https://github.com/kujenga/curves

a vector graphics editor for multiple types of curves
https://github.com/kujenga/curves

Last synced: 2 months ago
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a vector graphics editor for multiple types of curves

• Host: GitHub
• URL: https://github.com/kujenga/curves
• Owner: kujenga
• License: mit
• Created: 2014-10-05T13:16:16.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2015-04-15T13:40:17.000Z (about 10 years ago)
• Last Synced: 2025-01-24T12:45:40.723Z (4 months ago)
• Language: C++
• Homepage:
• Size: 270 KB
• Stars: 2
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Curves

### a simple vector graphics editor in C++

uses deprecated versions of GLUT and OpenGL

to draw various line geometries in the 2d plane.

## Implementation details

I pursed the implementation of this project a bit differently from the specifications on the original assignment. Rather than sticking to the stateless, key-press based control scheme, I decided to create a staeful manager for the application as well as a wondw manager in order to play around with things such as buttons and tool bars in a way similar to the implementation I have seen in actual systems.

All the key-based controls and changes in state are handled by the ToolWindow class.Curves for the application and other application-wide state information is encapsulated by the StateManager class. The Mindow Manager keeps a stack of Windows that it draws iteratively on each idle of the application (it would be more efficient to implement a polling-based redrawing rather than forcing it to happen on every call to on-idle). Views are transformed to fit their origin and scale and are drawn by windows that encapsulate them.

## Class Structure

- WindowManager

    - handles maintaining the window stack and passing glut function calls to the window stack

- StateManager

    - keeps track of the various application states that need to be accessed across multiple pieces of the application

    - also will keep track of the curves in the application currently

- Window

    - superclass of all the windows, contains functionality to transform the contents to fit within the origin and scale

    - contains virtual function definitions for the methods which handle GLUT events coming from the WindowManager

    - DrawWindow

        - displays the curves and lines held by the state manager, allows for their editing by interfacing with the methods on the curves

    - ToolWindow

        - displays the various tools available within the application

        - modifies application state on button clicks

- View

    - superclass of all the various views within the application

    - provides bounding functionality based on origin and scale values

    - ToolView

        - is associated with a `ToolType` value and displays its associated text representation

- Curve

    - pure virtual superclass of all curves, provides basic drawing functionality based on virtual methods

    - Freeform

        - virtual superclass of all the curves that contain control points

## Scoring

### Points

55 pts for a D,

65 pts for a C,

75 pts for a B,

85 pts for an A.

### Scoring metrics

- Select control points through clicks. [5 pts]

- Object at the mouse cursor becomes selected if clicked. [15 pts if this works approximately, (*) 25 pts if this works exactly]

    - implement line clipping, and clip objects to a small window around the cursor (knowledge-hungry student's way)

    - use OpenGL selection mode (OpenGL expert way)

- Support Catmull-Clark subdivision curves, created by clicking control points while holding key 'C'. [20 pts]

- Support Catmull-Rom splines, created by clicking control points while holding key 'R'. [25 pts]

- Support cubic Hermite interpolation splines. Derivatives at control points should be manually editable. Extra controls should be displayed to allow the user to adjust derivatives. [(*) 35 pts]

- Support dragging control points of the selected curve. [10 pts]

- When an object is selected, pressing the 'F' key to fill it. [5 pts if it works for convex shapes, (*) 20 pts if it works for non-self-intersecting curves, (*) 25 points if it works for any curve]

- Display the current number of curves in the corner using Bezier curves to form the numbers (steal control points from http://jackf.net/bezier-clock/) [20 pts]