#!/usr/bin/perl -w # # Copyright 2000 by Michael Coyle # Released under GPL. # # Call it with: # [an error occurred while processing this directive] # # Get the file name from the browser... $file_name = $ENV{'QUERY_STRING'}; # Open the file... open (EP, $file_name); # Print to the browser... print "Content-Type: text/html \n\n"; # Load the file and keep spitting it out to the browser... while () { chomp; print "$_ "; } # Close the file and go home... close EP #!/usr/bin/perl -w # # Copyright 2000 by Michael Coyle # Released under GPL. # # Call it with: # [an error occurred while processing this directive] # # Get the file name from the browser... $file_name = $ENV{'QUERY_STRING'}; # Open the file... open (EP, $file_name); # Print to the browser... print "Content-Type: text/html \n\n"; # Load the file and keep spitting it out to the browser... while () { chomp; print "$_ "; } # Close the file and go home... close EP

3D
3D Photo Gallery (Part 1)
3D Photo Gallery (Part 2)

Audio
Poor Man's MIDI
Make A Metronome
iPod Tricks (Part 1)
iPod Tricks (Part 2)
iPod Tricks (Part 3)
Laugh Track Machine
Audio Player with Reverb
Shepard Melody
RB Phone Home
Build a Drum Machine

Custom Controls and Windows
Double Click Listbox
Draggable Metal Window
Double Click Canvas
Custom Buttons
Custom Buttons Part II
iTunes-style Listboxes
Custom Controls


General RB
Scrolling Windows
Using Mesage Dialogs
Case-Sensitive Word Finder
Introduction to Stacks
Wiggle Window
JPEG in PDF
Listbox Checkboxes
Background Applications
Listbox Auto-Find
Virtual Volumes
Time Tracker
Software Distribution (Part 1)
Software Distribution (Part 2)
Software Distribution (Part 3)
Software Distribution (Part 4)
Exceptions
Tips and Tricks
Text Clippings Made Easy

Graphics
Drawing a Simple Gradient
The SpriteSurface: Space Game
Image Spinner
Cropping Graphics (Part 1)
Cropping Graphics (Part 2)
Cropping Graphics (Part 3)
Cropping Graphics (Part 4)
Shimmer Graphics
Lissajous Figures
Simple Screen Capture
Vector Graphics
Kaleidoscope Images
Stegonography
Spirals!
Image Table
RB Magnifying Lens
Screen Capture
Color Picker Tutorial

Hacks
Ghost Grab
Speedy Mouse Extension
iTunes Plugins
iTunes Skinner

Mac OS X
Global Hot Key Event (Carbon Events)
Login Welcomer (Carbon Events)
Add/Remove Buttons
Resizable Sheets
Mac OS X Preferences Window
Using Sheets in REALbasic
Build a Bundle (Part 1)
Build a Bundle (Part 2)
Dock Your Passwords
Mac OS X Debugging
REALbasic Mac OS X Icon Tutorial
Animate Your Dock
RB and the Command Line

Menus
Window Menu
Templates Menu
Listbox Menu

Novelty
Guessing Game
Calendar Trivia
Tile Mixer
Zip Code Finder
Happy Valentine's Day
Merlin Simulator (Part 1)
Merlin Simulator (Part 2)
Merlin Simulator (Part 3)
Buzzword Machine
AppleSoft BASIC

Printing
Print to PDF

Registration
Registration Code Validation
Network Registration Codes

Resources
Picture Extractor (Part 1)
Picture Extractor (Part 2)

Serial
Caller ID (Part 1)
Caller ID (Part 2)
Caller ID (Part 3)

Speech
Speech Recognition

Socket Communication
Easy Peer-to-Peer File Sharing
MacPAD Version Checking
Display Web Image In Canvas
HTML IMG Tags
Version Tracking
Even Smarter Instant Messaging
Web Tiler
JavaScript and REALbasic
Stock Ticker (Part I)
Stock Ticker (Part 2)
AIM Mate

XML Manipulation
Simple XML Introduction

Video
Big Brother Video Capture

Note: All articles without a byline were written by Erick Tejkowski. When cleaning the site I removed them because the code differed from page to page, and I have yet to put them back in.

resexc2.gif (20k)




REALbasic for Dummies
by Erick Tejkowski

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Image Spinner
04-11-03




One of the most frequently asked questions among REALbasic lists is "How do I rotate an image?" This week we'll show you how to quickly and easily rotate an image in realtime. The REALbasic Group2D class simplifies matters significantly for us. By dragging a few items to your interface and adding a bit of code, you'll be spinning in no time.

Build the Interface
Launch REALbasic and add a Canvas, a PushButton, and a Slider control to the Window1 interface. Set the maximum value of the slider to 6283. Since one complete rotation around a circle is approximately 6.283 radians, we'll use the larger value of 6283 to insure fine resolution upon rotation. Next, click on the slider to select it and uncheck its Enabled property in the Properties window. Then, add an image file to your project. I snagged a photo of Michael Coyle, ResEx' own top dog. His image accompanies the source code download at the end of this tutorial. The final interface looks like this:

4-11-03_img1.jpg (18k)

Add the Code
Double-click PushButton1 and add the following code to its Action event.

  Dim px as PixmapShape
  Dim p as Picture
  
  px=New PixmapShape(coyle)
  p=New Picture(coyle.width,coyle.height,32)
  d=New Group2D
  d.append(px)
  Canvas1.Backdrop=p
  Canvas1.backdrop.Objects=d
  canvas1.Refresh 
  slider1.enabled = TRUE

Next, add this code to the Paint event of Canvas1.

  g.clearRect 0,0,me.width,me.height
  g.drawobject d,47,60

With the Window1 code editor opened, create a new property of that window, by choosing Edit-New Property. Name the property like this: d as Group2D

4-11-03_img2.jpg (18k)

Conclusion
Choose Debug-Run to see your work. By drawing an image using a Group2D object, you can a number of important image operations. The speed isn't as fast as an RGBSurface, but for many tasks its perfectly suitable. You can download the completed project for this week here. See you next week!






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#!/usr/bin/perl -w # # Copyright 2000 by Michael Coyle # Released under GPL. # # Call it with: # [an error occurred while processing this directive] # # Get the file name from the browser... $file_name = $ENV{'QUERY_STRING'}; # Open the file... open (EP, $file_name); # Print to the browser... print "Content-Type: text/html \n\n"; # Load the file and keep spitting it out to the browser... while () { chomp; print "$_ "; } # Close the file and go home... close EP #!/usr/bin/perl -w # # Copyright 2000 by Michael Coyle # Released under GPL. # # Call it with: # [an error occurred while processing this directive] # # Get the file name from the browser... $file_name = $ENV{'QUERY_STRING'}; # Open the file... open (EP, $file_name); # Print to the browser... print "Content-Type: text/html \n\n"; # Load the file and keep spitting it out to the browser... while () { chomp; print "$_ "; } # Close the file and go home... close EP