Table of Contents

Corning Community College

CSCS1320 C/C++ Programming

PROJECT: Graphics To Figure-out (GTF0)

OBJECTIVE

As we start our journey into programming, despite not yet having learned much, let us see how our observational and pattern-matching and problem solving skills can still yield productive changes toward the solution of a task.

TASK

You are to modify provided code, once functionality and operations of it are understood, to produce, as image output, a scene containing the following characteristics:

EDIT

You will want to go here to edit and fill in the various sections of the document:

GTF0

GRABIT

The first step towards completing the project is to get the skeleton code and Makefile Lab46 has a command you can run called grabit, it can be used by typing the command, followed by the course designation, followed by the project in this case it would be

 grabit cprog gtf0 

REPOSITORY STEPS

BUILD THE CODE

Edit the provided skeletal code from the grabit using a txt editor like nano. edit this code to fit the criteria for the project

RUN THE PROGRAM

To be able to run the gtf0.c file use the following command in the grabit file:

make debug

Issue the command ls -l and if there is a green “gft0” file, everything worked :) {for now}

If you execute this command it should produce a .png image

VIEW THE IMAGE

The image can either be viewed, if on a Pi, from the GUI file explorer

Or if in lab46: 1. Copy the file to ~/public_html/

username@lab46:~/src/spring2024/gtf0$ cp ./gft0.png ~/public_html

2. Change current directory to ~/public_html

cd ~/public_html

3. Change permissions to be able to be read by all

chmod +r gtf0.png

4.view image from web browser

https://lab46.g7n.org/~username/gtf0.png

LIBGD FUNCTIONALITY

MIXING A COLOR

You can make custom colors in C with commands from the libgd library so do this specify the integer variable that will have the color assigned to it

int black = 0;

then using the gdImageColorAllocate command, specify the intensity of each color, red green and blue, and reassign the output to the color

                         image  red   green blue
black = gdColorAllocate (image, 0x00, 0x00, 0x00);

red green blue sections are in hexcode so the most intense value is 0xFF and the least being 0x00

so if red and blue = 0xFF

and green = 0x00

you will get purple

DRAWING A LINE

Syntax for drawing a graphics line

gdImageFill (image, x1, y1, x2, y2, color);
DRAWING A RECTANGLE

Syntax for drawing a graphics line

gdImageRectangle (image, topleftX, topleftY, bottomrightX, bottomrightY, colorofRectlines)
FILLING AN ENCLOSED SPACE

Basically the Fill bucket from any drawing software. You specify where the coordinates of the fill is (another way of thinking is that the coordinates is specifying where the “click” of the paint bucket tool would be on the screen) and all space within enclosed lines around the coord's get flooded with the specified color

gdImageFill (image, x1, y1, color);
DRAWING A FILLED RECTANGLE

Syntax for drawing a graphics line

gdImageFilledRectangle (image, topleftX, topleftY, bottomrightX, bottomrightY, color)

This will draw a solid rectangle of color

DRAWING A CIRCLE

Syntax for a circle uses an arc command but the start angle is 0° and the end is 360° (also the diameters are equal)

Arc syntax:

gdImageArc (image, centerX, centerY, diameterWidth, diameterHeight, start°, end°, colorofLine);

Circle Ex:

gdImageArc (image 150, 300, 100, 100, 0, 360, black);
DRAWING AN ELLIPSE

Syntax for an Ellipse

gdImageEllipse ( X1, Y2, width, height, colorofLine);

(could also be used for a circle)

Syntax for an Filled Ellipse

gdImageFilledEllipse ( X1, Y2, width, height, colorofFill);
 

SUBMISSION

To be successful in this project, the following criteria (or their equivalent) must be met:

Submit Tool Usage

Let's say you have completed work on the project, and are ready to submit, you would do the following:

lab46:~/src/SEMESTER/DESIG/PROJECT$ submit DESIG PROJECT file1 file2 file3 ... fileN

You should get some sort of confirmation indicating successful submission if all went according to plan. If not, check for typos and or locational mismatches.

RUBRIC

I'll be evaluating the project based on the following criteria:

26:gtf0:final tally of results (26/26)
*:gtf0:modified code appropriately to accomplish task [16/16]
*:gtf0:commented code adequately to describe process [8/8]
*:gtf0:removed unused code [2/2]

Pertaining to the collaborative authoring of project documentation

Additionally