding the differences between Canvas and SVG
      2m 28s
  5. 5m 36s
    1. Identifying the Canvas element's methods and properties
      1m 40s
    2. Using the Canvas drawing context
      3m 56s
  6. 43m 14s
    1. Setting and using colors and styles
      3m 19s
    2. Drawing basic shapes: Rectangles and lines
      10m 21s
    3. Understanding the Canvas state
      5m 15s
    4. Drawing complex shapes: Arcs and paths
      9m 15s
    5. Drawing complex shapes: Bézier and quadratic curves
      5m 46s
    6. Rendering text
      9m 18s
  7. 32m 35s
    1. Creating shadows
      6m 41s
    2. Drawing with patterns
      7m 20s
    3. Drawing with gradients
      6m 18s
    4. Using clipping paths
      4m 46s
    5. Drawing images and video
      7m 30s
  8. 35m 42s
    1. Transforming objects using the translate tag
      4m 18s
    2. Scaling objects with the scale transformation
      4m 7s
    3. Rotating objects with the rotate transformation
      4m 33s
    4. Applying a custom transformation
      6m 58s
    5. Compositing in Canvas using globalAlpha
      6m 36s
    6. Manipulating raw pixels
      9m 10s
  9. 41m 23s
    1. Building an image slideshow control
      4m 24s
    2. Using smooth transitions in a slideshow
      4m 28s
    3. Creating a basic animation
      5m 42s
    4. Creating animation with double buffering
      13m 13s
    5. Incorporating Canvas into a real page
      13m 36s
  10. 48s
    1. Goodbye
      48s

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