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 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.
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The tutorial emulates a Cocoa project available from Apple. As we progress through the project each week, we'll add various features to match the original example. So, go check out the original example and come back here ready for some REALbasic coding. NOTE: This demo is made with OS X in mind. Build the Interface  You should also add a 256 x 256 image to your REALbasic project. If you don't have an image, one accompanies the project download at the end of this tutorial. It is named scenery. Add the Code
To initialize the two Picture objects, add the following code to the Open event of Canvas1: pictureSrc = newpicture(canvas1.width,canvas1.height,32) Next, enter this code in the MouseDown event of Canvas1 to begin a click-and-drag operation: startX = X Then, add this code to the MouseDrag event of Canvas1 to track the drag operation: dim g as graphics Next, we'll need to handle the MouseUp event of Canvas1. This code takes care of copying the selection from the source image to the destination image, which will appear in Canvas2. dim g,gg as graphics To draw the image in Canvas1, add this code to the Paint event of Canvas1: g.drawpicture pictureSrc,0,0 Finally, to draw in Canvas2, add this code to its Paint event: g.forecolor=rgb(255,255,255) That's it! Choose Debug-Run to test your work. 
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