Basic Animation with Object Pascal (Beginner Tutorial)
In this kid-friendly tutorial, we build a bouncing ball animation in Object Pascal using the Lazarus IDE on Linux. You’ll learn how GUI apps update over time with a Timer, how to move shapes on a form, and how to make the ball bounce off the window edges—all in under 10 minutes.
🎯 What you’ll learn
Add and configure GUI components: TShape (circle) and TTimer
Change properties (color, width/height, position) and captions
Write an OnTimer event to update position every few ms
Use form coordinates (Top, Left, Width, Height, ClientHeight, ClientWidth)
Implement edge collisions (reverse direction at boundaries)
Control animation speed (timer interval vs. pixels per tick)
Keep state with private fields (e.g., moving up/right booleans)
Who it’s for
OWL Scholars, kids learning to code, teachers, and beginners curious about Pascal + Lazarus on Linux.
🧰 Prereqs
You watched “Build Your First Pascal GUI” (button + textbox + message)
Basic comfort with variables, conditionals, and events
⏱️ Chapters
00:00 Intro & goal (animate a shape)
00:40 New Lazarus Application (GUI template)
01:10 Add TShape (circle, size, color)
01:55 Add TTimer (20 ms → animation frames)
02:30 Create Timer1Timer event
03:00 Move the ball vertically (Top ±= step)
04:10 Bounce at top/bottom (ClientHeight run check)
05:30 Tune speed (interval vs. step size)
06:20 Add horizontal movement (Left ±= step)
07:10 Bounce at left/right (ClientWidth run check)
08:15 Resize the window — animation still works
08:45 Save project structure (new folder per GUI app)
09:05 What’s next: GUI Guessing Game
🎒 Try this (Homework)
Add a speed slider (1–10) that changes step size live
Randomize start direction and ball color on run
Show a hit counter label (how many wall bounces)
Add a Pause/Play button (enable/disable Timer1)
Spawn a second ball with its own direction flags
🏷️ Tags / Hashtags
#LazarusIDE #FreePascal #ObjectPascal #PascalProgramming #GUIProgramming #Animation #TTimer #TShape #KidsWhoCode #BeginnerProgramming #OpenWiseLearning #STEMEducation #LinuxCoding #FedoraLinux
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