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Working with the bitmap data class

From: Flash CS3 Professional Beyond the Basics

Video: Working with the bitmap data class

Throughout the rest of this chapter we're going to look at applying a reflection to a video. The first thing we'll talk about is using something called the bitmap data class. If you're following along, I'm working in 05_BitmapData.fla in the Chapter 08 folder in the Exercise Files folder. Let's take a look at how this file is set up. There are four layers: actions, video, BG, and BBg. The BG and BBg layers contain background graphics. The actions layer does not yet contain the ActionScript and the video layer contains a movie clip. If I select it on the stage, I can see it's an instance of video_mc, and if I double-click that movie clip to enter its timeline I could see that the movie clip is an instance of the FLV Playback component.

Working with the bitmap data class

Throughout the rest of this chapter we're going to look at applying a reflection to a video. The first thing we'll talk about is using something called the bitmap data class. If you're following along, I'm working in 05_BitmapData.fla in the Chapter 08 folder in the Exercise Files folder. Let's take a look at how this file is set up. There are four layers: actions, video, BG, and BBg. The BG and BBg layers contain background graphics. The actions layer does not yet contain the ActionScript and the video layer contains a movie clip. If I select it on the stage, I can see it's an instance of video_mc, and if I double-click that movie clip to enter its timeline I could see that the movie clip is an instance of the FLV Playback component.

The FLV playback component is used to play progressively downloaded video. If you click the Parameters tag at the bottom of the screen and scroll down to look at the component parameters, you can see that the source video is SB_Skaters2.flv and that's in the same folder as the other Exercise Files in this chapter. So if you're following along and don't have access to the Exercise Files, you'll need to store an FLV file in the same folder as this file. Or you can just use the Video Import Wizard to import a video into the FLV playback component.

Let's click Scene 1 to return to the main timeline. You can test the movie to preview the video by pressing Command+Return on the Mac, or Ctrl+Enter on the PC. And there's a look at our video we'll be working with. So let's close the Preview window. Now we'll select the first keyframe the actions layer and open up the Actions panel by pressing Option+F9 on the Mac or F9 on the PC. The first thing we'll do to create the reflection is work with the bitmap data class. The bitmap data class creates a bitmap image out of pixels. I'll explain how it works as we start typing the code.

So create a variable called videoData with a datatype of BitmapData and we'll it set equal to a new instance of the bitmap data class. When you type open parenthesis for the bitmap data class, the code hinting in Flash tells you to pass in a width integer and a height integer and you can optionally pass in values of transparency or a fill color. What we want to do here is sort of create a copy of the video on the stage. But by using the bitmap data class, we'll create a copy out of the pixel information that's on the screen in the video, rather than creating a copy of the video itself, which could be more processor intensive.

So here for the width of our bitmap data object, I'm going to type the same width as our video. So type video_mc. That's the name of the movie clip that contains the video on the stage. .width, type a comma and a space. We'll type in video_mc.height for the height of our bitmap data object. Make sure to close out the parentheses and type a semicolon to end the statement. Then go to the next line in your code. So now we've created this new bitmap object that's as wide and as high as our video, but how do we tell Flash that this is going to be a copy of our video.

We do that by using the draw method of the bit the data class. So type videoData, captial D, dot draw. Then we need to pass in some sort of object that Flash can draw as a bitmap. And movie clip are one of those objects. So I'm going to pass in video_mc. So with the code that we've written Flash creates this bitmap data object that's the same size as our video on the stage and then gives it all the pixel information that's inside our video_mc movie clip. The next we have to do is connect all of this information held in our bitmap data object to an actual bitmap.

We'll take a look at how to do that in the next movie.

Show transcript

This video is part of

Image for Flash CS3 Professional Beyond the Basics
Flash CS3 Professional Beyond the Basics

79 video lessons · 25619 viewers

Todd Perkins
Author

 
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  1. 3m 30s
    1. Welcome
      1m 20s
    2. Getting the most from this training
      1m 20s
    3. Using the exercise files
      50s
  2. 15m 28s
    1. Managing digital assets
      4m 9s
    2. Creating custom keyboard shortcuts
      5m 1s
    3. Creating custom color swatches
      3m 41s
    4. Creating a custom template
      2m 37s
  3. 14m 38s
    1. Working with variables
      3m 41s
    2. Using functions
      3m 30s
    3. Working with events
      2m 11s
    4. Using event listeners
      2m 42s
    5. Working with arrays
      2m 34s
  4. 29m 41s
    1. Understanding dynamic text fields
      2m 37s
    2. Loading text from an external file
      6m 42s
    3. Reading HTML from a text field
      5m 29s
    4. Applying CSS with ActionScript
      7m 0s
    5. Applying external CSS to a text field
      7m 53s
  5. 45m 27s
    1. Masking dynamic text
      4m 59s
    2. Dragging the Scroll Bar
      7m 3s
    3. Calculating a scroll percent
      5m 20s
    4. Setting scroll boundaries
      4m 9s
    5. Connecting the ScrollBar to the text field
      2m 55s
    6. Easing the text with the ScrollBar
      4m 12s
    7. Scrolling the text with buttons
      2m 38s
    8. Animating the scrolling text with the buttons
      4m 26s
    9. Setting boundaries for the scrolling text
      4m 26s
    10. Easing the text using the buttons
      1m 37s
    11. Connecting the ScrollBar to the Scroll buttons
      3m 42s
  6. 20m 46s
    1. Organizing a complex object into layers
      1m 51s
    2. Duplicating MovieClips
      1m 29s
    3. Undocking the timeline
      1m 20s
    4. Animating a complex MovieClip
      4m 36s
    5. Creating an animated Hinge effect
      5m 13s
    6. Creating complex animations
      6m 17s
  7. 28m 1s
    1. Controlling objects with buttons
      4m 6s
    2. Understanding frame labels
      3m 25s
    3. Using buttons to navigate labeled frames
      2m 30s
    4. Nesting code within MovieClips
      5m 8s
    5. Adding sound to the application
      2m 34s
    6. Adding drag interactivity to the robot
      6m 1s
    7. Animating the dragged robot
      4m 17s
  8. 20m 3s
    1. Understanding components
      2m 30s
    2. Using components to setup a form
      3m 45s
    3. Setting up the form to send an email
      3m 38s
    4. Working with form variables
      6m 11s
    5. Skinning components
      3m 59s
  9. 27m 40s
    1. Using transparency in a video
      4m 16s
    2. Working with embedded video
      3m 38s
    3. Animating a VideoClip
      2m 53s
    4. Creating an advanced animation with video
      2m 40s
    5. Working with the bitmap data class
      3m 37s
    6. Working with the bitmap class
      1m 40s
    7. Copying the video to create a reflection
      1m 35s
    8. Reflecting the video
      2m 42s
    9. Enhancing a video reflection with a mask
      4m 39s
  10. 1h 38m
    1. Viewing the finished MP3 player
      1m 45s
    2. Understanding the project flow
      2m 52s
    3. Preparing to build the MP3 player
      5m 11s
    4. Understanding classes and packages
      5m 32s
    5. Creating the MP3 player class
      9m 59s
    6. Loading sounds from external files
      9m 20s
    7. Accessing ID3 tag information
      6m 11s
    8. Controlling sound playback with Play and Pause buttons
      11m 3s
    9. Changing tracks
      12m 1s
    10. Displaying the current volume
      9m 33s
    11. Changing the volume
      6m 40s
    12. Wiring the progress bar
      8m 4s
    13. Building the progress bar slider
      10m 4s
  11. 5m 36s
    1. Making Flash movies accessible
      1m 49s
    2. Adding a name and description to your Flash movie
      52s
    3. Accessibility and text fields
      2m 55s
  12. 12m 2s
    1. Understanding Flash Mobile
      35s
    2. Exploring Device Central
      1m 45s
    3. Updating Device Profiles
      1m 7s
    4. Creating a Flash file from Device Central
      2m 7s
    5. Creating and testing Flash Lite applications
      2m 48s
    6. Downloading the Flash Lite player for Windows Mobile
      1m 44s
    7. Getting a Flash Lite application onto your phone
      1m 56s
  13. 27s
    1. Goodbye
      27s

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