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--- haas:fall2020:cprog:projects:cos0 [2020/10/19 09:17] – [Submission] wedge
+++ haas:fall2020:cprog:projects:cos0 [2020/10/19 16:13] – [getting started] wedge
@@ Line 53: / Line 53: @@
 Now, gd has functions for drawing circles. You are **NOT** to use them for this project. As I said, this is a circle //of squares//. As such, you will be making use of the **gdImageFilledRectangle()** function.
-====getting started====
-You may make use of the following skeleton program to assist you in doing this project.
-Note that this code is not in conformance with project specifications, but is provided to give you a starting place for modifications and additions:
-<code c>
-/*
- * cos0.c   - skeleton code to use the GD graphics library
- *                        to create an image (circle of squares).
- *
- * To compile: type 'make' to compile the program
- *         or: gcc --std=c99 -Wall -o cos0 cos0.c -lgd
- * To execute: ./cos0 ARGS
- *
- * Documentation:  http://www.boutell.com/gd/manual2.0.33.html
- *                 https://libgd.github.io/manuals/2.1.1/index/Functions.html
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <gd.h>
-// color values
-//
-#define BLACK       0
-#define BLUE        1
-#define GREEN       2
-#define RED         3
-#define WHITE       4
-int main(int argc, char **argv)
-{
-        //////////////////////////////////////////////////////////////////
-        //
-        // Declare variables
-        //
-        char               *outfile;    // name out of the output file
-        FILE               *out;        // output file pointer
-        gdImagePtr          img;        // GD Image Construct
-        unsigned int        color[5];   // color array
-        unsigned short int  wide, high; // image attributes
-        //////////////////////////////////////////////////////////////////
-        //
-        // Check arguments
-        //
-        if (argc     == 2)
-        {
-                outfile   = *(argv+1);
-                fprintf(stdout, "Using '%s' as output filename\n", outfile);
-        }
-        else
-        {
-                outfile   = (char *) malloc (sizeof(char) * 64);
-                sprintf(outfile, "/home/%s/public_html/cos0.png", getenv("USER"));
-        }
-        //////////////////////////////////////////////////////////////////
-        //
-        // image dimensions
-        //
-        wide          = 600;
-        high          = 800;
-        //////////////////////////////////////////////////////////////////
-        //
-        // Create new image of specified wide-ness and high-ness
-        //
-        img           = gdImageCreate(wide, high);
-        //////////////////////////////////////////////////////////////////
-        //
-        // Some GD color definitions
-        //
-        color[BLACK]  = gdImageColorAllocate(img, 0x00, 0x00, 0x00);
-        color[BLUE]   = gdImageColorAllocate(img, 0x00, 0x00, 0xFF);
-        color[GREEN]  = gdImageColorAllocate(img, 0x00, 0xFF, 0x00);
-        color[RED]    = gdImageColorAllocate(img, 0xFF, 0x00, 0x00);
-        color[WHITE]  = gdImageColorAllocate(img, 0xFF, 0xFF, 0xFF);
-        //////////////////////////////////////////////////////////////////
-        //
-        // Paint the background black
-        //
-        gdImageFilledRectangle(img, 0, 0, wide-1, high-1, color[BLACK]);
-    /****************************************************************
-     *                                                              *
-     *  =============>  YOUR CODE/PROGRAM GOES HERE  <============  *
-     *                                                              *
-     ****************************************************************/
-        //////////////////////////////////////////////////////////////////
-        //
-        // Open the file
-        //
-        out           = fopen(outfile, "wb");
-        if(out       == NULL)
-        {
-                fprintf(stderr, "Error opening '%s'\n", outfile);
-                exit(1);
-        }
-        //////////////////////////////////////////////////////////////////
-        //
-        // Set sane file permissions on image file
-        //
-        chmod (outfile, 0644);
-        //////////////////////////////////////////////////////////////////
-        //
-        // Send image to file
-        //
-        gdImagePngEx(img, out, -1);
-        //////////////////////////////////////////////////////////////////
-        //
-        // Close things up
-        //
-        fclose(out);
-        gdImageDestroy(img);
-        return(0);
-}
-</code>
-=====How to view your image=====
-When you have a functioning project and want to view the images generated, you need to make sure they are deployed into your **public_html/** directory.
-To view your image in a web browser, simply point it at the following URL:
-  * <nowiki>https://lab46.g7n.org/~USERNAME/IMAGE.png</nowiki>
-... where "USERNAME" is your lab46 username (in lowercase), and "IMAGE" is the name of your png file (likely also in lowercase, such as 'cos0').
-Note that the tilde just prior to your username in the URL is critical and necessary.
 =====Grabit Integration=====
@@ Line 203: / Line 66: @@
 make: Leaving directory '/var/public/SEMESTER/cprog/cos0'
 lab46:~/src/cprog$ cd cos0
-lab46:~/src/cprog/pos0$ ls
+lab46:~/src/cprog/cos0$ ls
 Makefile  cos0.c
-lab46:~/src/cprog/pos0$
+lab46:~/src/cprog/cos0$
 </cli>
@@ Line 218: / Line 81: @@
 NOTE: You do NOT want to do this on a populated **cos0** project directory-- it will overwrite files. Only do this on an empty directory.
+=====How to view the picture=====
+Depending on your computing setup, choose the most practical means of viewing your program's image output:
+====Raspberry Pi desktop====
+You've got a monitor and keyboard hooked up to your pi that you are using (preferred method for class).
+Open a file browser, web browser, or image viewer and navigate to/open up your **cos0.png** image in your **~/src/desig/cos0/** directory.
+Rinse and repeat as you go through revisions.
+====Raspberry Pi command-line via SSH/MOSH====
+You don't have a monitor, so you are logging into your pi remotely (doable, and good intra-system practice)
+We start by running a successfully-compiled **cos0**:
+<cli>
+yourpi:~/src/desig/cos0$ ./cos0
+</cli>
+... which will produce an image (**cos0.png**); You want to put this in your web space (with the proper permissions set), so you can view it in a web browser:
+<cli>
+yourpi:~/src/desig/cos0$ scp lob0.png yourusername@lab46.g7n.org:public_html/
+</cli>
+Note that you will be prompted for your lab46 password.
+Then over on lab46, run this:
+<cli>
+lab46:~$ chmod 0644 ~/public_html/cos0.png
+</cli>
+Then, point a web browser at the following URL:
+  * https://lab46.g7n.org/~yourusername/con0.png
+NOTE: sometimes the web browser caches previous results, you may have to refresh a few times on revisions to get changes to manifest.
 =====Submission=====
 To successfully complete this project, the following criteria must be met: