Rasterinha

Rasterinha is a Computer Graphics project: a 2D rasterizer.

Requirements

• git
• yaml-cpp

Usage

You will need to install yaml-cpp library. Run the command:

bash ./install-yaml-cpp-locally.sh 

If you already have the yaml-cpp installed you will need to modify the CMakeLists.txt to link to your library and include files. To compile:

git clone https://github.com/JoMedeiros/cg-draw.git
mkdir build && cd build
cmake ..
make

Run the program with:

./cg-draw <image_name> 

Where <image_name> is a path to a image descriptor in yaml format.

yaml image format

Here's an example of image description:

width: 800
height: 600
colors:
  white: [255,255,255]
objects:
  line: {x1: 100, y1: 100, x2: 300, y2: 300}
  circle: {cx: 400, cy: 300, r:200}

First we have width and height of the image in pixels. Then we have a table of colors. Each color in colors is described as an array of three integers. Finally the objects to be drawn. Each object can be:

Line

The arguments are x1 and y1 the initial point and x2 and y2 the end point. stroke is the color (defined in colors table or in format [r,g,b]) of the line.

Circle

The arguments are cx and cy the center point and r the radius. stroke is the color (defined in colors table or in format [r,g,b]) of the line.

Polyline

  polyline: {points: [100, 10, 
                      40, 198, 
                      190, 78, 
                      10, 78, 
                      160, 198], stroke: my_green}

points is a list of points in order to be connected.

stroke is the color (defined in colors table or in format [r,g,b]) of the line.

Polygon

  polyline: {points: [100, 10, 
                      40, 198, 
                      190, 78, 
                      10, 78, 
                      160, 198], stroke: my_green}

points is a list of points in order to be connected (it will close the polygon connecting the last and the first points).

stroke is the color (defined in colors table or in format [r,g,b]) of the line.

fill is the color (defined in colors table or in format [r,g,b]) to fill the polygon.

alpha is the fill transparancy.

Third party libraries

• yaml-cpp: a library to parse yaml files