Paint-Windows

Knowledge base

The core concept of the processing is to draw graphic objects

Technical details

• Design patterns: Singleton, Factory, Abstract factory, prototype
• Plugin architecture
• Delegate & event

Core requirements (5 points)

• Dynamically load all graphic objects that can be drawn from external DLL files

• The user can choose which object to draw

• The user can see the preview of the object they want to draw

• The user can finish the drawing preview and their change becomes permanent with previously drawn objects

• The list of drawn objects can be saved and loaded again for continuing later

  You must save in your own defined binary format

• Save and load all drawn objects as an image in bmp/png/jpg format (rasterization). Just one format is fine. No need to save in all three formats.

Basic graphic objects

• Line: controlled by two points, the starting point, and the endpoint
• Rectangle: controlled by two points, the left top point, and the right bottom point
• Ellipse: controlled by two points, the left top point, and the right bottom point

Improvements (Choose and propose as you wish)

• Allow the user to change the color, pen width, stroke type (dash, dot, dash dot dot..._

• Adding text to the list of drawable objects

• Adding image to the canvas

• Reduce flickering when drawing preview by using buffer to redraw all the canvas

  Upgrade: Only redraw the needed region, no fullscreen redraw

• Adding Layers support

• Select a single element for editing again

  Transforming horizontally and vertically

  Rotate the image

  Drag & Drop

• Zooming

• Cut / Copy / Paste

• Undo, Redo

• Fill color by boundaries

• Anything that you think is suitable