DrawPile

DrawPile is a drawing program that allows sharing the canvas with other users in real time. It facilitates collaborative drawing sessions where multiple people can work on the same canvas simultaneously. The software includes functions for recording sessions, basic animation, and support for graphics tablets.

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• Collaborative session. Multiple users can connect to the same canvas and draw simultaneously. Each participant sees the strokes of others in real time, with immediate synchronization of all changes made to the shared canvas.
• Integrated server. The program includes an integrated server to host drawing sessions without requiring additional software. It also allows connection to dedicated servers for larger or permanent sessions.
• Session recording. Ability to record all actions performed during a drawing session in DPCS format. Recordings can be played back later to review the creative process or exported to video formats.
• Animation support. Functionality to create animated sequences using layers and timelines. Allows setting keyframes and controlling the exposure of each layer on the timeline.
• Layer system. Implementation of multiple layers with blend modes for advanced composition. Includes independent text layers and layer groups for work organization.
• Sensitive tablets. Full compatibility with Wacom tablets and other pressure-sensitive devices. Detects and applies pressure sensitivity to brushes and drawing tools.
• Integrated chat. Text messaging system within the program for communication between participants. Allows coordination during collaborative sessions without leaving the interface.
• OpenRaster format. Ability to import and export files in ORA format, preserving layers and project structure. Interoperability with other graphics programs that support this format.
• Secure connections. Implementation of SSL encryption to protect drawing sessions. Ensures communication between clients and server remains confidential.
• Port forwarding. Automatic port forwarding configuration via UPnP to facilitate connections. Eliminates the need for manual router configuration in most cases.
• Selection and transformation. Rectangular and freehand lasso selection tools with transformation capabilities. Includes interpolation modes for scaling and rotation of selected elements.
• Stroke stabilizer. Mechanism to smooth strokes using stabilization algorithms. Reduces hand tremor and produces cleaner lines in freehand drawing.
• Customizable brushes. Configurable brush system with size, opacity, and spacing settings. Supports MyPaint brushes for compatibility with existing sets.
• Blend modes. Implementation of standard layer blend modes in digital graphics. Includes multiply, screen, overlay, and other composition modes.
• Configurable interface. Modular interface design with docking of panels in customizable positions. Users can rearrange elements according to their workflow.

DrawPile was initially created by Calle Laakkonen. Development began around 2010 as a personal project. The program is primarily written in C++ using the Qt framework for the graphical interface. Over the years, multiple contributors have added to the code base. The application has evolved from a basic collaborative drawing tool into software with advanced animation and editing features.

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