DEV Community

Arda Kazancı
Arda Kazancı

Posted on

Creating an Interactive User Interface with Dynamic Lines Jetpack Compose

Creating an Interactive User Interface with Dynamic Lines: Exploring DraggableLineDrawing in Jetpack Compose

Jetpack Compose offers Android app developers a wide range of possibilities for creating modern and interactive user interfaces. Today, we will explore how to use Jetpack Compose to manage complex user interactions with an example called DraggableLineDrawing.

Overview of the Code

The DraggableLineDrawing function creates a series of buttons that users can drag around, interconnected with dynamic lines. When these buttons are clicked, an explosion effect is triggered. Here are the main components of this function:

  1. Initial State of Buttons: The initial position and explosion state of each button are managed using mutableStateOf and mutableStateListOf. This aligns with Compose's reactive architecture, keeping track of the UI's current state.

  2. Line Drawing: Inside a Canvas, lines are dynamically drawn between buttons based on a specific distance condition. These lines update dynamically according to the current positions of the buttons.

  3. Button and Explosion Effect: Each button is drawn as a circle. In the explosion state, small circles scattered around the button create a visual explosion effect.

Detailed Examination of DraggableLineDrawing Function

This function contains a Canvas and a series of DraggableButtonDrawing components within a Box:

  • Positioning and Updating Buttons: Buttons are created with random initial positions on the screen and can be dragged by the user to update their positions.

  • Dynamically Drawing Lines: Lines are drawn between two buttons when the distance between them falls below a set threshold, providing a dynamic response to user interactions.

  • Explosion Effect: When a button is clicked, it "explodes," scattering colored circles around it.

Details of the DraggableButtonDrawing Function

The DraggableButtonDrawing function creates the visual representation of each button:

  • Button Drawing: Each button is drawn as a circle filled with a specified color.

  • Explosion Animation: On clicking the button, small circles are randomly scattered around the button to create an explosion effect.

Visual and Interaction Aspects of the User Interface

This application offers a rich user experience with color transitions, animations, and interactive drawings. Users can change the behavior of the application in real-time by dragging the buttons and clicking on them.


The DraggableLineDrawing application excellently demonstrates the flexibility and power provided by Jetpack Compose. It clearly shows how mathematical calculations and customizable drawing processes can be used to create dynamic UI elements that respond to user interactions. For Android developers, this serves as a valuable example for enriching user experience and creating interactive applications.

This Full Code

My Profile


Top comments (0)