2D Sketchpad

University Project: Design and Implement an interactive 2D drawing application. Focuses on implementations of low-level algorithms like Bresenham’s line drawing and scanline fill. Developed on Windows platform, written in C++ using Win32 GDI.

FEATURES:
  • Scanline fill produces all concave and convex polygons, with or without interior holes. The algorithm does not fail in any special case.
  • Lines drawn with Bresenham’s midpoint line algorithm.
  • Circles drawn with Bresenham’s midpoint circle algorithm and 8 way symmetry.
  • Guidelines displayed when drawing polygons, lines, or any shapes.
TOOLS:
  • Clear canvas function
Varying thickness/colour:
  • Freehand pencil tool
  • Freehand eraser tool
  • Line drawing tool
Filled/unfilled, with various border thicknesses and different forecolours and backcolours:
  • Circles
  • Rectangles
  • User drawn polygons

Background colour also applies to any eraser lines.

Illustration of scanline algorithm's lack of special cases.