Bitmap Drawing

This program was written to get some practice with C memory handling and file writing. The program reads from an input file commands to draw easy shapes (rectangles, circles and triangles) and output a bitmap image containing the drawn shapes.

Compile

Compile using the provided Makefile. Binary will be named "bitmap"

make all

Usage

Call program with following parameters:

bitmap <input-file> <output-file> <image-width> <image-height>

• input-file: path to input file containing the commands (Description of commands see Commands - Input File
• output-file: path to bitmap file which will be created
• image-width: width of the image in pixels
• image-height: height of the image in pixels

Example Usage

./bitmap input.txt output.bmp 640 480

input.txt:

rectangle id="1" color="000033" x="0" y="0" width="640" height="480"
circle id="2" color="ffff00" x="320" y="240" radius="180"
triangle id="3" color="000033" ax="320" ay="240" bx="500" by="300" cx="500" cy="180"

Output:

Commands - Input File

Each line of the file has to contain exactly one shape. Shapes which can be drawn are rectangles, circles and triangles. A line has to begin with 'rectangle', 'circle' or 'triangle' followed by parameters separated by spaces.

Parameters are given as parameter-name="value", for example: color="ffff00"

The coordinate origin is in the left top corner. Coordinates get bigger from left to right and from top to bottom.

Parameters for all shapes:

• id: 32 bit wide positive number, elements with higher ids are drawn in front of
• elements with lower ids
• color: 24 bit rgb value given as hexadecimal number (rrggbb)

Parameters for rectangle:

• x: x coordinate of the left upper corner of the rectangle (in pixel)
• y: y coordinate of the left upper corner of the rectangle (in pixel)
• width: size of rectangle in x direction (in pixel)
• height: size of rectangle in y direction (in pixel)

Parameters for circle:

• x: x coordinate of center of circle (in pixel)
• y: y coordinate of center of circle (in pixel)
• radius: radius of circle (in pixel)

Parameters for triangle:

• ax: x coordinate of point A of triangle
• ay: y coordinate of point A of triangle
• bx: x coordinate of point B of triangle
• by: y coordinate of point B of triangle
• cx: x coordinate of point C of triangle
• cy: y coordinate of point C of triangle

example:

rectangle id="1" color="000033" x="0" y="0" width="640" height="480"
circle id="2" color="ffff00" x="320" y="240" radius="180"
triangle id="3" color="000033" ax="320" ay="240" bx="500" by="300" cx="500" cy="180"