The goal for this project is to observe the skeleton code and understand the functions well enough to meet the project objectives listed at the top of this page. Look at the different functions to divulge information about how this graphics library works and revise the code to meet expectations.
Once you are in your class folder you can make a directory for this project using:
mkdir gtf0
After entering the directory you can retrieve the project files like so:
grabit DESIG gtf0
Where DESIG is your class designation (e.g. cprog).
mkdir -p ~/public_html
chmod 0711 ~/public_html
make gtf0
It is also possible to compile manually as such:
gcc -Wall --std=gnu18 -o gtf0 gtf0.c -lgd
gcc is the name of the compiler or collection of compilers used to compile C/C++ code. It can be invoked with the gcc command with flags such as what is shown above.
To run the program you've modified/created, simply invoke it on the command line while in its directory like so:
./gtf0
You should now notice gtf0.png in the directory that you ran the program.
From here, you can move it to your public_html directory for viewing.
mv gtf0.png ~/public_html
chmod 0644 ~/public_html/gtf0.png
int color = gdImageColorAllocate (gdImagePtr im, int r, int g, int b);
gdImagePtr im is the image the function edits
int r, int g, and int b are the red, green, and blue components of the color. Typically represented as hex values between 0x00 and 0xFF
There are many ways to find a colors hex value, including google's
gdImageLine (image, x1, y1, x2, y2, color);
x1 and y1 are the starting coordinates and x2 and y2 are the ending coordinates
gdImageRectangle (gdImagePtr im, int x1, int y1, int x2, int y2, int color);
gdImagePtr im is the image the function edits
int x1 is the left bound
int y1 is the upper bound
int x2 is the right bound
int y2 is the lower bound
int color is the color the rectangle is drawn as
gdImageFill (gdImagePtr im, int x, int y, int color);
gdImagePtr im is the image the function edits
int x and int y are the coordinates the fill propagates from
int color is the color that is drawn as
gdImageFilledRectangle (gdImagePtr im, int x1, int y1, int x2, int y2, int color);
gdImagePtr im is the image the function edits
int x1 is the left bound
int y1 is the upper bound
int x2 is the right bound
int y2 is the lower bound
int color is the color the rectangle is drawn as
gdImageEllipse (gdImagePtr im, int mx, int my, int w, int h, int color);
gdImagePtr im is the image the function edits
int mx and int my is the coordinates of the circle center
int w is the horizontal diameter of the circle
int h is the vertical diameter of the circle
w and h must be the same to create a circle
int color is the color the circle is drawn as
gdImageEllipse (gdImagePtr im, int mx, int my, int w, int h, int color);
gdImagePtr im is the image the function edits
int mx and int my is the coordinates of the ellipse center
int w is the horizontal diameter of the ellipse
int h is the vertical diameter of the ellipse
int color is the color the ellipse is drawn as
